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Title: Electron Cyclotron Heating and Current Drive for Maintaining Minimum q in Negative Central Shear Discharges

Abstract

Toroidal plasmas created with negative magnetic shear in the core region offer advantages in terms of MHD stability properties. These plasmas, transiently created in several tokamaks, have exhibited high performance as measured by normalized stored energy and neutron production rates. A critical issue with extending the duration of these plasmas is the need to maintain the off-axis-peaked current distribution required to support the minimum in the safety factor q at large radii. We present equilibrium and transport simulations that explore the use of electron cyclotron heating and current drive to maintain this negative shear configuration. Using parameters consistent with DIII-D tokamak operation, we find that with sufficiently high injected power, it is possible to achieve steady-state conditions employing well aligned electron cyclotron and bootstrap current drive in fully non-inductively current-driven configurations.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
15004711
Report Number(s):
UCRL-JC-152890
TRN: US0305004
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 29th European Physical Society Conference on Plasma Physics and Controlled Fusion, Montreux (CH), 06/17/2002--06/21/2002; Other Information: PBD: 24 Apr 2003
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOOTSTRAP CURRENT; CONFIGURATION; CYCLOTRONS; DOUBLET-3 DEVICE; ELECTRONS; HEATING; NEUTRONS; PHYSICS; PRODUCTION; SAFETY; SHEAR; STABILITY; STEADY-STATE CONDITIONS; STORED ENERGY

Citation Formats

Casper, T A, Kaiser, T B, Jong, R A, LoDestro, L L, Moller, J, Pearlstein, L D, and Dodge, T. Electron Cyclotron Heating and Current Drive for Maintaining Minimum q in Negative Central Shear Discharges. United States: N. p., 2003. Web.
Casper, T A, Kaiser, T B, Jong, R A, LoDestro, L L, Moller, J, Pearlstein, L D, & Dodge, T. Electron Cyclotron Heating and Current Drive for Maintaining Minimum q in Negative Central Shear Discharges. United States.
Casper, T A, Kaiser, T B, Jong, R A, LoDestro, L L, Moller, J, Pearlstein, L D, and Dodge, T. 2003. "Electron Cyclotron Heating and Current Drive for Maintaining Minimum q in Negative Central Shear Discharges". United States. https://www.osti.gov/servlets/purl/15004711.
@article{osti_15004711,
title = {Electron Cyclotron Heating and Current Drive for Maintaining Minimum q in Negative Central Shear Discharges},
author = {Casper, T A and Kaiser, T B and Jong, R A and LoDestro, L L and Moller, J and Pearlstein, L D and Dodge, T},
abstractNote = {Toroidal plasmas created with negative magnetic shear in the core region offer advantages in terms of MHD stability properties. These plasmas, transiently created in several tokamaks, have exhibited high performance as measured by normalized stored energy and neutron production rates. A critical issue with extending the duration of these plasmas is the need to maintain the off-axis-peaked current distribution required to support the minimum in the safety factor q at large radii. We present equilibrium and transport simulations that explore the use of electron cyclotron heating and current drive to maintain this negative shear configuration. Using parameters consistent with DIII-D tokamak operation, we find that with sufficiently high injected power, it is possible to achieve steady-state conditions employing well aligned electron cyclotron and bootstrap current drive in fully non-inductively current-driven configurations.},
doi = {},
url = {https://www.osti.gov/biblio/15004711}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 24 00:00:00 EDT 2003},
month = {Thu Apr 24 00:00:00 EDT 2003}
}

Conference:
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