Fuel injector for spherical tokamak using helicon wave

本研究的目的是研究和开发使用球形托卡马克TST-M（东京球形托卡马克改进型）的燃料喷射器.在8 MHz、10 kW微波源上进行的内环天线实验中，没有观察到明显的效果. TST-M真空容器内设置3匝感应线圈。等离子体生产方案得到了很大的改进，因此现在可以大量使用。高频波（2.45GHz，5 kW）通过真空窗耦合到等离子体。TST-M中的感应线圈实验：在TST-M真空室中放置3匝感应线圈。目的是：1）通过感应线圈进行预电离，以便有效地利用来自OH线圈的伏秒来进行等离子体加热。用感应线圈产生转向等离子体，等离子体电流从40 kA增加到55 kA，放电持续时间增加到6 ms，可见光诊断证实感应线圈周围产生等离子体，从而证实感应线圈工作在球形托卡马克中是有用的。

The purpose of this study is the research and development of fuel injector using the spherical tokamak TST-M (Tokyo Spherical Tokamak-modified).1. Remarkable effects have not observed in the experiments of internal ring antenna using 8MHz, 10kw oscillator.2. Induction coils of 3 turns have been set inside TST-M vacuum vessel. Plasma production schemes are much improved so that it is now used routinely.3. High frequency wave (2.45GHz, 5 kW) is coupled to plasma through the vacuum window. The discharge duration becomes longer.Induction coil experiments in TST-M :Induction coils of 3 turns have been set inside TST-M vacuum vessel. The purposes are 1) Preionization by induction coils so that volt second from OH coils are used effectively for the plasma heating.2) The diverted plasma is formed by induction coils.The plasma current increases from 40 kA to 55 kA and discharge duration increases to 6 ms. It is confirmed that he plasma is produced around the induction coils from visible light diagnostics.Thus it is confirmed that induction coil operation is useful in spherical tokamak.