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Impurities and impurity transport in the spheromak SPHEX

G Cunningham1997年Plasma Physics and Controlled FusionIF 2.2出版社

Absolute spectroscopic measurements are made of all significant ionization states of the dominant impurities in SPHEX during sustained operation, and these are compared with a diffusive transport model to derive average plasma parameters. Statistical tests are used to establish the reliability of these results. A line ratio measure is also made and compares well with the ionization balance. The electron power balance in these discharges is estimated assuming that only Spitzer dissipation (a small fraction of the total source power) heats the electrons. Titanium gettering is used to reduce recycling, and thus to measure the fraction of impurity due to recycling relative to that directly injected from the Marshall gun. It is established that during sustainment the electrons are radiation dominated everywhere, so that the rise in when Ti is used is quite moderate, from 30 to 50 eV. However, the impurity transport rate is substantially reduced by gettering, implying that high transport rates are not intrinsic to the spheromak configuration. Some more qualitative data pertaining to the decaying spheromak is also presented.

日本語訳

SPHEXの定常運転中における主要不純物の全電離状態の分光測定を行い、これらを拡散輸送モデルと比較して平均プラズマパラメータを導出した。統計的検定を用いてこれらの結果の信頼性を確立した。また、線強度比の測定も行い、電離平衡と良好な一致を示した。これらの放電における電子パワーバランスは、電子を加熱するのはスピッツァー散逸のみ(全源パワーのごく一部)であると仮定して評価した。チタンゲッタリングを用いてリサイクリングを低減し、マーシャルガンから直接注入される不純物に対するリサイクリング由来の不純物の割合を測定した。定常維持期間中、電子は全域で放射損失支配であることが確立され、Ti使用時の電子温度上昇は30〜50 eVとかなり緩やかである。しかし、不純物輸送速度はゲッタリングにより大幅に低減され、高い輸送速度がスフェロマック配位に固有のものではないことが示唆される。減衰期のスフェロマックに関する定性的なデータも併せて提示する。

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