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Title: Optical shaping of gas targets for laser–plasma ion sources

In this paper, we report on the experimental demonstration of a technique to generate steep density gradients in gas-jet targets of interest to laser–plasma ion acceleration. By using an intentional low-energy prepulse, we generated a hydrodynamic blast wave in the gas to shape the target prior to the arrival of an intense CO$$_{2}$$($${\it\lambda}\approx 10~{\rm\mu}\text{m}$$) drive pulse. This technique has been recently shown to facilitate the generation of ion beams by shockwave acceleration (Trescaet al.,Phys. Rev. Lett., vol. 115 (9), 2015, 094802). Here, we discuss and introduce a model to understand the generation of these blast waves and discuss in depth the experimental realisation of the technique, supported by hydrodynamics simulations. With appropriate prepulse energy and timing, this blast wave can generate steepened density gradients as short as$$l\approx 20~{\rm\mu}\text{m}$$($1/e$), opening up new possibilities for laser–plasma studies with near-critical gaseous targets.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [2] ;  [3] ;  [2] ;  [3] ;  [1]
  1. Imperial College, London (United Kingdom). The John Adams Institute for Accelerator Science, Blackett Laboratory
  2. Stony Brook Univ., NY (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Accelerator Test Facility
Publication Date:
Report Number(s):
BNL-112473-2016-JA
Journal ID: ISSN 0022-3778; R&D Project: KB0202011
Grant/Contract Number:
SC00112704; FG02-07ER41488
Type:
Accepted Manuscript
Journal Name:
Journal of Plasma Physics
Additional Journal Information:
Journal Volume: 82; Journal Issue: 1; Journal ID: ISSN 0022-3778
Publisher:
Cambridge University Press
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS
OSTI Identifier:
1336081

Dover, N. P., Cook, N., Tresca, O., Ettlinger, O., Maharjan, C., Polyanskiy, M. N., Shkolnikov, P., Pogorelsky, I., and Najmudin, Z.. Optical shaping of gas targets for laser–plasma ion sources. United States: N. p., Web. doi:10.1017/S002237781600012X.
Dover, N. P., Cook, N., Tresca, O., Ettlinger, O., Maharjan, C., Polyanskiy, M. N., Shkolnikov, P., Pogorelsky, I., & Najmudin, Z.. Optical shaping of gas targets for laser–plasma ion sources. United States. doi:10.1017/S002237781600012X.
Dover, N. P., Cook, N., Tresca, O., Ettlinger, O., Maharjan, C., Polyanskiy, M. N., Shkolnikov, P., Pogorelsky, I., and Najmudin, Z.. 2016. "Optical shaping of gas targets for laser–plasma ion sources". United States. doi:10.1017/S002237781600012X. https://www.osti.gov/servlets/purl/1336081.
@article{osti_1336081,
title = {Optical shaping of gas targets for laser–plasma ion sources},
author = {Dover, N. P. and Cook, N. and Tresca, O. and Ettlinger, O. and Maharjan, C. and Polyanskiy, M. N. and Shkolnikov, P. and Pogorelsky, I. and Najmudin, Z.},
abstractNote = {In this paper, we report on the experimental demonstration of a technique to generate steep density gradients in gas-jet targets of interest to laser–plasma ion acceleration. By using an intentional low-energy prepulse, we generated a hydrodynamic blast wave in the gas to shape the target prior to the arrival of an intense CO$_{2}$(${\it\lambda}\approx 10~{\rm\mu}\text{m}$) drive pulse. This technique has been recently shown to facilitate the generation of ion beams by shockwave acceleration (Trescaet al.,Phys. Rev. Lett., vol. 115 (9), 2015, 094802). Here, we discuss and introduce a model to understand the generation of these blast waves and discuss in depth the experimental realisation of the technique, supported by hydrodynamics simulations. With appropriate prepulse energy and timing, this blast wave can generate steepened density gradients as short as$l\approx 20~{\rm\mu}\text{m}$($1/e$), opening up new possibilities for laser–plasma studies with near-critical gaseous targets.},
doi = {10.1017/S002237781600012X},
journal = {Journal of Plasma Physics},
number = 1,
volume = 82,
place = {United States},
year = {2016},
month = {2}
}