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Report No.
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Light elements behavior in fusion devices studied with JT-60 and oxygen discharge

Konishi, Satoshi*; Nakamura, Hirofumi ; Isobe, Kanetsugu; Yamamoto, Yasushi*; Kaminaga, Atsushi

In order to understand the behavior of hydrogen isotopes, carbon, and oxygen in the fusion devices, and to develop effective method to control codeposite and tritium inventory, exhaust gas from JT-60 was analyzed. Unsaturated hydrocarbons such as acetylene was found in tokamak exhaust, suggesting relation with codeposite formation. Oxygen-helium glow discharge in JT-60 indicated enhanced carbon removal corresponding to sputtering yield of 2.5 for carbon per oxygen ion. Simulating discharge experiment in a small chamber with carbon electrodes also reproduced codeposition by acetylene discharge and its removal by O$$_{2}$$-He glow.

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