Enhanced production of runaway electrons during a disruptive termination of discharges heated with lower hybrid power in the Frascati Tokamak Upgrade.
Enhanced production of runaway electrons during a disruptive termination of discharges heated with lower hybrid power in the Frascati Tokamak Upgrade.
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DOI：
10.1103/physrevlett.97.165002
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发表时间：
2006-10
影响因子：
8.6
通讯作者：
J. R. Martin-Solis;B. Esposito;R. Sánchez;F. Poli;L. Panaccione
中科院分区：
文献类型：
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作者：
J. R. Martin-Solis;B. Esposito;R. Sánchez;F. Poli;L. Panaccione
我们报告了在弗拉斯卡蒂托卡马克升级装置中，用低杂化波加热的放电中断终止期间大量产生失控电子的观察结果。失控电流平台可以携带高达80%的破坏前电流，比在正常的欧姆破坏中更经常观察到。最大的失控电流对应于最慢的等离子体电流衰减率。这种趋势与在大多数托卡马克中观察到的相反。我们将这种反常行为归因于先前存在的波共振超热电子在破坏衰变阶段的加速。这些结果可能与ITER托卡马克的运行有关，只要有相当数量的低混合动力可用。
We report on the observation of a large production of runaway electrons during a disruptive termination of discharges heated with lower-hybrid waves at the Frascati Tokamak Upgrade. The runaway current plateaus, which can carry up to 80% of the predisruptive current, are observed more often than in normal Ohmic disruptions. The largest runaway currents correspond to the slowest plasma current decay rates. This trend is opposite to what is observed in most tokamaks. We attribute this anomalous behavior to the acceleration of the preexistent wave-resonant suprathermal electrons during the disruption decay phase. These results could be relevant for the operation of the ITER tokamak whenever a sizeable amount of lower-hybrid power is made available.