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

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

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

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

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

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

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

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

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

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

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

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

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

Introduction to Fusion Physics

Introduction to Fusion Physics Introduction to Fusion Physics Hartmut Zohm Max-Planck-Institut für Plasmaphysik 85748 Garching DPG Advanced Physics School The Physics of ITER Bad Honnef, 22.09.2014 Energy from nuclear fusion Reduction

More information

Simulations of Sawteeth in CTH. Nicholas Roberds August 15, 2015

Simulations of Sawteeth in CTH. Nicholas Roberds August 15, 2015 Simulations of Sawteeth in CTH Nicholas Roberds August 15, 2015 Outline Problem Description Simulations of a small tokamak Simulations of CTH 2 Sawtoothing Sawtoothing is a phenomenon that is seen in all

More information

Let us consider a typical Michelson interferometer, where a broadband source is used for illumination (Fig. 1a).

Let us consider a typical Michelson interferometer, where a broadband source is used for illumination (Fig. 1a). 7.1. Low-Coherence Interferometry (LCI) Let us consider a typical Michelson interferometer, where a broadband source is used for illumination (Fig. 1a). The light is split by the beam splitter (BS) and

More information

Parity Violation Experiments & Beam Requirements

Parity Violation Experiments & Beam Requirements Parity Violation Experiments & Beam Requirements Riad Suleiman Center for Injectors and Sources MCC Ops Training August 05, 2009 Outline Fundamental Interactions and Conservation Rules Parity Reversal

More information

Introduction to polarimetry at HERA

Introduction to polarimetry at HERA Introduction to polarimetry at HERA Alex Tapper Electron polarisation at HERA The LPOL The TPOL The LPOL cavity Electron polarisation in storage rings Electron beam deflected around a ring with B field

More information

A Laser-Compass Magnet Probe for Field Measurements in Solenoids

A Laser-Compass Magnet Probe for Field Measurements in Solenoids A Laser-Compass Magnet Probe for Field Measurements in Solenoids T. Zickler (CERN) with contributions from F. Cottenot, T. Griesemer, C. Roche, J. Weick JUNE 2017 Outline Motivation Laser-Compass principle

More information

Development of a dispersion interferometer for magnetic confinement plasma and its application to atmospheric pressure plasmas

Development of a dispersion interferometer for magnetic confinement plasma and its application to atmospheric pressure plasmas Development of a dispersion interferometer for magnetic confinement plasma and its application to atmospheric pressure plasmas T. Akiyama 1, a, R. Yasuhara a, K. Kawahata a, K. Nakayama b, S. Okajima b,

More information

Nuclear spin maser with a novel masing mechanism and its application to the search for an atomic EDM in 129 Xe

Nuclear spin maser with a novel masing mechanism and its application to the search for an atomic EDM in 129 Xe Nuclear spin maser with a novel masing mechanism and its application to the search for an atomic EDM in 129 Xe A. Yoshimi RIKEN K. Asahi, S. Emori, M. Tsukui, RIKEN, Tokyo Institute of Technology Nuclear

More information

Hard Xray Diagnostic for Lower Hybrid Current Drive on Alcator C- Mod

Hard Xray Diagnostic for Lower Hybrid Current Drive on Alcator C- Mod Hard Xray Diagnostic for Lower Hybrid Current Drive on Alcator C- Mod J. Liptac, J. Decker, R. Parker, V. Tang, P. Bonoli MIT PSFC Y. Peysson CEA Cadarache APS 3 Albuquerque, NM Abstract A Lower Hybrid

More information

Polarimeter for an Accelerated Spheromak

Polarimeter for an Accelerated Spheromak Polarimeter for an Accelerated Spheromak by Patrick Jean-François Carle A thesis submitted to the Department of Physics, Engineering Physics & Astronomy in conformity with the requirements for the degree

More information

The RFP: Plasma Confinement with a Reversed Twist

The RFP: Plasma Confinement with a Reversed Twist The RFP: Plasma Confinement with a Reversed Twist JOHN SARFF Department of Physics University of Wisconsin-Madison Invited Tutorial 1997 Meeting APS DPP Pittsburgh Nov. 19, 1997 A tutorial on the Reversed

More information

Evaluation of CT injection to RFP for performance improvement and reconnection studies

Evaluation of CT injection to RFP for performance improvement and reconnection studies Evaluation of CT injection to RFP for performance improvement and reconnection studies S. Masamune A. Sanpei, T. Nagano, S. Nakanobo, R. Tsuboi, S. Kunita, M. Emori, H. Makizawa, H. Himura, N. Mizuguchi

More information

Validation of spectral MSE for Alcator C-Mod and for ITER

Validation of spectral MSE for Alcator C-Mod and for ITER Validation of spectral MSE for Alcator C-Mod and for ITER K.T. Liao 1, W.L. Rowan 1, R.T. Mumgaard 2, Bob Granetz 2, Steve Scott 3, Fred Levinton 4, Howard Yuh 4, O. Marchuk 5, Y. Ralchenko 6 1 The University

More information

EM Waves. From previous Lecture. This Lecture More on EM waves EM spectrum Polarization. Displacement currents Maxwell s equations EM Waves

EM Waves. From previous Lecture. This Lecture More on EM waves EM spectrum Polarization. Displacement currents Maxwell s equations EM Waves EM Waves This Lecture More on EM waves EM spectrum Polarization From previous Lecture Displacement currents Maxwell s equations EM Waves 1 Reminders on waves Traveling waves on a string along x obey the

More information

Progress on the Design of the Magnetic Field Measurement System for elisa

Progress on the Design of the Magnetic Field Measurement System for elisa Progress on the Design of the Magnetic Field Measurement System for elisa Ignacio Mateos Instituto de Ciencias del Espacio (CSIC-IEEC) Barcelona 10 th International LISA Symposium University of Florida,

More information

MST and the Reversed Field Pinch. John Sarff

MST and the Reversed Field Pinch. John Sarff MST and the Reversed Field Pinch John Sarff APAM Columbia University Sep 19, 2014 Outline Tutorial-level review of tearing stability, magnetic relaxation, and transport in the RFP Ion-related physics topics

More information

Confinement Studies during LHCD and LHW Ion Heating on HL-1M

Confinement Studies during LHCD and LHW Ion Heating on HL-1M Confinement Studies during LHCD and LHW Ion Heating on HL-1M Y. Liu, X.D.Li, E.Y. Wang, J. Rao, Y. Yuan, H. Xia, W.M. Xuan, S.W. Xue, X.T. Ding, G.C Guo, S.K. Yang, J.L. Luo, G.Y Liu, J.E. Zeng, L.F. Xie,

More information

Lab #13: Polarization

Lab #13: Polarization Lab #13: Polarization Introduction In this experiment we will investigate various properties associated with polarized light. We will study both its generation and application. Real world applications

More information

Tomographic imaging of resistive mode dynamics in the Madison Symmetric Torus reversed-field pinch

Tomographic imaging of resistive mode dynamics in the Madison Symmetric Torus reversed-field pinch PHYSICS OF PLASMAS 13, 012510 2006 Tomographic imaging of resistive mode dynamics in the Madison Symmetric Torus reversed-field pinch P. Franz, L. Marrelli, P. Piovesan, and I. Predebon Consorzio RFX,

More information

Spa$al structure of low- frequency plasma fluctua$ons in a laboratory dipole experiment

Spa$al structure of low- frequency plasma fluctua$ons in a laboratory dipole experiment Spa$al structure of low- frequency plasma fluctua$ons in a laboratory dipole experiment J.L. Ellsworth, R.M. Bergmann, J. Kesner, MIT M. Davis, D.T. Garnier, M.E. Mauel, Columbia University Introduc$on

More information

POLARIZATION OF LIGHT

POLARIZATION OF LIGHT POLARIZATION OF LIGHT OVERALL GOALS The Polarization of Light lab strongly emphasizes connecting mathematical formalism with measurable results. It is not your job to understand every aspect of the theory,

More information

Analysis and modelling of MHD instabilities in DIII-D plasmas for the ITER mission

Analysis and modelling of MHD instabilities in DIII-D plasmas for the ITER mission Analysis and modelling of MHD instabilities in DIII-D plasmas for the ITER mission by F. Turco 1 with J.M. Hanson 1, A.D. Turnbull 2, G.A. Navratil 1, C. Paz-Soldan 2, F. Carpanese 3, C.C. Petty 2, T.C.

More information

Survey on Laser Spectroscopic Techniques for Condensed Matter

Survey on Laser Spectroscopic Techniques for Condensed Matter Survey on Laser Spectroscopic Techniques for Condensed Matter Coherent Radiation Sources for Small Laboratories CW: Tunability: IR Visible Linewidth: 1 Hz Power: μw 10W Pulsed: Tunabality: THz Soft X-ray

More information

An Interferometric Force Probe for Thruster Plume Diagnostics

An Interferometric Force Probe for Thruster Plume Diagnostics An Interferometric Force Probe for Thruster Plume Diagnostics IEPC-2015-419/ISTS-2015-b-419 Presented at Joint Conference of 30th International Symposium on Space Technology and Science, 34th International

More information

STABILIZATION OF m=2/n=1 TEARING MODES BY ELECTRON CYCLOTRON CURRENT DRIVE IN THE DIII D TOKAMAK

STABILIZATION OF m=2/n=1 TEARING MODES BY ELECTRON CYCLOTRON CURRENT DRIVE IN THE DIII D TOKAMAK GA A24738 STABILIZATION OF m=2/n=1 TEARING MODES BY ELECTRON CYCLOTRON CURRENT DRIVE IN THE DIII D TOKAMAK by T.C. LUCE, C.C. PETTY, D.A. HUMPHREYS, R.J. LA HAYE, and R. PRATER JULY 24 DISCLAIMER This

More information

Measurement of wakefields in hollow plasma channels Carl A. Lindstrøm (University of Oslo)

Measurement of wakefields in hollow plasma channels Carl A. Lindstrøm (University of Oslo) Measurement of wakefields in hollow plasma channels Carl A. Lindstrøm (University of Oslo) in collaboration with Spencer Gessner (CERN) presented by Erik Adli (University of Oslo) FACET-II Science Workshop

More information

DIODE LASER SPECTROSCOPY

DIODE LASER SPECTROSCOPY DIODE LASER SPECTROSCOPY Spectroscopy, and Much More, Using Modern Optics Observe Doppler-Free Spectroscopy of Rubidium Gas Michelson Interferometer Used to Calibrate Laser Sweep Observe Resonant Faraday

More information

ICRH Experiments on the Spherical Tokamak Globus-M

ICRH Experiments on the Spherical Tokamak Globus-M 1 Experiments on the Spherical Tokamak Globus-M V.K.Gusev 1), F.V.Chernyshev 1), V.V.Dyachenko 1), Yu.V.Petrov 1), N.V.Sakharov 1), O.N.Shcherbinin 1), V.L.Vdovin 2) 1) A.F.Ioffe Physico-Technical Institute,

More information

Large Scale Polarization Explorer

Large Scale Polarization Explorer Science goal and performance (Univ. Roma La Sapienza) for the LSPE collaboration Page 1 LSPE is a balloon payload aimed at: Measure large scale CMB polarization and temperature anisotropies Explore large

More information

Direct drive by cyclotron heating can explain spontaneous rotation in tokamaks

Direct drive by cyclotron heating can explain spontaneous rotation in tokamaks Direct drive by cyclotron heating can explain spontaneous rotation in tokamaks J. W. Van Dam and L.-J. Zheng Institute for Fusion Studies University of Texas at Austin 12th US-EU Transport Task Force Annual

More information

Light Waves and Polarization

Light Waves and Polarization Light Waves and Polarization Xavier Fernando Ryerson Communications Lab http://www.ee.ryerson.ca/~fernando The Nature of Light There are three theories explain the nature of light: Quantum Theory Light

More information

Squeezed Light for Gravitational Wave Interferometers

Squeezed Light for Gravitational Wave Interferometers Squeezed Light for Gravitational Wave Interferometers R. Schnabel, S. Chelkowski, H. Vahlbruch, B. Hage, A. Franzen, and K. Danzmann. Institut für Atom- und Molekülphysik, Universität Hannover Max-Planck-Institut

More information

Gyrokinetic Transport Driven by Energetic Particle Modes

Gyrokinetic Transport Driven by Energetic Particle Modes Gyrokinetic Transport Driven by Energetic Particle Modes by Eric Bass (General Atomics) Collaborators: Ron Waltz, Ming Chu GSEP Workshop General Atomics August 10, 2009 Outline I. Background Alfvén (TAE/EPM)

More information

and the radiation from source 2 has the form. The vector r points from the origin to the point P. What will the net electric field be at point P?

and the radiation from source 2 has the form. The vector r points from the origin to the point P. What will the net electric field be at point P? Physics 3 Interference and Interferometry Page 1 of 6 Interference Imagine that we have two or more waves that interact at a single point. At that point, we are concerned with the interaction of those

More information

The Field-Reversed Configuration (FRC) is a high-beta compact toroidal in which the external field is reversed on axis by azimuthal plasma The FRC is

The Field-Reversed Configuration (FRC) is a high-beta compact toroidal in which the external field is reversed on axis by azimuthal plasma The FRC is and Stability of Field-Reversed Equilibrium with Toroidal Field Configurations Atomics General Box 85608, San Diego, California 92186-5608 P.O. APS Annual APS Meeting of the Division of Plasma Physics

More information

Lasers and Electro-optics

Lasers and Electro-optics Lasers and Electro-optics Second Edition CHRISTOPHER C. DAVIS University of Maryland III ^0 CAMBRIDGE UNIVERSITY PRESS Preface to the Second Edition page xv 1 Electromagnetic waves, light, and lasers 1

More information

Power Balance and Scaling of the Radiated Power in the Divertor and Main Plasma of Alcator C-Mod

Power Balance and Scaling of the Radiated Power in the Divertor and Main Plasma of Alcator C-Mod PFC/JA-94-15 Power Balance and Scaling of the Radiated Power in the Divertor and Main Plasma of Alcator C-Mod J.A. Goetz, B. Lipschultz, M.A. Graf, C. Kurz, R. Nachtrieb, J.A. Snipes, J.L. Terry Plasma

More information

Recent Development of LHD Experiment. O.Motojima for the LHD team National Institute for Fusion Science

Recent Development of LHD Experiment. O.Motojima for the LHD team National Institute for Fusion Science Recent Development of LHD Experiment O.Motojima for the LHD team National Institute for Fusion Science 4521 1 Primary goal of LHD project 1. Transport studies in sufficiently high n E T regime relevant

More information

Toroidal confinement of non-neutral plasma. Martin Droba

Toroidal confinement of non-neutral plasma. Martin Droba Toroidal confinement of non-neutral plasma Martin Droba Contents Experiments with toroidal non-neutral plasma Magnetic surfaces CNT and IAP-high current ring Conclusion 2. Experiments with toroidal non-neutral

More information

Identification of characteristic ELM evolution patterns with Alfven-scale measurements and unsupervised machine learning analysis

Identification of characteristic ELM evolution patterns with Alfven-scale measurements and unsupervised machine learning analysis Identification of characteristic ELM evolution patterns with Alfven-scale measurements and unsupervised machine learning analysis David R. Smith 1, G. McKee 1, R. Fonck 1, A. Diallo 2, S. Kaye 2, B. LeBlanc

More information

Physics 313: Laboratory 8 - Polarization of Light Electric Fields

Physics 313: Laboratory 8 - Polarization of Light Electric Fields Physics 313: Laboratory 8 - Polarization of Light Electric Fields Introduction: The electric fields that compose light have a magnitude, phase, and direction. The oscillating phase of the field and the

More information

A Brief Introduction to Medical Imaging. Outline

A Brief Introduction to Medical Imaging. Outline A Brief Introduction to Medical Imaging Outline General Goals Linear Imaging Systems An Example, The Pin Hole Camera Radiations and Their Interactions with Matter Coherent vs. Incoherent Imaging Length

More information

GA A26887 ADVANCES TOWARD QH-MODE VIABILITY FOR ELM-FREE OPERATION IN ITER

GA A26887 ADVANCES TOWARD QH-MODE VIABILITY FOR ELM-FREE OPERATION IN ITER GA A26887 ADVANCES TOWARD QH-MODE VIABILITY FOR ELM-FREE OPERATION IN ITER by A.M. GAROFALO, K.H. BURRELL, M.J. LANCTOT, H. REIMERDES, W.M. SOLOMON and L. SCHMITZ OCTOBER 2010 DISCLAIMER This report was

More information

Simultaneous Temperature and Strain Sensing for Cryogenic Applications Using Dual-Wavelength Fiber Bragg Gratings

Simultaneous Temperature and Strain Sensing for Cryogenic Applications Using Dual-Wavelength Fiber Bragg Gratings Simultaneous Temperature and Strain Sensing for Cryogenic Applications Using Dual-Wavelength Fiber Bragg Gratings Meng-Chou Wu *, William H. Prosser NASA, Langley Research Center, MS 231, Hampton, VA,

More information

Development of a Dedicated Hard X-Ray Polarimeter Mark L. McConnell, James R. Ledoux, John R. Macri, and James M. Ryan

Development of a Dedicated Hard X-Ray Polarimeter Mark L. McConnell, James R. Ledoux, John R. Macri, and James M. Ryan Development of a Dedicated Hard X-Ray Polarimeter Mark L. McConnell, James R. Ledoux, John R. Macri, and James M. Ryan Space Science Center University of New Hampshire Durham, NH AAS-HEAD Mt. Tremblant,

More information

Topic 4: Waves 4.3 Wave characteristics

Topic 4: Waves 4.3 Wave characteristics Guidance: Students will be expected to calculate the resultant of two waves or pulses both graphically and algebraically Methods of polarization will be restricted to the use of polarizing filters and

More information

POLARIZATION FUNDAMENTAL OPTICS POLARIZATION STATES 1. CARTESIAN REPRESENTATION 2. CIRCULAR REPRESENTATION. Polarization. marketplace.idexop.

POLARIZATION FUNDAMENTAL OPTICS POLARIZATION STATES 1. CARTESIAN REPRESENTATION 2. CIRCULAR REPRESENTATION. Polarization. marketplace.idexop. POLARIZATION POLARIZATION STATS Four numbers are required to describe a single plane wave Fourier component traveling in the + z direction. These can be thought of as the amplitude and phase shift of the

More information

Current Profile Measurement Techniques

Current Profile Measurement Techniques Current Profile Measurement Techniques The JET MSE Diagnostic N C Hawkes Outline Current density profile in tokamaks Equilibrium reconstructions Motional Stark Effect and Zeeman (heating beams/li beam)

More information

Heat Transport in a Stochastic Magnetic Field. John Sarff Physics Dept, UW-Madison

Heat Transport in a Stochastic Magnetic Field. John Sarff Physics Dept, UW-Madison Heat Transport in a Stochastic Magnetic Field John Sarff Physics Dept, UW-Madison CMPD & CMSO Winter School UCLA Jan 5-10, 2009 Magnetic perturbations can destroy the nested-surface topology desired for

More information

Phase Sensitive Faraday Rotation in. and various Diamagnetic liquid Samples

Phase Sensitive Faraday Rotation in. and various Diamagnetic liquid Samples Phase Sensitive Faraday Rotation in TERBIUM GALLIUM GARNET crystal and various Diamagnetic liquid Samples Supervisor: Dr. Saadat Anwar Siddiqi Co-Supervisor: Dr. Muhammad Sabieh Anwar Presented by: Aysha

More information

Using a Microwave Interferometer to Measure Plasma Density Mentor: Prof. W. Gekelman. P. Pribyl (UCLA)

Using a Microwave Interferometer to Measure Plasma Density Mentor: Prof. W. Gekelman. P. Pribyl (UCLA) Using a Microwave Interferometer to Measure Plasma Density Avital Levi Mentor: Prof. W. Gekelman. P. Pribyl (UCLA) Introduction: Plasma is the fourth state of matter. It is composed of fully or partially

More information

III. Spherical Waves and Radiation

III. Spherical Waves and Radiation III. Spherical Waves and Radiation Antennas radiate spherical waves into free space Receiving antennas, reciprocity, path gain and path loss Noise as a limit to reception Ray model for antennas above a

More information

CONTRIBUTIONS FROM THE NEUTRAL BEAMLINE IRON TO PLASMA NON-AXISYMMETRIC FIELDS

CONTRIBUTIONS FROM THE NEUTRAL BEAMLINE IRON TO PLASMA NON-AXISYMMETRIC FIELDS GA A24838 CONTRIBUTIONS FROM THE NEUTRAL BEAMLINE IRON TO PLASMA NON-AXISYMMETRIC FIELDS by J.L. LUXON MARCH 2005 QTYUIOP DISCLAIMER This report was prepared as an account of work sponsored by an agency

More information

Dr. Linlin Ge The University of New South Wales

Dr. Linlin Ge  The University of New South Wales GMAT 9600 Principles of Remote Sensing Week2 Electromagnetic Radiation: Definition & Physics Dr. Linlin Ge www.gmat.unsw.edu.au/linlinge Basic radiation quantities Outline Wave and quantum properties Polarization

More information

arxiv:physics/ v1 [physics.plasm-ph] 5 Nov 2004

arxiv:physics/ v1 [physics.plasm-ph] 5 Nov 2004 Ion Resonance Instability in the ELTRAP electron plasma G. Bettega, 1 F. Cavaliere, 2 M. Cavenago, 3 A. Illiberi, 1 R. Pozzoli, 1 and M. Romé 1 1 INFM Milano Università, INFN Sezione di Milano, Dipartimento

More information

Model based optimization and estimation of the field map during the breakdown phase in the ITER tokamak

Model based optimization and estimation of the field map during the breakdown phase in the ITER tokamak Model based optimization and estimation of the field map during the breakdown phase in the ITER tokamak Roberto Ambrosino 1 Gianmaria De Tommasi 2 Massimiliano Mattei 3 Alfredo Pironti 2 1 CREATE, Università

More information

SLS at the Paul Scherrer Institute (PSI), Villigen, Switzerland

SLS at the Paul Scherrer Institute (PSI), Villigen, Switzerland SLS at the Paul Scherrer Institute (PSI), Villigen, Switzerland Michael Böge 1 SLS Team at PSI Michael Böge 2 Layout of the SLS Linac, Transferlines Booster Storage Ring (SR) Beamlines and Insertion Devices

More information

Introduction to FT-IR Spectroscopy

Introduction to FT-IR Spectroscopy Introduction to FT-IR Spectroscopy An FT-IR Spectrometer is an instrument which acquires broadband NIR to FIR spectra. Unlike a dispersive instrument, i.e. grating monochromator or spectrograph, an FT-IR

More information

Initial Experimental Program Plan for HSX

Initial Experimental Program Plan for HSX Initial Experimental Program Plan for HSX D.T. Anderson, A F. Almagri, F.S.B. Anderson, J. Chen, S. Gerhardt, V. Sakaguchi, J. Shafii and J.N. Talmadge, UW-Madison HSX Plasma Laboratory Team The Helically

More information

Nanoscale Energy Conversion and Information Processing Devices - NanoNice - Photoacoustic response in mesoscopic systems

Nanoscale Energy Conversion and Information Processing Devices - NanoNice - Photoacoustic response in mesoscopic systems Nanoscale Energy Conversion and Information Processing Devices - NanoNice - Photoacoustic response in mesoscopic systems Photonics group W. Claeys, S. Dilhair, S. Grauby, JM. Rampnoux, L. Patino Lopez,

More information

4: birefringence and phase matching

4: birefringence and phase matching /3/7 4: birefringence and phase matching Polarization states in EM Linear anisotropic response χ () tensor and its symmetry properties Working with the index ellipsoid: angle tuning Phase matching in crystals

More information

Saturated ideal modes in advanced tokamak regimes in MAST

Saturated ideal modes in advanced tokamak regimes in MAST Saturated ideal modes in advanced tokamak regimes in MAST IT Chapman 1, M-D Hua 1,2, SD Pinches 1, RJ Akers 1, AR Field 1, JP Graves 3, RJ Hastie 1, CA Michael 1 and the MAST Team 1 EURATOM/CCFE Fusion

More information

Plasma Stability in Tokamaks and Stellarators

Plasma Stability in Tokamaks and Stellarators Plasma Stability in Tokamaks and Stellarators Gerald A. Navratil GCEP Fusion Energy Workshop Princeton, NJ 1- May 006 ACKNOWLEDGEMENTS Borrowed VGs from many colleagues: J. Bialek, A. Garofalo,R. Goldston,

More information

Flow dynamics and plasma heating of spheromaks in SSX

Flow dynamics and plasma heating of spheromaks in SSX Flow dynamics and plasma heating of spheromaks in SSX M. R. Brown and C. D. Cothran, D. Cohen, J. Horwitz, and V. Chaplin Department of Physics and Astronomy Center for Magnetic Self Organization Swarthmore

More information

Impact of Energetic-Ion-Driven Global Modes on Toroidal Plasma Confinements

Impact of Energetic-Ion-Driven Global Modes on Toroidal Plasma Confinements Impact of Energetic-Ion-Driven Global Modes on Toroidal Plasma Confinements Kazuo TOI CHS & LHD Experimental Group National Institute for Fusion Science Toki 59-5292, Japan Special contributions from:

More information

January 2010, Maynooth. Photons. Myungshik Kim.

January 2010, Maynooth. Photons. Myungshik Kim. January 2010, Maynooth Photons Myungshik Kim http://www.qteq.info Contents Einstein 1905 Einstein 1917 Hanbury Brown and Twiss Light quanta In 1900, Max Planck was working on black-body radiation and suggested

More information

Expected Performance From WIYN Tip-Tilt Imaging

Expected Performance From WIYN Tip-Tilt Imaging Expected Performance From WIYN Tip-Tilt Imaging C. F. Claver 3 September 1997 Overview Image motion studies done at WIYN show that a significant improvement to delivered image quality can be obtained from

More information

Progress Report on the A4 Compton Backscattering Polarimeter

Progress Report on the A4 Compton Backscattering Polarimeter A4 Progress Report on the A4 Compton Backscattering Polarimeter Yoshio Imai, Institut für Kernphysik, Universität Mainz 8.6.24 International Workshop on Parity Violation and Hadronic Structure, LPSC Grenoble

More information

Chapter 12. Magnetic Fusion Toroidal Machines: Principles, results, perspective

Chapter 12. Magnetic Fusion Toroidal Machines: Principles, results, perspective Chapter 12 Magnetic Fusion Toroidal Machines: Principles, results, perspective S. Atzeni May 10, 2010; rev.: May 16, 2012 English version: May 17, 2017 1 Magnetic confinement fusion plasmas low density

More information

Cherenkov Detector Prototype for ILC Polarimetry

Cherenkov Detector Prototype for ILC Polarimetry Cherenkov Detector Prototype for ILC Polarimetry Daniela Käfer, Christoph Bartels, Christian Helebrant and Jenny List Deutsches Elektronen Synchrotron (DESY), Notkestr. 85, 2267 Hamburg, Germany, E-mail:

More information

Linac optimisation for the New Light Source

Linac optimisation for the New Light Source Linac optimisation for the New Light Source NLS source requirements Electron beam requirements for seeded cascade harmonic generation LINAC optimisation (2BC vs 3 BC) CSR issues energy chirp issues jitter

More information

MODELING AND SIMULATION OF LOW TEMPERATURE PLASMA DISCHARGES

MODELING AND SIMULATION OF LOW TEMPERATURE PLASMA DISCHARGES MODELING AND SIMULATION OF LOW TEMPERATURE PLASMA DISCHARGES Michael A. Lieberman University of California, Berkeley lieber@eecs.berkeley.edu DOE Center on Annual Meeting May 2015 Download this talk: http://www.eecs.berkeley.edu/~lieber

More information

Improved absolute calibration of core Thomson scattering(ts) diagnostics on Alctor C-Mod

Improved absolute calibration of core Thomson scattering(ts) diagnostics on Alctor C-Mod Improved absolute calibration of core Thomson scattering(ts) diagnostics on Alctor C-Mod Yunxing Ma, J.W.Hughes, A.Hubbard MIT Plasma Science and Fusion Center Presented at 2008 APS DPP Conference Dallas,

More information

B 2 P 2, which implies that g B should be

B 2 P 2, which implies that g B should be Enhanced Summary of G.P. Agrawal Nonlinear Fiber Optics (3rd ed) Chapter 9 on SBS Stimulated Brillouin scattering is a nonlinear three-wave interaction between a forward-going laser pump beam P, a forward-going

More information

MHD instability driven by supra-thermal electrons in TJ-II stellarator

MHD instability driven by supra-thermal electrons in TJ-II stellarator MHD instability driven by supra-thermal electrons in TJ-II stellarator K. Nagaoka 1, S. Yamamoto 2, S. Ohshima 2, E. Ascasíbar 3, R. Jiménez-Gómez 3, C. Hidalgo 3, M.A. Pedrosa 3, M. Ochando 3, A.V. Melnikov

More information

DNB Program. W.L. Rowan, D. Beals, R.V. Bravenec, M.B. Sampsell, D.M. Patterson Fusion Research Center, University of Texas at Austin

DNB Program. W.L. Rowan, D. Beals, R.V. Bravenec, M.B. Sampsell, D.M. Patterson Fusion Research Center, University of Texas at Austin DNB Program W.L. Rowan, D. Beals, R.V. Bravenec, M.B. Sampsell, D.M. Patterson Fusion Research Center, University of Texas at Austin G. Schilling, G. Kramer, R. Feder Princeton Plasma Physics Laboratory

More information

PMD Compensator and PMD Emulator

PMD Compensator and PMD Emulator by Yu Mimura *, Kazuhiro Ikeda *, Tatsuya Hatano *, Takeshi Takagi *, Sugio Wako * and Hiroshi Matsuura * As a technology for increasing the capacity to meet the growing demand ABSTRACT for communications

More information

PFC/JA NEUTRAL BEAM PENETRATION CONSIDERATIONS FOR CIT

PFC/JA NEUTRAL BEAM PENETRATION CONSIDERATIONS FOR CIT PFC/JA-88-12 NEUTRAL BEAM PENETRATION CONSIDERATIONS FOR CIT J. Wei, L. Bromberg, R. C. Myer, and D. R. Cohn Plasma Fusion Center Massachusetts Institute of Technology Cambridge, Massachusetts 2139 To

More information

International Workshop on the Frontiers of Modern Plasma Physics July On the Nature of Plasma Core Turbulence.

International Workshop on the Frontiers of Modern Plasma Physics July On the Nature of Plasma Core Turbulence. 1953-43 International Workshop on the Frontiers of Modern Plasma Physics 14-25 July 2008 On the Nature of Plasma Core Turbulence. F. Jenko Max-Planck Institute fuer Plasmaphysik Garching bei Munchen Germany

More information

Chamber Development Plan and Chamber Simulation Experiments

Chamber Development Plan and Chamber Simulation Experiments Chamber Development Plan and Chamber Simulation Experiments Farrokh Najmabadi HAPL Meeting November 12-13, 2001 Livermore, CA Electronic copy: http://aries.ucsd.edu/najmabadi/talks UCSD IFE Web Site: http://aries.ucsd.edu/ife

More information

A Helical Undulator Wave-guide Inverse Free- Electron Laser

A Helical Undulator Wave-guide Inverse Free- Electron Laser A Helical Undulator Wave-guide Inverse Free- Electron Laser J. Rosenzweig*, N. Bodzin*, P. Frigola*, C. Joshi ℵ, P. Musumeci*, C. Pellegrini*, S. Tochitsky ℵ, and G. Travish* *UCLA Dept. of Physics and

More information

Nonsolenoidal Startup and Plasma Stability at Near-Unity Aspect Ratio in the Pegasus Toroidal Experiment

Nonsolenoidal Startup and Plasma Stability at Near-Unity Aspect Ratio in the Pegasus Toroidal Experiment 1 EXS/P2-07 Nonsolenoidal Startup and Plasma Stability at Near-Unity Aspect Ratio in the Pegasus Toroidal Experiment R.J. Fonck 1), D.J. Battaglia 2), M.W. Bongard 1), E.T. Hinson 1), A.J. Redd 1), D.J.

More information

Chapter 2 Correlation Force Spectroscopy

Chapter 2 Correlation Force Spectroscopy Chapter 2 Correlation Force Spectroscopy Correlation Force Spectroscopy: Rationale In principle, the main advantage of correlation force spectroscopy (CFS) over onecantilever atomic force microscopy (AFM)

More information

A Study of Directly Launched Ion Bernstein Waves in a Tokamak

A Study of Directly Launched Ion Bernstein Waves in a Tokamak PFC-/JA-86-6 A Study of Directly Launched Ion Bernstein Waves in a Tokamak Y. Takase, J. D. Moody, C. L. Fiore, F. S. McDermott, M. Porkolab, and J. Squire Plasma Fusion Center Massachusetts Institute

More information

ELM Suppression in DIII-D Hybrid Plasmas Using n=3 Resonant Magnetic Perturbations

ELM Suppression in DIII-D Hybrid Plasmas Using n=3 Resonant Magnetic Perturbations 1 EXC/P5-02 ELM Suppression in DIII-D Hybrid Plasmas Using n=3 Resonant Magnetic Perturbations B. Hudson 1, T.E. Evans 2, T.H. Osborne 2, C.C. Petty 2, and P.B. Snyder 2 1 Oak Ridge Institute for Science

More information

Integration of Fokker Planck calculation in full wave FEM simulation of LH waves

Integration of Fokker Planck calculation in full wave FEM simulation of LH waves Integration of Fokker Planck calculation in full wave FEM simulation of LH waves O. Meneghini S. Shiraiwa R. Parker 51 st DPP APS, Atlanta November 4, 29 L H E A F * Work supported by USDOE awards DE-FC2-99ER54512

More information

GA A22337 INITIAL OPERATION OF THE DIVERTOR THOMSON SCATTERING DIAGNOSTIC ON DIII D

GA A22337 INITIAL OPERATION OF THE DIVERTOR THOMSON SCATTERING DIAGNOSTIC ON DIII D GA A22337 INITIAL OPERATION OF THE DIVERTOR THOMSON SCATTERING by T.N. CARLSTROM, C.L. HSIEH, R.E. STOCKDALE, D.G. NILSON, and D.N. HILL MAY 1996 GA A22337 INITIAL OPERATION OF THE DIVERTOR THOMSON SCATTERING

More information