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)
a Department of Engineering Physics, Tsinghua University, Beijing 100084, China; b Institute of Nuclear Physics and Chemistry, Mianyang 621900, China
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.
Received: 16 November 2005
Revised: 18 May 2006
Accepted manuscript online:
Fund: Project supported by the
National Natural Science Foundation of China (Grant No 10035030).
Cite this article:
Zhang Fa-Qiang(章法强), Li Zheng-Hong(李正宏), Xu Ze-Ping(许泽平), Xu Rong-Kun(徐荣昆), Yang Jian-Lun(杨建伦), Guo Cun(郭存), Xia Guang-Xin(夏广新), Chen Jin-Chuan(陈进川), Song Feng-Jun(宋凤军), Ning Jia-Min(宁家敏), Wang Zhen(王真), Xue Fei-Biao(薛飞彪), Li Lin-Bo(李林波), Qin Yi(秦义), Ying Chun-Tong(应纯同), and Liu Guang-Jun(刘广均) X-ray observations of tungsten wire array Z-pinch implosions on QiangGuang-1 facility 2006 Chinese Physics 15 2058
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