中国物理B ›› 2006, Vol. 15 ›› Issue (9): 2058-2064.doi: 10.1088/1009-1963/15/9/028

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X-ray observations of tungsten wire array Z-pinch implosions on QiangGuang-1 facility

应纯同1, 刘广均1, 章法强2, 李正宏3, 许泽平3, 徐荣昆3, 杨建伦3, 郭存3, 夏广新3, 陈进川3, 宋凤军3, 宁家敏3, 王真3, 薛飞彪3, 李林波3, 秦义3   

  1. (1)Department of Engineering Physics, Tsinghua University,Beijing 100084, China; (2)Department of Engineering Physics, Tsinghua University,Beijing 100084, China;Institute of Nuclear Physics and Chemistry,Mianyang 621900, China; (3)Institute of Nuclear Physics and Chemistry,Mianyang 621900, China
  • 收稿日期:2005-11-16 修回日期:2006-05-18 出版日期:2006-09-20 发布日期:2006-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10035030).

X-ray observations of tungsten wire array Z-pinch implosions on QiangGuang-1 facility

Zhang Fa-Qiang(章法强)a)b)†, Li Zheng-Hong(李正宏)b), Xu Ze-Ping(许泽平)b), Xu Rong-Kun(徐荣昆)b), Yang Jian-Lun(杨建伦)b), Guo Cun(郭存)b), Xia Guang-Xin(夏广新)b), Chen Jin-Chuan(陈进川)b), Song Feng-Jun(宋凤军)b), Ning Jia-Min(宁家敏)b), Wang Zhen(王真)b), Xue Fei-Biao(薛飞彪)b), Li Lin-Bo(李林波)b), Qin Yi(秦义)b), Ying Chun-Tong(应纯同)a), and Liu Guang-Jun(刘广均)a)   

  1. a Department of Engineering Physics, Tsinghua University, Beijing 100084, China; b Institute of Nuclear Physics and Chemistry, Mianyang 621900, China
  • Received:2005-11-16 Revised:2006-05-18 Online:2006-09-20 Published:2006-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10035030).

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摘要： Z-pinch experiments with two arrays consisting, respectively, of 32 4-μm- and 6-μm-diameter tungsten wires have been carried out on QiangGuang-1 facility with a current rising up to 1.5MA in 80ns. At early time of implosion, x-ray framing images show that the initial emission comes from the central part of arrays, and double clear emission rings, drifting to the anode and the cathode at 5×106cm/s and 2.4×107cm/s respectively, are often produced near the electrodes. Later, in a 4-μm-diameter tungsten wire array, filamentation caused by ohmic heating is prominent, and more than ten filaments have been observed. A radial inward shift of arrays starts at about 30\,ns earlier than the occurrence of the x-ray peak power for both kinds of arrays, and the shrinkage rate of emission region is as high as 1.7×107cm/s in a 4-μm-diameter tungsten wire array, which is two times higher than that in a 6-μm one. Emission from precursor plasmas is observed in implosion of 6-μm-diameter tungsten wire arrays, but not in implosion of a 4-μm-diameter tungsten wire array. Whereas, in a 4-μm-diameter tungsten wire array, the soft x-ray emission shows the growth of m=1 instability in the plasma column, which is caused by current. The reasons for the discrepancy between implosions of 4-μm- and 6-μm-diameter tungsten wire arrays are explained.

关键词: Z-pinch, x-ray, wire array, R-T instability

Abstract: Z-pinch experiments with two arrays consisting, respectively, of 32 4-μm- and 6-μm-diameter tungsten wires have been carried out on QiangGuang-1 facility with a current rising up to 1.5MA in 80ns. At early time of implosion, x-ray framing images show that the initial emission comes from the central part of arrays, and double clear emission rings, drifting to the anode and the cathode at 5×106cm/s and 2.4×107cm/s respectively, are often produced near the electrodes. Later, in a 4-μm-diameter tungsten wire array, filamentation caused by ohmic heating is prominent, and more than ten filaments have been observed. A radial inward shift of arrays starts at about 30\,ns earlier than the occurrence of the x-ray peak power for both kinds of arrays, and the shrinkage rate of emission region is as high as 1.7×107cm/s in a 4-μm-diameter tungsten wire array, which is two times higher than that in a 6-μm one. Emission from precursor plasmas is observed in implosion of 6-μm-diameter tungsten wire arrays, but not in implosion of a 4-μm-diameter tungsten wire array. Whereas, in a 4-μm-diameter tungsten wire array, the soft x-ray emission shows the growth of m=1 instability in the plasma column, which is caused by current. The reasons for the discrepancy between implosions of 4-μm- and 6-μm-diameter tungsten wire arrays are explained.

Key words: Z-pinch, x-ray, wire array, R-T instability

中图分类号:  (Solitons; BGK modes)

  • 52.35.Sb
52.38.-r (Laser-plasma interactions) 52.25.-b (Plasma properties) 52.65.-y (Plasma simulation)