Perpendicular ion acceleration during ICRF, LHRF and ECH experiments in toroidal plasmas in the UCLA CCT device

Conference · Sat Jul 01 00:00:00 EDT 1989 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6476572

Evans, J D; Morales, G J; Taylor, R J ^[1]

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1. University of California, Los Angeles, CA (USA)

Measurements of the fast neutral flux in the CCT (Continuous Current Tokamak) device in ICRF-, LHRF-, and ECH-produced plasmas show a common feature: fast ion tails (E{sub i}/T{sub i}{approx}100) with large ratios of perpendicular-to-parallel energy (E{sub {perpendicular}}/E{sub {parallel}}{approx} 100). Perpendicular fast ion production is particularly strong during fast wave RF operation, regardless of driver frequency, but enhanced ion generation has been observed at {omega}=n{Omega}{sub i}, up to n=7. Superthermal ion tails (E{sub i}/T{sub i}{approx}20) are also present in high-harmonic ICRF-heated tokamak discharges, but the ion distribution function relaxes towards isotropy in pitch angle due to improved ion confinement. In all of the above plasma, the perpedicularity of the fast ion distribution increases with energy.

• OSTI ID: 6476572
• Report Number(s): CONF-8905120-; CODEN: APCPC; TRN: 90-032485
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 190:1; Conference: 8. topical conference on radio frequency power in plasmas, Irvine, CA (USA), 1-3 May 1989; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TOKAMAK DEVICES
PLASMA ACCELERATION
DISTRIBUTION FUNCTIONS
ECR HEATING
ICR HEATING
IONIZATION
LOWER HYBRID HEATING
PLASMA CONFINEMENT
ACCELERATION
CLOSED PLASMA DEVICES
CONFINEMENT
FUNCTIONS
HEATING
HIGH-FREQUENCY HEATING
PLASMA HEATING
THERMONUCLEAR DEVICES
700101* - Fusion Energy- Plasma Research- Confinement
Heating
& Production