A real-time interlock system for power injection in electron cyclotron resonance heating (ECRH) was developed to be applied to Large Helical Device (LHD) plasma. This system enabled perpendicular injection, thus improving the performance of ECRH more than has ever been achieved before in LHD. Perpendicular propagation of the electron cyclotron wave at 77GHz became more insensitive to the effect of refraction in comparison to the conventional oblique propagation. The achieved central electron temperature in the case of perpendicular injection was approximately 2 keV higher than that in the case of standard oblique injection for a central electron density of 1 10¹⁹m⁻³ by 1 MW injection. With such improved performance of ECRH, high-density ECRH plasma of 8 10¹⁹m⁻³ was successfully sustained after the injection of multiple hydrogen ice pellets for the first time in LHD.

开发了一种用于电子回旋共振加热（ECRH）中的功率注入的实时互锁系统，该系统将应用于大型螺旋装置（LHD）等离子体。该系统实现了垂直注入，因此比LHD以前获得的ECRH性能有了更大的提高。与传统的倾斜传播相比，电子回旋波在77GHz处的垂直传播对折射的影响变得更加不敏感。对于通过1MW注入的中心电子密度为1 10 ¹⁹ m ^-3的情况，垂直注入的情况下达到的中心电子温度比标准倾斜注入的情况下达到的中心电子温度高约2keV 。凭借ECRH的这种改进性能，高密度ECRH等离子体达到8 10 ¹⁹ m在LHD中首次注入多个氢冰粒后，成功维持了^-3。