Realization of quasi-spherical implosion using pre-shaped prolate wire arrays with a compression foam target inside

Quasi-spherical (QS) implosion of wire arrays and its impact on the foam target have been studied on the 100 ns 1.5 MA Qiangguang-I facility, which suggests that a high quality impact between the QS implosion and foam target can be achieved by adjusting load's initial shape carefully to match t...

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Veröffentlicht in:Physics of plasmas 2015-02, Vol.22 (2)
Hauptverfasser: Zhang, Yang, Ding, Ning, Li, Zhenghong, Xu, Rongkun, Chen, Dingyang, Ye, Fan, Zhou, Xiuwen, Chen, Faxin, Chen, Jinchuan, Li, Linbo, Xiao, Delong, Sun, Shunkai, Xue, Chuang, Shu, Xiaojian, Wang, Jianguo
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Sprache:eng
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Zusammenfassung:Quasi-spherical (QS) implosion of wire arrays and its impact on the foam target have been studied on the 100 ns 1.5 MA Qiangguang-I facility, which suggests that a high quality impact between the QS implosion and foam target can be achieved by adjusting load's initial shape carefully to match the external magnetic pressure. Implosions of loads with H/d ∼ 1.2 were studied with a self-emission x-ray pinhole image system and a dark field schlieren system. The radially developed spike-like instabilities indicate the spherical convergence of plasma. The observed radiation on the foam target surface suggests satisfying implosion symmetry and wire-foam impact simultaneity. An average implosion speed of 10.5 × 106 cm/s was obtained with an optical streak image system. The derived peak kinetic energy density ∼2.1 kJ/cm is remarkably higher than cylindrical cases, which agree with the expectations.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4905229