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通过一些特殊方法,HT-6M托卡马克可以稳定运行在只带少量过热电子的超低密度(SLD)区域。其主要参数为:N_e=(0.2～0.6)×10~(13)cm~(-3);I_p=60～80kA;V_o=0.7～2.0V;B_t=0.7～1.0T;a=18cm;R=63cm。在这类放电中,等离子体的密度由限制器和壁的出气量决定,而和初始充的氢气压强完全无关。等离子体是安静的,几乎没有“锯齿振荡”。m=2,3的磁流体力学(MHD)不稳定性只出现在电流下降段。径向温度分布T_o(r)峰化,而密度分布N_e(r)是平坦的。能量约束时间τ_e为1～2ms,大约是Alcator定标律的2～4倍。
With some special methods, the HT-6M tokamak can operate stably in very low density (SLD) areas with only a few overheated electrons. The main parameters are as follows: N_e = (0.2-0.6) × 10-13 cm -3; I_p = 60-80kA; V_o = 0.7-2.0V; B_t = 0.7-1.0T; a = 18cm; R = 63cm. In this type of discharge, the density of the plasma is governed by the output of the restrictor and the wall and is completely independent of the initial charge of hydrogen. The plasma is quiet with few jagged oscillations. Magnetohydrodynamics (MHD) instability with m = 2, 3 only appears at the current drop. The radial temperature distribution T_o (r) peaks while the density distribution N_e (r) is flat. Energy constraint time τ_e is 1 ~ 2ms, which is about 2 ~ 4 times of Alcator’s calibration law.