High beta improvement and current drive in spherical tokamaks by neutral particle Injection

在球形托卡马克中，同轴等离子体发生器的等离子体注入由于宽高比低而无法获得大的伏秒。目前，使用现有电源，测试- m的伏秒为25mv。降低击穿的伏秒是很重要的，因为等离子体应该利用有限的伏秒有效地加热。为此进行了同轴等离子体枪等离子体注射试验。等离子体起始时间从0.8 ms减少到0.5 ms。等离子体电流从8ka增加到14ka。实验证明，同轴等离子体枪注入等离子体有助于降低伏秒消耗。

Plasma injection by coaxial plasma gunIt is impossible to have large volt second in spherical tokamak because of low aspect ratio. Presently, volt second of TST-M is 25 mVs using the present power supply. It is important to reduce the volt second for the breakdown, because plasma should be heated efficiently using the limited volt second.Plasma injection by coaxial plasma gun has been tested for this purpose. The time for the plasma initiation is reduced from 0.8 ms to 0.5 ms. Plasma current increases from 8 kA to 14 kA.It has been proved that the plasma injection by coaxial plasma gun helps volt second consumption.