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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.
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| 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))
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| Publication Date: | 1995 Mar 01 |
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| OSTI Identifier: | 6576644 |
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| DOE Contract Number: | AC02-76CH03073 |
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| Resource Type: | Journal Article |
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| Resource Relation: | Journal Name: Physics of Plasmas; (United States); Journal Volume: 2:3 |
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| Country of Publication: | United States |
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| Language: | English |
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| Format: | Size: Pages: 741-751 |
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| Other Number(s): | Journal ID: ISSN 1070-664X; CODEN: PHPAEN |
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| 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 |
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| Update Date: | 2009 Dec 17 |
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