Ryter F, Angioni C, Peeters A G, Leuterer F, Fahrbach H-U, Suttrop W
Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany.
Phys Rev Lett. 2005 Aug 19;95(8):085001. doi: 10.1103/PhysRevLett.95.085001. Epub 2005 Aug 16.
Trapped electron modes are one of the candidates to explain turbulence driven electron heat transport observed in tokamaks. This instability has two characteristics: a threshold in normalized gradient and stabilization by collisions. Experiments using modulated electron cyclotron heating in the ASDEX Upgrade tokamak demonstrate explicitly the existence of the threshold. The stabilization with increasing collisionality is evidenced by a strong decrease of the propagation of heat pulses, explained by a transition to ion temperature gradient driven transport. These results are supported by linear gyrokinetic calculations.
捕获电子模是解释托卡马克中观测到的由湍流驱动的电子热输运的候选机制之一。这种不稳定性有两个特征：归一化梯度中的阈值和碰撞导致的稳定化。在ASDEX升级托卡马克中使用调制电子回旋加热的实验明确证明了阈值的存在。随着碰撞率增加而出现的稳定化表现为热脉冲传播的大幅下降，这是由向离子温度梯度驱动的输运转变所解释的。这些结果得到了线性回旋动理学计算的支持。
