Abstract. Department of Physics. University of Wisconsin UCLA UCLA
|
|
- Brent Cook
- 5 years ago
- Views:
Transcription
1 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 frequency response up to 1 MHz. Fast time resolution and low phase noise of the polarimeter enable us to resolve m=1 resistive tearing modes as a precursor to the sawtooth crash. Turbulent magnetic field fluctuations up to 1 khz have also been observed. The chord-averaged radial magnetic field fluctuation level is about 33 G or 1%. A broad power spectrum peaks at 1- khz and is dominated by m=1 magnetic field fluctuations. By computing the coherence between two toroidally-displaced chords, one can determine the toroidal mode number and rotation speed. The phase of radial magnetic field fluctuations lags poloidal magnetic field fluctuations by 9 degrees which is in agreement with MHD computation for MST. Magnetic field fluctuations are reduced by a factor of four during a high confinement PPCD discharges, consistent with energy confinement improvement.
2 Polarimetry Technique Two counter-rotating circularly polarized FIR beams are launched into plasma. The phase difference between two beams is proportional to Faraday rotation angle. 3 λ e 13 Ψ= ψ = nb = 6 1 λ 3 e // dz. nb e // dz 8π c ε m e Faraday rotation angle is proportional to the product of electron density and magnetic field along the beam direction. Interferometer gives electron density by measuring the average phase of two probe-lo mixing products.
3 3-Wave Laser Polarimetry λ/ Plate Reference Mixer Lens ω Probe Beams Plasma Mixer ω 1 ω Combiner ω 1 λ/4 Plate Plasma Lens ω 3 L.O.Beam Beam Splitter FIR LASER
4 Faraday Rotation Fluctuation m=1 activity, fluctuating amplitude.1-. degree in phase between x=- and 13 Faraday (deg.) - - cm time(ms) out of phase between central chord and edge chords in phase between two edge chords (x=-4,36) 6 Faraday (deg.) 4 - ~ Brms o = 33 G [. 1 ] -4 cm time(ms)
5 Fast Polarimeter Correlation with Magnetic Coil 1. Faraday rotation -Magnetic fluctuation at wall coherence.8 Coherence.6.4 1kHz, m=1 coherence statistical noise Frequency [khz]
6 Central Chord Density Fluctuations P6 interferometer chord.x1-3 density fluctuation amplitude average over 1-ms for density s PPCD s STND no m=1 peak. 4 6 frequency (khz) 8 1
7 Magnetic Fluctuation Signal Analysis Faraday Rotation Ψ(,) xt = c nrtb (,) (, rxtdz,) F linearize the equation using z Z B θ B r Ψ(x,t) = Ψ ( x) + Ψ 1 ( x, t ) nrt (,) = n() r + n (,) rt 1 r θ B(, rxt,) = B (, rxt,) + B (, rxt,) Ψ Ψ z z z1 = c n B dz, F z [ ] = c n B dz+ B n dz 1 F 1 z z1 X x B = B θ = B x π B = µ J πr r, z θ cos θ, r θ ( ), c n B dz = 5. c µ J( ) x ndz. F 1 zo F 1 ( 6 17 J( ) =. 1 A/ m, ndz 1 = 1 m ) o at x = 7 cm For m = 1 mode, ndz. For central chords, cosθ,sinθ 1, we have 1 ( ) = Ψ c[ B ndz] = c B sin θ + B cos θ ndz c B (,) rtn () rdz 1 F z1 F r θ F r
8 For these edge chords, B B x µ Id x z = θ = r π r µ I c n B dz n x d r dz µ I 9 d x n r dz F 1 z = 1 9 min( ξ) =. π π 17 3 ( I = 4kA, n = 1 m, 9 ξ 9) d min at x = 43 cm o The measured fluctuation amplitude for edge chords are about.. It means that density fluctuation contributes the most of Faraday rotation fluctuation signals in edge chords. o Fast polarimetry measures magnetic fluctuation in central chords. A line averaged magnetic fluctuation amplitude can be obtained. Fast polarimetry measures density fluctuation in edge chords with better phase resolution; Toroidal mode number can be determined by the correlation between two toroidally displaced two chords;
9 Fluctuation Signals Analysis Radial Magnetic fluctuations dominate Faraday rotation fluctuations in central chords (x=-,6,13 cm) because density fluctuations are small and probing beam is nearly perpendicular to equilibrium field. Density fluctuations dominate Faraday rotation fluctuations for edge chords (x=-3,-4,36,43 cm) where density fluctuations are large due to advection.
10 J() measurement Cylindrical- Slope Model z o r θ x B θ Ψ() x = c n () r B ()cos r θdz, F e x = rcos θ = R R, z = rsin θ, θ Ψ dψ x, r, Bθ π r = µ J( r) πr, = x dx () Ψ c n B r θ = F e xdz = 5. cfµ J( ) x ne( r) f ( r) dz r where Jr ( ) = J f( r) and assuming f( r) = ( 1 ( r/ a) ) I = J() r ds = J() πr f(, r β) dris total discharge current.. d β J( ) = dψ 1 µ c dx n () r f(, r β) dz F e
11 Comparison of J() Estimate with α Model J (MA/m^) j From Faraday Rotation measurement j ( α model ) ( β=7%) j ( α model ) ( β=1%) Time (ms) J( ) = dψ 1 µ c dx n () r f(, r β) dz F e
12 Current Density Fluctuations 5 4 J = 5% J J (MA/m ) 3 ~ J J 5% Time (ms) s j_sdev=.1568 (1-15 ms) J_avg= J_sdev/J_avg=5% 16 18
13 Time Evolution of Faraday Rotation Angle F =-., I p = 4 ka, 11 channel data, Faraday Rotation (deg.) s cm Time (ms) Faraday Rotation (deg.) cm Time (ms)
14 Time Evolution of Electron Density F =-., I p = 387 ka, 11 channel data, (1 13 cm - ) ne1 ne ne3 ne4 ne5 ne6 nedl Time (ms) (1 13 cm - ) ne7 ne8 ne9 ne1 ne11 nedl Time (ms) 5 6 7
15 Magnetic Fluctuation B r Amplitude and Comparison with MHD code Measured Faraday rotation fluctuation o =.1, 19 3 n = m, L = 1. 4m, c = ( m / T) Line average B r = 33G F Ψ 1 Density (1^19/m^3) Density before ST (t=-.75ms) r/a 1. Br(m=1,n=6)/B x br_m=1,n=6 from DEBS code c F n e B r dz=. degree Faraday fluctuation.1-. degree.4 r/a
16 Spatial Correlation of Magnetic Fluctuation B r 4 Phase between x= 6 cm and 13 cm 8 Phase(degree) - m= m=1 4 6 f(khz) phase n n coherence.6.4. coherence between x=6 and 13 cm 11333(STD) -3ms coherence noise. 4 6 f(khz) 8 1 Coherence coherence between x=-4 and 36 cm m= m=1 coherence phase 1 phase( π). 4 6 f(khz) 8 1-1
17 B r Wavenumber Spectrum <Br> (G/Hz 1/ ) Frequency Spectrum 4 6 Frequency(kHz) 8 1 <Br> (G) Wavenumber Spectrum m=1 (shot 11333, F=-.) - B r ~ n Toroidal Mode Number 6 8
18 Magnetic Fluctuation change during Sawtooth Cycle B r (arb) ~ B r rms ~ r B B 1% time (ms) Amplitude approximately 1% before crash Fluctuations increase at crash by x3
19 Current Density and Magnetic Fluctuations fluctuation amplitude (arb.) 4x J() and B r fluctuation spectrum (FFT) s (F<) J ~ ~ B r 4 6 frequency (khz) 8 J B r 1
20 Quasi Single Helicity in PPCD frequency (khz) QSH Spectrum STND X = 6 cm frequency (khz) time (ms) S137_CH6 (6 cm) PPCD X = 36 cm time (ms) S137_CH1 (36 cm)
21 Fast Polarimetry during PPCD I p =4kA, 11 channel data Faraday Rotation (deg.) cm Time (ms) Faraday Rotation (deg.) cm Time (ms)
22 Sawteeth Ensembled Density Dataset n e dl [x1 15 cm - ] n e dl [x1 15 cm - ] cm Time [msec] -4 cm Time [msec]
23 Ensembled Faraday Dataset Faraday Rot. (deg.) ms + 1m -4-4 R-R (cm) Faraday Rot. (deg.) cm -3 cm - cm 13 cm 43 cm 8 cm time (ms) Faraday Rot. (deg.) cm -9 cm 6cm 36 cm 1 cm Time (ms)
24 Magnetic Fluctuation B r Phase B r lags B θ 9 degree 1 pn, = 6 1 pn, = 6 Ψ Ψ = B B.5 Faraday Rot. (deg.) f(khz) phase (degree) Phase between Br and Bp(n=6) at wall, Phase(Br)-Phase(Bp)=phase-1.6=-9 degree f=khz 4 f(kh) 6 8 1
25 Faraday Rotation (rms_deg. ) Density_fluc (rms ) Magnetic Fluctuation Reduction during PPCD Magnetic field fluctuation (x=6 cm) Standard (113336) PPCD (113511) 4 6 Frequency (khz) Density fluctuation (x=6 cm) 8 Standard ( ) PPCD (113844) Frequency( khz)
26 Br fluctuations vs time Faraday Rotation( deg_rms) Standard 4kA (113336) PPCD 4kA ( ) std_noise ppcd_noise time(ms) 5
27 Magnetic Fluctuation B r Spectrum 14x F< shot (113336) PPCD shot ( ) F< shot ( w/o sawtooth,16-3ms) Average over 1ms --ms s Power Frequency (khz) 8 1 Frequency (khz) standard PPCD Time (ms)
28 Faraday Rotation (rms_deg. ) Density_fluc (rms ) Magnetic Fluctuation Reduction during PPCD Magnetic field fluctuation (x=6 cm) Standard (113336) PPCD (113511) 4 6 Frequency (khz) Density fluctuation (x=6 cm) 8 Standard ( ) PPCD (113844) Frequency( khz)
29 Magnetic Fluctuation Spectra Frequency(kHz) Frequency(kHz) Standard 4kA 1 15 time(ms) PPCD 4kA S36 WL_6 51_CH6_x 1 15 time (ms) amplitude
30 Summary Fast-polarimeter has 4 µs time response and.5 o phase resolution. Internal radial magnetic field fluctuations are measured. ~ Br ~ = 1% Br = 33 G, rms B Internal magnetic field fluctuations are significantly reduced during a high confinement PPCD plasmas. ~ B r 75%
31 Future Work Measurement of dynamics of current density profile J(r,t) in MST with Sawteeth, PPCD, OFCD, pellets, etc. MHD stability studies: B ~ Jrt (, ) B Extract information from all chords Core transport nb, r J Br Core dynamo studies: ~ ~ ~ θ r v B ~ ~ φ r v B toroidal electric field poloidal electric field
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 informationFaraday Effect Measurement of Internal Magnetic Field and Fluctuations in C-MOD
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
More informationDifferential 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 informationA 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 informationParticle 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 informationCurrent Profile Control by ac Helicity Injection
Current Profile Control by ac Helicity Injection Fatima Ebrahimi and S. C. Prager University of Wisconsin- Madison APS 2003 Motivations Helicity injection is a method to drive current in plasmas in which
More informationElectron 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 informationAC loop voltages and MHD stability in RFP plasmas
AC loop voltages and MHD stability in RFP plasmas K. J. McCollam, D. J. Holly, V. V. Mirnov, J. S. Sar, D. R. Stone UW-Madison 54rd Annual Meeting of the APS-DPP October 29th - November 2nd, 2012 Providence,
More informationMo#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 informationOscillating 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 informationEvaluation 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 informationDIAGNOSTICS 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 informationReduction of fluctuations and edge current during PPCD in MST. B. E. Chapman and the MST group
Reduction of fluctuations and edge current during PPCD in MST B. E. Chapman and the MST group Outline -- The key to sustained fluctuation reduction during PPCD -- Magnetic fluctuations (including single
More informationTomographic 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 informationProgress 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 informationCONFINEMENT IN THE RFP: LUNDQUIST NUMBER SCALING, PLASMA FLOW, AND REDUCED TRANSPORT
CONFINEMENT IN THE RFP: LUNDQUIST NUMBER SCALING, PLASMA FLOW, AND REDUCED TRANSPORT G. Fiksel, 1 A.F. Almagri, 1 J.K. Anderson, 1 T.M. Biewer, 1 D.L. Brower, 2 C-S. Chiang, 1 B.E. Chapman, 1 J.T. Chapman,
More informationAdvanced 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 informationA 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 informationToroidal 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 informationCharacterization 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 informationCurrent 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 informationOscillating-Field Current-Drive Experiment on MST
Oscillating-Field Current-Drive Experiment on MST K. J. McCollam, J. K. Anderson, D. J. Den Hartog, F. Ebrahimi, J. A. Reusch, J. S. Sarff, H. D. Stephens, D. R. Stone University of Wisconsin-Madison D.
More informationMomentum 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 informationTwo Fluid Dynamo and Edge-Resonant m=0 Tearing Instability in Reversed Field Pinch
1 Two Fluid Dynamo and Edge-Resonant m= Tearing Instability in Reversed Field Pinch V.V. Mirnov 1), C.C.Hegna 1), S.C. Prager 1), C.R.Sovinec 1), and H.Tian 1) 1) The University of Wisconsin-Madison, Madison,
More informationEffect of ideal kink instabilities on particle redistribution
Effect of ideal kink instabilities on particle redistribution H. E. Ferrari1,2,R. Farengo1, P. L. Garcia-Martinez2, M.-C. Firpo3, A. F. Lifschitz4 1 Comisión Nacional de Energía Atómica, Centro Atomico
More informationEX/4-6Rb Electrostatic fluctuation and fluctuation-induced particle flux during formation of the edge transport barrier in the JFT-2M tokamak
Electrostatic fluctuation and fluctuation-induced particle flux during formation of the edge transport barrier in the JFT-2M tokamak T. Ido 1), Y. Miura 2), K. Hoshino 2), Y. Hamada 1), Y. Nagashima 1),
More informationThe 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 informationCurrent 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 informationFast Ion Confinement in the MST Reversed Field Pinch
Fast Ion Connement in the MST Reversed Field Pinch Gennady Fiksel B. Hudson, D.J. Den Hartog, R.M. Magee, R. O'Connell, S.C. Prager MST Team - University of Wisconsin - Madison Center for Magnetic Self-Organization
More informationFormation 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 informationSUMMARY OF EXPERIMENTAL CORE TURBULENCE CHARACTERISTICS IN OH AND ECRH T-10 TOKAMAK PLASMAS
SUMMARY OF EXPERIMENTAL CORE TURBULENCE CHARACTERISTICS IN OH AND ECRH T-1 TOKAMAK PLASMAS V. Vershkov, L.G. Eliseev, S.A. Grashin. A.V. Melnikov, D.A. Shelukhin, S.V. Soldatov, A.O. Urazbaev and T-1 team
More informationPlasma Flow in MST: Effects of Edge Biasing and Momentum Transport from Nonlinear Magnetic Torques
Plasma Flow in MST: Effects of Edge Biasing and Momentum Transport from Nonlinear Magnetic Torques J.S. Sarff, A.F. Almagri, J.K. Anderson, B.E. Chapman, D. Craig, C-S. Chiang, N.A. Crocker, D.J. Den Hartog,
More informationPhase 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 informationMeasurement of magnetic fluctuation-induced heat transport in tokamaks and RFP
Plasma Phys. Control. Fusion 38 (1996) A213 A225. Printed in the UK Measurement of magnetic fluctuation-induced heat transport in tokamaks and RFP G Fiksel, Roger D Bengtson, M Cekic, D Den Hartog, S C
More informationInitial 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 informationThe Linear Theory of Tearing Modes in periodic, cyindrical plasmas. Cary Forest University of Wisconsin
The Linear Theory of Tearing Modes in periodic, cyindrical plasmas Cary Forest University of Wisconsin 1 Resistive MHD E + v B = ηj (no energy principle) Role of resistivity No frozen flux, B can tear
More informationMST 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 informationMeasurement of core velocity fluctuations and the
Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch D. J. Den Hartog 1, J. T. Chapman 2, D. Craig, G. Fiksel, P. W. Fontana, S. C. Prager, and J. S. Sarff Department of Physics,
More informationStudy 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 informationNIMROD 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 informationchannel 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 informationStudies of H Mode Plasmas Produced Directly by Pellet Injection in DIII D
Studies of H Mode Plasmas Produced Directly by Pellet Injection in by P. Gohil in collaboration with L.R. Baylor,* K.H. Burrell, T.C. Jernigan,* G.R. McKee, *Oak Ridge National Laboratory University of
More informationBehavior of Compact Toroid Injected into the External Magnetic Field
Behavior of Compact Toroid Injected into the External Magnetic Field M. Nagata 1), N. Fukumoto 1), H. Ogawa 2), T. Ogawa 2), K. Uehara 2), H. Niimi 3), T. Shibata 2), Y. Suzuki 4), Y. Miura 2), N. Kayukawa
More informationSimulations 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 informationNon-Solenoidal Plasma Startup in
Non-Solenoidal Plasma Startup in the A.C. Sontag for the Pegasus Research Team A.C. Sontag, 5th APS-DPP, Nov. 2, 28 1 Point-Source DC Helicity Injection Provides Viable Non-Solenoidal Startup Technique
More informationEdge 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 informationDerivation 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 informationQuantum enhanced magnetometer and squeezed state of light tunable filter
Quantum enhanced magnetometer and squeezed state of light tunable filter Eugeniy E. Mikhailov The College of William & Mary October 5, 22 Eugeniy E. Mikhailov (W&M) Squeezed light October 5, 22 / 42 Transition
More informationTHE 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 informationEFFECT 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 informationObservation 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 informationHeat 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 informationPlasma 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 informationTurbulence 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 informationMagnetic Self-Organization in the RFP
Magnetic Self-Organization in the RFP Prof. John Sarff University of Wisconsin-Madison Joint ICTP-IAEA College on Plasma Physics ICTP, Trieste, Italy Nov 7-18, 2016 The RFP plasma exhibits a fascinating
More informationINTERFEROMETER 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 informationEffect of ECRH Regime on Characteristics of Short-Wave Turbulence in Plasma of the L-2M Stellarator
1 Effect of ECRH Regime on Characteristics of Short-Wave Turbulence in Plasma of the L-2M Stellarator N.N. Skvortsova, D.K. Akulina, G.M. Batanov, G.S. Voronov, L.V. Kolik, L.M. Kovrizhnykh, A.A. Letunov,
More informationReduction 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 informationAbstract. 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 informationPedestals and Fluctuations in C-Mod Enhanced D α H-modes
Pedestals and Fluctuations in Enhanced D α H-modes Presented by A.E.Hubbard With Contributions from R.L. Boivin, B.A. Carreras 1, S. Gangadhara, R. Granetz, M. Greenwald, J. Hughes, I. Hutchinson, J. Irby,
More information3-D Random Reconnection Model of the Sawtooth Crash
3-D Random Reconnection Model of the Sawtooth Crash Hyeon K. Park Princeton Plasma PhysicsN Laboratory Princeton University at IPELS, 2007 Cairns, Australia August 5-9, 2007 Collaboration with N.C. Luhmann,
More informationFirst 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 informationInternal 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 informationCalculation of alpha particle redistribution in sawteeth using experimentally reconstructed displacement eigenfunctions
Calculation of alpha particle redistribution in sawteeth using experimentally reconstructed displacement eigenfunctions R. Farengo, H. E. Ferrari,2, M.-C. Firpo 3, P. L. Garcia-Martinez 2,3, A. F. Lifschitz
More informationLarge 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 informationMagnetic Fluctuation-Induced Particle Transport. and Zonal Flow Generation in MST
Magnetic Fluctuation-Induced Paticle Tanspot and Zonal Flow Geneation in MST D.L. Bowe Weixing Ding, B.H. Deng Univesity of Califonia, Los Angeles, USA D. Caig, G. Fiksel, V. Minov, S.C. Page, J. Saff
More informationThe 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 informationRelating the L-H Power Threshold Scaling to Edge Turbulence Dynamics
Relating the L-H Power Threshold Scaling to Edge Turbulence Dynamics Z. Yan 1, G.R. McKee 1, J.A. Boedo 2, D.L. Rudakov 2, P.H. Diamond 2, G. Tynan 2, R.J. Fonck 1, R.J. Groebner 3, T.H. Osborne 3, and
More informationTokamak-like confinement at a high beta and low toroidal field in the MST reversed field pinch*
INSTITUTE OF PHYSICS PUBLISHING and INTERNATIONAL ATOMIC ENERGY AGENCY NUCLEAR FUSION Nucl. Fusion 43 (23) 1684 1692 PII: S29-5515(3)7949-1 Tokamak-like confinement at a high beta and low toroidal field
More informationThe role of stochastization in fast MHD phenomena on ASDEX Upgrade
1 EX/P9-10 The role of stochastization in fast MHD phenomena on ASDEX Upgrade V. Igochine 1), O.Dumbrajs 2,3), H. Zohm 1), G. Papp 4), G. Por 4), G. Pokol 4), ASDEX Upgrade team 1) 1) MPI für Plasmaphysik,
More informationConnections between Particle Transport and Turbulence Structures in the Edge and SOL of Alcator C-Mod
Connections between Particle Transport and Turbulence Structures in the Edge and SOL of Alcator C-Mod I. Cziegler J.L. Terry, B. LaBombard, J.W. Hughes MIT - Plasma Science and Fusion Center th 19 Plasma
More informationPlasma 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 informationAdditional Heating Experiments of FRC Plasma
Additional Heating Experiments of FRC Plasma S. Okada, T. Asai, F. Kodera, K. Kitano, T. Suzuki, K. Yamanaka, T. Kanki, M. Inomoto, S. Yoshimura, M. Okubo, S. Sugimoto, S. Ohi, S. Goto, Plasma Physics
More informationCharacterization 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 informationPhysics of the Current Injection Process in Localized Helicity Injection
Physics of the Current Injection Process in Localized Helicity Injection Edward Thomas Hinson Pegasus Toroidal Experiment University of Wisconsin Madison 57 th American Physical Society Division of Plasma
More informationThe 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 informationUnderstanding Turbulence is a Grand Challenge
The Turbulent Structure of a Plasma Confined by a Magnetic Dipole B. A. Grierson M.W. Worstell, M.E. Mauel ICC 28 Reno, NV 1 Understanding Turbulence is a Grand Challenge Ubiquitous in natural and laboratory
More informationIon Temperature Measurements in the
Ion Temperature Measurements in the PEGASUS Toroidal Experiment M.G. Burke, M.W. Bongard, R.J. Fonck, D.J. Schlossberg, A.J. Redd 52 nd Annual APS-DPP University of Wisconsin-Madison Chicago, IL November
More informationRESISTIVE WALL MODE STABILIZATION RESEARCH ON DIII D STATUS AND RECENT RESULTS
RESISTIVE WALL MODE STABILIZATION RESEARCH ON STATUS AND RECENT RESULTS by A.M. Garofalo1 in collaboration with J. Bialek,1 M.S. Chance,2 M.S. Chu,3 T.H. Jensen,3 L.C. Johnson,2 R.J. La Haye,3 G.A. Navratil,1
More informationReduction 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 informationThe Role of Dynamo Fluctuations in Anomalous Ion Heating, Mode Locking, and Flow Generation
The Role of Dynamo Fluctuations in Anomalous Ion Heating, Mode Locking, and Flow Generation P. W. Terry 1), R. Gatto 1), R. Fitzpatrick 2), C.C. Hegna 3), and G. Fiksel 1) 1) Department of Physics, University
More informationD.J. Schlossberg, D.J. Battaglia, M.W. Bongard, R.J. Fonck, A.J. Redd. University of Wisconsin - Madison 1500 Engineering Drive Madison, WI 53706
D.J. Schlossberg, D.J. Battaglia, M.W. Bongard, R.J. Fonck, A.J. Redd University of Wisconsin - Madison 1500 Engineering Drive Madison, WI 53706 Concept Overview Implementation on PEGASUS Results Current
More informationSawteeth in Tokamaks and their relation to other Two-Fluid Reconnection Phenomena
Sawteeth in Tokamaks and their relation to other Two-Fluid Reconnection Phenomena S. C. Jardin 1, N. Ferraro 2, J. Chen 1, et al 1 Princeton Plasma Physics Laboratory 2 General Atomics Supported by the
More informationExperimental Study of Hall Effect on a Formation Process of an FRC by Counter-Helicity Spheromak Merging in TS-4 )
Experimental Study of Hall Effect on a Formation Process of an FRC by Counter-Helicity Spheromak Merging in TS-4 ) Yasuhiro KAMINOU, Michiaki INOMOTO and Yasushi ONO Graduate School of Engineering, The
More informationExperimental 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 informationRequirements for Active Resistive Wall Mode (RWM) Feedback Control
Requirements for Active Resistive Wall Mode (RWM) Feedback Control Yongkyoon In 1 In collaboration with M.S. Chu 2, G.L. Jackson 2, J.S. Kim 1, R.J. La Haye 2, Y.Q. Liu 3, L. Marrelli 4, M. Okabayashi
More informationEquilibrium Evolution in the ZaP Flow Z-Pinch
Equilibrium Evolution in the ZaP Flow Z-Pinch U. Shumlak, B.A. Nelson, C.S. Adams, D.J. Den Hartog, R.P. Golingo, S. L. Jackson, S.D. Knecht, J. Pasko, and D.T. Schmuland University of Washington, Seattle
More informationIon energy balance during fast wave heating in TORE SUPRA
Ion energy balance during fast wave heating in TORE SUPRA Thierry Hutter, Alain Bécoulet, Jean-Pierre Coulon, Vincent Saoutic, Vincent Basiuk, G.T. Hoang To cite this version: Thierry Hutter, Alain Bécoulet,
More informationThe Levitated Dipole Experiment: Experiment and Theory
The Levitated Dipole Experiment: Experiment and Theory Jay Kesner, R. Bergmann, A. Boxer, J. Ellsworth, P. Woskov, MIT D.T. Garnier, M.E. Mauel Columbia University Columbia University Poster CP6.00083
More informationECH Density Pumpout and Small Scale Turbulence in DIII-D
ECH Density Pumpout and Small Scale Turbulence in DIII-D By K.L. Wong, T.L. Rhodes, R. Prater, R. Jayakumar, R. Budny, C.C. Petty, R. Nazikian, and W.A. Peebles Background It has been known for more than
More informationMeasurement of core velocity fluctuations and the dynamo in a reversed-field pinch*
PHYSICS OF PLASMAS VOLUME 6, NUMBER 5 MAY 1999 Measurement of core velocity fluctuations and the dynamo in a reversed-field pinch* D. J. Den Hartog,,a) J. T. Chapman, b) D. Craig, G. Fiksel, P. W. Fontana,
More informationLecture # 3. Introduction to Kink Modes the Kruskal- Shafranov Limit.
Lecture # 3. Introduction to Kink Modes the Kruskal- Shafranov Limit. Steve Cowley UCLA. This lecture is meant to introduce the simplest ideas about kink modes. It would take many lectures to develop the
More informationLower 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 informationNonsolenoidal 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 informationNonlinear 3D MHD physics of the helical reversed-field pinch
Nonlinear 3D MHD physics of the helical reversed-field pinch Daniele Bonfiglio* Consorzio RFX, Euratom-ENEA Association, Padova, Italy *In collaboration with: S. Cappello, L. Chacón (Oak Ridge National
More informationOverview of the RFX-mod Fusion Science Program P. Martin, M.E. Puiatti and the RFX Team & Collaborators
Overview of the RFX-mod Fusion Science Program P. Martin, M.E. Puiatti and the RFX Team & Collaborators Overview of Results from the MST Reversed Field Pinch Experiment J. Sarff and the MST Team & Collaborators!
More informationMeasurements of Core Electron Temperature Fluctuations in DIII-D with Comparisons to Density Fluctuations and Nonlinear GYRO Simulations
Measurements of Core Electron Temperature Fluctuations in DIII-D with Comparisons to Density Fluctuations and Nonlinear GYRO Simulations A.E. White,a) L. Schmitz,a) G.R. McKee,b) C. Holland,c) W.A. Peebles,a)
More informationEdge Zonal Flows and Blob Propagation in Alcator C-Mod P5.073 EPS 2011
Edge Zonal Flows and Blob Propagation in Alcator C-Mod S.J. Zweben 1, J.L. Terry 2, M. Agostini 3, B. Davis 1, O. Grulke 4,J. Hughes 2, B. LaBombard 2 D.A. D'Ippolito 6, R. Hager 5, J.R. Myra 6, D.A. Russell
More informationCurrent-driven instabilities
Current-driven instabilities Ben Dudson Department of Physics, University of York, Heslington, York YO10 5DD, UK 21 st February 2014 Ben Dudson Magnetic Confinement Fusion (1 of 23) Previously In the last
More informationDouble Null Merging Start-up Experiments in the University of Tokyo Spherical Tokamak
1 EXS/P2-19 Double Null Merging Start-up Experiments in the University of Tokyo Spherical Tokamak T. Yamada 1), R. Imazawa 2), S. Kamio 1), R. Hihara 1), K. Abe 1), M. Sakumura 1), Q. H. Cao 1), H. Sakakita
More information