CONFINEMENT AND BETA-P STUDIES IN NEUTRAL INJECTION HEATED ASDEX PLASMAS
Neutral injection experiments into limiter and divertor discharges in ASDEX are described with hydrogen and deuterium as working gas. Two operational regimes have been observed in neutral injection heated divertor discharges. One regime is characterized by deteriorated energy and particle confinement. The global energy confinement times are comparable to those of neutral injection heated limiter discharges. The other regime has particle and energy confinement times comparable to those of ohmic discharges with tau-E = 40 - 60 msec at beam powers up to 3.1 MW. This regime is further characterized by high ss-p values comparable to the aspect ratio A (ss-p +- 0.65 A), by good electron heating (eta-e +- 2.5 x 10**13 eV cm**-3 kW**-1) and ion heating (eta-i +- 4.2 x 10**13 eV cm**-3 kW**-1). In both regimes, tau-E increases with plasma current but there is hardly any variation with density.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP 111/86, 1983
Record Number: 1989122019500 / Last updated on: 1987-01-01
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