Active core profile and transport modification by application of ion Bernstein wave power in the Princeton Beta Experiment-Modification

Journal Article · Wed Mar 01 00:00:00 EST 1995 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.871426· OSTI ID:6576644

LeBlanc, B; Batha, S; Bell, R; Bernabei, S; Blush, L; de la Luna, E; Doerner, R; Dunlap, J; England, A; Garcia, I; Ignat, D; Isler, R; Jones, S; Kaita, R; Kaye, S; Kugel, H; Levinton, F; Luckhardt, S; Mutoh, T; Okabayashi, M ; Ono, M; Paoletti, F; Paul, S; Petravich, G; Post-Zwicker, A; Sauthoff, N; Schmitz, L; Sesnic, S; Takahashi, H; Talvard, M; Tighe, W; Tynan, G; von Goeler, S; Woskov, P; Zolfaghari, A ^[1]

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1. Princeton University, Plasma Physics Laboratory, Forrestal Campus, P.O. Box 451, Princeton, New Jersey 08543 (United States)

Application of Ion Bernstein Wave Heating (IBWH) into the Princeton Beta Experiment-Modification (PBX-M) [Phys. Fluids B [bold 2], 1271 (1990)] tokamak stabilizes sawtooth oscillations and generates peaked density profiles. A transport barrier, spatially correlated with the IBWH power deposition profile, is observed in the core of IBWH-assisted neutral beam injection (NBI) discharges. A precursor to the fully developed barrier is seen in the soft x-ray data during edge localized mode (ELM) activity. Sustained IBWH operation is conducive to a regime where the barrier supports large [del][ital n][sub [ital e]], [del][ital T][sub [ital e]], [del][nu][sub [phi]], and [del][ital T][sub [ital i]], delimiting the confinement zone. This regime is reminiscent of the H(high) mode, but with a confinement zone moved inward. The core region has better than H-mode confinement while the peripheral region is L(low)-mode-like. The peaked profile enhances NBI core deposition and increases nuclear reactivity. An increase in central [ital T][sub [ital i]] results from [chi][sub [ital i]] reduction (compared to the H mode) and better beam penetration. Bootstrap current fractions of up to 0.32--0.35 locally and 0.28 overall were obtained when an additional NBI burst is applied to this plasma.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 6576644
• Journal Information: Physics of Plasmas; (United States), Vol. 2:3; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TOKAMAK DEVICES
BERNSTEIN MODE
BOOTSTRAP CURRENT
MAGNETIC CONFINEMENT
PLASMA HEATING
PLASMA PRESSURE
RADIOWAVE RADIATION
RESONANCE
CLOSED PLASMA DEVICES
CONFINEMENT
CURRENTS
ELECTRIC CURRENTS
ELECTROMAGNETIC RADIATION
HEATING
OSCILLATION MODES
PLASMA CONFINEMENT
RADIATIONS
THERMONUCLEAR DEVICES
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)