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Detached plasma control by H- / D- negative ion in divertor simulator
akira Tonegawa,Hiroyuki YAZAWA,Kazutaka KAWAMURA,Masataka ONO,Syusaku MAETA 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
We have developed a new way to stably maintain a detached hydrogen or deuterium plasma based on feedback control of the relative negative-ion (H.or D.) density in the linear divertor plasma simulator, TPD-SheetIV. Measurements of the relative negative ion density, nH.or nD., 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. The detached plasma is steadily maintained in the region of the target plate by rapidly varying Gdiv so as to maximize the value of the n.Hor n.Dand to keep the gas pressure constant. The new system has achieved the goal of reducing both Q and the amount of Gdiv in a detached plasma without radiative and three-body recombination processes.