High-contrast laser acceleration of relativistic electrons in solid cone-wire targets

Higginson, D. P.; Link, A.; Sawada, H.; Wilks, S. C.; Chawla, S. R.; Chen, C. D.; Jarrott, L. C.; Flippo, K. A.; McLean, H. S.; Patel, P. K.; Perez, F.; Beg, F. N.; Bartal, T.; Wei, M. S.

doi:10.1103/PhysRevE.92.063112

Title: High-contrast laser acceleration of relativistic electrons in solid cone-wire targets

Journal Article · Thu Dec 31 00:00:00 EST 2015 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

DOI:https://doi.org/10.1103/PhysRevE.92.063112· OSTI ID:1245704

Higginson, D. P. ^[1]; Link, A. ^[2]; Sawada, H. ^[3]; Wilks, S. C. ^[2]; Chawla, S. R. ^[1]; Chen, C. D. ^[2]; Jarrott, L. C. ^[3]; Flippo, K. A. ^[4]; McLean, H. S. ^[2]; Patel, P. K. ^[2]; Perez, F. ^[2]; Beg, F. N. ^[3]; Bartal, T. ^[1]; Wei, M. S. ^[5]

Univ. of California-San Diego, La Jolla, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California-San Diego, La Jolla, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
General Atomics, San Diego, CA (United States)

Optimization of electron coupling into small solid angles is of extreme importance to applications, such as Fast Ignition, that require maximum electron energy deposition within a small volume. To optimize this coupling, we use the ultra-high-contrast Trident laser, which remains below intensity of 10¹¹ W/cm² until < 0.1 ns before the main pulse, while still attaining high-energy, 75 J, and peak intensity of 5 x 10¹⁹ W/cm². Using a cone-wire target, we find that the coupling into the 40 μm diameter wire is increased by a factor of 2.7x over the low-contrast Titan laser at similar peak intensity. Full-scale simulations are used to model the laser interaction and quantitatively reproduce the experimental results. These show that increase in coupling is due to both a closer interaction, as well as the reduction of laser filamentation and self-focusing.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC52-07NA27344

OSTI ID:: 1245704

Report Number(s):: LLNL-JRNL-603594

Journal Information:: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, Vol. 92, Issue 6; ISSN 1539-3755

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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