Helium transport and exhaust studies of H-mode discharges in the DIII-D tokamak
- Oak Ridge National Lab., TN (United States); and others
A collaborative program has been initiated to measure helium (He) transport and exhaust on DIII-D in L-mode, ELM-free H-mode, and ELMing H-mode. These diverted plasmas operating in enhanced confinement regimes should provide valuable information for the International Thermonuclear Experimental Reactor (ITER). To simulate the presence of He ash in DIII-D, a 50 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of {approximately} 15%. The time dependence of the He density profiles in the plasma core is measured with charge-exchange recombination spectroscopy and the He spatial distribution on the diverter floor is studied with an impurity monitor array. The dependence of core transport diffusivities as a function of ELM frequency have been studied and the first demonstration made of He exhaust from an H-mode plasma in a diverted tokamak. The exhaust rate of He from these ELMing H-mode plasmas appears to be within the acceptable range for a fusion reactor, like ITER, based on a measured value of {tau}*{sub He}/{tau}E {approx}14.
- Research Organization:
- Oak Ridge National Lab., TN (United States); General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400; AC03-89ER51114
- OSTI ID:
- 10111275
- Report Number(s):
- CONF-9311147-1; ON: DE94004744; BR: 35AT10020/AT0520210; TRN: 94:001541
- Resource Relation:
- Conference: IAEA meeting on H-mode physics,Naka (Japan),15-17 Nov 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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