Towards attosecond high-energy electron bunches: controlling self-injection in laser wakefield accelerators through plasma density modulation

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11 Citations (Scopus)

Abstract

Self-injection in a laser-plasma wakefield accelerator (LWFA) is usually achieved by increasing the laser intensity until the threshold for injection is exceeded. Alternatively, the velocity of the bubble accelerating structure can be controlled using plasma density ramps, reducing the electron velocity required for injection. We present a model describing self-injection in the short bunch regime for arbitrary changes in the plasma density. We derive the threshold condition for injection due to a plasma density gradient, which is confirmed using particle-in-cell (PIC) simulations that demonstrate injection of sub-femtosecond bunches. It is shown that the bunch charge, bunch length and separation of bunches in a bunch train can be controlled by tailoring the plasma density profile.
LanguageEnglish
Article number044801
Number of pages6
JournalPhys. Rev. Lett.
Volume119
DOIs
Publication statusPublished - 26 Jul 2017

Fingerprint

high energy electrons
plasma density
accelerators
injection
modulation
lasers
plasma accelerators
thresholds
ramps
laser plasmas
bubbles
gradients
profiles
cells
electrons
simulation

Keywords

  • self-injection
  • controlled injection
  • LWFA
  • laser wakefield acceleration
  • attosecond electron bunches

Cite this

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title = "Towards attosecond high-energy electron bunches: controlling self-injection in laser wakefield accelerators through plasma density modulation",
abstract = "Self-injection in a laser-plasma wakefield accelerator (LWFA) is usually achieved by increasing the laser intensity until the threshold for injection is exceeded. Alternatively, the velocity of the bubble accelerating structure can be controlled using plasma density ramps, reducing the electron velocity required for injection. We present a model describing self-injection in the short bunch regime for arbitrary changes in the plasma density. We derive the threshold condition for injection due to a plasma density gradient, which is confirmed using particle-in-cell (PIC) simulations that demonstrate injection of sub-femtosecond bunches. It is shown that the bunch charge, bunch length and separation of bunches in a bunch train can be controlled by tailoring the plasma density profile.",
keywords = "self-injection, controlled injection, LWFA, laser wakefield acceleration, attosecond electron bunches",
author = "Tooley, {M. P.} and B. Ersfeld and Yoffe, {S. R.} and A. Noble and E. Brunetti and Sheng, {Z. M.} and Islam, {M. R.} and Jaroszynski, {D. A.}",
year = "2017",
month = "7",
day = "26",
doi = "10.1103/PhysRevLett.119.044801",
language = "English",
volume = "119",
journal = "Physical Review Letters",
issn = "0031-9007",

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TY - JOUR

T1 - Towards attosecond high-energy electron bunches

T2 - Physical Review Letters

AU - Tooley, M. P.

AU - Ersfeld, B.

AU - Yoffe, S. R.

AU - Noble, A.

AU - Brunetti, E.

AU - Sheng, Z. M.

AU - Islam, M. R.

AU - Jaroszynski, D. A.

PY - 2017/7/26

Y1 - 2017/7/26

N2 - Self-injection in a laser-plasma wakefield accelerator (LWFA) is usually achieved by increasing the laser intensity until the threshold for injection is exceeded. Alternatively, the velocity of the bubble accelerating structure can be controlled using plasma density ramps, reducing the electron velocity required for injection. We present a model describing self-injection in the short bunch regime for arbitrary changes in the plasma density. We derive the threshold condition for injection due to a plasma density gradient, which is confirmed using particle-in-cell (PIC) simulations that demonstrate injection of sub-femtosecond bunches. It is shown that the bunch charge, bunch length and separation of bunches in a bunch train can be controlled by tailoring the plasma density profile.

AB - Self-injection in a laser-plasma wakefield accelerator (LWFA) is usually achieved by increasing the laser intensity until the threshold for injection is exceeded. Alternatively, the velocity of the bubble accelerating structure can be controlled using plasma density ramps, reducing the electron velocity required for injection. We present a model describing self-injection in the short bunch regime for arbitrary changes in the plasma density. We derive the threshold condition for injection due to a plasma density gradient, which is confirmed using particle-in-cell (PIC) simulations that demonstrate injection of sub-femtosecond bunches. It is shown that the bunch charge, bunch length and separation of bunches in a bunch train can be controlled by tailoring the plasma density profile.

KW - self-injection

KW - controlled injection

KW - LWFA

KW - laser wakefield acceleration

KW - attosecond electron bunches

UR - https://journals.aps.org/prl/

UR - http://www.archer.ac.uk

U2 - 10.1103/PhysRevLett.119.044801

DO - 10.1103/PhysRevLett.119.044801

M3 - Article

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

M1 - 044801

ER -