Attainment of quasi steady-state H-mode plasmas in the DIII-D tokomak

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6488832

Mahdavi, M A; Kellman, A G; Gohil, P; Brooks, N; Burrell, K H; Groebner, R J; Haas, G; Hill, D; Jackson, G; Janeschitz, G

We report the results of experiments on DIII-D where quasi steady-state H-mode plasma with low amplitude Edge Localized Modes (ELMs) were maintained for 5 seconds. Within one second from the onset of the H-mode, most plasma parameters reach their asymptotic values (/bar n//sub e/ approx. 7 /times/ 10/sup 13/ cm/sup /minus/3/, /tau//sub E/ approx. = 100 ms, Z/sub eff/ = 1.7) and the electron density and temperature profiles are no longer evolving. By this time, frequent ELMs and effective helium wall conditioning limit the rate of increase of /bar n//sub e/ (less than or equal to10% of the beam fueling rate) and maintain the total radiated power form impurities at a constant level. 5 refs., 2 figs.

• Research Organization: General Atomics, San Diego, CA (USA)
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 6488832
• Report Number(s): GA-A-19558; CONF-890302-10; ON: DE89006915
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101* -- Fusion Energy-- Plasma Research-- Confinement
Heating
& Production
BEAM INJECTION
CLOSED PLASMA DEVICES
CONFINEMENT
CONFINEMENT TIME
DOUBLET-3 DEVICE
ELECTRON DENSITY
ELECTRON TEMPERATURE
IMPURITIES
NEUTRAL ATOM BEAM INJECTION
PLASMA CONFINEMENT
THERMONUCLEAR DEVICES
TOKAMAK DEVICES