Spectral modification of shock accelerated ions using a hydrodynamically shaped gas target

Tresca, O.; Polyanskiy, M. N.; Dover, N. P.; Cook, N.; Maharjan, C.; Najmudin, Z.; Shkolnikov, P.; Pogorelsky, I.

doi:10.1103/PhysRevLett.115.094802

Title: Spectral modification of shock accelerated ions using a hydrodynamically shaped gas target

Journal Article · Fri Aug 28 00:00:00 EDT 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.115.094802· OSTI ID:1226060

Tresca, O. ^[1]; Polyanskiy, M. N. ^[1]; Dover, N. P. ^[2]; Cook, N. ^[3]; Maharjan, C. ^[3]; Najmudin, Z. ^[2]; Shkolnikov, P. ^[2]; Pogorelsky, I. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Imperial College, London (United Kingdom)
Stony Brook Univ., Stony Brook, NY (United States)

We report on reproducible shock acceleration from irradiation of a λ=10 μm CO2 laser on optically shaped H2 and He gas targets. A low energy laser prepulse (I≲10¹⁴ W cm^–2) is used to drive a blast wave inside the gas target, creating a steepened, variable density gradient. This is followed, after 25 ns, by a high intensity laser pulse (I>10¹⁶ W cm^–2) that produces an electrostatic collisionless shock. Upstream ions are accelerated for a narrow range of prepulse energies. For long density gradients (≳40 μm), broadband beams of He⁺ and H⁺ were routinely produced, whilst for shorter gradients (≲20 μm), quasimonoenergetic acceleration of protons is observed. These measurements indicate that the properties of the accelerating shock and the resultant ion energy distribution, in particular the production of narrow energy spread beams, is highly dependent on the plasma density profile. These findings are corroborated by 2D particle-in-cell simulations.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC00112704; AC02-98CH10886; FG02-07ER41488; AC02-05CH11231; 12-032; mp1401

OSTI ID:: 1226060

Alternate ID(s):: OSTI ID: 1213279

Report Number(s):: BNL-108518-2015-JA; PRLTAO; R&D Project: KBCH139; KB0202011

Journal Information:: Physical Review Letters, Vol. 115, Issue 9; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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Optical shaping of gas targets for laser–plasma ion sources Dover, N. P.; Cook, N.; Tresca, O. Journal of Plasma Physics, Vol. 82, Issue 1 https://doi.org/10.1017/s002237781600012x	journal	February 2016
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Ion acceleration in electrostatic collisionless shock: on the optimal density profile for quasi-monoenergetic beams Boella, E.; Fiúza, F.; Novo, A. Stockem arXiv https://doi.org/10.48550/arxiv.1709.04098	text	January 2017

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