Research on early stages of wire array Z-pinch

Shi Huantong; Zou Xiaobing; Zhu Xinlen; Zhao Shen; Wang Xinxin

doi:10.11884/HPLPB201830.170320

Volume 30 Issue 8

Aug. 2018

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Shi Huantong, Zou Xiaobing, Zhu Xinlen, et al. Research on early stages of wire array Z-pinch[J]. High Power Laser and Particle Beams, 2018, 30: 085001. doi: 10.11884/HPLPB201830.170320

Citation:

Shi Huantong, Zou Xiaobing, Zhu Xinlen, et al. Research on early stages of wire array Z-pinch[J]. High Power Laser and Particle Beams, 2018, 30: 085001. doi: 10.11884/HPLPB201830.170320

Shi Huantong, Zou Xiaobing, Zhu Xinlen, et al. Research on early stages of wire array Z-pinch[J]. High Power Laser and Particle Beams, 2018, 30: 085001. doi: 10.11884/HPLPB201830.170320

Citation:

Shi Huantong, Zou Xiaobing, Zhu Xinlen, et al. Research on early stages of wire array Z-pinch[J]. High Power Laser and Particle Beams, 2018, 30: 085001. doi: 10.11884/HPLPB201830.170320

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Research on early stages of wire array Z-pinch

doi: 10.11884/HPLPB201830.170320

Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

Received Date: 2017-12-24
Rev Recd Date: 2018-04-13
Publish Date: 2018-08-15

Abstract

Abstract

Electrical explosion of wire (EEW) is the first stage of wire array Z-pinch, which has great influence on the following dynamics and the final X-ray emission.In this paper, the physical processes of two-wire Z-pinch was observed by X-ray backlighting.The sub-nanosecond, micrometer-scale X-ray source was generated with X-pinches connected in series with the Zpinch.Experimental results show that electrically exploded wires in vacuum usually develop into "core-corona"structure (highdensity core surrounded by low-density corona plasma).The corona plasma is then driven to the axis by global magnetic field to form a precursor plasma column, adding to the instabilities of the implosion stage.Therefore single wire EEW experiments were carried out to increase the energy deposition of wire core so as to suppress the formation of"core-corona"structure.Experimental results show that the performance of EEW can be improved by higher rising-rate of driving current and positive radial electric field along wire surface.In order to combine the two favorable methods, a flashover switch was inserted between wire-end and cathode.As a result, the specific energy of EEW was increased by 2 times (5.7 eV/atomvs 13 eV/atom) and 3.5 times (3.4 eV/atomvs12 eV/atom) under positive and negative driving current, exceeding the atomization enthalpy of tungsten (8.8 eV/atom) by a factor of 1.4.The laser interferograms show no high-density wire core; in other words, fully vaporized (core-free) wire explosion of bare tungsten wire was achieved.
- Z-pinch,
- electrical wire explosion,
- core-corona structure,
- mass ablation,
- flashover switch,
- core-free wire explosion

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References(16)

References

[1]	Haines M G, Lebedev S V, Chittenden J P, et al. The past, present, and future of Z pinches[J]. Phys Plasmas, 2000, 7(52): 1672-1680.
[2]	Ryutov D D, Derzon M S, Matzen M K. The physics of fast Z pinches[J]. Rev Mod Phys, 2000, 72(1): 167-223.
[3]	Deeney C, Douglas M R, Spielman R B, et al. Enhancement of X-ray Power from a Z Pinch Using Nested-Wire Arrays[J]. Phys Rev Lett, 1998, 81(22): 4883-4886. doi: 10.1103/PhysRevLett.81.4883
[4]	Spielman R B, Deeney C, Chandler G A, et al. Tungsten wire-array Z-pinch experiments at 200 TW and 2 MJ[J]. Phys Plasmas, 1998, 5(5): 2105-2111. doi: 10.1063/1.872881
[5]	Lebedev S V, Beg F N, Bland S N, et al. Snowplow-like behavior in the implosion phase of wire array Z pinches[J]. Phys Plasmas, 2002, 9(52): 2293-2301.
[6]	Lebedev S V, Beg F N, Bland S N, et al. Effect of discrete wires on the implosion dynamics of wire array Z pinches[J]. Phys Plasmas, 2001, 8(8): 3734-3747. doi: 10.1063/1.1385373
[7]	Zhu X, Zou X, Zhang R, et al. X-ray backlighting of the initial stage of single-wire and multi-wire Z-Pinch[C]//Proc of IPMHVC. 2012: 574-577.
[8]	赵屾, 朱鑫磊, 石桓通, 等. 用X-pinch对双丝Z箍缩进行轴向X射线背光照相[J]. 物理学报, 2015, 64(1): 201-206. https://www.cnki.com.cn/Article/CJFDTOTAL-WLXB201501026.htm Zhao Shen, Zhu Xinlei, Shi Huantong, et al, Axial backlighting of two-wire Z-pinch using an X-pinch as an X-ray source. Acta Physica Sinica, 2015, 64(1): 201-206 https://www.cnki.com.cn/Article/CJFDTOTAL-WLXB201501026.htm
[9]	Shi H, Zou X, Wang X. Effect of high-voltage electrode geometry on energy deposition into exploding wire in vacuum[J]. IEEE Trans Dielectr Electr Insul, 2017, 24(4): 2001-2005.
[10]	Shi H, Zou X, Wang X. Fully vaporized electrical explosion of bare tungsten wire in vacuum[J]. Appl Phys Lett, 2016, 109(13): 5063-929.
[11]	Sarkisov G S, Rosenthal S E, Cochrane K R, et al. Nanosecond electrical explosion of thin aluminum wires in a vacuum: Experimental and computational investigations[J]. Phys Rev E, 2005, 71: 046404.
[12]	Sarkisov G S, Struve K W, Mcdaniel D H. Effect of current rate on energy deposition into exploding metal wires in vacuum[J]. Phys Plasmas, 2004, 11(10): 4573-4581.
[13]	Tucker T J, Toth R P. A computer code for the prediction of the behavior of electrical circuits containing exploding wire elements[R]. Sand-75-0041 Unlimited distribution, 1975.
[14]	Sarkisov G S, Struve K W, Mcdaniel D H. Effect of deposited energy on the structure of an exploding tungsten wire core in a vacuum[J]. Phys Plasmas, 2005, 12: 052702.
[15]	Lebedev S V, Savvatimskii A I. Metals during rapid heating by dense currents[J]. Sov Phys-Uspekh, 1984, 27(10): 749-771.
[16]	Lebedev S V. Electrical explosion study of certain thermophysical properties of tungsten and molybdenum near the melting point[J]. High Temp, 1971, 9(5): 845-849.