Numerical growth of emittance in simulations of laser-wakefield acceleration

R. Lehe; A. Lifschitz; C. Thaury; V. Malka; X. Davoine

doi:10.1103/PhysRevSTAB.16.021301

Numerical growth of emittance in simulations of laser-wakefield acceleration

R. Lehe, A. Lifschitz, C. Thaury, V. Malka, X. Davoine

Department of Physics of Complex Systems

Weizmann Institute of Science

Research output: Contribution to journal › Article › peer-review

Abstract

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. DOI: 10.1103/PhysRevSTAB.16.021301

Original language	English
Article number	021301
Number of pages	8
Journal	Physical Review Special Topics-Accelerators And Beams
Volume	16
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevSTAB.16.021301
State	Published - 28 Feb 2013

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)
Surfaces and Interfaces

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title = "Numerical growth of emittance in simulations of laser-wakefield acceleration",

abstract = "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. DOI: 10.1103/PhysRevSTAB.16.021301",

author = "R. Lehe and A. Lifschitz and C. Thaury and V. Malka and X. Davoine",

note = "We are grateful to J. Faure for fruitful discussions. This work was partially supported by the European Research Council through the PARIS ERC project (Contract No. 226424).",

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AU - Lifschitz, A.

AU - Thaury, C.

AU - Malka, V.

AU - Davoine, X.

N1 - We are grateful to J. Faure for fruitful discussions. This work was partially supported by the European Research Council through the PARIS ERC project (Contract No. 226424).

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N2 - 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. DOI: 10.1103/PhysRevSTAB.16.021301

AB - 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. DOI: 10.1103/PhysRevSTAB.16.021301

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Numerical growth of emittance in simulations of laser-wakefield acceleration

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