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Title: Advanced ST Plasma Scenario Simulations for NSTX

Abstract

Integrated scenario simulations are done for NSTX [National Spherical Torus Experiment] that address four primary milestones for developing advanced ST configurations: high {beta} and high {beta}{sub N} inductive discharges to study all aspects of ST physics in the high-beta regime; non-inductively sustained discharges for flattop times greater than the skin time to study the various current-drive techniques; non-inductively sustained discharges at high {beta} for flattop times much greater than a skin time which provides the integrated advanced ST target for NSTX; and non-solenoidal start-up and plasma current ramp-up. The simulations done here use the Tokamak Simulation Code (TSC) and are based on a discharge 109070. TRANSP analysis of the discharge provided the thermal diffusivities for electrons and ions, the neutral-beam (NB) deposition profile, and other characteristics. CURRAY is used to calculate the High Harmonic Fast Wave (HHFW) heating depositions and current drive. GENRAY/CQL3D is used to establish the heating and CD [current drive] deposition profiles for electron Bernstein waves (EBW). Analysis of the ideal-MHD stability is done with JSOLVER, BALMSC, and PEST2. The simulations indicate that the integrated advanced ST plasma is reachable, obtaining stable plasmas with {beta} {approx} 40% at {beta}{sub N}'s of 7.7-9, I{sub P} = 1.0 MA,more » and B{sub T} = 0.35 T. The plasma is 100% non-inductive and has a flattop of 4 skin times. The resulting global energy confinement corresponds to a multiplier of H{sub 98(y,2)} = 1.5. The simulations have demonstrated the importance of HHFW heating and CD, EBW off-axis CD, strong plasma shaping, density control, and early heating/H-mode transition for producing and optimizing these plasma configurations.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
836094
Report Number(s):
PPPL-4017
TRN: US0500493
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 28 Oct 2004
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONFINEMENT; DEPOSITION; ELECTRIC CURRENTS; ELECTRONS; HARMONICS; HEATING; PHYSICS; PLASMA; SIMULATION; STABILITY; START-UP; TARGETS; HIGH-BETA PLASMAS; NUMERICAL SIMULATION; SPHERICAL TORUS

Citation Formats

C.E. Kessel, E.J. Synakowski, D.A. Gates, R.W. Harvey, S.M. Kaye, T.K. Mau, J. Menard, C.K. Phillips, G. Taylor, R. Wilson, and the NSTX Research Team. Advanced ST Plasma Scenario Simulations for NSTX. United States: N. p., 2004. Web. doi:10.2172/836094.
C.E. Kessel, E.J. Synakowski, D.A. Gates, R.W. Harvey, S.M. Kaye, T.K. Mau, J. Menard, C.K. Phillips, G. Taylor, R. Wilson, & the NSTX Research Team. Advanced ST Plasma Scenario Simulations for NSTX. United States. doi:10.2172/836094.
C.E. Kessel, E.J. Synakowski, D.A. Gates, R.W. Harvey, S.M. Kaye, T.K. Mau, J. Menard, C.K. Phillips, G. Taylor, R. Wilson, and the NSTX Research Team. Thu . "Advanced ST Plasma Scenario Simulations for NSTX". United States. doi:10.2172/836094. https://www.osti.gov/servlets/purl/836094.
@article{osti_836094,
title = {Advanced ST Plasma Scenario Simulations for NSTX},
author = {C.E. Kessel and E.J. Synakowski and D.A. Gates and R.W. Harvey and S.M. Kaye and T.K. Mau and J. Menard and C.K. Phillips and G. Taylor and R. Wilson and the NSTX Research Team},
abstractNote = {Integrated scenario simulations are done for NSTX [National Spherical Torus Experiment] that address four primary milestones for developing advanced ST configurations: high {beta} and high {beta}{sub N} inductive discharges to study all aspects of ST physics in the high-beta regime; non-inductively sustained discharges for flattop times greater than the skin time to study the various current-drive techniques; non-inductively sustained discharges at high {beta} for flattop times much greater than a skin time which provides the integrated advanced ST target for NSTX; and non-solenoidal start-up and plasma current ramp-up. The simulations done here use the Tokamak Simulation Code (TSC) and are based on a discharge 109070. TRANSP analysis of the discharge provided the thermal diffusivities for electrons and ions, the neutral-beam (NB) deposition profile, and other characteristics. CURRAY is used to calculate the High Harmonic Fast Wave (HHFW) heating depositions and current drive. GENRAY/CQL3D is used to establish the heating and CD [current drive] deposition profiles for electron Bernstein waves (EBW). Analysis of the ideal-MHD stability is done with JSOLVER, BALMSC, and PEST2. The simulations indicate that the integrated advanced ST plasma is reachable, obtaining stable plasmas with {beta} {approx} 40% at {beta}{sub N}'s of 7.7-9, I{sub P} = 1.0 MA, and B{sub T} = 0.35 T. The plasma is 100% non-inductive and has a flattop of 4 skin times. The resulting global energy confinement corresponds to a multiplier of H{sub 98(y,2)} = 1.5. The simulations have demonstrated the importance of HHFW heating and CD, EBW off-axis CD, strong plasma shaping, density control, and early heating/H-mode transition for producing and optimizing these plasma configurations.},
doi = {10.2172/836094},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Oct 28 00:00:00 EDT 2004},
month = {Thu Oct 28 00:00:00 EDT 2004}
}

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