HL—1M装置等离子体中类锯齿电子密度振荡

在欧姆放电和低杂波电流驱动（ＬＨＣＤ）及激光吹气注入杂质的联合实验中，首次在ＨＬ－１Ｍ 装置上观测到了与软Ｘ射线对应得非常好的锯齿型密度振荡。这种类锯齿型的密度振荡存在于低杂波电流驱动与激光吹气等离子体中。分析表明，该锯齿不是通常的ｑ ＝ １ 有理面上的锯齿，而是在低杂波与杂质共同作用下产生的类锯齿型的密度振荡。一种可能的机制是低杂波电流驱动下杂质的中心积累及崩塌引起的扰动磁场导致了快电子的损失，从而使得密度发生振荡

ELECTRON DENSITY SAWTOOTH LIKE OSCILLATIONS IN THE HL-1M TOKAMAK

The electron density sawtooth like oscillations,different from the normal sawtooth in the ohmic discharges,have been firstly observed during LHCD in the HL 1M tokamak discharges with impurities injected by laser blow off.Analysis shows that this sort of oscillations comes from the mutual effect of LHCD and impurities.A plausible mechanism is the cyclical loss of the superthermal electrons caused by the magnetic perturbation through the crash of the centrally accumulated impurities.