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Title: Ash and burn control through fishbones

The thermal alphas will accumulate in the center of the ignited thermonuclear plasma in the long pulse experiments. This accumulation increases the Z{sub eff} leading to increased synchrotron losses and decreases the effective fuel density which reduces the power output. Also the ignited plasma is burn-unstable and its temperature is expected to increase above the design point until a stable equilibrium is reached at a higher temperature. This higher operating temperature is not expected to be beneficial. Thus we are faced with the dual problem of ash accumulation and thermonuclear burn instability in the steadily burning tokamak plasma. So some means of controlling them is desirable. Several control schemes for both problems have been proposed. But it is felt that we need alternatives with more desirable characteristics. In this paper, we explore the use of fishbones' as possible scheme that will achieve the dual purpose of ash and burn control. 3 refs.
Authors:
;
Publication Date:
OSTI Identifier:
5397245
Report Number(s):
CONF-8901166-1
ON: DE90001564; TRN: 89-029776
DOE Contract Number:
FG02-86ER52127
Resource Type:
Conference
Resource Relation:
Conference: ITER burn control meeting, Livermore, CA (USA), Jan 1989
Research Org:
Illinois Univ., Urbana, IL (USA)
Sponsoring Org:
DOE/ER
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; IMPURITIES; CONTROL; ALPHA PARTICLES; FISHBONE INSTABILITY; ITER TOKAMAK; PLASMA HEATING; PLASMA MICROINSTABILITIES; WALL LOADING; CHARGED PARTICLES; CLOSED PLASMA DEVICES; HEATING; INSTABILITY; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; POWER DENSITY; THERMONUCLEAR DEVICES; TOKAMAK DEVICES 700101* -- Fusion Energy-- Plasma Research-- Confinement, Heating, & Production