Transport of an intense proton beam from a cone-structured target through plastic foam with unique proton source modeling

Bhutwala, K.; McGuffey, C.; Theobald, W.; Deppert, O.; Kim, J.; Nilson, P. M.; Wei, M. S.; Ping, Y.; Foord, M. E.; McLean, H. S.; Patel, P. K.; Higginson, A.; Roth, M.; Beg, F. N.

doi:10.1103/physreve.105.055206

Title: Transport of an intense proton beam from a cone-structured target through plastic foam with unique proton source modeling

Journal Article · Fri May 13 00:00:00 EDT 2022 · Physical Review. E

DOI:https://doi.org/10.1103/physreve.105.055206· OSTI ID:1879266

^[1];

^[2]; Theobald, W. ^[3]; Deppert, O. ^[4]; Kim, J. ^[1]; Nilson, P. M. ^[3]; Wei, M. S. ^[5]; Ping, Y. ^[6]; Foord, M. E. ^[6];

^[6]; Patel, P. K. ^[6]; Higginson, A. ^[1]; Roth, M. ^[4]; Beg, F. N. ^[1]

Univ. of California, San Diego, La Jolla, CA (United States)
Univ. of California, San Diego, La Jolla, CA (United States); General Atomics, San Diego, CA (United States)
Univ. of Rochester, NY (United States)
Technische Univ. Darmstadt (Germany)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Laser-accelerated proton beams are applicable to several research areas within high-energy density science, including warm dense matter generation, proton radiography, and inertial confinement fusion, which all involve transport of the beam through matter. Here, we report on experimental measurements of intense proton beam transport through plastic foam blocks. The intense proton beam was accelerated by the 10 ps, 700 $$\textit{J}$$ OMEGA EP laser irradiating a curved foil target, and focused by an attached hollow cone. The protons then entered the foam block of density 0.38 g/cm³ and thickness 0.55 or 1.00 mm. At the rear of the foam block, a Cu layer revealed the cross section of the intense beam via proton- and hot electron-induced Cu-K_α emission. Images of x-ray emission show a bright spot on the rear Cu film indicative of a forward-directed beam without major breakup. 2D fluid-PIC simulations of the transport were conducted using a unique multi-injection source model incorporating energy-dependent beam divergence. Along with postprocessed calculations of the Cu – $$K_α$$ emission profile, simulations showed that protons retain their ballistic transport through the foam and are able to heat the foam up to several keV in temperature. The total experimental emission profile for the 1.0 mm foam agrees qualitatively with the simulated profile, suggesting that the protons indeed retain their beamlike qualities.

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

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

Grant/Contract Number:: AC52-07NA27344; NA0002034; NA0003876

OSTI ID:: 1879266

Report Number(s):: LLNL-JRNL-838202; 1057815; TRN: US2307624

Journal Information:: Physical Review. E, Vol. 105, Issue 5; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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