Enhancement of D- Negative Ion Volume Production in Pure Deuterium Plasmas

Fukumasa, O.; Nakano, T.; Mori, S.; Oohara, W.; Tsumori, K.; Takeiri, Y.
March 2009
AIP Conference Proceedings;3/12/2009, Vol. 1097 Issue 1, p118
Academic Journal
Pure volume production of D- negative ions is studied in rectangular negative ion source equipped with an external magnetic filter (MF). Plasma parameters (ne and Te) in D2 plasmas are varied mainly in the downstream region by changing the magnetic field intensity of the MF (i.e., BMF). Production and control of D2 plasma is nearly the same as that of H2 plasmas, although the values of ne and Te in D2 plasma are slightly higher than that of H2 plasmas in both the source and the extraction regions. On D-/H- production, however, it appears some different points. By varying the BMF, H- production in the extraction region is remarkably changed corresponding to the variation of ne and Te in the extraction region. On the other hand, D- production is not so varied under the same discharge conditions in H2 plasmas. This difference in D- production is not well explained only variation of ne and Te in D2 plasmas. Optimum BMF and gas pressure for D- production is slightly higher than that for H- production.


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