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Long-pulse plasma discharge on the Large Helical Device

R. Kumazawa, T. Mutoh, K. Saito, T. Seki, Y. Nakamura, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Igami, K. Ohkubo2006年被引用 19Nuclear FusionIF 3出版社

A long-pulse plasma discharge of more than 30 min duration was achieved on the Large Helical Device (LHD). A plasma of ne = 0.8 × 1019 m−3 and Ti0 = 2.0 keV was sustained with PICH = 0.52 MW, PECH = 0.1 MW and averaged PNBI = 0.067 MW. The total injected heating energy was 1.3 GJ. One of the keys to the success of the experiment was a dispersion of the local plasma heat load to divertors, accomplished by sweeping the magnetic axis inward and outward. Causes limiting the long pulse plasma discharge are discussed. An ion impurity penetration limited further long-pulse discharge in the 8th experimental campaign (2004).

日本語訳

大型ヘリカル装置(LHD)において、30分を超える長時間プラズマ放電が達成された。ne = 0.8 × 10^19 m^-3、Ti0 = 2.0 keVのプラズマが、PICH = 0.52 MW、PECH = 0.1 MW、平均PNBI = 0.067 MWによって維持された。投入加熱エネルギーの総量は1.3 GJであった。実験成功の鍵の一つは、磁気軸を内外に掃引することによるダイバータへの局所熱負荷の分散であった。長時間プラズマ放電を制限する要因について考察する。第8次実験キャンペーン(2004年)において、不純物の侵入がさらなる長時間放電を制限した。

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