Lower Hybrid Wave Induced Rotation on Alcator C-Mod* Ron Parker, Yuri Podpaly, John Rice, Andréa Schmidt
|
|
- Barry Augustus Marshall
- 5 years ago
- Views:
Transcription
1 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
2 Abstract Injection of RF power in the vicinity of the lower hybrid frequency has been observed to cause strong counter current rotation in Alcator C-Mod plasmas[1,]. The spin-up rate is consistent with the rate at which momentum is injected by the LH waves, and also the rate at which fast electron momentum is transferred to the ions. A momentum diffusivity of ~.1 m^/s is sufficient to account for the observed steady-state rotation. This value is also comparable with that derived from an analysis of rotation induced by RF mode conversion. Radial force balance requires a radial electric field, suggesting a buildup of negative charge in the plasma core. This may be the result of an inward pinch of the LH produced fast electrons, as would be expected for resonant trapped particles. Analysis of the fastelectron-produced bremsstrahlung during LH power modulation experiments yields an inward pinch velocity of ~ 1 m/s, consistent with the estimated trapped particle pinch velocity. [1.] A. Ince-Cushman, et.al., Phys. Rev. Lett., 1, 35 (9) [.] J. E. Rice, et. al., Nucl. Fusion 9, 5 (9)
3 Examples of discharges with substantial LH-induced counter rotation MA I p.5 V Vl n = 1.9 n = 1. MA I p.5 V Vl MW 1 19 /m <n e > T e () LH T rad t (s) MW 1 19 /m <n e > T e () LH T rad t (s) Discharge in right panel has stronger current drive, current profile modification. MHD activity occurs at t = s in this discharge, affecting profile evolution
4 These discharges have q()>1 and are sawtooth stabilized Ohmic Behavior of central q and internal Inductance (from EFIT) are consistent with broadening of j φ profile. n ll =1.95 Time(s) l i J φ (MA/m ) 1 n ll =1.5 R(m) Time(s) For EFIT reconstruction P and FF are modeled by - and 3- term polynomials, respectively, and poloidal field on mid-plane is constrained by MSE measurements. Any structure in j φ (R) is smoothed by this approach.
5 km/s Spatial profiles show LH-driven counter rotation is localized to core V - Tor n = V.5 V l Time MW. 1 8 LH T rad t (s) Rotation overshoots at beginning and end of LH pulse V tor (km/s) Time (t =.9) Central rotation increases after turnoff Of LH power See also shot (t = 1.199)
6 km/s V Rotation increases with lower n ll, but MHD activity develops and clamps rotation V Tor V l n = 1. Time MW. 1 8 LH T rad t (s) Lower n ll is more effective at current profile modification, drives central q > 1 Time ( t =.9) (t=.935)
7 Instability is a virulent m=, n=1 mode q = location (?) (t=.935) Rotation rapidly slows as instability grows Assuming mode frequency tracks rotation velocity, i.e., ω ~ k V tor at resonant position, location can be identified corresponding to q= r r
8 MSE signals show response to LH current drive, MHD = 1. instability for n MA MW I p.5 V Vl 1 19 /m <n e > T e () LH T rad t (s) Arctan(B v /B φ ) (degrees) Time(s) MSE traces at various major radii for shots with MHD. Onset of MHD activity modifies MSE profile.
9 After LH, rotation transiently redevelops, then decays km/s - - V Tor V MW LH V l T rad t (s) V tor (km/s) Time Time (t= 1.11) Recovery after LH pulse suggests a role for internal electric field and/or fast Electrons. (t= 1.5)
10 Rate of injected wave and particle momentum is sufficient to explain plasma momentum buildup Rate of toroidal momentum buildup in plasma: P& ϕ = minv& ϕ Vol =.x1 3 N Rate of momentum injected by wave 1 : P& ϕ r 1 r = da sk r ˆ ϕ = ω =. 7x1 3 N n ϕ c da W r v g ˆ ϕ = n ϕ c Power Rate at which fast current carrying electrons lose momentum: P& ϕ = πr dam ( nv) fast πrmei = = 5.7x1 τ eτ e 3 SD 1 A. Bers in Plasma Physics Les Houches 197, G. DeWitt and J. Peyraud, eds, Gordon and Breach(1975) SD N
11 Wave momentum transferred to trapped electrons also results in inward pinch d dt Δψ δr v r ( mr 1 en B t & φ eψ ) ψ = r p dp dt ϕ = ere RE ϕ ϕ dt TR e dp dt ϕ v r.7 Numerically, m/s (inward) Buildup of negative charge in core would result in a radial electric field, which through radial force balance requires toroidal rotation
12 A hard x-ray camera measures fast electron bremsstrahlung resolved in time, space & energy C-Mod Cross Section J. Liptac, RSI, 77, 135 () HXR Diagnostic a c =5 mm a d =5 mm 3 chords ~ 1 cm spatial resolution ~ 1 µs time resolution D=13 cm d= cm Post-processing of raw pulse train for pulse height analysis and time/energy binning
13 Analysis of modulated bremsstrahlung emission yields evidence for inward pinch of fast electrons LH pulse is square-wave modulated and Bremsstrahlung is sorted into time and and energy bins emissivity (counts/(mm 3 str s)) PLH (t) x 1 5 ms Scan across plasma vertical cross-section t Inversion Example. 1 sqrt(ψ t ) ~ r/a Model for fast electron density, n(r,t,e): n n = + ( D n) ( nv) + S t τ By comparing buildup and decay with this diffusion-pinch model, a pinch velocity can be backed out: v (m/s) HXR Energy ()
14 In low density H-modes, LH Waves modify pedestal P ICRF (MW) W MHD (kj) Te, () 1. Te, r/a~ V surf (V) n e (1 m -3 ) P rad (MW) P LH (MW) time (s) Pedestal density decreases, profile broadens Pedestal temperature increases, leading to increased temperature and stored energy (a) (b) (c) (d) (e) (f) (g) n e (1 m -3 ) T e () p e (kpa) Edge pedestal: LH off / LH on LH ON LH ON R - R LCFS (mm) Jerry Hughes, B13.
15 and edge rotation, which propagates to core. P LH ΔVφ (km/s) ΔVφ (km/s) Line-integrated density Pedestal & near SOL density Pedestal toroidal rotation change (B + ) Central toroidal rotation change (Ar +1 ) Pedestal rotation change occurs before change in core rotation LH also increases SOL density, decreases density in pedestal and core SOL density profile broadens These H-modes will be a focus for LHCD studies in the next campaign
16 The LH induced rotation appears to be additive to ICRF induced rotation
17 Summary Injection of Lower Hybrid Waves into Alcator C-Mod plasmas generates strong counter rotation in core Injected wave momentum is sufficient to account for momentum buildup, but mechanism for generation of momentum is unclear, in particular role of radial electric field Analysis of hard X-Ray bremsstrahlung suggests a pinch mechanism for fast electrons, supporting development of negative radial electric field and counter-rotation In higher density H-Modes Lower Hybrid Waves affect edge, resulting in pedestal density relaxation and edge counter rotation which reduces ICRF induced co-rotation in core.
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 informationLower Hybrid Current Drive Experiments on Alcator C-Mod: Comparison with Theory and Simulation
Lower Hybrid Current Drive Experiments on Alcator C-Mod: Comparison with Theory and Simulation P.T. Bonoli, A. E. Hubbard, J. Ko, R. Parker, A.E. Schmidt, G. Wallace, J. C. Wright, and the Alcator C-Mod
More informationObservations 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 informationRecent 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 informationLower Hybrid RF: Results, Goals and Plans. J.R. Wilson Alcator C-Mod Program Advisory Meeting January 27, 2010
Lower Hybrid RF: Results, Goals and Plans J.R. Wilson Alcator C-Mod Program Advisory Meeting January 27, 2010 ITER Needs and the RENEW Report Provide a Context for LH Research on C-Mod ITER Needs: Hea-ng
More informationOverview of Tokamak Rotation and Momentum Transport Phenomenology and Motivations
Overview of Tokamak Rotation and Momentum Transport Phenomenology and Motivations Lecture by: P.H. Diamond Notes by: C.J. Lee March 19, 2014 Abstract Toroidal rotation is a key part of the design of ITER
More informationOVERVIEW 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 informationITB Transport Studies in Alcator C-Mod. Catherine Fiore MIT Plasma Science and Fusion Center Transport Task Force March 26th Boulder, Co
Transport Studies in Alcator C-Mod Catherine Fiore MIT Plasma Science and Fusion Center Transport Task Force March 26th Boulder, Co With Contributions from: I. Bespamyatnov, P. T. Bonoli*, D. Ernst*, M.
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 informationSpontaneous Core Toroidal Rotation in Alcator C- Mod L-Mode, H-Mode and ITB Plasmas.
PSFC/JA-8-11 Spontaneous Core Toroidal Rotation in Alcator C- Mod L-Mode, H-Mode and ITB Plasmas. Rice, J.E.; Ince-Cushman, A.C.; Reinke, M.L.; Podpaly, Y.; Greenwald, M.J.; LaBombard, B.S.; Marmar, E.S.
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 informationEXC/P2-02. Experiments and Simulations of ITER-like Plasmas in Alcator C-Mod
EXC/P2-02 Experiments and Simulations of ITER-like Plasmas in Alcator C-Mod J. R. Wilson 1, C. E. Kessel 1, S. Wolfe 2, I. Hutchinson 2, P. Bonoli 2, C. Fiore 2, A. Hubbard 2, J. Hughes 2, Y. Lin 2, Y.
More informationSpontaneous tokamak rotation: observations turbulent momentum transport has to explain
Spontaneous tokamak rotation: observations turbulent momentum transport has to explain Ian H Hutchinson Plasma Science and Fusion Center and Nuclear Science and Engineering Massachusetts Institute of Technology
More informationICRF Mode Conversion Flow Drive on Alcator C-Mod and Projections to Other Tokamaks
ICRF Mode Conversion Flow Drive on Alcator C-Mod and Projections to Other Tokamaks Y. Lin, J.E. Rice, S.J. Wukitch, M.J. Greenwald, A.E. Hubbard, A. Ince- Cushman, L. Lin, E.S. Marmar, M. Porkolab, M.L.
More informationFull-wave Simulations of Lower Hybrid Wave Propagation in the EAST Tokamak
Full-wave Simulations of Lower Hybrid Wave Propagation in the EAST Tokamak P. T. BONOLI, J. P. LEE, S. SHIRAIWA, J. C. WRIGHT, MIT-PSFC, B. DING, C. YANG, CAS-IPP, Hefei 57 th Annual Meeting of the APS
More informationStudy of B +1, B +4 and B +5 impurity poloidal rotation in Alcator C-Mod plasmas for 0.75 ρ 1.0.
Study of B +1, B +4 and B +5 impurity poloidal rotation in Alcator C-Mod plasmas for 0.75 ρ 1.0. Igor Bespamyatnov, William Rowan, Ronald Bravenec, and Kenneth Gentle The University of Texas at Austin,
More informationImproved RF Actuator Schemes for the Lower Hybrid and the Ion Cyclotron Range of Frequencies in Reactor-Relevant Plasmas
Improved RF Actuator Schemes for the Lower Hybrid and the Ion Cyclotron Range of Frequencies in Reactor-Relevant Plasmas P. T. Bonoli*, S. G. Baek, B. LaBombard, K. Filar, M. Greenwald, R. Leccacorvi,
More informationICRF Minority-Heated Fast-Ion Distributions on the Alcator C-Mod: Experiment and Simulation
ICRF Minority-Heated Fast-Ion Distributions on the Alcator C-Mod: Experiment and Simulation A. Bader 1, P. Bonoli 1, R. Granetz 1, R.W. Harvey 2, E.F. Jaeger 3, R. Parker 1, S. Wukitch 1. 1)MIT-PSFC, Cambridge,
More informationDirect 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 informationTheory Work in Support of C-Mod
Theory Work in Support of C-Mod 2/23/04 C-Mod PAC Presentation Peter J. Catto for the PSFC theory group MC & LH studies ITB investigations Neutrals & rotation BOUT improvements TORIC ICRF Mode Conversion
More informationEnhanced Energy Confinement Discharges with L-mode-like Edge Particle Transport*
Enhanced Energy Confinement Discharges with L-mode-like Edge Particle Transport* E. Marmar, B. Lipschultz, A. Dominguez, M. Greenwald, N. Howard, A. Hubbard, J. Hughes, B. LaBombard, R. McDermott, M. Reinke,
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 informationTRANSPORT 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 informationTime Dependent evolution of RF-generated non-thermal particle distributions in fusion plasmas
Time Dependent evolution of RF-generated non-thermal particle distributions in fusion plasmas John C. Wright 1 J.P. Lee 1 P. T. Bonoli 1 A.E. Schmidt 1 and E.J. Valeo 2 1 Plasma Science and Fusion Center
More informationLight Impurity Transport Studies in Alcator C-Mod*
Light Impurity Transport Studies in Alcator C-Mod* I. O. Bespamyatnov, 1 W. L. Rowan, 1 C. L. Fiore, 2 K. W. Gentle, 1 R. S. Granet, 2 and P. E. Phillips 1 1 Fusion Research Center, The University of Texas
More informationDependence of non-local effects on plasma parameters during cold-pulse experiments in Alcator C-Mod
Dependence of non-local effects on plasma parameters during cold-pulse experiments in Alcator C-Mod P. Rodriguez-Fernandez 1, N.M. Cao 1, A. Creely 1, M. Greenwald 1, S. Houshmandyar 2, N.T. Howard 1,
More informationTime-domain simulation and benchmark of LHCD experiment at ITER relevant parameters
Time-domain simulation and benchmark of LHCD experiment at ITER relevant parameters S. Shiraiwa, P. Bonoli, F. Poli 1, R. W, Harvey 2, C. Kessel 1, R. Parker, and G. Wallace MIT-PSFC, PPPL 1, and CompX
More information2017 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 informationEffects of fast ion phase space modifications by instabilities on fast ion modeling
Effects of fast ion phase space modifications by instabilities on fast ion modeling M. Podestà, M. Gorelenkova, E. Fredrickson, N. Gorelenkov, R. White PPPL, Princeton USA Acknowledgements: NSTX-U and
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 informationICRF 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 informationNon-local Heat Transport in Alcator C-Mod Ohmic L-mode Plasmas
Non-local Heat Transport in Alcator C-Mod Ohmic L-mode Plasmas C. Gao 1, J.E.Rice 1, H.J. Sun 2,3, M.L.Reinke 1, N.T.Howard 1, D. Mikkelson 4, A.E.Hubbard 1, M.Chilenski 1, J.R.Walk 1, J.W.Hughes 1, P.Ennever
More informationGA A25853 FAST ION REDISTRIBUTION AND IMPLICATIONS FOR THE HYBRID REGIME
GA A25853 FAST ION REDISTRIBUTION AND IMPLICATIONS FOR THE HYBRID REGIME by R. NAZIKIAN, M.E. AUSTIN, R.V. BUDNY, M.S. CHU, W.W. HEIDBRINK, M.A. MAKOWSKI, C.C. PETTY, P.A. POLITZER, W.M. SOLOMON, M.A.
More informationInvestigation 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 informationIntegrated modeling of LHCD non- induc6ve scenario development on Alcator C- Mod
Integrated modeling of LHCD non- induc6ve scenario development on Alcator C- Mod S. Shiraiwa, P. Bonoli, R. Parker, F. Poli 1, G. Wallace, and J, R. Wilson 1 PSFC, MIT and 1 PPPL 40th European Physical
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 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 Non-solenoidal startup using point-source DC helicity injectors
More informationOhmic and RF Heated ITBs in Alcator C-Mod
Ohmic and RF Heated s in Alcator C-Mod William L. Rowan, Igor O. Bespamyatnov Fusion Research Center, The University of Texas at Austin C.L. Fiore, A. Dominguez, A.E. Hubbard, A. Ince-Cushman, M.J. Greenwald,
More informationRole 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 informationLocalized Electron Cyclotron Current Drive in DIII D: Experiment and Theory
Localized Electron Cyclotron Current Drive in : Experiment and Theory by Y.R. Lin-Liu for C.C. Petty, T.C. Luce, R.W. Harvey,* L.L. Lao, P.A. Politzer, J. Lohr, M.A. Makowski, H.E. St John, A.D. Turnbull,
More informationH-mode performance and pedestal studies with enhanced particle control on Alcator C-Mod
H-mode performance and pedestal studies with enhanced particle control on Alcator C-Mod J.W. Hughes, B. LaBombard, M. Greenwald, A. Hubbard, B. Lipschultz, K. Marr, R. McDermott, M. Reinke, J.L. Terry
More informationC-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 informationDOPPLER RESONANCE EFFECT ON ROTATIONAL DRIVE BY ION CYCLOTRON MINORITY HEATING
DOPPLER RESONANCE EFFECT ON ROTATIONAL DRIVE BY ION CYCLOTRON MINORITY HEATING V.S. Chan, S.C. Chiu, Y.A. Omelchenko General Atomics, San Diego, CA, U.S.A. 43rd Annual APS Division of Plasma Physics Meeting
More informationAbsorption of lower hybrid waves in the scrape off layer of a diverted tokamak
PSFC/JA-1-1 Absorption of lower hybrid waves in the scrape off layer of a diverted tokamak Wallace, G.M, Parker, R.R., Bonoli, P.T., Harvey, R.W.*, Hubbard, A.E., Hughes, J.W., LaBombard, B.L., Meneghini,
More informationOverview of Recent Results from Alcator C-Mod including Applications to ITER Scenarios
Overview of Recent Results from Alcator C-Mod including Applications to ITER Scenarios E. S. Marmar and the Alcator C-Mod Team MIT Plasma Science and Fusion Center, Cambridge MA 02139 USA E-mail contact
More informationEXD/P3-13. Dependences of the divertor and midplane heat flux widths in NSTX
1 Dependences of the ertor and plane heat flux widths in NSTX T.K. Gray1,2), R. Maingi 2), A.G. McLean 2), V.A. Soukhanovskii 3) and J-W. Ahn 2) 1) Oak Ridge Institute for Science and Education (ORISE),
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 informationOn the ρ Scaling of Intrinsic Rotation in C-Mod Plasmas with Edge Transport Barriers
On the ρ Scaling of Intrinsic Rotation in C-Mod Plasmas with Edge Transport Barriers J.E. Rice, J.W. Hughes, P.H. Diamond, N. Cao, M.A. Chilenski, A.E. Hubbard, J.H. Irby, Y. Kosuga Y. Lin, I.W. Metcalf,
More informationReduction 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 informationPoloidal Variation of High-Z Impurity Density in ICRF- Heated Alcator C-Mod Plasmas
Poloidal Variation of High-Z Impurity Density in ICRF- Heated Alcator C-Mod Plasmas M.L. Reinke, I.H. Hutchinson, J.E. Rice, N.T. Howard, A. Bader, S. Wukitch, Y. Lin, D.C. Pace, A. Hubbard, J.W. Hughes
More informationTransport of Helium Impurity in Alcator C-Mod*
Transport of Helium Impurity in Alcator C-Mod* K. T. Liao, W. L. Rowan, I. O. Bespamyatnov, W. Horton, and X.R. Fu, R. Granetz, J. Hughes, Y. Ma, J. Walk Institute for Fusion Studies, The University of
More informationRadial impurity transport in the H mode transport barrier region in Alcator C-Mod
Radial impurity transport in the H mode transport barrier region in Alcator C-Mod T. Sunn Pedersen, R.S. Granetz, A.E. Hubbard, I.H. Hutchinson, E.S. Marmar, J.E. Rice, J. Terry Plasma Science and Fusion
More informationAlcator C-Mod. Double Transport Barrier Plasmas. in Alcator C-Mod. J.E. Rice for the C-Mod Group. MIT PSFC, Cambridge, MA 02139
Alcator C-Mod Double Transport Barrier Plasmas in Alcator C-Mod J.E. Rice for the C-Mod Group MIT PSFC, Cambridge, MA 139 IAEA Lyon, Oct. 17, Outline Double Barrier Plasma Profiles and Modeling Conditions
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 informationGA A THERMAL ION ORBIT LOSS AND RADIAL ELECTRIC FIELD IN DIII-D by J.S. degrassie, J.A. BOEDO, B.A. GRIERSON, and R.J.
GA A27822 THERMAL ION ORBIT LOSS AND RADIAL ELECTRIC FIELD IN DIII-D by J.S. degrassie, J.A. BOEDO, B.A. GRIERSON, and R.J. GROEBNER JUNE 2014 DISCLAIMER This report was prepared as an account of work
More informationPower balance of Lower Hybrid Current Drive in the SOL of High Density Plasmas on Alcator C-Mod
Power balance of Lower Hybrid Current Drive in the SOL of High Density Plasmas on Alcator C-Mod I.C. Faust, G.M. Wallace, S.G. Baek, D. Brunner, B. LaBombard, R.R. Parker, Y. Lin, S. Shiraiwa, J.L. Terry,
More informationHeating and Current Drive by Electron Cyclotron Waves in JT-60U
EX/W- Heating and Current Drive by Electron Cyclotron Waves in JT-6U T. Suzuki ), S. Ide ), C. C. Petty ), Y. Ikeda ), K. Kajiwara ), A. Isayama ), K. Hamamatsu ), O. Naito ), M. Seki ), S. Moriyama )
More informationHard 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 informationOperational Phase Space of the Edge Plasma in Alcator C-Mod
Operational Phase Space of the Edge Plasma in B. LaBombard, T. Biewer, M. Greenwald, J.W. Hughes B. Lipschultz, N. Smick, J.L. Terry, Team Contributed talk RO.00008 Presented at the 47th Annual Meeting
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 informationBlob sizes and velocities in the Alcator C-Mod scrapeoff
P1-59 Blob sizes and velocities in the Alcator C-Mod scrapeoff layer R. Kube a,b,*, O. E. Garcia a,b, B. LaBombard b, J. L. Terry b, S. J. Zweben c a Department of Physics and Technology, University of
More informationDevelopment of LH wave fullwave simulation based on FEM
Development of LH wave fullwave simulation based on FEM S. Shiraiwa and O. Meneghini on behalf of LHCD group of Alacator C-Mod PSFC, MIT 2010/03/10 San-Diego, CA Special acknowledgements : R. Parker, P.
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 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 informationHIGH PERFORMANCE EXPERIMENTS IN JT-60U REVERSED SHEAR DISCHARGES
HIGH PERFORMANCE EXPERIMENTS IN JT-U REVERSED SHEAR DISCHARGES IAEA-CN-9/EX/ T. FUJITA, Y. KAMADA, S. ISHIDA, Y. NEYATANI, T. OIKAWA, S. IDE, S. TAKEJI, Y. KOIDE, A. ISAYAMA, T. FUKUDA, T. HATAE, Y. ISHII,
More informationTransport Improvement Near Low Order Rational q Surfaces in DIII D
Transport Improvement Near Low Order Rational q Surfaces in DIII D M.E. Austin 1 With K.H. Burrell 2, R.E. Waltz 2, K.W. Gentle 1, E.J. Doyle 8, P. Gohil 2, C.M. Greenfield 2, R.J. Groebner 2, W.W. Heidbrink
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 informationStudy of Current drive efficiency and its correlation with photon temperature in the HT-7 tokomak
Study of Current drive efficiency and its correlation with photon temperature in the HT-7 tokomak Dr. Jawad Younis Senior Scientist Pakistan Atomic Energy Commission, P. O. Box, 2151,Islamabad Institute
More informationFlow 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 informationSTATIONARY, HIGH BOOTSTRAP FRACTION PLASMAS IN DIII-D WITHOUT INDUCTIVE CURRENT CONTROL
th IAEA Fusion Energy Conference Vilamoura, Portugal, to 6 November IAEA-CN-6/EX/P-7 STATIONARY, HIGH BOOTSTRAP FRACTION PLASMAS IN DIII-D WITHOUT INDUCTIVE CURRENT CONTROL P.A. POLITZER, A.W. HYATT, T.C.
More informationElectron Transport and Improved Confinement on Tore Supra
Electron Transport and Improved Confinement on Tore Supra G. T. Hoang, C. Bourdelle, X. Garbet, T. Aniel, G. Giruzzi, M. Ottaviani. Association EURATOM-CEA. CEA-Cadarache, 38, St Paul-lez-Durance, France
More informationFull wave simulations of lower hybrid wave propagation in tokamaks
PSFC/JA-09-18 Full wave simulations of lower hybrid wave propagation in tokamaks J. C. Wright*, P. T. Bonoli*, C. K. Phillips, E. Valeo and R. W. Harvey** *MIT - Plasma Science and Fusion Center Cambridge,
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 informationPlasma 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 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 informationFormation and stability of impurity snakes in tokamak plasmas
PSFC/JA--9 Formation and stability of impurity snakes in tokamak plasmas L. Delgado-Aparicio,, L. Sugiyama, R. Granetz, J. Rice, Y. Podpaly, M. Reinke, D. Gates, P. Beirsdorfer 4, M. Bitter, S. Wolfe,
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 informationInfluence of Beta, Shape and Rotation on the H-mode Pedestal Height
Influence of Beta, Shape and Rotation on the H-mode Pedestal Height by A.W. Leonard with R.J. Groebner, T.H. Osborne, and P.B. Snyder Presented at Forty-Ninth APS Meeting of the Division of Plasma Physics
More informationProgress in Modeling of ARIES ACT Plasma
Progress in Modeling of ARIES ACT Plasma And the ARIES Team A.D. Turnbull, R. Buttery, M. Choi, L.L Lao, S. Smith, General Atomics H. St John, G. Staebler C. Kessel Princeton Plasma Physics Laboratory
More informationLow-collisionality density-peaking in GYRO simulations of C-Mod plasmas
Low-collisionality density-peaking in GYRO simulations of C-Mod plasmas D. R. Mikkelsen, M. Bitter, K. Hill, PPPL M. Greenwald, J.W. Hughes, J. Rice, MIT J. Candy, R. Waltz, General Atomics APS Division
More informationICRF Loading Studies on Alcator C-Mod
ICRF Loading Studies on Alcator C-Mod 46 th Annual Meeting of the APS Division of Plasma Physics November 15-19, 19, 2004 A. Parisot, S.J. S.J. Wukitch,, P. Bonoli,, J.W. Hughes, B. Labombard,, Y. Lin,
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 informationDensity Peaking At Low Collisionality on Alcator C-Mod
Density Peaking At Low Collisionality on Alcator C-Mod APS-DPP Meeting Philadelphia, 10/31/2006 M. Greenwald, D. Ernst, A. Hubbard, J.W. Hughes, Y. Lin, J. Terry, S. Wukitch, K. Zhurovich, Alcator Group
More informationICRF Induced Argon Pumpout in H-D Plasmas at Alcator C-Mod
0 ICRF Induced Argon Pumpout in H-D Plasmas at Alcator C-Mod C Gao J.E. Rice, M.L. Reinke, S.J. Wukitch, Y. Lin and Alcator C-Mod Team MIT-PSFC October 29, 2014 C Gao etc., MIT-PSFC 56th APS-DPP New Orleans,
More informationExperimental 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 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 informationCharacteristics of Internal Transport Barrier in JT-60U Reversed Shear Plasmas
Characteristics of Internal Transport Barrier in JT-6U Reversed Shear Plasmas Y. Sakamoto, Y. Kamada, S. Ide, T. Fujita, H. Shirai, T. Takizuka, Y. Koide, T. Fukuda, T. Oikawa, T. Suzuki, K. Shinohara,
More informationValidation Study of gyrokinetic simulation (GYRO) near the edge in Alcator C-Mod ohmic discharges
Validation Study of gyrokinetic simulation (GYRO) near the edge in Alcator C-Mod ohmic discharges C. Sung, A. E. White, N. T. Howard, D. Mikkelsen, C. Holland, J. Rice, M. Reinke, C. Gao, P. Ennever, M.
More informationEvidence for Magnetic Relaxation in Coaxial Helicity Injection Discharges in the HIT II Spherical Torus
Evidence for Magnetic Relaxation in Coaxial Helicity Injection Discharges in the HIT II Spherical Torus A. J. Redd Aerospace & Energetics Research University of Washington Seattle, Washington USA 24 Innovative
More informationStudies of Lower Hybrid Range of Frequencies Actuators in the ARC Device
Studies of Lower Hybrid Range of Frequencies Actuators in the ARC Device P. T. Bonoli, Y. Lin. S. Shiraiwa, G. M. Wallace, J. C. Wright, and S. J. Wukitch MIT PSFC, Cambridge, MA 02139 59th Annual Meeting
More informationEvolution of the pedestal on MAST and the implications for ELM power loadings
Evolution of the pedestal on MAST and the implications for ELM power loadings Presented by Andrew Kirk EURATOM / UKAEA Fusion Association UKAEA authors were funded jointly by the United Kingdom Engineering
More informationIntegrated Transport Simulation Aiming at Burning Plasmas
Workshop on Transport and Confinement NIFS University, 2006/11/09 Integrated Transport Simulation Aiming at Burning Plasmas A. Fukuyama and M. Honda Department of Nuclear Engineering, Kyoto University
More informationC-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 informationActive 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 informationThe Instrumental Function of the X-ray Imaging Crystal Spectrometer on Alcator C-Mod
The Instrumental Function of the X-ray Imaging Crystal Spectrometer on Alcator C-Mod M. Bitter, K. W. Hill, B. Stratton, S. Scott Princeton Plasma Physics Laboratory, Princeton, NJ, USA A. Ince-Cushman,
More informationActive Control of Alfvén Eigenmodes in the ASDEX Upgrade tokamak
Active Control of Alfvén Eigenmodes in the ASDEX Upgrade tokamak M. Garcia-Munoz, S. E. Sharapov, J. Ayllon, B. Bobkov, L. Chen, R. Coelho, M. Dunne, J. Ferreira, A. Figueiredo, M. Fitzgerald, J. Galdon-Quiroga,
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 informationCritical edge gradients and flows with reversed magnetic field in Alcator C-Mod
Critical edge gradients and flows with reversed magnetic field in B. LaBombard, N. Smick, M. Greenwald, J.W. Hughes B. Lipschultz, K. Marr, J.L. Terry, Team Contributed talk JO1.00004 Presented at the
More informationCharacteristics of the H-mode H and Extrapolation to ITER
Characteristics of the H-mode H Pedestal and Extrapolation to ITER The H-mode Pedestal Study Group of the International Tokamak Physics Activity presented by T.Osborne 19th IAEA Fusion Energy Conference
More informationObservations of Rotation Reversal and Fluctuation Hysteresis in Alcator C-Mod Plasmas
Observations of Rotation Reversal and Fluctuation Hysteresis in Alcator C-Mod Plasmas N.M. Cao 1, J.E. Rice 1, A.E. White 1, S.G. Baek 1, M.A. Chilenski 1, P.H. Diamond 2, A.E. Hubbard 1, J.W. Hughes 1,
More information