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

Description/Abstract

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.

Authors: 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. (Princeton University, Plasma Physics Laboratory, Forrestal Campus, P.O. Box 451, Princeton, New Jersey 08543 (United States))
Publication Date:1995 Mar 01
OSTI Identifier: 6576644
DOE Contract Number:AC02-76CH03073
Resource Type:Journal Article
Resource Relation:Journal Name: Physics of Plasmas; (United States); Journal Volume: 2:3
Country of Publication:United States
Language:English
Format: Size: Pages: 741-751
Other Number(s):Journal ID: ISSN 1070-664X; CODEN: PHPAEN
Subject: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
Update Date:2009 Dec 17

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