Self-focusing of UV radiation in 1 mm scale plasma in a deep ablative crater produced by 100 ns, 1 GW KrF laser pulse in the context of ICF

Zvorykin V. D.; Lebo I. G.; Shutov A. V.; Ustinovskii N. N.

doi:10.1063/1.5142361

Volume 5 Issue 3

May 2020

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Article Navigation > Matter and Radiation at Extremes > 2020 > 5(3): 035401

Zvorykin V. D., Lebo I. G., Shutov A. V., Ustinovskii N. N.. Self-focusing of UV radiation in 1 mm scale plasma in a deep ablative crater produced by 100 ns, 1 GW KrF laser pulse in the context of ICF[J]. Matter and Radiation at Extremes, 2020, 5(3): 035401. doi: 10.1063/1.5142361

Citation:

Zvorykin V. D., Lebo I. G., Shutov A. V., Ustinovskii N. N.. Self-focusing of UV radiation in 1 mm scale plasma in a deep ablative crater produced by 100 ns, 1 GW KrF laser pulse in the context of ICF[J]. Matter and Radiation at Extremes, 2020, 5(3): 035401. doi: 10.1063/1.5142361

Citation:

Zvorykin V. D., Lebo I. G., Shutov A. V., Ustinovskii N. N.. Self-focusing of UV radiation in 1 mm scale plasma in a deep ablative crater produced by 100 ns, 1 GW KrF laser pulse in the context of ICF[J]. Matter and Radiation at Extremes, 2020, 5(3): 035401. doi: 10.1063/1.5142361

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Self-focusing of UV radiation in 1 mm scale plasma in a deep ablative crater produced by 100 ns, 1 GW KrF laser pulse in the context of ICF

doi: 10.1063/1.5142361

1.
Lebedev Physical Institute of RAS, 53 Leninskiy Pr., Moscow 119991, Russian Federation
2.
MIREA—Russian Technological University, Institute of Cybernetics, 78 Vernadskogo Pr., Moscow 119454, Russian Federation

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Corresponding author: a)Author to whom correspondence should be addressed: zvorykin@sci.lebedev.ru
Received Date: 2019-12-13
Accepted Date: 2020-03-20

Available Online: 2020-05-01

Publish Date: 2020-05-15

Abstract

Abstract

Experiments at the GARPUN KrF laser facility and 2D simulations using the NUTCY code were performed to study the irradiation of metal and polymethyl methacrylate (PMMA) targets by 100 ns UV pulses at intensities up to 5 × 10¹² W cm⁻². In both targets, a deep crater of length 1 mm was produced owing to the 2D geometry of the supersonic propagation of the ablation front in condensed matter that was pushed sideways by a conical shock wave. Small-scale filamentation of the laser beam caused by thermal self-focusing of radiation in the crater-confined plasma was evidenced by the presence of a microcrater relief on the bottom of the main crater. In translucent PMMA, with a penetration depth for UV light of several hundred micrometers, a long narrow channel of length 1 mm and diameter 30 μm was observed emerging from the crater vertex. Similar channels with a length-to-diameter aspect ratio of ∼1000 were produced by a repeated-pulse KrF laser in PMMA and fused silica glass at an intensity of ∼10⁹ W cm⁻². This channel formation is attributed to the effects of radiation self-focusing in the plasma and Kerr self-focusing in a partially transparent target material after shallow-angle reflection by the crater wall. Experimental modeling of the initial stage of inertial confinement fusion-scale direct-drive KrF laser interaction with subcritical coronal plasmas from spherical and cone-type targets using crater-confined plasmas seems to be feasible with increased laser intensity above 10¹⁴ W cm⁻².

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References(56)

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