Pulsed-power-driven cylindrical aluminium liner implosions with a high aspect ratio at an 8 MA facility,Nuclear Fusion

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Pulsed-power-driven cylindrical aluminium liner implosions with a high aspect ratio at an 8 MA facility
Nuclear Fusion ( IF 3.5 ) Pub Date : 2020-08-11 , DOI: 10.1088/1741-4326/aba0c7
J. Lu , X.S. Yan , S.J. Meng , J.M. Ning , S.Q. Jiang , F.X. Chen , Z.C. Huang , R.H. Yang , F. Ye , R.K. Xu , Z.P. Xu , Z.H. Li

First experimental investigations of foil aluminium liner implosions with a high aspect ratio of ∼ 10 3 at an 8 MA pulsed-power facility in China, motivated by possible application for magneto-inertial fusion, will be reported. Key diagnostics including UV cameras, micro-magnetic probes and x-ray pinhole imaging systems were fielded. Quasi-monochromatic UV images and optical streak data showed localized plasma formation at breakdown positions, suggesting that vacuum gaps in contact play a crucial role in long-time and non-uniform initiation. In liner ablation, quasi-periodic striation patterns were directly observed in UV self-emission images and were found to be azimuthally correlated with Rayleigh–Taylor instabilities. An m ≠ 0 azimuthal helical mode was obtained for the unmagnetized liner, which could be attributed to the large surface roughness that may act as an inherently and randomly seeded instability. Precursor plasma formation was confirmed by the obse...

更新日期：2020-08-12

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