The impact of the ITER-like wall at JET on disruptions
The impact of the ITER-like wall at JET on disruptions
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DOI：
10.1088/0741-3335/54/12/124032
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发表时间：
2012-12
影响因子：
2.2
通讯作者：
P. Vries;G. Arnoux;A. Huber;J. Flanagan;M. Lehnen;V. Riccardo;C. Reux;S. Jachmich;C. Lowry;G. Calabrò;D. Frigione;M. Tsalas;N. Hartmann;S. Brezinsek;M. Clever;D. Douai;M. Groth;T. Hender;E. Hodille;E. Joffrin;U. Kruezi;G. Matthews;J. Morris;R. Neu;V. Philipps;G. Sergienko;M. Sertoli;J. Contributors
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文献类型：
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作者：
P. Vries;G. Arnoux;A. Huber;J. Flanagan;M. Lehnen;V. Riccardo;C. Reux;S. Jachmich;C. Lowry;G. Calabrò;D. Frigione;M. Tsalas;N. Hartmann;S. Brezinsek;M. Clever;D. Douai;M. Groth;T. Hender;E. Hodille;E. Joffrin;U. Kruezi;G. Matthews;J. Morris;R. Neu;V. Philipps;G. Sergienko;M. Sertoli;J. Contributors
JET的新全金属ITER样墙（ILW）被发现对破坏的物理学产生了深远的影响。主要的区别是一个显着较低的分数（高达5倍）的能量辐射在中断过程中，产生更高的等离子体温度后的热淬火，从而更长的电流淬火时间。因此，总能量的较大部分传导到壁，导致较大的热负荷。为了避免铍在中等热能和磁能水平（即在2 MA的等离子体电流下）熔化，必须通过大量气体注入进行主动缓解。然而，较慢的电流猝灭降低了失控发电的风险。ILW的另一个有益效果是，中断对后续放电的形成和性能的影响可以忽略不计。
The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.