Energy confinement experiments on Doublet III with high power neutral beam heating

Conference · Wed May 01 04:00:00 EDT 1985

OSTI ID:5403353

DeBoo, J C; Groebner, R J

Energy confinement experiments with up to 8 MW of both hydrogen and deuterium neutral beam power were performed in deuterium plasmas with limiter and expanded boundary divertor configurations. The results of NBI-dominated experiments indicated that total stored energy W/sub T/ and energy confinement time tau/sub E/ had little or no variation with electron density anti n/sub e/ and toroidal field B/sub T/ and scaled linearly with plasma current I/sub p/. Previous studies in limiter discharges indicated a weak dependence on plasma elongation kappa. The confinement time dependence on elongation was not determined for divertor discharges, but assuming a dependence similar to that for limiter discharges both limiter and divertor data were consistent with W/sub T/ and tau/sub E/ proportional to I/sub p/..sqrt..kappa. The variation of plasma stored energy with neutral beam power was consistent with a linear relationship. The linear equation describing this relationship had a non-zero intercept which illustrated the fact that energy confinement time deteriorated with neutral beam power. The energy confinement time appears to be approaching an asymptotic value at high power, consistent with a linear functional form for stored energy. However, a power law functional form for stored energy and energy confinement time can not be ruled out.

• Research Organization: GA Technologies, Inc., San Diego, CA (USA)
• DOE Contract Number: AC03-84ER51044
• OSTI ID: 5403353
• Report Number(s): GA-A-18033; CONF-850927-4; ON: DE85014324
• 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
CONFINEMENT
DEUTERIUM
DOUBLET-3 DEVICE
ELEMENTS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
LIMITERS
NEUTRAL ATOM BEAM INJECTION
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PLASMA CONFINEMENT
STABLE ISOTOPES