Recent results from the ATF torsatron

Journal Article · Thu Aug 01 04:00:00 EDT 1991 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859645· OSTI ID:5652125

Murakami, M; Aceto, S C; Anabitarte, E; Anderson, D T; Anderson, F S.B.; Batchelor, D B; Branas, B; Baylor, L R; Bell, G L; Bell, J D; Bigelow, T S; Carreras, B A; Colchin, R J; Crocker, N A; Crume, Jr, E C; Dominguez, N; Dory, R A; Dunlap, J L; Dyer, G R; England, A C ; Fowler, R H; Gandy, R F; Glowienka, J C; Goldfinger, R C; Goulding, R H; Hanson, G R; Harris, J H; Hidalgo, C; Hillis, D L; Hiroe, S; Hirshman, S P; Horton, L D; Howe, H C; Hutchinson, D P; Isler, R C; Jernigan, T C; Kaneko, H; Kwon, M; Langley, R A; Leboeuf, J N; Lee, D K; Lo, D H.C.; Lynch, V E; Lyon, J F; Ma, C H; Menon, M M; Mioduszewski, P K; Morita, S; Morris, R N; Neilson, G H; Ochando, M A; Okamura, S; Paul, S; Qualls, A L; Rasmussen, D A; Richards, R K; Ritz, C P; Rome, J A; Sanchez, J; Schwelberger, J G; Shaing, K C; Shepard, T D; Simpkins, J E; Thomas, C E; Tolliver, J S; Uckan, T; Vander Sluis, K L; Wade, M R; Wilgen, J B; Wing, W R; Yamada,

Recent experiments in the Advanced Toroidal Facility (ATF) torsatron ({ital Plasma} {ital Physics} {ital and} {ital Controlled} {ital Nuclear} {ital Fusion} {ital Research} 1990 (IAEA, Vienna, in press)) have emphasized the role of magnetic configuration control in transport studies. Long-pulse plasma operation up to 20 sec has been achieved with electron cyclotron heating (ECH). With neutral beam injection (NBI) power of {ge}1 MW, global energy confinement times of 30 msec have been obtained with line-average densities up to 1.3{times}10{sup 20} m{sup {minus}3}. The energy confinement and the operational space in ATF are roughly the same as those in tokamaks of similar size and field. The empirical scaling observed is similar to gyro-reduced Bohm scaling with favorable dependences on density and field offsetting an unfavorable power dependence. The toroidal current measured during ECH is identified as the bootstrap current. The observed currents agree well with predictions of neoclassical theory in magnitude and in parametric dependence. Variations of the magnetic configuration in discharges heated by ECH alone and by NBI change plasma transport and plasma profiles. Magnetic fluctuations respond to the concomitant pressure profile variations. Comparative studies of edge fluctuations in the Texas experimental tokamak (TEXT) ({ital Plasma} {ital Physics} {ital and} {ital Controlled} {ital Nuclear} {ital Fusion} {ital Research} 1990 (IAEA, Vienna, in press)) and the ATF stellarator showed remarkable similarity in the levels of fluctuations and the existence of a velocity shear layer.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5652125
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 3:8; ISSN PFBPE; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
700103 -- Fusion Energy-- Plasma Research-- Kinetics
ATF TORSATRON
BEAM INJECTION
BOOTSTRAP CURRENT
CHARGED-PARTICLE TRANSPORT
CLOSED PLASMA DEVICES
CONFINEMENT
CURRENTS
ECR HEATING
ELECTRIC CURRENTS
END EFFECTS
FLUCTUATIONS
HEATING
HIGH-FREQUENCY HEATING
MAGNETIC FIELD CONFIGURATIONS
NEUTRAL ATOM BEAM INJECTION
PLASMA
PLASMA CONFINEMENT
PLASMA HEATING
RADIATION TRANSPORT
STELLARATORS
TEXT DEVICES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TORSATRON STELLARATOR
VARIATIONS