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Radiation losses and global power balance of JT-60 plasmas

T. Nishitani, K. Itami, K. Nagashima, S. Tsuji, N. Hosogane, H. Yoshida, T. Ando, H. Kubo, H. Takeuchi1990年被引用 16Nuclear FusionIF 3出版社

The radiation losses and the global power balance for Ohmic and neutral beam heated plasmas have been investigated in different JT-60 configurations. Discharges with a TiC coated molybdenum wall and with a graphite wall, with limiter, outer and lower X-point configurations have been studied by bolometric measurements, thermocouples and an infrared TV camera. In neutral beam heated outer X-point discharges with a TiC coated molybdenum first wall, the radiation loss of the main plasma was very low (10% of the absorbed power). The radiation loss due to oxygen was dominant in this case. On the contrary, in discharges with TiC coated molybdenum limiters the radiation loss was very high (>60% of the absorbed power). In the discharges with a graphite wall the radiated power from the main plasma was 20-25% for both limiter and lower X-point configurations. In lower X-point discharges the main contributor to the radiation loss was oxygen, whereas in limiter discharges the loss due to carbon was equal to the loss due to oxygen. The radiation loss from the lower X-point divertor increased with increasing electron density of the main plasma.

日本語訳

オーミック加熱および中性粒子ビーム加熱プラズマにおける放射損失と全体のパワーバランスを、JT-60の異なる配位において調査した。TiC被覆モリブデン壁およびグラファイト壁を有する放電を、リミター配位、外側ダイバータ配位、およびその他の配位で、ボロメータ測定、熱電対、および赤外線TVカメラを用いて研究した。TiC被覆モリブデン第一壁を有する中性粒子ビーム加熱外側ダイバータ放電では、主プラズマの放射損失は非常に低く(吸収パワーの10%)、この場合の放射損失は酸素によるものが支配的であった。対照的に、TiC被覆モリブデンリミターを有する放電では、放射損失は非常に高く(吸収パワーの60%超)、グラファイト壁を有する放電では、主プラズマからの放射パワーはリミター配位および外側ダイバータ配位の両方で20〜25%であった。外側ダイバータ放電では、放射損失の主な要因は酸素であり、リミター放電では炭素による損失が酸素による損失と同等であった。外側ダイバータからの放射損失は、主プラズマの電子密度の増加とともに増加した。

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jt-60sa高精度(タイトル一致)

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JT-60Ion loss
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