Characterization of core impurity transport and accumulation in various operating regimes in DIII-D [electronic resource]
Impurity contaminants in the core plasma of future burning devices such as the International Thermonuclear Experimental Reactor (ITER) are inevitable and will undoubtedly have a deleterious effect on plasma performance. Unfortunately, because of the limited amount of information available, the model...
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Online Access |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Energy. Office of Energy Research ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1996.
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| Summary: | Impurity contaminants in the core plasma of future burning devices such as the International Thermonuclear Experimental Reactor (ITER) are inevitable and will undoubtedly have a deleterious effect on plasma performance. Unfortunately, because of the limited amount of information available, the models presently being used to predict ITER performance simply assume a flat concentration profile for all impurities with an ad hoc concentration chosen for each impurity. In an attempt to start closing the gap between present experimental data and these models, experiments have been conducted on DIII-D with particular emphasis placed on (1) characterizing the buildup of intrinsic impurities in the plasma core in various confinement and divertor regimes; (2) measuring the steady-state impurity density profiles in various operating regimes; and (3) determining whether impurity transport properties are dependent on the charge of the impurity. The primary focus of these studies has been on characterizing impurity buildup in a wide variety of operating conditions in ELMing H-mode plasmas. However, enhanced confinement regimes such as ELM-free H-mode, VH-mode, and the negative central shear (NCS) regime offer the potential of a more attractive reactor scenario. Since the degree of impurity accumulation will have a significant impact on the attractiveness of these regimes, studies have also been conducted to characterize impurity buildup in these regimes. In the present configuration of DIII-D in which graphite tiles cover {approximately} 90% of the plasma facing surface, spectroscopic surveys show carbon to be the dominant impurity with the core carbon concentration typically between 1--3% of the electron density. |
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| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 07/01/1996. "GA--A22404" "CONF-9606226--11" "DE97003364" 23. European Physical Society conference on controlled fusion and plasma physics, Kiev (Ukraine), 24-28 Jun 1996. Wood, R.D.; Wade, M.R.; West, W.P.; Whyte, D.G. General Atomics, San Diego, CA (United States) California Univ., San Diego, La Jolla, CA (United States) |
| Physical Description: | 7 p. |