【摘要】 通过在HT 7装置的内真空室安装一对同心圆逆磁线圈 ,并运用软件补偿的方法 ,对HT 7装置的逆磁通量进行了测量。在杂散场测量与软件补偿实验中 ,发现同心圆逆磁线圈感应的杂散信号主要来自垂直场、涡流电流、等离子体电流和纵场电流的变化。逆磁测量结果表明 ,在等离子体线平均密度 ne 很低时 ( ne <2 .2 ×10 1 3cm- 3) ,HT 7等离子体的总体能量约束时间τE 随 ne 线性变化 ;在 ne 很高时 ( ne >2 .2 × 10 1 3cm- 3) ,τE 则趋于饱和 ,其饱和值约为 2 1ms。并运用计算机统计分析的方法给出了欧姆加热的τE 定标律为τE =1.5 7 ne0 .72±0 .0 4 ×Ip0 .35± 0 .0 2 B0 .31 ± 0 .0 3T 。更多还原

【Abstract】 A pair of concentric loops is mounted in a poloidal plane inside the internal vacuum vessel in order to measure diamagnetism in the HT 7 superconducting tokamak and a method of software compensation has been applied.In the experiments of measurement and software compensation of diamagnetism,it is found that stray fields mainly come from the vertical field,plasma current and eddy current.Results of diamagnetism in the HT 7 indicate that total energy confinement time changes linearly in the condition of low central line averaged electron density  e ( e<2.2×10 13 cm -3 ),hecomes saturated at high  e ( e>2.2×10 13 cm -3 ) and the saturation point is 21ms.The scaling law of τ E  in the HT 7 ohmic heating plasma is provided by statistical analysis in computer,τ E =1.57 0.72±0.04 e I 0.35±0.02 p B 0.31±0.03 T ?更多还原