Enhanced proton beam collimation in the ultra-intense short pulse regime

J S Green, N P Dover, M Borghesi, C M Brenner, F H Cameron, D C Carroll, P S Foster, P Gallegos, G Gregori, P McKenna, C D Murphy, Z Najmudin, C A J Palmer, R Prasad, L Romagnani, K E Quinn, J Schreiber, M J V Streeter, S Ter-Avetisyan, O Tresca & 2 others M Zepf, D Neely

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The collimation of proton beams accelerated during ultra-intense laser irradiation of thin aluminum foils was measured experimentally whilst varying laser contrast. Increasing the laser contrast using a double plasma mirror system resulted in a marked decrease in proton beam divergence (20° to <10°), and the enhanced collimation persisted over a wide range of target thicknesses (50 nm–6 µm), with an increased flux towards thinner targets. Supported by numerical simulation, the larger beam divergence at low contrast is attributed to the presence of a significant plasma scale length on the target front surface. This alters the fast electron generation and injection into the target, affecting the resultant sheath distribution and dynamics at the rear target surface. This result demonstrates that careful control of the laser contrast will be important for future laser-driven ion applications in which control of beam divergence is crucial.
LanguageEnglish
Article number084001
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume56
Issue number8
DOIs
Publication statusPublished - 22 Jul 2014

Fingerprint

Proton beams
collimation
Ultrashort pulses
proton beams
Lasers
pulses
divergence
lasers
Plasmas
Aluminum foil
Laser beam effects
target thickness
Mirrors
sheaths
Fluxes
foils
Electrons
injection
mirrors
Computer simulation

Keywords

  • proton beams
  • collimated beams
  • laser irradiation
  • aluminium
  • plasma mirrors
  • divergence
  • electron
  • laser ionization

Cite this

Green, J. S., Dover, N. P., Borghesi, M., Brenner, C. M., Cameron, F. H., Carroll, D. C., ... Neely, D. (2014). Enhanced proton beam collimation in the ultra-intense short pulse regime. Plasma Physics and Controlled Fusion, 56(8), [084001]. https://doi.org/10.1088/0741-3335/56/8/084001
Green, J S ; Dover, N P ; Borghesi, M ; Brenner, C M ; Cameron, F H ; Carroll, D C ; Foster, P S ; Gallegos, P ; Gregori, G ; McKenna, P ; Murphy, C D ; Najmudin, Z ; Palmer, C A J ; Prasad, R ; Romagnani, L ; Quinn, K E ; Schreiber, J ; Streeter, M J V ; Ter-Avetisyan, S ; Tresca, O ; Zepf, M ; Neely, D. / Enhanced proton beam collimation in the ultra-intense short pulse regime. In: Plasma Physics and Controlled Fusion. 2014 ; Vol. 56, No. 8.
@article{6d911da0110b4d9094629131fc5b2720,
title = "Enhanced proton beam collimation in the ultra-intense short pulse regime",
abstract = "The collimation of proton beams accelerated during ultra-intense laser irradiation of thin aluminum foils was measured experimentally whilst varying laser contrast. Increasing the laser contrast using a double plasma mirror system resulted in a marked decrease in proton beam divergence (20° to <10°), and the enhanced collimation persisted over a wide range of target thicknesses (50 nm–6 µm), with an increased flux towards thinner targets. Supported by numerical simulation, the larger beam divergence at low contrast is attributed to the presence of a significant plasma scale length on the target front surface. This alters the fast electron generation and injection into the target, affecting the resultant sheath distribution and dynamics at the rear target surface. This result demonstrates that careful control of the laser contrast will be important for future laser-driven ion applications in which control of beam divergence is crucial.",
keywords = "proton beams, collimated beams, laser irradiation, aluminium , plasma mirrors, divergence, electron, laser ionization",
author = "Green, {J S} and Dover, {N P} and M Borghesi and Brenner, {C M} and Cameron, {F H} and Carroll, {D C} and Foster, {P S} and P Gallegos and G Gregori and P McKenna and Murphy, {C D} and Z Najmudin and Palmer, {C A J} and R Prasad and L Romagnani and Quinn, {K E} and J Schreiber and Streeter, {M J V} and S Ter-Avetisyan and O Tresca and M Zepf and D Neely",
year = "2014",
month = "7",
day = "22",
doi = "10.1088/0741-3335/56/8/084001",
language = "English",
volume = "56",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
number = "8",

}

Green, JS, Dover, NP, Borghesi, M, Brenner, CM, Cameron, FH, Carroll, DC, Foster, PS, Gallegos, P, Gregori, G, McKenna, P, Murphy, CD, Najmudin, Z, Palmer, CAJ, Prasad, R, Romagnani, L, Quinn, KE, Schreiber, J, Streeter, MJV, Ter-Avetisyan, S, Tresca, O, Zepf, M & Neely, D 2014, 'Enhanced proton beam collimation in the ultra-intense short pulse regime' Plasma Physics and Controlled Fusion, vol. 56, no. 8, 084001. https://doi.org/10.1088/0741-3335/56/8/084001

Enhanced proton beam collimation in the ultra-intense short pulse regime. / Green, J S ; Dover, N P; Borghesi, M; Brenner, C M; Cameron, F H; Carroll, D C; Foster, P S; Gallegos, P; Gregori, G; McKenna, P; Murphy, C D; Najmudin, Z; Palmer, C A J; Prasad, R; Romagnani, L; Quinn, K E; Schreiber, J; Streeter, M J V; Ter-Avetisyan, S; Tresca, O; Zepf, M; Neely, D.

In: Plasma Physics and Controlled Fusion, Vol. 56, No. 8, 084001, 22.07.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Enhanced proton beam collimation in the ultra-intense short pulse regime

AU - Green, J S

AU - Dover, N P

AU - Borghesi, M

AU - Brenner, C M

AU - Cameron, F H

AU - Carroll, D C

AU - Foster, P S

AU - Gallegos, P

AU - Gregori, G

AU - McKenna, P

AU - Murphy, C D

AU - Najmudin, Z

AU - Palmer, C A J

AU - Prasad, R

AU - Romagnani, L

AU - Quinn, K E

AU - Schreiber, J

AU - Streeter, M J V

AU - Ter-Avetisyan, S

AU - Tresca, O

AU - Zepf, M

AU - Neely, D

PY - 2014/7/22

Y1 - 2014/7/22

N2 - The collimation of proton beams accelerated during ultra-intense laser irradiation of thin aluminum foils was measured experimentally whilst varying laser contrast. Increasing the laser contrast using a double plasma mirror system resulted in a marked decrease in proton beam divergence (20° to <10°), and the enhanced collimation persisted over a wide range of target thicknesses (50 nm–6 µm), with an increased flux towards thinner targets. Supported by numerical simulation, the larger beam divergence at low contrast is attributed to the presence of a significant plasma scale length on the target front surface. This alters the fast electron generation and injection into the target, affecting the resultant sheath distribution and dynamics at the rear target surface. This result demonstrates that careful control of the laser contrast will be important for future laser-driven ion applications in which control of beam divergence is crucial.

AB - The collimation of proton beams accelerated during ultra-intense laser irradiation of thin aluminum foils was measured experimentally whilst varying laser contrast. Increasing the laser contrast using a double plasma mirror system resulted in a marked decrease in proton beam divergence (20° to <10°), and the enhanced collimation persisted over a wide range of target thicknesses (50 nm–6 µm), with an increased flux towards thinner targets. Supported by numerical simulation, the larger beam divergence at low contrast is attributed to the presence of a significant plasma scale length on the target front surface. This alters the fast electron generation and injection into the target, affecting the resultant sheath distribution and dynamics at the rear target surface. This result demonstrates that careful control of the laser contrast will be important for future laser-driven ion applications in which control of beam divergence is crucial.

KW - proton beams

KW - collimated beams

KW - laser irradiation

KW - aluminium

KW - plasma mirrors

KW - divergence

KW - electron

KW - laser ionization

UR - http://iopscience.iop.org/0741-3335

U2 - 10.1088/0741-3335/56/8/084001

DO - 10.1088/0741-3335/56/8/084001

M3 - Article

VL - 56

JO - Plasma Physics and Controlled Fusion

T2 - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 8

M1 - 084001

ER -

Green JS, Dover NP, Borghesi M, Brenner CM, Cameron FH, Carroll DC et al. Enhanced proton beam collimation in the ultra-intense short pulse regime. Plasma Physics and Controlled Fusion. 2014 Jul 22;56(8). 084001. https://doi.org/10.1088/0741-3335/56/8/084001