Experimental study of hot electron generation in shock ignition relevant high-intensity regime with large scale hot plasmas

Zhang, S.; Krauland, C. M.; Peebles, J.; Li, J.; Beg, F. N.; Alexander, N.; Theobald, W.; Betti, R.; Haberberger, D.; Campbell, E. M.; Yan, R.; Borwick, E.; Ren, C.; Wei, M. S.

doi:10.1063/1.5119250

Experimental study of hot electron generation in shock ignition relevant high-intensity regime with large scale hot plasmas

Journal Article · Sat Feb 01 00:00:00 EST 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5119250· OSTI ID:1801133

^[1]; Krauland, C. M. ^[2]; ^[3]; Li, J. ^[4]; ^[4]; ^[5]; Theobald, W. ^[6]; Betti, R. ^[6]; Haberberger, D. ^[6]; ^[6]; ^[6]; Borwick, E. ^[6]; Ren, C. ^[6]; ^[5]

Univ. of California, San Diego, CA (United States). Center for Energy Research; University of Rochester
Univ. of California, San Diego, CA (United States). Center for Energy Research; General Atomics, San Diego, CA (United States)
Univ. of California, San Diego, CA (United States). Center for Energy Research; Univ. of Rochester, NY (United States)
Univ. of California, San Diego, CA (United States). Center for Energy Research
General Atomics, San Diego, CA (United States)
Univ. of Rochester, NY (United States)

In the shock ignition (SI) laser fusion scheme, hot electrons generated by the laser spike pulse can either preheat the fuel or strengthen the ignition shock, depending on the hot electron characteristics. We conducted a planar target experiment on the OMEGA-EP laser facility and characterized the temperature and total energy of hot electrons generated from a kilojoule-class 100-ps infrared (IR) or a 1-ns ultraviolet (UV) laser interacting with a large (L_n~330-450 μm) and hot (T_e~1-2 keV) coronal plasma at the SI-relevant intensities (~10¹⁶ W/cm²). The IR laser converts ~2.5% energy into hot electrons with T_hot~ 60–90 keV, while the UV laser couples 0.8% ± 0.7% energy into T_hot=27 ± 9 keV hot electrons. The IR-produced hot electrons yield five times higher Cu Kα emission than the UV case, confirming the higher electron conversion efficiency with the IR laser. The low energy conversion from the UV laser to hot electrons may be due to the refraction of the off-normal incident laser in the large coronal plasma. These findings are the first comparisons of hot electron generation between the IR and UV pulses at kilojoule scales in SI-relevant large-scale plasmas. The findings may expand the SI design space to include IR lasers as the possible spike lasers.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002730; NA0003600; SC0014666

OSTI ID:: 1801133

Alternate ID(s):: OSTI ID: 1600582

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 27; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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