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Proceedings Paper

Observation of monoenergetic protons from a near-critical gas target tailored by a hydrodynamic shock
Author(s): Y.-H. Chen; M. H. Helle; A. Ting; D. F. Gordon; M. N. Polyanskiy; I. Pogorelsky; M. Babzien; Z. Najmudin
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Paper Abstract

We present our recent experimental results of monoenergetic protons accelerated from the interaction of an intense terawatt CO2 laser pulse with a near-critical hydrogen gas target, with its density profile tailored by a hydrodynamic shock. A 5-ns Nd:YAG laser pulse is focused onto a piece of stainless steel foil mounted at the front edge of the gas jet nozzle orifice. The ablation launches a spherical shock into the near-critical gas column, which creates a sharp density gradient at the front edge of the target, with ~ 6X local density enhancement up to several times of critical density within ~<100 microns. With such density profile, we have obtained monoenergetic proton beams with good shot-to-shot reproducibility and energies up to 1.2 MeV.

Paper Details

Date Published: 14 May 2015
PDF: 6 pages
Proc. SPIE 9514, Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III, 95140C (14 May 2015); doi: 10.1117/12.2182094
Show Author Affiliations
Y.-H. Chen, Research Support Instruments, Inc. (United States)
Naval Research Lab. (United States)
M. H. Helle, Naval Research Lab. (United States)
A. Ting, Naval Research Lab. (United States)
D. F. Gordon, Naval Research Lab. (United States)
M. N. Polyanskiy, Brookhaven National Lab. (United States)
I. Pogorelsky, Brookhaven National Lab. (United States)
M. Babzien, Brookhaven National Lab. (United States)
Z. Najmudin, Imperial College London (United Kingdom)


Published in SPIE Proceedings Vol. 9514:
Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III
Kenneth W. D. Ledingham; Eric Esarey; Carl B. Schroeder; Klaus Spohr; Paul McKenna; Florian J. Grüner; Paul R. Bolton, Editor(s)

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