Numerical growth of emittance in simulations of laser-wakefield acceleration

Numerical growth of emittance in simulations of laser-wakefield acceleration

Transverse emittance is a crucial feature of laser-wakefield accelerators, yet accurately reproducing its value in numerical simulations remains challenging. It is shown here that, when the charge of the bunch exceeds a few tens of picocoulombs, particle-in-cell (PIC) simulations erroneously overest...

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Main Authors: R. Lehe, A. Lifschitz, C. Thaury, V. Malka, X. Davoine
Format: Article
Language:English
Published: American Physical Society 2013-02-01
Series:Physical Review Special Topics. Accelerators and Beams
Online Access:http://doi.org/10.1103/PhysRevSTAB.16.021301
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spelling doaj-ba3508f7f763480c9e3df077a976be6c2020-11-25T01:37:49ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022013-02-0116202130110.1103/PhysRevSTAB.16.021301Numerical growth of emittance in simulations of laser-wakefield accelerationR. LeheA. LifschitzC. ThauryV. MalkaX. DavoineTransverse emittance is a crucial feature of laser-wakefield accelerators, yet accurately reproducing its value in numerical simulations remains challenging. It is shown here that, when the charge of the bunch exceeds a few tens of picocoulombs, particle-in-cell (PIC) simulations erroneously overestimate the emittance. This is mostly due the interaction of spurious Cherenkov radiation with the bunch, which leads to a steady growth of emittance during the simulation. A new computational scheme is proposed, which is free of spurious Cherenkov radiation. It can be easily implemented in existing PIC codes and leads to a substantial reduction of the emittance growth.http://doi.org/10.1103/PhysRevSTAB.16.021301
collection DOAJ
language English
format Article
sources DOAJ
author R. Lehe
A. Lifschitz
C. Thaury
V. Malka
X. Davoine
spellingShingle R. Lehe
A. Lifschitz
C. Thaury
V. Malka
X. Davoine
Numerical growth of emittance in simulations of laser-wakefield acceleration
Physical Review Special Topics. Accelerators and Beams
author_facet R. Lehe
A. Lifschitz
C. Thaury
V. Malka
X. Davoine
author_sort R. Lehe
title Numerical growth of emittance in simulations of laser-wakefield acceleration
title_short Numerical growth of emittance in simulations of laser-wakefield acceleration
title_full Numerical growth of emittance in simulations of laser-wakefield acceleration
title_fullStr Numerical growth of emittance in simulations of laser-wakefield acceleration
title_full_unstemmed Numerical growth of emittance in simulations of laser-wakefield acceleration
title_sort numerical growth of emittance in simulations of laser-wakefield acceleration
publisher American Physical Society
series Physical Review Special Topics. Accelerators and Beams
issn 1098-4402
publishDate 2013-02-01
description Transverse emittance is a crucial feature of laser-wakefield accelerators, yet accurately reproducing its value in numerical simulations remains challenging. It is shown here that, when the charge of the bunch exceeds a few tens of picocoulombs, particle-in-cell (PIC) simulations erroneously overestimate the emittance. This is mostly due the interaction of spurious Cherenkov radiation with the bunch, which leads to a steady growth of emittance during the simulation. A new computational scheme is proposed, which is free of spurious Cherenkov radiation. It can be easily implemented in existing PIC codes and leads to a substantial reduction of the emittance growth.
url http://doi.org/10.1103/PhysRevSTAB.16.021301
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AT cthaury numericalgrowthofemittanceinsimulationsoflaserwakefieldacceleration
AT vmalka numericalgrowthofemittanceinsimulationsoflaserwakefieldacceleration
AT xdavoine numericalgrowthofemittanceinsimulationsoflaserwakefieldacceleration
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