喷气式Z箍缩等离子体发射离子束能谱的研究

使用紧凑型汤姆生离子谱仪对喷气式Z箍缩（Z-pinch）等离子体发射的离子束能谱进行了实 验研究.紧凑型汤姆生离子谱仪由入射窗、偏转电磁场、后置针孔及CR-39探测板组成.等离 子体发射的离子束经前置针孔、谱仪入射窗准直后进入偏转电磁场偏转,由后置针孔射出轰 击探测板形成可分辩的抛物线簇.对抛物线簇进行分析处理,得到了等离子体辐射的离子束 能谱及能谱随箍缩状况的变化趋势.关键词：Z箍缩等离子体紧凑型汤姆生谱仪离子束能谱

Energy spectra of ion beams from gas-puff Z-pinch plasma

The energy spectra of ion beams emitted from gas-puff Z-pinch plasma was experim entally studied with a compact Thomson spectrometer, which is composed of an inp ut window, deflecting electromagnetic fields,a rear pinhole, and a CR-39 track d etector. Ion beams were collimated by a front pinhole and the input window of Th omson spectrometer and deflected in the electromagnetic fields, and then they pa ssed through the rear pinhole to hit the CR-39 detector. Based on the detected p ictures of parabolas, we have calculated the energy spectra of ion beams and fou nd that the energy spectra move toward the direction of lower energy for a bad Z -pinch shot. A “bad Z-pinch shot" here means a shallower dip on the di/dt signal, which is the time derivative of Z-pinch current.