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Title: Modeling beam-driven and laser-driven plasma Wakefield accelerators with XOOPIC

Abstract

We present 2-D particle-in-cell simulations of both beam-driven and laser-driven plasma wakefield accelerators, using the object-oriented code XOOPIC, which is time explicit, fully electromagnetic, and capable of running on massively parallel supercomputers. Simulations of laser-driven wakefields with low ({approximately} 10{sup 16} W/cm{sup 2}) and high ({approximately} 10{sup 18} W/cm{sup 2}) peak intensity laser pulses are conducted in slab geometry, showing agreement with theory. Simulations of the E-157 beam wakefield experiment at the Stanford Linear Accelerator Center, in which a 30 GeV electron beam passes through 1 m of preionized lithium plasma, are conducted in cylindrical geometry, obtaining good agreement with previous work. We briefly describe some of the more significant modifications to XOOPIC required by this work, and summarize the issues relevant to modeling electron-neutral collisions in a particle-in-cell code.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab., CA (US)
Sponsoring Org.:
USDOE Director, Office of Science (US)
OSTI Identifier:
776653
Report Number(s):
LBNL-47538
R&D Project: 455401; TRN: US0102243
DOE Contract Number:
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: 9th Workshop on Advanced Accelerator Concepts, Santa Fe, NM (US), 06/10/2000--06/16/2000; Other Information: PBD: 1 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ELECTRON BEAMS; LASERS; LITHIUM; WAKEFIELD ACCELERATORS; DESIGN; MATHEMATICAL MODELS; TWO-DIMENSIONAL CALCULATIONS; X CODES; ELECTRON COLLISIONS

Citation Formats

Bruhwiler, David L., Giacone, Rodolfo, Cary, John R., Verboncoeur, John P., Mardahl, Peter, Esarey, Eric, and Leemans, Wim. Modeling beam-driven and laser-driven plasma Wakefield accelerators with XOOPIC. United States: N. p., 2000. Web.
Bruhwiler, David L., Giacone, Rodolfo, Cary, John R., Verboncoeur, John P., Mardahl, Peter, Esarey, Eric, & Leemans, Wim. Modeling beam-driven and laser-driven plasma Wakefield accelerators with XOOPIC. United States.
Bruhwiler, David L., Giacone, Rodolfo, Cary, John R., Verboncoeur, John P., Mardahl, Peter, Esarey, Eric, and Leemans, Wim. Thu . "Modeling beam-driven and laser-driven plasma Wakefield accelerators with XOOPIC". United States. doi:. https://www.osti.gov/servlets/purl/776653.
@article{osti_776653,
title = {Modeling beam-driven and laser-driven plasma Wakefield accelerators with XOOPIC},
author = {Bruhwiler, David L. and Giacone, Rodolfo and Cary, John R. and Verboncoeur, John P. and Mardahl, Peter and Esarey, Eric and Leemans, Wim},
abstractNote = {We present 2-D particle-in-cell simulations of both beam-driven and laser-driven plasma wakefield accelerators, using the object-oriented code XOOPIC, which is time explicit, fully electromagnetic, and capable of running on massively parallel supercomputers. Simulations of laser-driven wakefields with low ({approximately} 10{sup 16} W/cm{sup 2}) and high ({approximately} 10{sup 18} W/cm{sup 2}) peak intensity laser pulses are conducted in slab geometry, showing agreement with theory. Simulations of the E-157 beam wakefield experiment at the Stanford Linear Accelerator Center, in which a 30 GeV electron beam passes through 1 m of preionized lithium plasma, are conducted in cylindrical geometry, obtaining good agreement with previous work. We briefly describe some of the more significant modifications to XOOPIC required by this work, and summarize the issues relevant to modeling electron-neutral collisions in a particle-in-cell code.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 01 00:00:00 EDT 2000},
month = {Thu Jun 01 00:00:00 EDT 2000}
}

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  • Plasma-based accelerators are discussed in which high-power short pulse lasers are the power source, suitably tailored plasma structures provide guiding of the laser beam and support large accelerating gradients, and an optical scheme is used to produce time-synchronized ultrashort electron bunches. From scaling laws laser requirements are obtained for development of compact high-energy accelerators. Simulation results of laser guiding and wakefield excitation in plasma channels, as well as laser-based injection of particles into a plasma wake, are presented. Details of the experimental program at Lawrence Berkeley National Laboratory on laser guiding, laser wakefield-based accelerators, and laser triggered injection are given.
  • The current status of the beam-driven plasma wakefield accelerators is reviewed.
  • Recent proposals for using plasma wakefield accelerators in the blowout regime as a component of a linear collider have included very intense driver and accelerating beams, which have densities many times in excess of the ambient plasma density. The electric fields of these beams are widely known to be large enough to completely expel plasma electrons from the beam path; the expelled electrons often attain relativistic velocities in the process. We examine here another aspect of this high-beam density scenario: the motion of ions. In the lowest order analysis, for both cylindrically symmetric and 'flat' beams, it is seen thatmore » for the 'after-burner' scenario discussed at AAC 2004 the ions completely collapse inside of the electron beam. In this case the ion density is significantly increased, with a large increase in the beam emittance expected as a result. We also examine a less severe scenario, where the ion collapse onset is expected, and new, coupled equilibria in the beam and plasma density are created.« less
  • Recent proposals for using plasma wakefield accelerators (PWFA) as a component of a linear collider have included intense electron beams with densities many times in excess of the plasma density. The beam's electric fields expel the plasma electrons from the beam path to many beam radii in this regime. We analyze here the motion of plasma ions under the beam fields, and find for a proposed PWFA collider scenario that the ions completely collapse inside of the beam. Simulations of ion collapse are presented. Implications of ion motion on the feasibility of the PWFA-based colliders are discussed.
  • In the recent plasma wakefield accelerator experiments at SLAC, the energy of the particles in the tail of the 42 GeV electron beam were doubled in less than one meter [1]. Simulations suggest that the acceleration length was limited by a new phenomenon--beam head erosion in self-ionized plasmas. In vacuum, a particle beam expands transversely in a distance given by {beta}*. In the blowout regime of a plasma wakefield [2], the majority of the beam is focused by the ion channel, while the beam head slowly spreads since it takes a finite time for the ion channel to form. Itmore » is observed that in self-ionized plasmas, the head spreading is exacerbated compared to that in pre-ionized plasmas, causing the ionization front to move backward (erode). A simple theoretical model is used to estimate the upper limit of the erosion rate for a bi-gaussian beam by assuming free expansion of the beam head before the ionization front. Comparison with simulations suggests that half this maximum value can serve as an estimate for the erosion rate. Critical parameters to the erosion rate are discussed.« less