The role of the gas/plasma plume and self-focusing in a gas-filled capillary discharge waveguide for high-power laser-plasma applications

Cristian Ciocarlan, Mark Wiggins, Mohammad Islam, Bernhard Ersfeld, Salima Saleh Abu-Azoum, Robbie Wilson, Constantin Aniculaesei, Gregor H. Welsh, Gregory Vieux, Dino Jaroszynski

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The role of the gas/plasma plume at the entrance of a gas-filled capillary discharge plasma waveguide in increasing the laser intensity has been investigated. Distinction is made between neutral gas and hot plasma plumes that, respectively, develop before and after discharge breakdown. Time-averaged measurements show that the on-axis plasma density of a fully expanded plasma plume over this region is similar to that inside the waveguide. Above the critical power, relativistic and ponderomotive self-focusing lead to an increase in the intensity, which can be nearly a factor of 2 compared with the case without a plume. When used as a laser plasma wakefield accelerator, the enhancement of intensity can lead to prompt electron injection very close to the entrance of the waveguide. Self-focusing occurs within two Rayleigh lengths of the waveguide entrance plane in the region, where the laser beam is converging. Analytical theory and numerical simulations show that, for a density of 3.0 × 1018 cm−3, the peak normalized laser vector potential, a 0, increases from 1.0 to 1.85 close to the entrance plane of the capillary compared with a 0 = 1.41 when the plume is neglected.
LanguageEnglish
Article number093108
Number of pages7
JournalPhysics of Plasmas
Volume20
Early online date24 Sep 2013
DOIs
Publication statusPublished - 2013

Fingerprint

self focusing
laser plasmas
high power lasers
plumes
entrances
waveguides
gases
plasma accelerators
neutral gases
high temperature plasmas
plasma jets
plasma density
lasers
breakdown
time measurement
laser beams
injection
augmentation
electrons
simulation

Keywords

  • gas/plasma plume
  • neutral gas
  • hot plasma plumes
  • plasma density
  • laser plasma wakefield accelerator

Cite this

@article{a5270589ef304bd0aa66ea02bd8108ce,
title = "The role of the gas/plasma plume and self-focusing in a gas-filled capillary discharge waveguide for high-power laser-plasma applications",
abstract = "The role of the gas/plasma plume at the entrance of a gas-filled capillary discharge plasma waveguide in increasing the laser intensity has been investigated. Distinction is made between neutral gas and hot plasma plumes that, respectively, develop before and after discharge breakdown. Time-averaged measurements show that the on-axis plasma density of a fully expanded plasma plume over this region is similar to that inside the waveguide. Above the critical power, relativistic and ponderomotive self-focusing lead to an increase in the intensity, which can be nearly a factor of 2 compared with the case without a plume. When used as a laser plasma wakefield accelerator, the enhancement of intensity can lead to prompt electron injection very close to the entrance of the waveguide. Self-focusing occurs within two Rayleigh lengths of the waveguide entrance plane in the region, where the laser beam is converging. Analytical theory and numerical simulations show that, for a density of 3.0 × 1018 cm−3, the peak normalized laser vector potential, a 0, increases from 1.0 to 1.85 close to the entrance plane of the capillary compared with a 0 = 1.41 when the plume is neglected.",
keywords = "gas/plasma plume, neutral gas, hot plasma plumes, plasma density, laser plasma wakefield accelerator",
author = "Cristian Ciocarlan and Mark Wiggins and Mohammad Islam and Bernhard Ersfeld and Abu-Azoum, {Salima Saleh} and Robbie Wilson and Constantin Aniculaesei and Welsh, {Gregor H.} and Gregory Vieux and Dino Jaroszynski",
year = "2013",
doi = "10.1063/1.4822333",
language = "English",
volume = "20",
journal = "Physics of Plasmas",
issn = "1070-664X",

}

TY - JOUR

T1 - The role of the gas/plasma plume and self-focusing in a gas-filled capillary discharge waveguide for high-power laser-plasma applications

AU - Ciocarlan, Cristian

AU - Wiggins, Mark

AU - Islam, Mohammad

AU - Ersfeld, Bernhard

AU - Abu-Azoum, Salima Saleh

AU - Wilson, Robbie

AU - Aniculaesei, Constantin

AU - Welsh, Gregor H.

AU - Vieux, Gregory

AU - Jaroszynski, Dino

PY - 2013

Y1 - 2013

N2 - The role of the gas/plasma plume at the entrance of a gas-filled capillary discharge plasma waveguide in increasing the laser intensity has been investigated. Distinction is made between neutral gas and hot plasma plumes that, respectively, develop before and after discharge breakdown. Time-averaged measurements show that the on-axis plasma density of a fully expanded plasma plume over this region is similar to that inside the waveguide. Above the critical power, relativistic and ponderomotive self-focusing lead to an increase in the intensity, which can be nearly a factor of 2 compared with the case without a plume. When used as a laser plasma wakefield accelerator, the enhancement of intensity can lead to prompt electron injection very close to the entrance of the waveguide. Self-focusing occurs within two Rayleigh lengths of the waveguide entrance plane in the region, where the laser beam is converging. Analytical theory and numerical simulations show that, for a density of 3.0 × 1018 cm−3, the peak normalized laser vector potential, a 0, increases from 1.0 to 1.85 close to the entrance plane of the capillary compared with a 0 = 1.41 when the plume is neglected.

AB - The role of the gas/plasma plume at the entrance of a gas-filled capillary discharge plasma waveguide in increasing the laser intensity has been investigated. Distinction is made between neutral gas and hot plasma plumes that, respectively, develop before and after discharge breakdown. Time-averaged measurements show that the on-axis plasma density of a fully expanded plasma plume over this region is similar to that inside the waveguide. Above the critical power, relativistic and ponderomotive self-focusing lead to an increase in the intensity, which can be nearly a factor of 2 compared with the case without a plume. When used as a laser plasma wakefield accelerator, the enhancement of intensity can lead to prompt electron injection very close to the entrance of the waveguide. Self-focusing occurs within two Rayleigh lengths of the waveguide entrance plane in the region, where the laser beam is converging. Analytical theory and numerical simulations show that, for a density of 3.0 × 1018 cm−3, the peak normalized laser vector potential, a 0, increases from 1.0 to 1.85 close to the entrance plane of the capillary compared with a 0 = 1.41 when the plume is neglected.

KW - gas/plasma plume

KW - neutral gas

KW - hot plasma plumes

KW - plasma density

KW - laser plasma wakefield accelerator

UR - http://www.scopus.com/inward/record.url?scp=84885053701&partnerID=8YFLogxK

UR - http://scitation.aip.org/content/aip/journal/pop

U2 - 10.1063/1.4822333

DO - 10.1063/1.4822333

M3 - Article

VL - 20

JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

M1 - 093108

ER -