Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks
- Oak Ridge National Lab., TN (United States)
- Association Euratom-Kernforschungsanlage Juelich GmbH (Germany)
- General Atomics, San Diego, CA (United States)
Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarizing electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarization induced H-mode. Since these results imply that a high He pumping efficiency may be necessary for H-mode burning plasmas, we have begun exploring He transport in a divertor H-mode, similar to that proposed for International Thermonuclear Experimental Reactor (ITER). A collaborative program has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma resulting in a He concentration of {approx}5%. The time dependence of the He{sup 2+} density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-89ER51114; AC05-84OR21400
- OSTI ID:
- 7276051
- Report Number(s):
- GA-A-20901; CONF-920311-20; ON: DE92016247
- Resource Relation:
- Conference: 10. international conference on plasma-surface interactions in controlled fusion devices, Monterey, CA (United States), 30 Mar - 3 Apr 1992
- Country of Publication:
- United States
- Language:
- English
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Helium transport and exhaust studies of H-mode discharges in the DIII-D tokamak
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Related Subjects
H-MODE PLASMA CONFINEMENT
CHARGED-PARTICLE TRANSPORT
HELIUM ASH
DOUBLET-3 DEVICE
EDGE LOCALIZED MODES
ELECTRON DENSITY
ELECTRON TEMPERATURE
PLASMA DENSITY
PLASMA DIAGNOSTICS
SPECTROSCOPY
TEXTOR TOKAMAK
THOMSON SCATTERING
CHARGED PARTICLES
CLOSED PLASMA DEVICES
CONFINEMENT
HELIUM IONS
INELASTIC SCATTERING
INSTABILITY
IONS
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATION TRANSPORT
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700330* - Plasma Kinetics
Transport
& Impurities- (1992-)
700310 - Plasma Confinement- (1992-)