Current driven due to localized electron power deposition in DIII-D

Conference · Sat May 01 00:00:00 EDT 1999

OSTI ID:353438

Harvey, R W ^[1]; Lin-Liu, Y R; Luce, T C; Prater, R ^[2]; Sauter, O ^[3]; Smirnov, A P ^[4]

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1. CompX, Del Mar, CA (United States)
2. General Atomics, San Diego, CA (United States)
3. Ecole Polytechnique Federale de Lausanne (Switzerland)
4. Moscow State Univ. (Russian Federation)

Due to spatial localization of electron cyclotron wave injection in DIII-D, electrons heated in an off-axis region must toroidally transit the tokamak 25--50 times before re-entering the heating region. This distance is of the order of the mean free path. The effect of such RF localization is simulated with a time-dependent Fokker-Planck code which is 2D-in-velocity, 1D-in-space-along-B, and periodic in space. An effective parallel electric field arises to maintain continuity of the driven current. Somewhat surprisingly, the localized current drive efficiency remains equal to that for a uniform medium.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States); Swiss National Science Foundation, Bern (Switzerland)
• DOE Contract Number: AC03-99ER54463
• OSTI ID: 353438
• Report Number(s): GA-A23137; CONF-990411-; ON: DE99002582; TRN: AHC29923%%271
• Resource Relation: Conference: 13. topical conference on applications of radio frequency power to plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: PBD: May 1999
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
DOUBLET-3 DEVICE
NON-INDUCTIVE CURRENT DRIVE
ELECTRON CYCLOTRON-RESONANCE
ENERGY ABSORPTION
TIME DEPENDENCE
COMPUTERIZED SIMULATION
EFFICIENCY
FOKKER-PLANCK EQUATION