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Title: Excitation of a nonlinear plasma ion wake by intense energy sources with applications to the crunch-in regime

Abstract

We show the excitation of a nonlinear ion-wake mode by plasma electron modes in the bubble regime driven by intense energy sources, using analytical theory and simulations. The ion wake is shown to be a driven nonlinear ion-acoustic wave in the form of a long-lived cylindrical ion soliton which limits the repetition rate of a plasma-based particle accelerator in the bubble regime. We present the application of this evacuated and radially outwards propagating ion-wake channel with an electron skin-depth scale radius for the “crunch-in” regime of hollow-channel plasma. It is shown that the time-asymmetric focusing force phases in the bubble couple to ion motion significantly differently than in the linear electron mode. The electron compression in the back of the bubble sucks in the ions whereas the space charge within the bubble cavity expels them, driving a cylindrical ion-soliton structure at the bubble radius. Once formed, the soliton is sustained and driven radially outwards by the thermal pressure of the wake energy in electrons. Particle-in-cell simulations are used to study the ion-wake soliton structure, its driven propagation and its use for positron acceleration in the crunch-in regime.

Authors:
Publication Date:
Research Org.:
Duke Univ., Durham, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1376270
Alternate Identifier(s):
OSTI ID: 1424014
Grant/Contract Number:  
SC0010012; sc0010012
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 20 Journal Issue: 8; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sahai, Aakash A. Excitation of a nonlinear plasma ion wake by intense energy sources with applications to the crunch-in regime. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.081004.
Sahai, Aakash A. Excitation of a nonlinear plasma ion wake by intense energy sources with applications to the crunch-in regime. United States. doi:10.1103/PhysRevAccelBeams.20.081004.
Sahai, Aakash A. Wed . "Excitation of a nonlinear plasma ion wake by intense energy sources with applications to the crunch-in regime". United States. doi:10.1103/PhysRevAccelBeams.20.081004.
@article{osti_1376270,
title = {Excitation of a nonlinear plasma ion wake by intense energy sources with applications to the crunch-in regime},
author = {Sahai, Aakash A.},
abstractNote = {We show the excitation of a nonlinear ion-wake mode by plasma electron modes in the bubble regime driven by intense energy sources, using analytical theory and simulations. The ion wake is shown to be a driven nonlinear ion-acoustic wave in the form of a long-lived cylindrical ion soliton which limits the repetition rate of a plasma-based particle accelerator in the bubble regime. We present the application of this evacuated and radially outwards propagating ion-wake channel with an electron skin-depth scale radius for the “crunch-in” regime of hollow-channel plasma. It is shown that the time-asymmetric focusing force phases in the bubble couple to ion motion significantly differently than in the linear electron mode. The electron compression in the back of the bubble sucks in the ions whereas the space charge within the bubble cavity expels them, driving a cylindrical ion-soliton structure at the bubble radius. Once formed, the soliton is sustained and driven radially outwards by the thermal pressure of the wake energy in electrons. Particle-in-cell simulations are used to study the ion-wake soliton structure, its driven propagation and its use for positron acceleration in the crunch-in regime.},
doi = {10.1103/PhysRevAccelBeams.20.081004},
journal = {Physical Review Accelerators and Beams},
number = 8,
volume = 20,
place = {United States},
year = {2017},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.20.081004

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Cited by: 2 works
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