Faraday Effect Measurement of Internal Magnetic Field and Fluctuations in C-MOD

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Faraday Effect Measurement of Internal Magnetic Field and Fluctuations in C-MOD"

Transcription

1 Faraday Effect Measurement of Internal Magnetic Field and Fluctuations in C-MOD William F. Bergerson 1 Coauthors: P. Xu 2, J. H. Irby 2, D. L. Brower 1, W. X. Ding 1, E. S. Marmar 2 1 University of California Los Angeles, Los Angeles, CA, USA 2 Massachusetts Institute of Technology, Cambridge, MA, USA HTPD Monterey, May 2012

2 Motivation Magnetically confined fusion devices require detailed time-resolved measurement of J(r) and B(r): J B = P Measurements of δβ and δj associated with instabilities (MHD, fast-particle modes, turbulence, disruptions) are critical to understanding transport Goal for C-Mod: pursue polarimeter development for both magnetic equilibrium and fluctuation measurements ITER q(r) diagnostic - C-Mod has ITER-like (B, n e ), polarimetry geometry (doublepass) and wavelength (118 µm) 2

3 Outline (1) Measurement principle - Faraday effect ( ) - Cotton-Mouton effect ( ) (2) Key factors for Faraday rotation measurements on high field tokamak - Polarization distortion by optical components - Phase noise (vibrations, stray db/dt, feedback, electronic) - Misalignment to toroidal field (3) Faraday effect measurements - Equilibrium - Fluctuations (4) Future Plans B k B k B k 3

4 Faraday Rotation Polarization rotation due to parallel magnetic field ( B k ) Linearly Polarized EM wave E k E ψ F n e Plasma B z ψ F = λ 2 n e B z dz amplitude measurement Faraday phase shifts are in the 0-30 degree range in C-Mod (118 µm) 4

5 Faraday Rotation Polarization rotation due to parallel magnetic field ( B k ) Linearly Polarized EM wave E L-wave k ψ F E Plasma n e B z R-wave Linearly polarized light can be thought of as the sum of R- and L- waves 5

6 Faraday Rotation (Effect) R- and L- waves are offset in frequency ψ F E Linearly Polarized EM wave E L-wave k Plasma n e B z R-wave ψ F = λ 2 n e B z dz ω c ( n R n L ) 2 dz phase measurement 6

7 Cotton-Mouton Effect Polarization elliptized due to perpendicular magnetic field E Linearly Polarized EM wave E k Plasma n e B ψ CM = λ 3 n e B 2 dz ω c (n X n O )dz 1) C-M phase shifts up to 20 o possible in C-Mod (118 µm) 2) For tokamaks, B has components parallel and perpendicular to the direction of the electromagnetic probe wave 7

8 Faraday Effect Detection Technique λ/2 Plate Reference Mixer Double pass layout, λ~ 118 µm: similar to ITER polarimeter ω 2 ω 1 ω 2 Plasma Retro-reflector mounted in inner wall ω 1 FIR LASERS - (2.54 THz) Frequency offset ~ 4 MHz λ/4 Plate Signal Mixer B p B T Phase Measurement: effect of perpendicular B T on R- and L- waves is identical and cancels, no error due to Cotton-Mouton effect Dodel and Kunz, Infrared Physics 18, (1978). 8

9 FIR Optical Layout Two CW far infrared lasers (Coherent Inc.: λ= µm, ~150 mw/cavity). Frequency offset 4 MHz (<1 µs time response) ~14 m pathlength Not shown: Air-tight enclosures for humidity control 1.2 cm thick magnetic shield for laser stability C-Mod: B T = 3-8T Ip =.4-2.1MA n e = x10 20 m -3 R = 0.68 m a = 0.22 m 9

10 Upper Table Layout chord 1 2 Main components on upper table: 3 - ¼ wave plate ¼λ - TPX lens -> focus beam on corner cube reflector - low-noise planar diode mixers lens - impact parameter: x1=10, x2=16, and x3= 20 cm corner cube retroreflectors 1 2 mirror detector 1 focusing mirror Magnetic axis 10

11 Mesh Beam Splitters May Alter Beam Polarization For an incident angle of 45 0, linearly polarized light may become elliptically polarized AFTER reflection / transmission through beam splitter Effect depends on: 1) Orientation of wire grid with respect to incident beam polarization (drawn) 2) wire grid density (not drawn) -> Both errors minimized in optical layout beam splitter mesh rotated in lower case linearly polarized elliptically polarized 11

12 Polarimeter Calibration Layout Collinear R- and L- polarized beams ω 1 ω 2 Retro-reflector Rotating λ/2 plate causes phase change Rotating λ/2 plate Measured phase difference is linear if polarization of R- and L- waves are not modified by optics (mesh) Signal Mixer 12

13 Measured Phase Response Measured phase (deg) Measured phase (deg) Calibration curves can correct for systematic errors Quartz angle (deg) Linear response: beam is comprised of R- and L- circularly polarized waves Quartz angle (deg) Non-linear response: phase change from optical components 13

14 Measurement Phase Noise deg deg deg Channel 1 Channel 2 Noise floor Channel 3 Acoustically vibrations in lasers: rms (500 khz bandwidth) Magnetic field ramp time (s) vibrations and stray B (db/dt): 1-2 o Error at plasma flattop: Hz - Laser relocation addresses both noise sources - Optical feedback to lasers below noise level 14

15 Toroidal Field Effects: (1) Alignment and (2) Cotton-Mouton effect 1) Misalignment to toroidal field, B T ψ F n e B z dz = n e B P cosα dl + n e B T sinαdl 2) Cotton-Mouton effect ψ CM n e B T 2 dl B P α z C-Mod toroidal magnetic field 4 8T B T Dedicated tests required to determine effect on measured phase shift 15

16 Negligible B T Effect on Faraday Measurement deg ψ F x 1 = 10 cm B t = 7.5 T B t = 5.4 T n e l m 2 Ip (MA) B t (T) time (s) C M effect cancels when using R, L wave approach n e and I p same: change only B T No change in measured phase > No C M effect > No B t effect 16

17 Equilibrium Faraday Effect deg ψ F x 1 = 10 cm measurement EFIT 1 EFIT 2 ψ F deg ψ F x 2 = 16 cm - Experiment and EFIT agree deg x 3 = 20 cm Bme (s) n e l m 2 I p (MA) ψ F Measurements can be used to constrain magnetic equilibrium reconstruction n e B d l 17

18 Plasma Dynamics Captured during Lower Hybrid Current Drive x 1 = 10 cm ψ F n e B d l deg ψ F Faraday signal evolves with LHCD deg ψ F x 2 = 16 cm Indication for J(r) change Lower hybrid power (kw) Further analysis, modeling, and verification ongoing n e l m 2 Time (sec) 18

19 Cotton-Mouton Measurement λ/2 Plate ω 2 Reference Mixer Probe plasma with linear orthogonal light Plasma CCR: Retro-reflector ω 1 FIR LASERS Signal Mixer ψ CM = λ 3 n e B 2 dz ω c (n X n O )dz Fuchs and Hartfuss, PRL 81, (1998) Akiyama, et al., RSI 77, 10F118 (2006) 19

20 Cotton-Mouton Effect Measured deg ψ CM x 1 =10 cm measurement EFIT ψ CM ω c 2 n e B T dz (n X n O )dz deg ψ F x 2 =16 cm measurement EFIT ψ F ω 2c n e B z dz (n R n L )dz n e l m 2 I p (MA) time (s) 1) Cotton-Mouton and Faraday effect measurements consistent with EFIT 2) C-M effect can be used to measure density as B T is known 20

21 Faraday Fluctuation Measurement ψ n e B d l ψ =ψ 0 + δψ n = n 0 + δn B = B 0 + δb δψ = δn e B d l + n e δb d l Term δn e B d l n e δb d l δn e δb Other fluctuation diagnostics aid in differentiating terms in PCI, reflectometer, scattering, interferometer(3 rd laser) external magnetic coils 21

22 Discrete and Broadband Fluctuations in Faraday Signal Coherent feature at khz ~0.2 0 amplitude Broadband feature at khz ~ amplitude time (s) C-Mod polarimeter has time and phase resolution required for fluctuation measurements

23 PCI Energetic Particle driven mode during ICRF khz Freq (khz) T(0) kev Polarimeter Magnetics - Low density shot with 3+ MW ICRF - Spike in activity seen in δn and δb diagnostics - Evidence for Alfvenic activity 23

24 Plans (Three Year Timescale) Locate lasers remotely from tokamak cell [temperature controlled] Lower stray B and acoustic noise (vibration) Use dielectric waveguide to transport beams Increase number of chords from 3 to 10 (depending on access) Horizontal view with one chord below midplane Expand port for radial axis (more chords, δb r ) Add Density measurement capability Exploit Cotton-Mouton effect Add 3rd laser (order on HOLD) magnetic and density fluctuations simultaneously resolved Leverage technique (fluctuation and equilibrium) from C-Mod to address long-pulse AT operations in EAST (preparation for ITER) 24

25 Summary Three chords operational in 12 campaign -> Measurements and EFIT reconstructions consistent Faraday measurement checked against Cotton-Mouton and B t effects -> No contamination found Fluctuations related to MHD, fast-particles instabilities and turbulence observed Future plans to improve laser stability, increase chords Results increase confidence in Faraday effect measurement for ITER 25

26 Table 1: Combined Polarimeter Interferometer Diagnos=c Plasma Parameters Mul5field quan55es Physics Issues Interferometry n o (r,t) n k,ω ( ) Differen0al Interferometry n o (r,t) n k,ω ( ) Polarimetry Faraday Effect 1 J φ (r,t), B θ (r,t) b r ( k,ω), b θ ( k,ω), j φ Collec0ve Sca<ering n ( k,ω) ( k,ω) ElectromagneBc Torque 2 electrons: (Hall Dynamo) ions: j b j b // // en e Charge Flux (Maxwell stress) 3 Γ q = Γ i Γ e = < j // b r > eb ParBcle Flux (divergence) 4 Γ e = j //,e b r eb = V //,e B n b r Momentum Flux (KineBc stress) 5 Γ ion = p //, ionb r B T //, i B n b r Nonlinear 3 Wave Coupling 6 < n e v e,r n e > < n e b r n e > Equilibrium Dynamics Ohm s Law 7 3D effects 8 Momentum Transport Maxwell stress Electric Field GeneraBon Zonal flows ParBcle Transport Momentum Transport Intrinsic flow KineBc stress driving/damping mechanisms for density fluctuabons

27 End of Talk 27

28 Sawtooth Precursors in Faraday Signal T(0) Sawtooth cycle seen x = 16 cm kev deg ψ f sawteeth X = 16cm deg ψ f X = 10cm x = 10 cm chord largely to B p : measures (Wb) δb n e δbdl time (s) 28

29 Impurity Driven Snake and Quasi- Coherent Mode (QCM) Observed arb deg SXR X = 10cm ψ f Snake is long lived core helical perturbation ~ 20 khz, deg arb time (s) X = 10cm ψ f PCI δn e QCM is a common component in ICRF heated plasmas ~ 70 khz,

30 Chords Through or Near the Magnetic Axis Measure δb r Through the magnetic axis, n e B P cosαdl = 0 The residual fluctuation measurement is largely n e δb d l, with δ B δb r because the chord is along the magnetic axis ( term peaks off axis) δn e B d l Topic being considered as a future polarimeter upgrade chord 30

31 Deconstructing Faraday Phase Change Y R + L wave electric field Plasma X Phase difference between R- and L-waves can be measured parallel and perpendicular with respect to toroidal field direction X direction (parallel to toroidal field) is typically selected, but component perpendicular to toroidal field (Y) can also 31 be measured

32 Components of Faraday Rotation degrees degrees degrees X component (toroidal) Y component ( X Y to toroidal) Toroidal component (X) perpendicular component (Y) at 5T and 8T suggests no contaminabon by CM effect L R wave Faraday probe technique is insensibve to CM effect 32 C MOD provides good test due to high field and density

33 Planar-Diode 2.8 THz Mixers Planar Schottky diode technology No fragile whisker contacts Operate interference frequency at 4MHz Bandpass sensitivity up to 1MHz, limited by filters V/W High-Sensitivity and low noise allows access to fluctuation data Diode Mixer Housing 1.5 X 0.75 Horn mm X 0.27mm

34 Key Optical Components Custom mounts -> not easily tunable -> low vibration Thin TPX lens focus beam onto retro reflectors -> 3/16 thick 4 OD -> 85% transmission -> allows for significantly shorter beam path 34

35 Angle of Mesh Grid Can Alter Beam Polarization same line per inch Proper mesh LPI and orientation W.R.T incident beam polarization required to properly split beam for multiple 35 chords without altering polarization

36 Impurity Driven Snake phenomenon Observed Snake is long lived helical perturbation in plasma core Mo +32 presence allows for identification through SXR Snake apparent in chord #1 Faraday data as a oscillation in raw data deg 36

Mo#va#on J B = P. Magne&cally confined fusion devices require detailed &meresolved measurement of J(r) and B(r):

Mo#va#on J B = P. Magne&cally confined fusion devices require detailed &meresolved measurement of J(r) and B(r): Mo#va#on Magne&cally confined fusion devices require detailed &meresolved measurement of J(r) and B(r): J B = P Measurements of δβ and δj associated with instabili&es (MHD, fast par&cle modes, turbulence,

More information

Abstract. Department of Physics. University of Wisconsin UCLA UCLA

Abstract. Department of Physics. University of Wisconsin UCLA UCLA Abstract Internal magnetic field fluctuations and equilibrium poloidal magnetic field have been measured in the MST reversal field pinch by a 11 chord far-infrared polarimeterinterferometer system with

More information

Differential Interferometry for Measurement of Density Fluctuations and Fluctuation Induced Transport

Differential Interferometry for Measurement of Density Fluctuations and Fluctuation Induced Transport Differential Interferometry for Measurement of Density Fluctuations and Fluctuation Induced Transport Liang Lin University of California, Los Angeles, California, USA in collaboration with W. X. Ding,

More information

Density Fluctuation Induced Kinetic Dynamo and Nonlinear Tearing Mode Saturation in the MST Reversed Field Pinch

Density Fluctuation Induced Kinetic Dynamo and Nonlinear Tearing Mode Saturation in the MST Reversed Field Pinch Density Fluctuation Induced Kinetic Dynamo and Nonlinear Tearing Mode Saturation in the MST Reversed Field Pinch W.X.Ding, L. Lin, D.L. Brower, A. Almagri, B. Chapman, G. Fiksel, D.J. Den Hartog, J. Reusch,

More information

Advanced Interferometry Techniques for Burning Plasmas

Advanced Interferometry Techniques for Burning Plasmas Advanced Interferometry Techniques for Burning Plasmas D.L. Brower, W.X. Ding Department of Physics University of California at Los Angeles Los Angeles, California 995-1547 USA V.V. Mirnov Department of

More information

Measurement of lower hybrid waves using microwave scattering technique in Alcator C-Mod

Measurement of lower hybrid waves using microwave scattering technique in Alcator C-Mod Measurement of lower hybrid waves using microwave scattering technique in Alcator C-Mod S. Baek, R. Parker, S. Shiraiwa, A. Dominguez, E. Marmar, G. Wallace, G. J. Kramer* Plasma Science and Fusion Center,

More information

Particle Transport and Edge Dynamo in the MST RFP

Particle Transport and Edge Dynamo in the MST RFP Particle Transport and Edge Dynamo in the ST RFP International RFP Workshop 28 February 2000, adison, WI D. J. Den Hartog Department of Physics University of Wisconsin adison In collaboration with J. K.

More information

DIAGNOSTICS FOR ADVANCED TOKAMAK RESEARCH

DIAGNOSTICS FOR ADVANCED TOKAMAK RESEARCH DIAGNOSTICS FOR ADVANCED TOKAMAK RESEARCH by K.H. Burrell Presented at High Temperature Plasma Diagnostics 2 Conference Tucson, Arizona June 19 22, 2 134 /KHB/wj ROLE OF DIAGNOSTICS IN ADVANCED TOKAMAK

More information

A new scheme for heterodyne polarimetry with high temporal resolution

A new scheme for heterodyne polarimetry with high temporal resolution Plasma Phys. Control. Fusion 38 (1996) 185 1816. Printed in the UK A new scheme for heterodyne polarimetry with high temporal resolution J H Rommers and J Howard FOM Instituut voor Plasmafysica, Association

More information

Studies of Turbulence and Transport in Alcator C- Mod H-Mode Plasmas with Phase Contrast Imaging and Comparisons with GYRO*

Studies of Turbulence and Transport in Alcator C- Mod H-Mode Plasmas with Phase Contrast Imaging and Comparisons with GYRO* Studies of Turbulence and Transport in C- Mod H-Mode Plasmas with Phase Contrast Imaging and Comparisons with GYRO* M. Porkolab 1, L. Lin 1, E.M. Edlund 1, J.C. Rost 1, C.L. Fiore 1, M. Greenwald 1, Y.

More information

Diagnostics for Burning Plasma Physics Studies: A Status Report.

Diagnostics for Burning Plasma Physics Studies: A Status Report. Diagnostics for Burning Plasma Physics Studies: A Status Report. Kenneth M. Young Princeton Plasma Physics Laboratory UFA Workshop on Burning Plasma Science December 11-13 Austin, TX Aspects of Plasma

More information

The Plasma Phase. Chapter 1. An experiment - measure and understand transport processes in a plasma. Chapter 2. An introduction to plasma physics

The Plasma Phase. Chapter 1. An experiment - measure and understand transport processes in a plasma. Chapter 2. An introduction to plasma physics The Plasma Phase Chapter 1. An experiment - measure and understand transport processes in a plasma Three important vugraphs What we have just talked about The diagnostics Chapter 2. An introduction to

More information

Characterization of neo-classical tearing modes in high-performance I- mode plasmas with ICRF mode conversion flow drive on Alcator C-Mod

Characterization of neo-classical tearing modes in high-performance I- mode plasmas with ICRF mode conversion flow drive on Alcator C-Mod 1 EX/P4-22 Characterization of neo-classical tearing modes in high-performance I- mode plasmas with ICRF mode conversion flow drive on Alcator C-Mod Y. Lin, R.S. Granetz, A.E. Hubbard, M.L. Reinke, J.E.

More information

INTERFEROMETER SYSTEMS ON LHD

INTERFEROMETER SYSTEMS ON LHD INTERFEROMETER SYSTEMS ON LHD T. AKIYAMA, a * K. KAWAHATA, a K. TANAKA, a T. TOKUZAWA, a Y. ITO, a S. OKAJIMA, b K. NAKAYAMA, b C. A. MICHAEL, c L. N. VYACHESLAVOV, d A. SANIN, d S. TSUJI-IIO, e and LHD

More information

ICRF Mode Conversion Flow Drive on the Alcator C Mod Tokamak

ICRF Mode Conversion Flow Drive on the Alcator C Mod Tokamak 23 rd IAEA Fusion Energy Conference, EXW/4 1 ICRF Mode Conversion Flow Drive on the Alcator C Mod Tokamak Yijun Lin, J.E. Rice, S.J. Wukitch, M.L. Reinke, M. Greenwald, A. E. Hubbard, E.S. Marmar, Y. Podpaly,

More information

Invessel Calibration of the Alcator C-Mod MSE Diagnostic

Invessel Calibration of the Alcator C-Mod MSE Diagnostic Invessel Calibration of the Alcator C-Mod MSE Diagnostic Steve Scott (PPPL) Howard Yuh, Bob Granetz, Jinseok Ko, Ian Hutchinson (MIT/PSFC) APS/DPP Meeting Savannah, GA November 2004 Introduction Previously,

More information

Observation of Neo-Classical Ion Pinch in the Electric Tokamak*

Observation of Neo-Classical Ion Pinch in the Electric Tokamak* 1 EX/P6-29 Observation of Neo-Classical Ion Pinch in the Electric Tokamak* R. J. Taylor, T. A. Carter, J.-L. Gauvreau, P.-A. Gourdain, A. Grossman, D. J. LaFonteese, D. C. Pace, L. W. Schmitz, A. E. White,

More information

Turbulence Measurements with the Upgraded Phase Contrast Imaging Diagnostic in Alcator C-Mod

Turbulence Measurements with the Upgraded Phase Contrast Imaging Diagnostic in Alcator C-Mod Turbulence Measurements with the Upgraded Phase Contrast Imaging Diagnostic in L. Lin, M. Porkolab, E. M. Edlund, Y. Lin, S. J. Wukitch Plasma Science and Fusion Center, MIT, Cambridge, MA, 02139 48 th

More information

Reduction of Turbulence and Transport in the Alcator C-Mod Tokamak by Dilution of Deuterium Ions with Nitrogen and Neon Injection

Reduction of Turbulence and Transport in the Alcator C-Mod Tokamak by Dilution of Deuterium Ions with Nitrogen and Neon Injection Reduction of Turbulence and Transport in the Alcator C-Mod Tokamak by Dilution of Deuterium Ions with Nitrogen and Neon Injection M. Porkolab, P. C. Ennever, S. G. Baek, E. M. Edlund, J. Hughes, J. E.

More information

Active and Fast Particle Driven Alfvén Eigenmodes in Alcator C-Mod

Active and Fast Particle Driven Alfvén Eigenmodes in Alcator C-Mod Active and Fast Particle Driven Alfvén Eigenmodes in Alcator C-Mod JUST DID IT. J A Snipes, N Basse, C Boswell, E Edlund, A Fasoli #, N N Gorelenkov, R S Granetz, L Lin, Y Lin, R Parker, M Porkolab, J

More information

Active and Passive MHD Spectroscopy on Alcator C-Mod

Active and Passive MHD Spectroscopy on Alcator C-Mod Active and Passive MHD Spectroscopy on Alcator C-Mod J A Snipes, D A Schmittdiel, C Boswell, A Fasoli *, W Burke, R S Granetz, R R Parker, S Sharapov #, R Vieira MIT Plasma Science and Fusion Center, Cambridge,

More information

Study of Enhanced D α H-modes Using the Alcator C-Mod Reflectometer

Study of Enhanced D α H-modes Using the Alcator C-Mod Reflectometer Study of Enhanced D α H-modes Using the Reflectometer Y. Lin 1, J.H. Irby, E.S. Marmar, R. Nazikian, M. Greenwald, A.E. Hubbard, J. Hughes, I.H. Hutchinson, B. LaBombard, A. Mazurenko, E. Nelson-Melby,

More information

Current Drive Experiments in the HIT-II Spherical Tokamak

Current Drive Experiments in the HIT-II Spherical Tokamak Current Drive Experiments in the HIT-II Spherical Tokamak T. R. Jarboe, P. Gu, V. A. Izzo, P. E. Jewell, K. J. McCollam, B. A. Nelson, R. Raman, A. J. Redd, P. E. Sieck, and R. J. Smith, Aerospace & Energetics

More information

Derivation of dynamo current drive in a closed current volume and stable current sustainment in the HIT SI experiment

Derivation of dynamo current drive in a closed current volume and stable current sustainment in the HIT SI experiment Derivation of dynamo current drive and stable current sustainment in the HIT SI experiment 1 Derivation of dynamo current drive in a closed current volume and stable current sustainment in the HIT SI experiment

More information

The Effects of Noise and Time Delay on RWM Feedback System Performance

The Effects of Noise and Time Delay on RWM Feedback System Performance The Effects of Noise and Time Delay on RWM Feedback System Performance O. Katsuro-Hopkins, J. Bialek, G. Navratil (Department of Applied Physics and Applied Mathematics, Columbia University, New York,

More information

Calibration of and Measurements from the C-Mod MSE Diagnostic

Calibration of and Measurements from the C-Mod MSE Diagnostic Calibration of and Measurements from the C-Mod MSE Diagnostic Howard Y. Yuh, MIT Steve D. Scott, PPPL R. Granetz, E.S.Marmar, S.M.Wolfe, D.Beals,MIT W.Rowan, R.Bravenec, M.Sampsell, U.Texas Austin Motional

More information

TRANSPORT PROGRAM C-MOD 5 YEAR REVIEW MAY, 2003 PRESENTED BY MARTIN GREENWALD MIT PLASMA SCIENCE & FUSION CENTER

TRANSPORT PROGRAM C-MOD 5 YEAR REVIEW MAY, 2003 PRESENTED BY MARTIN GREENWALD MIT PLASMA SCIENCE & FUSION CENTER TRANSPORT PROGRAM C-Mod C-MOD 5 YEAR REVIEW MAY, 2003 PRESENTED BY MARTIN GREENWALD MIT PLASMA SCIENCE & FUSION CENTER C-MOD - OPPORTUNITIES AND CHALLENGES Prediction and control are the ultimate goals

More information

C-Mod Core Transport Program. Presented by Martin Greenwald C-Mod PAC Feb. 6-8, 2008 MIT Plasma Science & Fusion Center

C-Mod Core Transport Program. Presented by Martin Greenwald C-Mod PAC Feb. 6-8, 2008 MIT Plasma Science & Fusion Center C-Mod Core Transport Program Presented by Martin Greenwald C-Mod PAC Feb. 6-8, 2008 MIT Plasma Science & Fusion Center Practical Motivations for Transport Research Overall plasma behavior must be robustly

More information

Current Drive Experiments in the Helicity Injected Torus (HIT II)

Current Drive Experiments in the Helicity Injected Torus (HIT II) Current Drive Experiments in the Helicity Injected Torus (HIT II) A. J. Redd, T. R. Jarboe, P. Gu, W. T. Hamp, V. A. Izzo, B. A. Nelson, R. G. O Neill, R. Raman, J. A. Rogers, P. E. Sieck and R. J. Smith

More information

Large Plasma Device (LAPD)

Large Plasma Device (LAPD) Large Plasma Device (LAPD) Over 450 Access ports Computer Controlled Data Acquisition Microwave Interferometers Laser Induced Fluorescence DC Magnetic Field: 0.05-4 kg, variable on axis Highly Ionized

More information

Internal magnetic field measurement in tokamak plasmas using a Zeeman polarimeter

Internal magnetic field measurement in tokamak plasmas using a Zeeman polarimeter PRAMANA cfl Indian Academy of Sciences Vol. 55, Nos 5 & 6 journal of Nov. & Dec. 2000 physics pp. 751 756 Internal magnetic field measurement in tokamak plasmas using a Zeeman polarimeter M JAGADEESHWARI

More information

THE HEAVY ION BEAM PROBE

THE HEAVY ION BEAM PROBE THE HEAVY ION BEAM PROBE CONTENTS Principles of operation Apparatus ions source accelerator beam bending system sweep plates analyzer Sample volumes Space potential Space potential fluctuations Density

More information

Observation of Co- and Counter Rotation Produced by Lower Hybrid Waves in Alcator C-Mod*

Observation of Co- and Counter Rotation Produced by Lower Hybrid Waves in Alcator C-Mod* Observation of Co- and Counter Rotation Produced by Lower Hybrid Waves in Alcator C-Mod* R. R. Parker, Y. Podpaly, J. Lee, M. L. Reinke, J. E. Rice, P.T. Bonoli, O. Meneghini, S. Shiraiwa, G. M. Wallace,

More information

OVERVIEW OF THE ALCATOR C-MOD PROGRAM. IAEA-FEC November, 2004 Alcator Team Presented by Martin Greenwald MIT Plasma Science & Fusion Center

OVERVIEW OF THE ALCATOR C-MOD PROGRAM. IAEA-FEC November, 2004 Alcator Team Presented by Martin Greenwald MIT Plasma Science & Fusion Center OVERVIEW OF THE ALCATOR C-MOD PROGRAM IAEA-FEC November, 2004 Alcator Team Presented by Martin Greenwald MIT Plasma Science & Fusion Center OUTLINE C-Mod is compact, high field, high density, high power

More information

Experimental Investigations of Magnetic Reconnection. J Egedal. MIT, PSFC, Cambridge, MA

Experimental Investigations of Magnetic Reconnection. J Egedal. MIT, PSFC, Cambridge, MA Experimental Investigations of Magnetic Reconnection J Egedal MIT, PSFC, Cambridge, MA Coronal Mass Ejections Movie from NASA s Solar Dynamics Observatory (SDO) Space Weather The Solar Wind affects the

More information

GA A26099 CO2 LASER POLARIMETER FOR FARADAY ROTATION MEASUREMENTS IN THE DIII-D TOKAMAK

GA A26099 CO2 LASER POLARIMETER FOR FARADAY ROTATION MEASUREMENTS IN THE DIII-D TOKAMAK GA A26099 CO2 LASER POLARIMETER FOR FARADAY ROTATION MEASUREMENTS IN THE DIII-D TOKAMAK by M.A. VAN ZEELAND, R.L. BOIVIN, T.N. CARLSTROM, and T.M. DETERLY MAY 2008 DISCLAIMER This report was prepared as

More information

Oscillating Field Current Drive on MST

Oscillating Field Current Drive on MST Oscillating Field Current Drive on MST John Sarff A. Blair, K. McCollam, P. Nonn, J. Anderson, D. Brower 1, D. Craig, B. Deng 1, D. Den Hartog, W. Ding 1, F. Ebrahimi, D. Ennis, G. Fiksel, S. Gangadhara,

More information

Observations of Counter-Current Toroidal Rotation in Alcator C-Mod LHCD Plasmas

Observations of Counter-Current Toroidal Rotation in Alcator C-Mod LHCD Plasmas 1 EX/P5-4 Observations of Counter-Current Toroidal Rotation in Alcator C-Mod LHCD Plasmas J.E. Rice 1), A.C. Ince-Cushman 1), P.T. Bonoli 1), M.J. Greenwald 1), J.W. Hughes 1), R.R. Parker 1), M.L. Reinke

More information

Development of Polarization Interferometer Based on Fourier Transform Spectroscopy for Thomson Scattering Diagnostics

Development of Polarization Interferometer Based on Fourier Transform Spectroscopy for Thomson Scattering Diagnostics 16th International Toki Conference Advanced Imaging and Plasma Diagnostics Ceratopia Toki, Gifu, JAPAN December 5-8, 2006 Development of Polarization Interferometer Based on Fourier Transform Spectroscopy

More information

First Quantification of Electron Thermal Transport in the MST Reversed-Field Pinch

First Quantification of Electron Thermal Transport in the MST Reversed-Field Pinch First Quantification of Electron Thermal Transport in the MST Reversed-Field Pinch Title Abs. TS over. MStFIt j 2kA Te ne Zeff 4kA Te ne Zeff Pohm, W, TauE,beta Xe,D Mot. FIR pola. Monte Carlo Un. An.

More information

Flow measurements in the Scrape-Off Layer of Alcator C-Mod using Impurity Plumes

Flow measurements in the Scrape-Off Layer of Alcator C-Mod using Impurity Plumes Flow measurements in the Scrape-Off Layer of Alcator C-Mod using Impurity Plumes S. Gangadhara,. Laombard M.I.T. Plasma Science and Fusion Center, 175 Albany St., Cambridge, MA 2139 USA Abstract Accurate

More information

Recent results from lower hybrid current drive experiments on Alcator C-Mod

Recent results from lower hybrid current drive experiments on Alcator C-Mod Recent results from lower hybrid current drive experiments on Alcator C-Mod R. R. Parker, S.-G. Baek, C. Lau, Y. Ma, O. Meneghini, R. T. Mumgaard, Y. Podpaly, M. Porkolab, J.E. Rice, A. E. Schmidt, S.

More information

Data analysis and effect corrections of Phase Contrast Imaging diagnostic on HL-2A tokamak

Data analysis and effect corrections of Phase Contrast Imaging diagnostic on HL-2A tokamak SWIP 核工业西南物理研究院 Southwestern Institute of Physics, China Data analysis and effect corrections of Phase Contrast Imaging diagnostic on HL-2A tokamak Y.Yu 1,S.B.Gong 1,2, M.Xu 2,C.J.Xiao 3, W.Jiang 1,W.L.Zhong

More information

Lower Hybrid Wave Induced Rotation on Alcator C-Mod* Ron Parker, Yuri Podpaly, John Rice, Andréa Schmidt

Lower Hybrid Wave Induced Rotation on Alcator C-Mod* Ron Parker, Yuri Podpaly, John Rice, Andréa Schmidt Lower Hybrid Wave Induced Rotation on Alcator C-Mod* Ron Parker, Yuri Podpaly, John Rice, Andréa Schmidt *Work supported by USDoE awards DE-FC-99ER551 and DE-AC-7CH373 Abstract Injection of RF power in

More information

Formation and Long Term Evolution of an Externally Driven Magnetic Island in Rotating Plasmas )

Formation and Long Term Evolution of an Externally Driven Magnetic Island in Rotating Plasmas ) Formation and Long Term Evolution of an Externally Driven Magnetic Island in Rotating Plasmas ) Yasutomo ISHII and Andrei SMOLYAKOV 1) Japan Atomic Energy Agency, Ibaraki 311-0102, Japan 1) University

More information

GA A22722 CENTRAL THOMSON SCATTERING UPGRADE ON DIII D

GA A22722 CENTRAL THOMSON SCATTERING UPGRADE ON DIII D GA A22722 CENTRAL THOMSON SCATTERING UPGRADE ON DIII D by D.G. NILSON, T.N. CARLSTROM, C.L. HSIEH, B.W. STALLARD, and R.E. STOCKDALE NOVEMBER 1997 DISCLAIMER This report was prepared as an account of work

More information

GA A26741 SCINTILLATOR-BASED DIAGNOSTIC FOR FAST ION LOSS MEASUREMENTS ON DIII-D

GA A26741 SCINTILLATOR-BASED DIAGNOSTIC FOR FAST ION LOSS MEASUREMENTS ON DIII-D GA A26741 SCINTILLATOR-BASED DIAGNOSTIC FOR FAST ION LOSS MEASUREMENTS ON DIII-D by R.K. FISHER, D.C. PACE, M. GARCÍA-MUÑOZ, W.W. HEIDBRINK, C.M. MUSCATELLO, M.A. VAN ZEELAND and Y.B. ZHU JUNE 2010 DISCLAIMER

More information

Effects of stellarator transform on sawtooth oscillations in CTH. Jeffrey Herfindal

Effects of stellarator transform on sawtooth oscillations in CTH. Jeffrey Herfindal Effects of stellarator transform on sawtooth oscillations in CTH Jeffrey Herfindal D.A. Ennis, J.D. Hanson, G.J. Hartwell, E.C. Howell, C.A. Johnson, S.F. Knowlton, X. Ma, D.A. Maurer, M.D. Pandya, N.A.

More information

Edge Rotational Shear Requirements for the Edge Harmonic Oscillation in DIII D Quiescent H mode Plasmas

Edge Rotational Shear Requirements for the Edge Harmonic Oscillation in DIII D Quiescent H mode Plasmas Edge Rotational Shear Requirements for the Edge Harmonic Oscillation in DIII D Quiescent H mode Plasmas by T.M. Wilks 1 with A. Garofalo 2, K.H. Burrell 2, Xi. Chen 2, P.H. Diamond 3, Z.B. Guo 3, X. Xu

More information

Destruction of a Magnetic Mirror-Trapped Hot Electron Ring by a shear Alfven Wave

Destruction of a Magnetic Mirror-Trapped Hot Electron Ring by a shear Alfven Wave Destruction of a Magnetic Mirror-Trapped Hot Electron Ring by a shear Alfven Wave Y. Wang 1, W. Gekelman 1, P. Pribyl 1, D. Papadopoulos 2 1 University of California, Los Angeles 2 University of Maryland,

More information

Stationary, High Bootstrap Fraction Plasmas in DIII-D Without Inductive Current Control

Stationary, High Bootstrap Fraction Plasmas in DIII-D Without Inductive Current Control Stationary, High Bootstrap Fraction Plasmas in DIII-D Without Inductive Current Control P. A. Politzer, 1 A. W. Hyatt, 1 T. C. Luce, 1 F. W. Perkins, 4 R. Prater, 1 A. D. Turnbull, 1 D. P. Brennan, 5 J.

More information

Characterization of Edge Stability and Ohmic H-mode in the PEGASUS Toroidal Experiment

Characterization of Edge Stability and Ohmic H-mode in the PEGASUS Toroidal Experiment Characterization of Edge Stability and Ohmic H-mode in the PEGASUS Toroidal Experiment M.W. Bongard, J.L. Barr, M.G. Burke, R.J. Fonck, E.T. Hinson, J.M. Perry, A.J. Redd, D.J. Schlossberg, K.E. Thome

More information

Observation of fishbone-like internal kink modes during LHCD operation in Alcator C-Mod

Observation of fishbone-like internal kink modes during LHCD operation in Alcator C-Mod Observation of fishbone-like internal kink modes during LHCD operation in Alcator C-Mod L. Delgado-Aparicio 1 S. Shiraiwa 2, S. G. Baek 2, L. Sugiyama 3, R. Parker 2, R. Mumgaard 2, R. Granetz 2, I. Faust

More information

A Hybrid Inductive Scenario for a Pulsed- Burn RFP Reactor with Quasi-Steady Current. John Sarff

A Hybrid Inductive Scenario for a Pulsed- Burn RFP Reactor with Quasi-Steady Current. John Sarff A Hybrid Inductive Scenario for a Pulsed- Burn RFP Reactor with Quasi-Steady Current John Sarff 12th IEA RFP Workshop Kyoto Institute of Technology, Kyoto, Japan Mar 26-28, 2007 The RFP fusion development

More information

Flow and dynamo measurements in the HIST double pulsing CHI experiment

Flow and dynamo measurements in the HIST double pulsing CHI experiment Innovative Confinement Concepts (ICC) & US-Japan Compact Torus (CT) Plasma Workshop August 16-19, 211, Seattle, Washington HIST Flow and dynamo measurements in the HIST double pulsing CHI experiment M.

More information

Control of Sawtooth Oscillation Dynamics using Externally Applied Stellarator Transform. Jeffrey Herfindal

Control of Sawtooth Oscillation Dynamics using Externally Applied Stellarator Transform. Jeffrey Herfindal Control of Sawtooth Oscillation Dynamics using Externally Applied Stellarator Transform Jeffrey Herfindal D.A. Ennis, J.D. Hanson, G.J. Hartwell, S.F. Knowlton, X. Ma, D.A. Maurer, M.D. Pandya, N.A. Roberds,

More information

A Motional Stark Effect Instrument to Measure q(r) on C-Mod

A Motional Stark Effect Instrument to Measure q(r) on C-Mod 1 A Motional Stark Effect Instrument to Measure q(r) on C-Mod Presented at the 42nd Annual Meeting of the American Physical Society Division of Plasma Physics, Quebec City, Can., Oct. 2000 N. Bretz, Princeton

More information

EFFECT OF PLASMA FLOWS ON TURBULENT TRANSPORT AND MHD STABILITY*

EFFECT OF PLASMA FLOWS ON TURBULENT TRANSPORT AND MHD STABILITY* EFFECT OF PLASMA FLOWS ON TURBULENT TRANSPORT AND MHD STABILITY* by K.H. BURRELL Presented at the Transport Task Force Meeting Annapolis, Maryland April 3 6, 22 *Work supported by U.S. Department of Energy

More information

Experimental test of the neoclassical theory of poloidal rotation

Experimental test of the neoclassical theory of poloidal rotation Experimental test of the neoclassical theory of poloidal rotation Presented by Wayne Solomon with contributions from K.H. Burrell, R. Andre, L.R. Baylor, R. Budny, P. Gohil, R.J. Groebner, C.T. Holcomb,

More information

Abstract. PEGASUS Toroidal Experiment University of Wisconsin-Madison

Abstract. PEGASUS Toroidal Experiment University of Wisconsin-Madison Abstract Measurement capabilities for the Pegasus ST are increasing to support the scientific studies of plasma behavior at very-low A. Global parameters are obtained from equilibrium reconstructions constrained

More information

channel system which covers both sides of the laser line. Coverage on both sides of the spectrum allows for

channel system which covers both sides of the laser line. Coverage on both sides of the spectrum allows for Large-Area Avalanche Photodiode Detector Array Upgrade for a Ruby-Laser Thomson Scattering System T.M. Biewer, D.J. Den Hartog, D.J. Holly Department of Physics, University of Wisconsin-Madison M.R. Stoneking

More information

The measurement of plasma equilibrium and fluctuations near the plasma edge using a Rogowski probe in the TST-2 spherical tokamak

The measurement of plasma equilibrium and fluctuations near the plasma edge using a Rogowski probe in the TST-2 spherical tokamak The measurement of plasma equilibrium and fluctuations near the plasma edge using a Rogowski probe in the TST-2 spherical tokamak H. Furui, Y. Nagashima 2, A. Ejiri, Y. Takase, N. Tsujii, C. Z. Cheng,

More information

Phase ramping and modulation of reflectometer signals

Phase ramping and modulation of reflectometer signals 4th Intl. Reflectometry Workshop - IRW4, Cadarache, March 22nd - 24th 1999 1 Phase ramping and modulation of reflectometer signals G.D.Conway, D.V.Bartlett, P.E.Stott JET Joint Undertaking, Abingdon, Oxon,

More information

Initial Investigations of H-mode Edge Dynamics in the PEGASUS Toroidal Experiment

Initial Investigations of H-mode Edge Dynamics in the PEGASUS Toroidal Experiment Initial Investigations of H-mode Edge Dynamics in the PEGASUS Toroidal Experiment M.W. Bongard, R.J. Fonck, K.E. Thome, D.S. Thompson 55 th Annual Meeting of the APS Division of Plasma Physics University

More information

Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX

Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX 1 Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX J.M. Canik 1), D.L. Brower 2), C. Deng 2), D.T. Anderson 1), F.S.B. Anderson 1), A.F.

More information

Edge and Internal Transport Barrier Formations in CHS. Identification of Zonal Flows in CHS and JIPPT-IIU

Edge and Internal Transport Barrier Formations in CHS. Identification of Zonal Flows in CHS and JIPPT-IIU Edge and Internal Transport Barrier Formations in CHS S. Okamura, T. Minami, T. Akiyama, T. Oishi, A. Fujisawa, K. Ida, H. Iguchi, M. Isobe, S. Kado, K. Nagaoka, K. Nakamura, S. Nishimura, K. Matsuoka,

More information

Electron temperature barriers in the RFX-mod experiment

Electron temperature barriers in the RFX-mod experiment Electron temperature barriers in the RFX-mod experiment A. Scaggion Consorzio RFX, Padova, Italy Tuesday 5 th October 2010 ADVANCED PHYSICS LESSONS 27/09/2010 07/10/2010 IPP GARCHING JOINT EUROPEAN RESEARCH

More information

Excitation of Alfvén eigenmodes with sub-alfvénic neutral beam ions in JET and DIII-D plasmas

Excitation of Alfvén eigenmodes with sub-alfvénic neutral beam ions in JET and DIII-D plasmas Excitation of Alfvén eigenmodes with sub-alfvénic neutral beam ions in JET and DIII-D plasmas D. Borba 1,9, R. Nazikian 2, B. Alper 3, H.L. Berk 4, A. Boboc 3, R.V. Budny 2, K.H. Burrell 5, M. De Baar

More information

Advanced Tokamak Research in JT-60U and JT-60SA

Advanced Tokamak Research in JT-60U and JT-60SA I-07 Advanced Tokamak Research in and JT-60SA A. Isayama for the JT-60 team 18th International Toki Conference (ITC18) December 9-12, 2008 Ceratopia Toki, Toki Gifu JAPAN Contents Advanced tokamak development

More information

C-Mod Transport Program

C-Mod Transport Program C-Mod Transport Program PAC 2006 Presented by Martin Greenwald MIT Plasma Science & Fusion Center 1/26/2006 Introduction Programmatic Focus Transport is a broad topic so where do we focus? Where C-Mod

More information

UPGRADED CALIBRATIONS OF THE THOMSON SYSTEM AT DIII D

UPGRADED CALIBRATIONS OF THE THOMSON SYSTEM AT DIII D GA A23440 UPGRADED CALIBRATIONS OF THE THOMSON SYSTEM AT DIII D by B. BRAY, C. HSIEH, T.N. CARLSTROM, and C.C. MAKARIOU AUGUST 2000 DISCLAIMER This report was prepared as an account of work sponsored by

More information

Electron Thermal Transport Within Magnetic Islands in the RFP

Electron Thermal Transport Within Magnetic Islands in the RFP Electron Thermal Transport Within Magnetic Islands in the RFP Hillary Stephens University of Wisconsin Madison APS-DPP Meeting November 3, 2009 J.R. Amubel, M.T. Borchardt, D.J. Den Hartog, C.C. Hegna,

More information

Noninductive Formation of Spherical Tokamak at 7 Times the Plasma Cutoff Density by Electron Bernstein Wave Heating and Current Drive on LATE

Noninductive Formation of Spherical Tokamak at 7 Times the Plasma Cutoff Density by Electron Bernstein Wave Heating and Current Drive on LATE 1 EX/P6-18 Noninductive Formation of Spherical Tokamak at 7 Times the Plasma Cutoff Density by Electron Bernstein Wave Heating and Current Drive on LATE M. Uchida, T. Maekawa, H. Tanaka, F. Watanabe, Y.

More information

ELMs and Constraints on the H-Mode Pedestal:

ELMs and Constraints on the H-Mode Pedestal: ELMs and Constraints on the H-Mode Pedestal: A Model Based on Peeling-Ballooning Modes P.B. Snyder, 1 H.R. Wilson, 2 J.R. Ferron, 1 L.L. Lao, 1 A.W. Leonard, 1 D. Mossessian, 3 M. Murakami, 4 T.H. Osborne,

More information

Investigation of Intrinsic Rotation Dependencies in Alcator C-Mod

Investigation of Intrinsic Rotation Dependencies in Alcator C-Mod Investigation of Intrinsic Rotation Dependencies in Alcator C-Mod D. Kwak, A. E. White, J. E. Rice, N. T. Howard, C. Gao, M. L. Reinke, M. Greenwald, C. Angioni, R. M. McDermott, and the C-Mod and ASDEX

More information

Plasma impurity composition in Alcator C-Mod tokamak.

Plasma impurity composition in Alcator C-Mod tokamak. Plasma impurity composition in Alcator C-Mod tokamak. I. O. Bespamyatnov a, W. L. Rowan a, K. T. Liao a, M. Brookman a, M. L. Reinke b, E. S. Marmar b, M. J. Greenwald b a Institute for Fusion Studies,

More information

The details of point source helicity injection as a noninductive startup technique must be characterized:

The details of point source helicity injection as a noninductive startup technique must be characterized: The details of point source helicity injection as a noninductive startup technique must be characterized: Is energy confinement dominated by cross-field transport? Is energy confinement dominated by parallel

More information

2017 US/EU Transport Task Force Workshop April 26 th 2017 Williamsburg, VA

2017 US/EU Transport Task Force Workshop April 26 th 2017 Williamsburg, VA Pablo Rodriguez-Fernandez 1, A. E. White 1, N. M. Cao 1, A. J. Creely 1, M. J. Greenwald 1, N. T. Howard 1, A. E. Hubbard 1, J. W. Hughes 1, J. H. Irby 1, C. C. Petty 2, J. E. Rice 1 1 Plasma Science and

More information

PHY410 Optics Exam #3

PHY410 Optics Exam #3 PHY410 Optics Exam #3 NAME: 1 2 Multiple Choice Section - 5 pts each 1. A continuous He-Ne laser beam (632.8 nm) is chopped, using a spinning aperture, into 500 nanosecond pulses. Compute the resultant

More information

Plasma Science and Fusion Center

Plasma Science and Fusion Center Plasma Science and Fusion Center Turbulence and transport studies in ALCATOR C Mod using Phase Contrast Imaging (PCI) Diagnos@cs and Comparison with TRANSP and Nonlinear Global GYRO Miklos Porkolab (in

More information

A Hall Sensor Array for Internal Current Profile Constraint

A Hall Sensor Array for Internal Current Profile Constraint A Hall Sensor Array for Internal Current Profile Constraint M.W. Bongard, R.J. Fonck, B.T. Lewicki, A.J. Redd University of Wisconsin-Madison 18 th Topical Conference on High-Temperature Plasma Diagnostics

More information

Plasma turbulence measured by fast sweep reflectometry on TORE SUPRA

Plasma turbulence measured by fast sweep reflectometry on TORE SUPRA Plasma turbulence measured by fast sweep reflectometry on TORE SUPRA F. Clairet &, L. Vermare &, S. Heuraux, G. Leclert # & Association Euratom-CEA sur la fusion, DSM/DRFC/SCCP C.E. Cadarache, 8 Saint-Paul-lès-Durance,

More information

Poloidal polarimeter system for current density measurements in ITER

Poloidal polarimeter system for current density measurements in ITER Poloidal polarimeter system for current density measurements in ITER A. J. H. Donné, T. Edlington, E. Joffrin, H. R. Koslowski, C. Nieswand et al. Citation: Rev. Sci. Instrum. 70, 726 (1999); doi: 10.1063/1.1149396

More information

Momentum transport from magnetic reconnection in laboratory an. plasmas. Fatima Ebrahimi

Momentum transport from magnetic reconnection in laboratory an. plasmas. Fatima Ebrahimi Momentum transport from magnetic reconnection in laboratory and astrophysical plasmas Space Science Center - University of New Hampshire collaborators : V. Mirnov, S. Prager, D. Schnack, C. Sovinec Center

More information

Application of atomic data to quantitative analysis of tungsten spectra on EAST tokamak

Application of atomic data to quantitative analysis of tungsten spectra on EAST tokamak Technical Meeting on Uncertainty Assessment and Benchmark Experiments for Atomic and Molecular Data for Fusion Applications, 19-21 December 2016, Vienna, Austria Application of atomic data to quantitative

More information

Brewster Angle and Total Internal Reflection

Brewster Angle and Total Internal Reflection Lecture 5: Polarization Outline 1 Polarized Light in the Universe 2 Brewster Angle and Total Internal Reflection 3 Descriptions of Polarized Light 4 Polarizers 5 Retarders Christoph U. Keller, Leiden University,

More information

NIMROD FROM THE CUSTOMER S PERSPECTIVE MING CHU. General Atomics. Nimrod Project Review Meeting July 21 22, 1997

NIMROD FROM THE CUSTOMER S PERSPECTIVE MING CHU. General Atomics. Nimrod Project Review Meeting July 21 22, 1997 NIMROD FROM THE CUSTOMER S PERSPECTIVE MING CHU General Atomics Nimrod Project Review Meeting July 21 22, 1997 Work supported by the U.S. Department of Energy under Grant DE-FG03-95ER54309 and Contract

More information

CHEM*3440. Photon Energy Units. Spectrum of Electromagnetic Radiation. Chemical Instrumentation. Spectroscopic Experimental Concept.

CHEM*3440. Photon Energy Units. Spectrum of Electromagnetic Radiation. Chemical Instrumentation. Spectroscopic Experimental Concept. Spectrum of Electromagnetic Radiation Electromagnetic radiation is light. Different energy light interacts with different motions in molecules. CHEM*344 Chemical Instrumentation Topic 7 Spectrometry Radiofrequency

More information

Neoclassical Tearing Modes

Neoclassical Tearing Modes Neoclassical Tearing Modes O. Sauter 1, H. Zohm 2 1 CRPP-EPFL, Lausanne, Switzerland 2 Max-Planck-Institut für Plasmaphysik, Garching, Germany Physics of ITER DPG Advanced Physics School 22-26 Sept, 2014,

More information

Local Plasma Parameters and H-Mode Threshold in Alcator C-Mod

Local Plasma Parameters and H-Mode Threshold in Alcator C-Mod PFC/JA-96-42 Local Plasma Parameters and H-Mode Threshold in Alcator C-Mod A.E. Hubbard, J.A. Goetz, I.H. Hutchinson, Y. In, J. Irby, B. LaBombard, P.J. O'Shea, J.A. Snipes, P.C. Stek, Y. Takase, S.M.

More information

A Simulation Model for Drift Resistive Ballooning Turbulence Examining the Influence of Self-consistent Zonal Flows *

A Simulation Model for Drift Resistive Ballooning Turbulence Examining the Influence of Self-consistent Zonal Flows * A Simulation Model for Drift Resistive Ballooning Turbulence Examining the Influence of Self-consistent Zonal Flows * Bruce I. Cohen, Maxim V. Umansky, Ilon Joseph Lawrence Livermore National Laboratory

More information

Laser-Aided Plasma Diagnostics

Laser-Aided Plasma Diagnostics Laser-aided plasma diagnostics A.J.H. Donné, C.J. Barth Association EURATOM-FOM, FOM-Institute for Plasma Physics Rijnhuizen, Partner in the Trilateral Euregio Cluster, PO Box 107, 3430 BE Nieuwegein,

More information

Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX

Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX J.M. Canik 1, D.L. Brower 2, C. Deng 2, D.T.Anderson 1, F.S.B. Anderson 1, A.F. Almagri

More information

Progress Towards Confinement Improvement Using Current Profile Modification In The MST Reversed Field Pinch

Progress Towards Confinement Improvement Using Current Profile Modification In The MST Reversed Field Pinch Progress Towards Confinement Improvement Using Current Profile Modification In The MST Reversed Field Pinch C.B. Forest 1), J.K. Anderson 1), T.M. Biewer 1), D. Brower 2), B.E. Chapman 1), P.K. Chattopadhyay

More information

Two-color interferometry as a fluctuation diagnostic on Alcator C-Mod

Two-color interferometry as a fluctuation diagnostic on Alcator C-Mod PSFC/RR-13-2 DOE/ET-54512-382 Two-color interferometry as a fluctuation diagnostic on Alcator C-Mod Kasten, C.P. June, 2013 Plasma Science and Fusion Center Massachusetts Institute of Technology Cambridge

More information

Role of Magnetic Configuration and Heating Power in ITB Formation in JET.

Role of Magnetic Configuration and Heating Power in ITB Formation in JET. Role of Magnetic Configuration and Heating Power in ITB Formation in JET. The JET Team (presented by V. Parail 1 ) JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom 1 present address: EURATOM/UKAEA

More information

Experiments with a Supported Dipole

Experiments with a Supported Dipole Experiments with a Supported Dipole Reporting Measurements of the Interchange Instability Excited by Electron Pressure and Centrifugal Force Introduction Ben Levitt and Dmitry Maslovsky Collisionless Terrella

More information

Reduced MHD. Nick Murphy. Harvard-Smithsonian Center for Astrophysics. Astronomy 253: Plasma Astrophysics. February 19, 2014

Reduced MHD. Nick Murphy. Harvard-Smithsonian Center for Astrophysics. Astronomy 253: Plasma Astrophysics. February 19, 2014 Reduced MHD Nick Murphy Harvard-Smithsonian Center for Astrophysics Astronomy 253: Plasma Astrophysics February 19, 2014 These lecture notes are largely based on Lectures in Magnetohydrodynamics by Dalton

More information

Hybrid Kinetic-MHD simulations with NIMROD

Hybrid Kinetic-MHD simulations with NIMROD simulations with NIMROD 1 Yasushi Todo 2, Dylan P. Brennan 3, Kwang-Il You 4, Jae-Chun Seol 4 and the NIMROD Team 1 University of Washington, Seattle 2 NIFS, Toki-Japan 3 University of Tulsa 4 NFRI, Daejeon-Korea

More information

Pedestal Stability and Transport on the Alcator C-Mod Tokamak: Experiments in Support of Developing Predictive Capability

Pedestal Stability and Transport on the Alcator C-Mod Tokamak: Experiments in Support of Developing Predictive Capability 1 EX/P4-15 Pedestal Stability and Transport on the Alcator C-Mod Tokamak: Experiments in Support of Developing Predictive Capability J.W. Hughes 1, P.B. Snyder 2, X. Xu 3, J.R. Walk 1, E.M. Davis 1, R.M.

More information