Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9793854 | Journal of Nuclear Materials | 2005 | 5 Pages |
Abstract
We have developed a new way to stably maintain a detached plasma based on feedback control of the negative hydrogen ion (Hâ) density in the linear divertor plasma simulator, TPD-SheetIV. Measurements of the negative hydrogen ion density, nHâ, the heat load to the target plate, Q, and the secondary gas-flow rate, GDiv, were carried out as a function of neutral pressure in the plasma. A small amount of secondary gas puffing strongly reduced Q and rapidly increased nHâ in the periphery of the plasma without increased radiative and three-body recombination. The detached plasma is steadily maintained in the region of the target plate by rapidly varying GDiv so as to maximize the value of nHâ and keep PDiv constant. The new system has achieved the goal of reducing both Q and amount of GDiv in a detached plasma.
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Authors
M. Ono, A. Tonegawa, K. Kumita, T. Shibuya, K. Kawamura,