The influence of circulating energetic ions (CEIs) on double tearing mode (DTM) is investigated by a global kinetic-MHD hybrid simulation. It is shown that the co-CEIs with a small orbit width have a destabilizing effect on the DTM. As the orbit width increases, this destabilizing effect is reduced. If the orbit width is large enough, the DTM is transformed to single tearing modes due to the co-CEIs, so the mode becomes more stable than the DTM without CEIs. The effect of the counter-CEIs with small orbit width is similar to that of the co-CEIs. For a large orbit width, the counter-CEIs also have a stabilizing effect. If the energetic ion beta is larger than a threshold, an energetic particle driven mode (EPM) is excited due to the resonance between counter-CEIs and the bulk plasma. The effects of energetic ion beta, orbit width and resistivity on this EPM are studied systematically. The onset threshold of EPM depends on the orbit width and resistivity. It decreases with orbit width increasing, while it increases with resistivity increasing. The mode transition from DTM to EPM with energetic ion beta increasing is also found for large orbit width.
circulating energetic ions (CEIs) 对双撕裂模 (DTM) 的影响通过全局动理学-磁流体混合模拟进行了研究。结果表明，具有小轨道宽度的同向CEIs对DTM有去稳作用。随着轨道宽度的增加，这种去稳作用减弱。如果轨道宽度足够大，同向CEIs会使DTM转化为单撕裂模，从而使模比无CEIs时的DTM更稳定。具有小轨道宽度的反向CEIs的作用与同向CEIs相似。对于大轨道宽度，反向CEIs也具有稳定作用。当高能离子β大于阈值时，由于反向CEIs与背景等离子体之间的共振，会激发高能粒子驱动模 (EPM)。系统研究了高能离子β、轨道宽度和电阻率对该EPM的影响。EPM的激发阈值依赖于轨道宽度和电阻率：它随轨道宽度增大而减小，随电阻率增大而增大。对于大轨道宽度，还发现了随着高能离子β增大，模从DTM向EPM的转变。