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Title: 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 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 × 10{sup 6 }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.
Authors:
; ; ; ; ; ;  [1] ; ; ; ; ; ; ;  [2] ;  [3]
  1. Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)
  2. Institute of Nuclear Physics and Chemistry, CAEP, Mianyang 621900 (China)
  3. Research Center of Laser Fusion, CAEP, Mianyang 621900 (China)
Publication Date:
OSTI Identifier:
22408042
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPRESSION; CONVERGENCE; CYLINDRICAL CONFIGURATION; ENERGY DENSITY; IMAGES; IMPLOSIONS; KINETIC ENERGY; PLASMA INSTABILITY; SPHERICAL CONFIGURATION; SYMMETRY; TARGETS; WIRES; X RADIATION