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Observation of non-thermal electron formation during the thermal quench of shattered pellet injection shutdowns in DIII-D

E.M. Hollmann, D. Shiraki, L. Baylor, I. Bykov, N.W. Eidietis, I. Golovkin, J.L. Herfindal, A. Lvovskiy, A. McLean, R.A. Moyer2021年被引用 8Nuclear FusionIF 3出版社

Formation of non-thermal (hot) electrons is studied during the thermal quench of shattered pellet injection (SPI) discharge shutdowns in the DIII-D tokamak. Both pure neon and mixed neon/deuterium shutdowns are studied. High-energy radiation (SXR and EUV) brightness levels show indications of non-thermal electron formation during the TQ. The non-thermal densities are of order 1018 m−3 and non-thermal temperatures are estimated to be of order 10 keV. The non-thermal electrons appear to be mostly lost during the subsequent current quench, as no signal of relativistic runaway electrons is typically seen at the end of the current quench. The non-thermals appear to have an effect on the deposition profile of the SPI pellets, especially at the end of the TQ, due to increased pellet ablation.

日本語訳

非熱的(高温)電子の形成が、DIII-Dトカマクにおける破砕ペレット入射(SPI)による放電停止の熱的クエンチ中に研究された。純ネオンおよびネオン/重水素混合の両方の停止が研究された。高エネルギー放射(SXRおよびEUV)の輝度レベルは、TQ中の非熱的電子形成の兆候を示している。非熱的密度は10^18 m^-3のオーダーであり、非熱的温度は10 keVのオーダーと推定される。非熱的電子は、その後の電流クエンチ中に大部分が失われるようであり、電流クエンチの終了時には相対論的逃走電子の信号は通常見られない。非熱的電子は、特にTQの終了時において、ペレットアブレーションの増加により、SPIペレットの堆積分布に影響を及ぼしているようである。

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diii-d高精度(タイトル一致)

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DIII-DPellet injectionShattered pellet injection
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