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Title: Ion acceleration in electrostatic collisionless shock: on the optimal density profile for quasi-monoenergetic beams

Abstract

Here, a numerical study on ion acceleration in electrostatic shock waves is presented, with the aim of determining the best plasma configuration to achieve quasi-monoenergetic ion beams in laser-driven systems. It was recently shown that tailored near-critical density plasmas characterized by a long-scale decreasing rear density profile lead to beams with low energy spread (Fiúza et al 2012 Phys. Rev. Lett. 109 215001). In this work, a detailed parameter scan investigating different plasma scale lengths is carried out. As result, the optimal plasma spatial scale length that allows for minimizing the energy spread while ensuring a significant reflection of ions by the shock is identified. Furthermore, a new configuration where the required profile has been obtained by coupling micro layers of different densities is proposed. Lastly, results show that this new engineered approach is a valid alternative, guaranteeing a low energy spread with a higher level of controllability.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [1]
  1. Univ. de Lisboa, Lisbon (Portugal). Inst. of Superior Tecnico (IST)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Ruhr Univ., Bochum (Germany). Inst. fur Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik
  4. Univ. Inst. of Lisbon (ISCTE -IUL), Lisbon (Portugal). Dept. of Information Science and Technology (DCTI)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE; European Research Council (ERC)
OSTI Identifier:
1423136
Grant/Contract Number:  
AC02-76SF00515; 267841; 695008
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 3; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Collisionless shock wave acceleration; electrostatic shocks; laser-driven shock acceleration; compact accelerators; PIC simulations

Citation Formats

Boella, E., Fiúza, F., Novo, A. Stockem, Fonseca, R., and Silva, L. O. Ion acceleration in electrostatic collisionless shock: on the optimal density profile for quasi-monoenergetic beams. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aaa556.
Boella, E., Fiúza, F., Novo, A. Stockem, Fonseca, R., & Silva, L. O. Ion acceleration in electrostatic collisionless shock: on the optimal density profile for quasi-monoenergetic beams. United States. doi:10.1088/1361-6587/aaa556.
Boella, E., Fiúza, F., Novo, A. Stockem, Fonseca, R., and Silva, L. O. Thu . "Ion acceleration in electrostatic collisionless shock: on the optimal density profile for quasi-monoenergetic beams". United States. doi:10.1088/1361-6587/aaa556. https://www.osti.gov/servlets/purl/1423136.
@article{osti_1423136,
title = {Ion acceleration in electrostatic collisionless shock: on the optimal density profile for quasi-monoenergetic beams},
author = {Boella, E. and Fiúza, F. and Novo, A. Stockem and Fonseca, R. and Silva, L. O.},
abstractNote = {Here, a numerical study on ion acceleration in electrostatic shock waves is presented, with the aim of determining the best plasma configuration to achieve quasi-monoenergetic ion beams in laser-driven systems. It was recently shown that tailored near-critical density plasmas characterized by a long-scale decreasing rear density profile lead to beams with low energy spread (Fiúza et al 2012 Phys. Rev. Lett. 109 215001). In this work, a detailed parameter scan investigating different plasma scale lengths is carried out. As result, the optimal plasma spatial scale length that allows for minimizing the energy spread while ensuring a significant reflection of ions by the shock is identified. Furthermore, a new configuration where the required profile has been obtained by coupling micro layers of different densities is proposed. Lastly, results show that this new engineered approach is a valid alternative, guaranteeing a low energy spread with a higher level of controllability.},
doi = {10.1088/1361-6587/aaa556},
journal = {Plasma Physics and Controlled Fusion},
number = 3,
volume = 60,
place = {United States},
year = {2018},
month = {2}
}

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Cited by: 2 works
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Figures / Tables:

Figure 1 Figure 1: Upstream ion energy spread (a) and percentage of reflected upstream ions (b) versus Lg at t = 3308 (black), 4734 (red) and 6688 (blue) ω $−1\atop{pe,1}$, where ωpe,1 = $\sqrt{4πe^{2}n_{1}/m_{e}}$ is the electron frequency of the plasma P1. Plasma slabs with n1 = 1019 cm−3, L1 = 100more » μm, Γ = 10, L$opt\atop{g}$ = 200 μm, initial electron temperature Te = 0.08MeV and initial density profile as shown in the inset in (a) have been considered. The parameter scan has been performed with the shell algorithm.« less

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