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Ion dynamics driven by a strongly nonlinear plasma wake

Journal Article · · Plasma Physics and Controlled Fusion

Abstract In plasma wakefield accelerators, the wave excited in the plasma eventually breaks and leaves behind slowly changing fields and currents that perturb the ion density background. We study this process numerically using the example of a Facility for Advanced aCcelerator Experimental Tests (FACET) experiment where the wave is excited by an electron bunch in the bubble regime in a radially bounded plasma. Four physical effects underlie the dynamics of ions: (1) attraction of ions toward the axis by the fields of the driver and the wave, resulting in formation of a density peak, (2) generation of ion-acoustic solitons following the decay of the density peak, (3) positive plasma charging after wave breaking, leading to acceleration of some ions in the radial direction, and (4) plasma pinching by the current generated during the wave-breaking. The interplay of these effects results in the formation of various radial density profiles, which are difficult to produce in any other way.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0011617
OSTI ID:
1979303
Journal Information:
Plasma Physics and Controlled Fusion, Vol. 64, Issue 4; ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English

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