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Conversion of magnetic energy to runaway kinetic energy during the termination of runaway current on the J-TEXT tokamak

A J Dai, Z Y Chen, D W Huang, R H Tong, J Zhang, Y N Wei, T K Ma, X L Wang, H Y Yang, H L Gao2018年Plasma Physics and Controlled FusionIF 2.2出版社

A large number of runaway electrons (REs) with energies as high as several tens of mega-electron volt (MeV) may be generated during disruptions on a large-scale tokamak. The kinetic energy carried by REs is eventually deposited on the plasma-facing components, causing damage and posing a threat on the operation of the tokamak. The remaining magnetic energy following a thermal quench is significant on a large-scale tokamak. The conversion of magnetic energy to runaway kinetic energy will increase the threat of runaway electrons on the first wall. The magnetic energy dissipated inside the vacuum vessel (VV) equals the decrease of initial magnetic energy inside the VV plus the magnetic energy flowing into the VV during a disruption. Based on the estimated magnetic energy, the evolution of magnetic-kinetic energy conversion are analyzed through three periods in disruptions with a runaway current plateau.

日本語訳

大規模トカマクにおけるディスラプション中に、数十メガ電子ボルト(MeV)ものエネルギーを持つ多数の逃走電子(RE)が生成される可能性がある。REが運ぶ運動エネルギーは最終的にプラズマ対向部品に堆積し、損傷を引き起こしてトカマクの運転に脅威をもたらす。大規模トカマクでは、熱クエンチ後の残留磁気エネルギーは無視できない。磁気エネルギーから逃走運動エネルギーへの変換は、第一壁に対する逃走電子の脅威を増大させる。真空容器(VV)内で散逸する磁気エネルギーは、ディスラプション中にVV内の初期磁気エネルギーの減少分に、VV内へ流入する磁気エネルギーを加えたものに等しい。推定された磁気エネルギーに基づき、逃走電流プラトーを伴うディスラプションにおいて、磁気-運動エネルギー変換の時間発展を3つの期間に分けて解析する。

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