Martín-Solís J R, Esposito B, Sánchez R, Poli F M, Panaccione L
Departamento de Física, Universidad Carlos III de Madrid, Leganés, Madrid, Spain.
Phys Rev Lett. 2006 Oct 20;97(16):165002. doi: 10.1103/PhysRevLett.97.165002. Epub 2006 Oct 18.
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.
我们报告了在弗拉斯卡蒂托卡马克升级装置中，用低杂波加热的放电在破裂终止期间大量产生逃逸电子的观测结果。观测到的逃逸电流平台可承载高达预破裂电流的80%，且比正常欧姆破裂情况更常出现。最大的逃逸电流对应着最慢的等离子体电流衰减率。这一趋势与大多数托卡马克中观测到的情况相反。我们将这种异常行为归因于破裂衰减阶段中先前存在的波共振超热电子的加速。每当有相当数量的低杂波功率可用时，这些结果可能与国际热核聚变实验堆（ITER）托卡马克的运行相关。
