Dependences of Critical Rotational Shear in DIIID QHmode Discharges


 Berniece Sullivan
 1 years ago
 Views:
Transcription
1 Dependences of Critical Rotational Shear in DIIID QHmode Discharges by T.M. Wilks 1 with K.H. Burrell 2, Xi. Chen 2, A. Garofalo 2, R.J. Groebner 2, P. Diamond 3, Z. Guo 3, and J.W. Hughes 1 1 MIT 2 General Atomics 3 UCSD Presented at the American Physical Society Division of Plasma Physics San Jose, CA November 2, 2016
2 Abstract Quiescent Hmode (QHmode) has been identified as an attractive stationary operational regime in tokamaks due to the lack of edge localized modes (ELMs) in conjunction with good particle and impurity control due to the presence of an edge harmonic oscillation (EHO). The EHO allows operation of the QHmode edge near but also below the peelingballooning ELM stability limit, and has been shown to have a dependence on the edge rotational shear. Previous analysis has demonstrated the existence of a critical edge rotational shear necessary for the existence of typical lown EHO MHD activity, particularly with the transition to a wide pedestal regime with broadband turbulence. We build upon these results by further exploring critical edge rotational shear existence for the transition from a QHmode to a typical ELMy Hmode in DIIID, along with its associated turbulence and dependence on collisionality.
3 Outline Intro to QHmode Existence of critical ExB shearing rate necessary for EHO to exist and/or suppress ELMs Calculation of critical ExB shearing rate and experimental dependencies Comparison to GuoDiamond theory for critical ExB shearing rate
4 QHmode is an attractive operating regime due to naturally ELMfree state with particle/impurity control Pressure Gradient QHmodes exhibit Hmode confinement without the presence of ELMs Impurity control Stationary over wide operating regimes Controlled density and betan with constant radiated power Additional edge particle transport from edge harmonic oscillation (EHO) /m 3 km/s n e 10*V θ Ψ V φ kev kv/m E r T e Ψ T i Typically QHmodes are performed with: Reverse Ip Low density USN or DN Highly conditioned walls Pedestal Current Plasma operates just below PB boundary
5 Edge Harmonic Oscillation (EHO) is a saturated benign kinkpeeling mode EHOs typically: Are low n (1,2,3) dominated electromagnetic modes Increase particle transport to allow natural stability against ELMs can be thought of as a controlled and steady state ELM Are located in edge pedestal region as seen by BES and ECE measurements Chen NF 2017
6 Previous analysis shows evidence of critical ω ExB shear for EHO existence Comparison of total impurity rotation in the edge compared to the ExB rotation shows that the ExB rotation is the relevant quantity Garofalo, NF 2011 ω ExB normalized by the Alfven frequency shows clear separation between ELMy Hmodes and QHmode plasmas Chen, NF 2016 This suggests further experiments investigating the presence of a critical ExB shearing rate required for QHmode
7 DIIID torque ramping experiments explore critical ω ExB shear at QH ELMy Hmode transition T inj ω ExB D α BB EHO What dependence does ω ExB have on other plasma parameters?
8 Critical shearing rate can be calculated 1) in the far edge 2) at the inner side of Er well 1) Average far edge shear: ωω EEEEEE = cccccccc Δ EE rr RRBB pp Δrr edge 100ms time slice averaging Spline fit with user chosen knots Depends on value at separatrix Typically 2 CER data point clusers available Uncertainties associated with derivatives of spline fits can be difficult to quantify 2) Maximum inner edge shear: ωω EEEEEE = MMMMMM RRBB pp cccccccc BB EE rr RR BBBB 210ms time slice averaging Spline fit with automatically chosen knots Does not depend on value at separatrix Typicall 3 CER data point clusters available
9 Previous analysis from DIIID collisionality scan shows favorable ITER scaling for inner ω ExB shear Many spline fits performed and averaged to determine data points and uncertainties Additional data points needed to expand parameter space and confirm trend Chen NF 2017 y = 1.44e7x R 2 = 0.46
10 Inclusion of more DIIID data points shows slightly less dependence on collisionality Critical shears normalized by Alfven frequency ωω AA = rr 2ππππ φφ μμ 0 mm ii nn ee pppppp Inner side of Er well Addition of low B φ discharges show decreased trend as predicted by previous research Outliers disinguished by variations in amplitude of EHO and some broadband MHD noise Outlier
11 Shear on the outer side of the Er well shows similar dependence on collisionality Shear on outer side of Er well shows similar positive trend compared to the inside of Er well Outer ExB rotational shear is less dependent on B φ than inner shear In depth analysis of outliers may provide a more definitive trend Normalized Critical ωω EEEEEE /ωω AA Shear (outer) [krad/s] Outer side of Er well
12 Critical shearing rates show some dependence on temperature but not density Normalized Critical ωω EEEEEE /ωω AA Shear (outer) [krad/s] Outer side of Er well Normalized Critical ωω EEEEEE /ωω AA Shear (outer) [krad/s] Outer side of Er well [ /mm 3 ] Slightly negative temperature dependence with Alfven normalization Little to no density dependence after Alfven normalization
13 Recent theory from Guo and Diamond predicts critical ExB shearing rate dependencies Phase slip model: Is derived from cross phase dynamics Predicts a phase locked state with periodic slips that breach the PB boundary (ELMs) Predicts a phase slip state w/ higher ExB shear that pumps PB modes continuously (EHO) Assumes no dynamic noise Further simplifications for experimental comparison k y *Δx = constant L p /Δx = constant VV EEEEEE,cccc = ττ 1 AA 1 εε ββ2 kk yy Δxx LL pp Δxx [Guo,Diamond, PRL 2015] 1 2 ~ TT ii LL pp Alfven time Poloidal wave number Mode width Pressure gradient scale length
14 Guo and Diamond scaling shows preliminary agreement to QHmode shot database for outer Er shear Critical ωω EEEEEE Shear (outer) [krad/s] Critical Outer ωω EEEEEE Shear [krad/s] TT ii /L p Dependence of Critical Outer ωω EEEEEE Shear y = 0.36x+2075 R 2 = 0.43 Outer side of Er well Critical Outer ωω EEEEEE Shear [krad/s] ρ* Dependence of Critical Outer ωω EEEEEE Shear Outer side of Er well TT ii /L p Pedestal ρρ Yintercept may be caused by Doppler shift at reference mode surface neglected in GD theory No apparent outer shear correlation with ρ* may be due to ρ* calculation at pedestal
15 Inner Er shear has little correlation with GD theory and inconclusive scaling with ρ* TT ii /L p Dependence of Critical Inner ωω EEEEEE Shear ρ* Dependence of Critical Inner ωω EEEEEE Shear Critical Inner ωω EEEEEE Shear [krad/s] Inner side of Er well Critical Inner ωω EEEEEE Shear [krad/s] y = 8.4e8x+1.1e7 R 2 = 0.41 Inner side of Er well TT ii /L p No apparent inner shear correlation with GD scaling Pedestal ρρ Small ρ* variation does not conclusively prove dependence. Larger parameter space is required.
16 Conclusions Experiments support a requirement for critical ExB shearing rate necessary for EHO to suppress ELMs, but scaling is still undetermined Critical ω ExB : with νν ee for both inner and outer E r shear Has no dependence on nn ee pppppp Slightly with TT ii pppppp with ρρ for inner E r shear and no correlation with outer shear New theoretical predictions for ω ExB shearing rate dependencies, and database study is being constructed with TT ii pppppp /LL pp for outer Er shear and no correlation with inner shear Inclusion of mode characteristics is required
17 Future Work: Improvements to Model Comparison are clearly needed Less simplification of scaling is needed to bring in phase dynamics Broad displacement profile structure what k y and Δx is used for scaling? More data required to expand parameter space for validation of GuoDiamond theory ββ scans Lower temperature discharges at similar shape BOUT++ simulations can capture effects of changing ω ExB profile
18 Select references 1. A.M. Garofalo et. al., Nucl. Fusion 51, (2011) 2. Xi Chen et. al., Nucl Fusion 56, (2016) 3. Z.B. Guo and P.H. Diamond, PRL 114, (2015) 4. Xi Chen et. al., Nucl. Fusion 57, (2017) 5. T.S. Hahm and K.H. Burrell, PoP 2, 1648 (1995) 6. K.H. Burrell et. al., PoP 8, 2153 (2001) 7. K.H. Burrell et. al., PoP 12, (2005) 8. P.B. Snyder et. al., Nucl Fusion 47, (2007) 9. K.H. Burrell et. al., Nucl Fusion 49, (2009) 10. K.H. Burrell et. al., PRL 102, (2009) 11. A.M. Garofalo et. al., Nucl Fusion 51, (2011) 12. K.H. Burrell et. al., PoP 19, (2012) 13. K.H. Burrell et. al., Nucl Fusion 53, (2013) 14. W.M. Solomon et. al., PRL 113, (2014) 15. K.H. Burrell et. al., PoP 23, (2016)
19 Requests for presentation
Edge Rotational Shear Requirements for the Edge Harmonic Oscillation in DIII D Quiescent H mode Plasmas
Edge Rotational Shear Requirements for the Edge Harmonic Oscillation in DIII D Quiescent H mode Plasmas by T.M. Wilks 1 with A. Garofalo 2, K.H. Burrell 2, Xi. Chen 2, P.H. Diamond 3, Z.B. Guo 3, X. Xu
More informationUnderstanding Edge Harmonic Oscillation Physics Using NIMROD
Understanding Edge Harmonic Oscillation Physics Using NIMROD J. King With contributions from S. Kruger & A. Pankin (TechX); K. Burrell, A. Garofalo, R. Groebner & P. Snyder (General Atomics) Work supported
More informationCharacteristics of the Hmode H and Extrapolation to ITER
Characteristics of the Hmode H Pedestal and Extrapolation to ITER The Hmode Pedestal Study Group of the International Tokamak Physics Activity presented by T.Osborne 19th IAEA Fusion Energy Conference
More informationThe EPED Pedestal Model: Extensions, Application to ELMSuppressed Regimes, and ITER Predictions
The EPED Pedestal Model: Extensions, Application to ELMSuppressed Regimes, and ITER Predictions P.B. Snyder 1, T.H. Osborne 1, M.N.A. Beurskens 2, K.H. Burrell 1, R.J. Groebner 1, J.W. Hughes 3, R. Maingi
More informationInfluence of Beta, Shape and Rotation on the Hmode Pedestal Height
Influence of Beta, Shape and Rotation on the Hmode Pedestal Height by A.W. Leonard with R.J. Groebner, T.H. Osborne, and P.B. Snyder Presented at FortyNinth APS Meeting of the Division of Plasma Physics
More informationMHD Analysis of the Tokamak Edge Pedestal in the Low Collisionality Regime Thoughts on the Physics of ELMfree QH and RMP Discharges
MHD Analysis of the Tokamak Edge Pedestal in the Low Collisionality Regime Thoughts on the Physics of ELMfree QH and RMP Discharges P.B. Snyder 1 Contributions from: H.R. Wilson 2, D.P. Brennan 1, K.H.
More informationW.M. Solomon 1. Presented at the 54th Annual Meeting of the APS Division of Plasma Physics Providence, RI October 29November 2, 2012
Impact of Torque and Rotation in High Fusion Performance Plasmas by W.M. Solomon 1 K.H. Burrell 2, R.J. Buttery 2, J.S.deGrassie 2, E.J. Doyle 3, A.M. Garofalo 2, G.L. Jackson 2, T.C. Luce 2, C.C. Petty
More informationELMs and Constraints on the HMode Pedestal:
ELMs and Constraints on the HMode Pedestal: A Model Based on PeelingBallooning Modes P.B. Snyder, 1 H.R. Wilson, 2 J.R. Ferron, 1 L.L. Lao, 1 A.W. Leonard, 1 D. Mossessian, 3 M. Murakami, 4 T.H. Osborne,
More informationPredicting the Rotation Profile in ITER
Predicting the Rotation Profile in ITER by C. Chrystal1 in collaboration with B. A. Grierson2, S. R. Haskey2, A. C. Sontag3, M. W. Shafer3, F. M. Poli2, and J. S. degrassie1 1General Atomics 2Princeton
More informationGA A27433 THE EPED PEDESTAL MODEL: EXTENSIONS, APPLICATION TO ELMSUPPRESSED REGIMES, AND ITER PREDICTIONS
GA A27433 THE EPED PEDESTAL MODEL: EXTENSIONS, APPLICATION TO ELMSUPPRESSED REGIMES, AND ITER PREDICTIONS by P.B. SNYDER, T.H. OSBORNE, M.N.A. BEURSKENS, K.H. BURRELL, R.J. GROEBNER, J.W. HUGHES, R. MAINGI,
More informationGA A25592 STABILITY AND DYNAMICS OF THE EDGE PEDESTAL IN THE LOW COLLISIONALITY REGIME: PHYSICS MECHANISMS FOR STEADYSTATE ELMFREE OPERATION
GA A25592 STABILITY AND DYNAMICS OF THE EDGE PEDESTAL IN THE LOW COLLISIONALITY REGIME: PHYSICS MECHANISMS FOR STEADYSTATE ELMFREE OPERATION by P.B. SNYDER, K.H. BURRELL, H.R. WILSON, M.S. CHU, M.E.
More informationDevelopment and Validation of a Predictive Model for the Pedestal Height (EPED1)
Development and Validation of a Predictive Model for the Pedestal Height (EPED1) P.B. Snyder 1 with R.J. Groebner 1, A.W. Leonard 1, T.H. Osborne 1, M. Beurskens 3, L.D. Horton 4, A.E. Hubbard 5, J.W.
More informationValidation of Theoretical Models of Intrinsic Torque in DIIID and Projection to ITER by Dimensionless Scaling
Validation of Theoretical Models of Intrinsic Torque in DIIID and Projection to ITER by Dimensionless Scaling by B.A. Grierson1, C. Chrystal2, W.X. Wang1, J.A. Boedo3, J.S. degrassie2, W.M. Solomon2,
More informationEffect of Ion Orbit Loss on Rotation and the Radial Electric Field in the DIIID Tokamak
Effect of Ion Orbit Loss on Rotation and the Radial Electric Field in the DIIID Tokamak by T.M. Wilks 1 with W.M. Stacey 1 and T.E. Evans 2 1 Georgia Institute of Technology 2 General Atomics Presented
More informationUCLA. Broadband Magnetic and Density Fluctuation Evolution Prior to First ELM in DIIID Edge Pedestal. Presented by G. Wang a, In collaboration with
Broadband Magnetic and Density Fluctuation Evolution Prior to First ELM in DIIID Edge Pedestal Presented by G. Wang a, In collaboration with W.A. Peebles a, P.B. Snyder b, T.L. Rhodes a, E.J. Doyle a,
More informationGA A26887 ADVANCES TOWARD QHMODE VIABILITY FOR ELMFREE OPERATION IN ITER
GA A26887 ADVANCES TOWARD QHMODE VIABILITY FOR ELMFREE 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 informationPedestal Stability and Transport on the Alcator CMod Tokamak: Experiments in Support of Developing Predictive Capability
1 EX/P415 Pedestal Stability and Transport on the Alcator CMod Tokamak: Experiments in Support of Developing Predictive Capability J.W. Hughes 1, P.B. Snyder 2, X. Xu 3, J.R. Walk 1, E.M. Davis 1, R.M.
More informationABSTRACT, POSTER LP1 12 THURSDAY 11/7/2001, APS DPP CONFERENCE, LONG BEACH. Recent Results from the Quiescent Double Barrier Regime on DIIID
ABSTRACT, POSTER LP1 1 THURSDAY 11/7/1, APS DPP CONFERENCE, LONG BEACH Recent Results from the Quiescent Double Barrier Regime on DIIID E.J. Doyle, K.H. Burrell, T. Casper, J.C. DeBoo, A. Garofalo, P.
More informationELM Suppression in DIIID Hybrid Plasmas Using n=3 Resonant Magnetic Perturbations
1 EXC/P502 ELM Suppression in DIIID 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 informationEFFECT OF EDGE NEUTRAL SOUCE PROFILE ON HMODE PEDESTAL HEIGHT AND ELM SIZE
EFFECT OF EDGE NEUTRAL SOUCE PROFILE ON HMODE PEDESTAL HEIGHT AND ELM SIZE T.H. Osborne 1, P.B. Snyder 1, R.J. Groebner 1, A.W. Leonard 1, M.E. Fenstermacher 2, and the DIIID Group 47 th Annual Meeting
More informationEdge Impurity Dynamics During an ELM Cycle in DIII D
Edge Impurity Dynamics During an ELM Cycle in by M.R. Wade 1 in collaboration with K.H. Burrell, A.W. Leonard, T.H. Osborne, P.B. Snyder, J.T. Hogan, 1 and D. Coster 3 1 Oak Ridge National Laboratory General
More informationGA A22443 STUDY OF H MODE THRESHOLD CONDITIONS IN DIII D
GA A443 STUDY OF H MODE THRESHOLD CONDITIONS IN DIII D by R.J. GROEBNER, T.N. CARLSTROM, K.H. BURRELL, S. CODA, E.J. DOYLE, P. GOHIL, K.W. KIM, Q. PENG, R. MAINGI, R.A. MOYER, C.L. RETTIG, T.L. RHODES,
More informationOVERVIEW OF THE ALCATOR CMOD PROGRAM. IAEAFEC November, 2004 Alcator Team Presented by Martin Greenwald MIT Plasma Science & Fusion Center
OVERVIEW OF THE ALCATOR CMOD PROGRAM IAEAFEC November, 2004 Alcator Team Presented by Martin Greenwald MIT Plasma Science & Fusion Center OUTLINE CMod is compact, high field, high density, high power
More informationObservation of Reduced Core Electron Temperature Fluctuations and Intermediate Wavenumber Density Fluctuations in H and QHmode Plasmas
Observation of Reduced Core Electron Temperature Fluctuations and Intermediate Wavenumber Density Fluctuations in H and QHmode Plasmas EX/P535 L. Schmitz 1), A.E. White 1), G. Wang 1), J.C. DeBoo 2),
More informationImpact of Toroidal Flow on ITB HMode Plasma Performance in Fusion Tokamak
Impact of oroidal Flow on I HMode Plasma Performance in Fusion okamak oonyarit Chatthong 1,*, hawatchai Onjun 1, Roppon Picha and Nopporn Poolyarat 3 1 School of Manufacturing Systems and Mechanical Engineering,
More informationDIII D UNDERSTANDING AND CONTROL OF TRANSPORT IN ADVANCED TOKAMAK REGIMES IN DIII D QTYUIOP C.M. GREENFIELD. Presented by
UNDERSTANDING AND CONTROL OF TRANSPORT IN ADVANCED TOKAMAK REGIMES IN Presented by C.M. GREENFIELD for J.C. DeBOO, T.C. LUCE, B.W. STALLARD, E.J. SYNAKOWSKI, L.R. BAYLOR,3 K.H. BURRELL, T.A. CASPER, E.J.
More informationAnalysis and modelling of MHD instabilities in DIIID plasmas for the ITER mission
Analysis and modelling of MHD instabilities in DIIID plasmas for the ITER mission by F. Turco 1 with J.M. Hanson 1, A.D. Turnbull 2, G.A. Navratil 1, C. PazSoldan 2, F. Carpanese 3, C.C. Petty 2, T.C.
More informationAdvancing the predictive capability for pedestal structure through experiment and modeling
Advancing the predictive capability for pedestal structure through experiment and modeling Highlights from the US Fusion Energy Science FY11 Joint Research Target J.W. Hughes 1, C.S. Chang 2, R.J. Groebner
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 informationGA A27857 IMPACT OF PLASMA RESPONSE ON RMP ELM SUPPRESSION IN DIIID
GA A27857 IMPACT OF PLASMA RESPONSE ON RMP ELM SUPPRESSION IN DIIID by A. WINGEN, N.M. FERRARO, M.W. SHAFER, E.A. UNTERBERG, T.E. EVANS, D.L. HILLIS, and P.B. SNYDER JULY 2014 DISCLAIMER This report was
More informationInfernal modes and physical interpreta3on of the edge harmonic oscilla3ons in tokamak QH mode discharges
Infernal modes and physical interpreta3on of the edge harmonic oscilla3ons in tokamak QH mode discharges Linjin Zheng, M. Kotschenreuther, and P. Valanju Ins3tute for Fusion Studies University of Texas
More informationHmode Pedestal Enhancement and Improved Confinement in DIIID with Lithium Injection
Hmode Pedestal Enhancement and Improved Confinement in DIIID with Lithium Injection by G.L. Jackson, with R. Maingi, T.H. Osborne, D.K. Mansfield, C.P. Chrobak, B.A. Grierson, A.G. McLean, Z. Yan, S.L.
More informationDIII D Research in Support of ITER
Research in Support of ITER by E.J. Strait and the Team Presented at 22nd IAEA Fusion Energy Conference Geneva, Switzerland October 1318, 28 DIIID Research Has Made Significant Contributions in the Design
More informationLinjin Zheng, Infernal Modes at Tokamak H mode Pedestal A Physics Interpreta;on for Edge Harmonic Oscilla;on (EHO)
International Sherwood Fusion Theory Conference, Austin, May 24, 2011 Infernal Modes at Tokamak H mode Pedestal A Physics Interpreta;on for Edge Harmonic Oscilla;on (EHO) Linjin Zheng, M. T. Kotschenreuther,
More informationDynamics of Zonal Shear Collapse in Hydrodynamic Electron Limit. Transport Physics of the Density Limit
Dynamics of Zonal Shear Collapse in Hydrodynamic Electron Limit Transport Physics of the Density Limit R. Hajjar, P. H. Diamond, M. Malkov This research was supported by the U.S. Department of Energy,
More informationLocal Plasma Parameters and HMode Threshold in Alcator CMod
PFC/JA9642 Local Plasma Parameters and HMode Threshold in Alcator CMod A.E. Hubbard, J.A. Goetz, I.H. Hutchinson, Y. In, J. Irby, B. LaBombard, P.J. O'Shea, J.A. Snipes, P.C. Stek, Y. Takase, S.M.
More informationTECHNICAL NOTE AUTOMATIC GENERATION OF POINT SPRING SUPPORTS BASED ON DEFINED SOIL PROFILES AND COLUMNFOOTING PROPERTIES
COMPUTERS AND STRUCTURES, INC., FEBRUARY 2016 TECHNICAL NOTE AUTOMATIC GENERATION OF POINT SPRING SUPPORTS BASED ON DEFINED SOIL PROFILES AND COLUMNFOOTING PROPERTIES Introduction This technical note
More informationPedestals and transitions in Imode and comparison to Hmode
Pedestals and transitions in Imode and comparison to Hmode Amanda Hubbard, MIT Plasma Science and Fusion Center With thanks for input from J.W. Hughes, D. Brunner, M. Greenwald, B. LaBombard, A. Marinoni,
More informationInvestigation of Intrinsic Rotation Dependencies in Alcator CMod
Investigation of Intrinsic Rotation Dependencies in Alcator CMod 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 CMod and ASDEX
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 informationEnhanced Energy Confinement Discharges with Lmodelike Edge Particle Transport*
Enhanced Energy Confinement Discharges with Lmodelike Edge Particle Transport* E. Marmar, B. Lipschultz, A. Dominguez, M. Greenwald, N. Howard, A. Hubbard, J. Hughes, B. LaBombard, R. McDermott, M. Reinke,
More informationParticle transport results from collisionality scans and perturbative experiments on DIIID
1 EX/P326 Particle transport results from collisionality scans and perturbative experiments on DIIID E.J. Doyle 1), L. Zeng 1), G.M. Staebler 2), T.E. Evans 2), T.C. Luce 2), G.R. McKee 3), S. Mordijck
More informationHmode performance and pedestal studies with enhanced particle control on Alcator CMod
Hmode performance and pedestal studies with enhanced particle control on Alcator CMod J.W. Hughes, B. LaBombard, M. Greenwald, A. Hubbard, B. Lipschultz, K. Marr, R. McDermott, M. Reinke, J.L. Terry
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 informationNew bootstrap current formula valid for steep edge pedestal, and its implication to pedestal stability
1 TH/P412 New bootstrap current formula valid for steep edge pedestal, and its implication to pedestal stability C.S. Chang 1,2, Sehoon Koh 2,*, T. Osborne 3, R. Maingi 4, J. Menard 1, S. Ku 1, Scott
More informationStudy of B +1, B +4 and B +5 impurity poloidal rotation in Alcator CMod plasmas for 0.75 ρ 1.0.
Study of B +1, B +4 and B +5 impurity poloidal rotation in Alcator CMod plasmas for 0.75 ρ 1.0. Igor Bespamyatnov, William Rowan, Ronald Bravenec, and Kenneth Gentle The University of Texas at Austin,
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 informationGA A27418 THE ROLE OF ZONAL FLOWS AND PREDATOR PREY OSCILLATIONS IN THE FORMATION OF CORE AND EDGE TRANSPORT BARRIERS
GA A27418 THE ROLE OF ZONAL FLOWS AND PREDATOR PREY OSCILLATIONS IN THE FORMATION OF CORE AND EDGE TRANSPORT BARRIERS by L. SCHMITZ, L. ZENG, T.L. RHODES, J.C. HILLESHEIM, W.A. PEEBLES, R.J. GROEBNER,
More informationOn tokamak plasma rotation without the neutral beam torque
On tokamak plasma rotation without the neutral beam torque Antti Salmi (VTT) With contributions from T. Tala (VTT), C. Fenzi (CEA) and O. Asunta (Aalto) 2 Motivation: Toroidal rotation Plasma rotation
More informationQTYUIOP LOCAL ANALYSIS OF CONFINEMENT AND TRANSPORT IN NEUTRAL BEAM HEATED DIII D DISCHARGES WITH NEGATIVE MAGNETIC SHEAR D.P. SCHISSEL.
LOCAL ANALYSIS OF CONFINEMENT AND TRANSPORT IN NEUTRAL BEAM HEATED DIII D DISCHARGES WITH NEGATIVE MAGNETIC SHEAR Presented by D.P. SCHISSEL for the DIII D Team* Presented to 16th IAEA Fusion Conference
More informationDiscovery of stationary operation of quiescent Hmode plasmas with NetZero NBI
Discovery of stationary operation of quiescent Hmode plasmas with NetZero NBI torque and high energy confinement on DIIID K.H. Burrell 1, K. Barada 2, X. Chen 1, A.M. Garofalo 1, R.J. Groebner 1, C.M.
More informationDIII D I. INTRODUCTION QTYUIOP
I. INTRODUCTION Among the endless surprises that the tokamak plasma has provided us, the formation of the transport barrier in the plasma interior is the least expected and the most interesting one Inside
More informationTH/P84 Second Ballooning Stability Effect on Hmode Pedestal Scalings
TH/P84 Second Ballooning Stability Effect on Hmode Pedestal Scalings T. Onjun 1), A.H. Kritz ), G. Bateman ), A. Pankin ) 1) Sirindhorn International Institute of Technology, Klong Luang, Pathumthani,
More informationResistive Wall Mode Control in DIIID
Resistive Wall Mode Control in DIIID by Andrea M. Garofalo 1 for G.L. Jackson 2, R.J. La Haye 2, M. Okabayashi 3, H. Reimerdes 1, E.J. Strait 2, R.J. Groebner 2, Y. In 4, M.J. Lanctot 1, G.A. Navratil
More informationEffect of Resonant and Nonresonant Magnetic Braking on Error Field Tolerance in High Beta Plasmas
1 EX/53Ra Effect of Resonant and Nonresonant Magnetic Braking on Error Field Tolerance in High Beta Plasmas H. Reimerdes 1), A.M. Garofalo 2), E.J. Strait 2), R.J. Buttery 3), M.S. Chu 2), Y. In 4),
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 informationCMOD PAC FEBRUARY, 2005 PRESENTED BY MARTIN GREENWALD MIT PLASMA SCIENCE & FUSION CENTER
TRANSPORT PROGRAM CMod CMOD PAC FEBRUARY, 2005 PRESENTED BY MARTIN GREENWALD MIT PLASMA SCIENCE & FUSION CENTER TRANSPORT IS A BROAD TOPIC WHERE DO WE FOCUS? We emphasize areas where CMod  Has unique
More informationGA A26891 A FIRST PRINCIPLES PREDICTIVE MODEL OF THE PEDESTAL HEIGHT AND WIDTH: DEVELOPMENT, TESTING, AND ITER OPTIMIZATION WITH THE EPED MODEL
GA A26891 A FIRST PRINCIPLES PREDICTIVE MODEL OF THE PEDESTAL HEIGHT AND WIDTH: DEVELOPMENT, TESTING, AND ITER OPTIMIZATION WITH THE EPED MODEL by P.B. SNYDER, R.J. GROEBNER, J.W. HUGHES, T.H. OSBORNE,
More informationLight Impurity Transport Studies in Alcator CMod*
Light Impurity Transport Studies in Alcator CMod* 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 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 informationTHE DIII D PROGRAM THREEYEAR PLAN
THE PROGRAM THREEYEAR PLAN by T.S. Taylor Presented to Program Advisory Committee Meeting January 2 21, 2 3 /TST/wj PURPOSE OF TALK Show that the program plan is appropriate to meet the goals and is wellaligned
More informationIssues of Perpendicular Conductivity and Electric Fields in Fusion Devices
Issues of Perpendicular Conductivity and Electric Fields in Fusion Devices Michael Tendler, Alfven Laboratory, Royal Institute of Technology, Stockholm, Sweden Plasma Turbulence Turbulence can be regarded
More informationModeling of ELM Dynamics for ITER
Modeling of ELM Dynamics for ITER A.Y. PANKIN 1, G. BATEMAN 1, D.P. BRENNAN 2, A.H. KRITZ 1, S. KRUGER 3, P.B. SNYDER 4 and the NIMROD team 1 Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015
More informationReduced Electron Thermal Transport in Low Collisionality Hmode Plasmas in DIIID and the Importance of Smallscale Turbulence
1 Reduced Electron Thermal Transport in Low Collisionality Hmode Plasmas in DIIID and the Importance of Smallscale Turbulence L. Schmitz, 1 C. Holland, 2 T.L. Rhodes, 1 G. Wang, 1 L. Zeng, 1 A.E. White,
More informationDIII D. by F. Turco 1. New York, January 23 rd, 2015
Modelling and Experimenting with ITER: the MHD Challenge by F. Turco 1 with J.M. Hanson 1, A.D. Turnbull 2, G.A. Navratil 1, F. Carpanese 3, C. PazSoldan 2, C.C. Petty 2, T.C. Luce 2, W.M. Solomon 4,
More informationMinimal Model Study for ELM Control by Supersonic Molecular Beam Injection and Pellet Injection
25 th Fusion Energy Conference, Saint Petersburg, Russia, 2014 TH/P29 Minimal Model Study for ELM Control by Supersonic Molecular Beam Injection and Pellet Injection Tongnyeol Rhee 1,2, J.M. Kwon 1, P.H.
More informationCMod Transport Program
CMod 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 CMod
More informationTH/P614 Integrated particle simulation of neoclassical and turbulence physics in the tokamak pedestal/edge region using XGC a)
1 TH/P614 Integrated particle simulation of neoclassical and turbulence physics in the tokamak pedestal/edge region using XGC a) 1 Chang, C.S., 1 Ku, S., 2 Adams M., 3 D Azevedo, G., 4 Chen, Y., 5 Cummings,
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 3110102, Japan 1) University
More informationMHD Pedestal Paradigm (Conventional Wisdom)
Pedestal Transport D. R. Hatch M. Kotschenreuther, X. Liu, S. M. Mahajan, (Institute for Fusion Studies, University of Texas at Austin) S. Saarelma, C. Maggi, C. Giroud, J. Hillesheim (CCFE) J. Hughes
More informationStationary, High Bootstrap Fraction Plasmas in DIIID Without Inductive Current Control
Stationary, High Bootstrap Fraction Plasmas in DIIID Without Inductive Current Control P. A. Politzer, 1 A. W. Hyatt, 1 T. C. Luce, 1 F. W. Perkins, 4 R. Prater, 1 A. D. Turnbull, 1 D. P. Brennan, 5 J.
More informationCharacterization of neoclassical tearing modes in highperformance I mode plasmas with ICRF mode conversion flow drive on Alcator CMod
1 EX/P422 Characterization of neoclassical tearing modes in highperformance I mode plasmas with ICRF mode conversion flow drive on Alcator CMod Y. Lin, R.S. Granetz, A.E. Hubbard, M.L. Reinke, J.E.
More informationQTYUIOP ENERGY TRANSPORT IN NEUTRAL BEAM HEATED DIII D DISCHARGES WITH NEGATIVE MAGNETIC SHEAR D.P. SCHISSEL. Presented by. for the DIII D Team*
ENERGY TRANSPORT IN NEUTRAL BEAM HEATED DIII D DISCHARGES WITH NEGATIVE MAGNETIC SHEAR Presented by D.P. SCHISSEL for the DIII D Team* Presented to 38th APS/DPP Meeting NOVEMBER 11 15, 1996 Denver, Colorado
More informationGA A25229 FINAL REPORT ON THE OFES ELM MILESTONE FOR FY05
GA A25229 ELM MILESTONE FOR FY05 by D.P. BRENNAN, E.D. HELD, S.E. KRUGER, A.Y. PANKIN, D.D. SCHNACK, AND C.R. SOVINEC APRIL 2006 DISCLAIMER This report was prepared as an account of work sponsored by an
More informationMeasurements of Core Electron Temperature Fluctuations in DIIID with Comparisons to Density Fluctuations and Nonlinear GYRO Simulations
Measurements of Core Electron Temperature Fluctuations in DIIID 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 informationValidation Study of gyrokinetic simulation (GYRO) near the edge in Alcator CMod ohmic discharges
Validation Study of gyrokinetic simulation (GYRO) near the edge in Alcator CMod ohmic discharges C. Sung, A. E. White, N. T. Howard, D. Mikkelsen, C. Holland, J. Rice, M. Reinke, C. Gao, P. Ennever, M.
More informationComparison of Deuterium Toroidal and Poloidal Rotation to Neoclassical Theory in the DIIID Tokamak
1 EX/P319 omparison of Deuterium Toroidal and Poloidal Rotation to Neoclassical Theory in the DIIID Tokamak B.A. Grierson 1, K.H. Burrell and W.M. Solomon 1 1 Princeton Plasma Physics Laboratory, Princeton
More informationReview for Exam Hyunse Yoon, Ph.D. Assistant Research Scientist IIHRHydroscience & Engineering University of Iowa
57:020 Fluids Mechanics Fall2013 1 Review for Exam3 12. 11. 2013 Hyunse Yoon, Ph.D. Assistant Research Scientist IIHRHydroscience & Engineering University of Iowa 57:020 Fluids Mechanics Fall2013 2 Chapter
More informationA Simulation Model for Drift Resistive Ballooning Turbulence Examining the Influence of Selfconsistent Zonal Flows *
A Simulation Model for Drift Resistive Ballooning Turbulence Examining the Influence of Selfconsistent Zonal Flows * Bruce I. Cohen, Maxim V. Umansky, Ilon Joseph Lawrence Livermore National Laboratory
More informationRelating the LH Power Threshold Scaling to Edge Turbulence Dynamics
Relating the LH 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 informationSupported by. The dependence of Hmode energy confinement and transport on collisionality in NSTX
NSTXU Supported by The dependence of Hmode energy confinement and transport on collisionality in NSTX Coll of Wm & Mary Columbia U CompX General Atomics FIU INL Johns Hopkins U LANL LLNL Lodestar MIT
More informationImode and Hmode plasmas at high magnetic field and pressure on Alcator CMod
Imode and Hmode plasmas at high magnetic field and pressure on Alcator CMod A. E. Hubbard, J. W Hughes, S.G. Baek, D. Brunner, I. Cziegler 1, E. Edlund, T. Golfinopoulos, M.J. Greenwald, J. Irby, B.
More informationInnovative Concepts Workshop Austin, Texas February 1315, 2006
Don Spong Oak Ridge National Laboratory Acknowledgements: Jeff Harris, Hideo Sugama, Shin Nishimura, Andrew Ware, Steve Hirshman, Wayne Houlberg, Jim Lyon Innovative Concepts Workshop Austin, Texas February
More informationGA A27398 COMPARISON OF DEUTERIUM TOROIDAL AND POLOIDAL ROTATION TO NEOCLASSICAL THEORY
GA A27398 COMPARISON OF DEUTERIUM TOROIDAL AND POLOIDAL ROTATION TO NEOCLASSICAL THEORY by B.A. GRIERSON, K.H. BURRELL and W.M. SOLOMON OCTOBER 212 DISCLAIMER This report was prepared as an account of
More informationOperational Phase Space of the Edge Plasma in Alcator CMod
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 informationDeuterium experiment project on LHD and impact of plasma ion species on confinement
Deuterium experiment project on LHD and impact of plasma ion species on confinement M. Osakabe a, Y.Yokoyama a, K.Nagaoka a, H.Takahashi a, R.Seki a, S.Murakami b, M.Yoshinuma a, K.Tanaka a, K.Ida a, K.Nagasaki
More informationTriggering Mechanisms for Transport Barriers
Triggering Mechanisms for Transport Barriers O. Dumbrajs, J. Heikkinen 1, S. Karttunen 1, T. Kiviniemi, T. KurkiSuonio, M. Mantsinen, K. Rantamäki 1, S. Saarelma, R. Salomaa, S. Sipilä, T. Tala 1 EuratomTEKES
More informationPossible Pedestal Transport Theory Models And Modeling Tests
Possible Pedestal Transport Theory Models And Modeling Tests J.D. Callen, University of Wisconsin, Madison, WI 537061609 DIIID Pedestal Transport Workshop, General Atomics, San Diego, CA, February 17,
More informationRole of Density Gradient Driven Trapped Electron Mode Turbulence in the Hmode Inner Core with Electron Heating a)
Role of Density Gradient Driven Trapped Electron Mode Turbulence in the Hmode Inner Core with Electron Heating a) D. R. Ernst, K. H. Burrell, W. Guttenfelder, T. L. Rhodes, A. M. Dimits 5, R. Bravenec,
More informationPlasma Physics Performance. Rebecca Cottrill Vincent Paglioni
Plasma Physics Performance Rebecca Cottrill Vincent Paglioni Objectives Ensure adequate plasma power and Hmode operation with a reasonable confinement time. Maintain plasma stability against various magnetohydrodynamic
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 informationScalings of nonlinearity in the edge plasma and its connection to transition thresholds
Scalings of nonlinearity in the edge plasma and its connection to transition thresholds I. Cziegler, P. H. Diamond, G. R. Tynan UCSD, Center for Momentum Transport and Flow Organization A. E. Hubbard,
More informationGA A22993 EFFECTS OF PLASMA SHAPE AND PROFILES ON EDGE STABILITY IN DIII D
GA A22993 EFFECTS OF PLASMA SHAPE AND PROFILES ON EDGE by L.L. LAO, V.S. CHAN, L. CHEN, E.J. DOYLE, J.R. FERRON, R.J. GROEBNER, G.L. JACKSON, R.J. LA HAYE, E.A. LAZARUS, G.R. McKEE, R.L. MILLER, M. MURAKAMI,
More information(Motivation) Reactor tokamaks have to run without disruptions
Abstract A database has been developed to study the evolution, the nonlinear effects on equilibria, and the disruptivity of locked and quasistationary modes with poloidal and toroidal mode numbers m=2
More informationFirst Observation of ELM Suppression by Magnetic Perturbations in ASDEX Upgrade and Comparison to DIIID MatchedShape Plasmas
1 PD/11 First Observation of ELM Suppression by Magnetic Perturbations in ASDEX Upgrade and Comparison to DIIID MatchedShape Plasmas R. Nazikian 1, W. Suttrop 2, A. Kirk 3, M. Cavedon 2, T.E. Evans
More informationCharacteristics of EnergeticIonDriven Geodesic Acoustic Modes in the Large Helical Device(LHD)
O4 12 th IAEA TM on Energetic Particles in Magnetic Confinement Systems, 710 Sep, Austin, USA Characteristics of EnergeticIonDriven Geodesic Acoustic Modes in the Large Helical Device(LHD) K. Toi,
More informationMultiscale turbulence, electron transport, and Zonal Flows in DIIID
Multiscale turbulence, electron transport, and Zonal Flows in DIIID L. Schmitz1 with C. Holland2, T.L. Rhodes1, G. Wang1, J.C. Hillesheim1, A.E. White3, W. A. Peebles1, J. DeBoo4, G.R. McKee5, J. DeGrassie4,
More informationCritical edge gradients and flows with reversed magnetic field in Alcator CMod
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 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 informationGA A26866 REDUCED ELECTRON THERMAL TRANSPORT IN LOW COLLISIONALITY HMODE PLASMAS IN DIIID AND THE IMPORTANCE OF SMALLSCALE TURBULENCE
GA A26866 REDUCED ELECTRON THERMAL TRANSPORT IN LOW COLLISIONALITY HMODE PLASMAS IN DIIID AND THE IMPORTANCE OF SMALLSCALE TURBULENCE by L. SCHMITZ, C. HOLLAND, T.L. RHODES, G. WANG, L. ZENG, A.E. WHITE,
More information