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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]
+ Show Author Affiliations
  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.
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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. https://doi.org/10.1088/1361-6587/aaa556
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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. https://doi.org/10.1088/1361-6587/aaa556. https://www.osti.gov/servlets/purl/1423136.
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@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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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1361-6587/aaa556
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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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journal, November 2012

Laser ion acceleration using a solid target coupled with a low-density layer
journal, March 2012

Formation and Structure of Electrostatic Collisionless Shocks
journal, December 1970

Study on Coulomb explosions of ion mixtures
journal, February 2016

  • Boella, E.; Peiretti Paradisi, B.; D’Angola, A.
  • Journal of Plasma Physics, Vol. 82, Issue 1
  • DOI: 10.1017/S0022377816000179

Relativistic generalization of formation and ion-reflection conditions in electrostatic shocks
journal, April 2013

Solitary versus shock wave acceleration in laser-plasma interactions
journal, April 2012

  • Macchi, Andrea; Nindrayog, Amritpal Singh; Pegoraro, Francesco
  • Physical Review E, Vol. 85, Issue 4
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Propagation of relativistically intense laser pulses in nonuniform plasmas
journal, October 1998

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text, January 2012

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Ion acceleration by superintense laser-plasma interaction
text, January 2013

Study on Coulomb explosions of ion mixtures
text, January 2015

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    All-optical cascaded ion acceleration in segmented tubes driven by multiple independent laser pulses
    journal, September 2019

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