Sawtooth crashes of large amplitude are detrimental to tokamak plasma confinement, and the amplitude has to be reduced for a fusion reactor. A novel method, i.e. applying m / n = 2/2 resonant magnetic perturbations (RMPs), is found to be able to reduce the sawtooth magnitude in J-TEXT tokamak experiments. The penetration of RMPs and formation of 2/2 locked island are found to be related to the reduction of sawtooth magnitude. With the available 2/2 RMP field, the sawtooth mitigation is reproducibly achieved with q a < 2.8 and n e < 2 × 10 19 m −3 in J-TEXT.

中文翻译：

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通过共振磁扰动降低锯齿波幅度

较大幅度的锯齿碰撞不利于托卡马克等离子体的束缚，对于聚变反应堆必须减小幅度。在J-TEXT托卡马克实验中，发现了一种新颖的方法，即应用m / n = 2/2共振磁扰动（RMP），可以减小锯齿幅度。发现RMP的渗透和2/2锁定岛的形成与锯齿幅度的减小有关。借助可用的2/2 RMP字段，在J-TEXT中使用qa <2.8和ne <2×10 19 m -3可重复实现锯齿缓解。