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The behavior of neutron emissions during ICRF minority heating of plasma at EAST

Guoqiang Zhong, Hongrui Cao, Liqun Hu, Ruijie Zhou, Min Xiao, Kai Li, Neng Pu, Juan Huang, Guangzhu Liu, Shiyao Lin2016年Plasma Physics and Controlled FusionIF 2.2出版社

Ion cyclotron radio frequency (ICRF) wave heating is a primary method to heat ions in the Experimental Advanced Superconducting Tokamak (EAST). Through neutron diagnostics, effective ion heating was observed in hydrogenminority heating (MH) scenarios. At present, investigation of deuterium–deuterium (DD) fusion neutrons is mostly based on time-resolved flux monitor and spectrometer measurements. When the ICRF was applied, the neutron intensity became one order higher. The H/H  +  D ratio was in the range of 5–10%, corresponding to the hydrogen MH dominated scenario, and a strong high energy tail was not displayed on the neutron spectrum that was measured by a liquid scintillator. Moreover, ion temperature in the plasma center (Ti) was inversely calculated by the use of neutron source strength (Sn) and the plasma density based on classical fusion reaction equations. This result indicates that Ti increases by approximately 30% in L-mode plasma, and by more than 50% in H-mode plasma during ICRF heating, which shows good agreement with x-ray crystal spectrometer (XCS) diagnostics. Finally, the DD neutron source strength scaling law, with regard to plasma current (IP) and ICRF coupling power (PRF) on the typical minority heating condition, was obtained by statistical analysis.

日本語訳

イオンサイクロトロン周波数(ICRF)波加熱は、実験先進超伝導トカマク(EAST)においてイオンを加熱する主要な方法である。中性子診断を通じて、水素少数派加熱(MH)シナリオにおいて効果的なイオン加熱が観測された。現在、重水素–重水素(DD)核融合中性子の調査は、主に時間分解フラックスモニターとスペクトロメーター測定に基づいている。ICRFが印加されたとき、中性子強度は一桁高くなった。H/H+D比は5〜10%の範囲にあり、水素MH支配シナリオに対応し、液体シンチレーターで測定された中性子スペクトルには強い高エネルギー尾部は示されなかった。さらに、プラズマ中心部のイオン温度(Ti)は、古典的な核融合反応式に基づいて、中性子源強度(Sn)とプラズマ密度を用いて逆算された。この結果は、ICRF加熱中にLモードプラズマではTiが約30%増加し、Hモードプラズマでは50%以上増加することを示しており、X線結晶分光器(XCS)診断と良好な一致を示している。最後に、典型的な少数派加熱条件におけるDD中性子源強度のスケーリング則は、プラズマ電流(IP)とICRF結合パワー(PRF)に関して統計解析により得られた。

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EASTIon cyclotron heatingNeutron emission
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