HL-1托卡马克中的氢再循环

HYDROGEN RECYCLING IN HL-1 TOKAMAK

本文从粒子平衡方程出发,运用Howe的氢再循环模型,借助于设置在不同位置并经绝对校准的H_α探测器测得的信号强度等实验数据,研究了HL-1托卡马克放电中总体再循环系数随时间变化,并采用Ehrenberg定义的加料效率的概念来分析在不同壁和孔栏条件或各种工作气体情况下的壁抽吸和壁加料现象,用四极质谱仪观察并比较了不同等离子体放电后的粒子释放情况,较系统地研究了HL-1装置不同运行条件下的再循环现象及其对粒子约束特性的影响。

The recycling behaviours and their effects on the particle confinement under various operational conditions in HL-1 device are studied systematically. Using the particle balance equation and a hydrogen recycling model proposed by Howe, we estimated the global recycling coefficient R(t) from the data of Ha emission and others. The fueling ratio introduced by Ehrenberg is adopted to analyse the wall pumping and the wall fuelling as the wall/limiter condition or the kinds of inlet gas are altered. The phenomena of particle release after different plasma discharges are also observed and compared by using the quadrupole mass-spectrometer.