Advanced

Influence of micromachined targets on laser accelerated proton beam profiles

Dalui, Malay LU ; Permogorov, Alexander LU ; Pahl, Hannes LU ; Persson, Anders LU and Wahlström, Claes Göran LU (2018) In Plasma Physics and Controlled Fusion 60(3).
Abstract

High intensity laser-driven proton acceleration from micromachined targets is studied experimentally in the target-normal-sheath-acceleration regime. Conical pits are created on the front surface of flat aluminium foils of initial thickness 12.5 and 3 μm using series of low energy pulses (0.5-2.5 μJ). Proton acceleration from such micromachined targets is compared with flat foils of equivalent thickness at a laser intensity of 7 ×1019 W cm-2. The maximum proton energy obtained from targets machined from 12.5 μm thick foils is found to be slightly lower than that of flat foils of equivalent remaining thickness, and the angular divergence of the proton beam is observed to increase as the depth of the pit approaches... (More)

High intensity laser-driven proton acceleration from micromachined targets is studied experimentally in the target-normal-sheath-acceleration regime. Conical pits are created on the front surface of flat aluminium foils of initial thickness 12.5 and 3 μm using series of low energy pulses (0.5-2.5 μJ). Proton acceleration from such micromachined targets is compared with flat foils of equivalent thickness at a laser intensity of 7 ×1019 W cm-2. The maximum proton energy obtained from targets machined from 12.5 μm thick foils is found to be slightly lower than that of flat foils of equivalent remaining thickness, and the angular divergence of the proton beam is observed to increase as the depth of the pit approaches the foil thickness. Targets machined from 3 μm thick foils, on the other hand, show evidence of increasing the maximum proton energy when the depths of the structures are small. Furthermore, shallow pits on 3 μm thick foils are found to be efficient in reducing the proton beam divergence by a factor of up to three compared to that obtained from flat foils, while maintaining the maximum proton energy.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
conical structures, laser micromachining, laser-plasma based proton acceleration
in
Plasma Physics and Controlled Fusion
volume
60
issue
3
publisher
IOP Publishing
external identifiers
  • scopus:85042144696
ISSN
0741-3335
DOI
10.1088/1361-6587/aaa79f
language
English
LU publication?
yes
id
db8b91c9-2981-424f-8a73-d9805d554934
date added to LUP
2018-03-07 07:50:11
date last changed
2018-05-29 10:22:28
@article{db8b91c9-2981-424f-8a73-d9805d554934,
  abstract     = {<p>High intensity laser-driven proton acceleration from micromachined targets is studied experimentally in the target-normal-sheath-acceleration regime. Conical pits are created on the front surface of flat aluminium foils of initial thickness 12.5 and 3 μm using series of low energy pulses (0.5-2.5 μJ). Proton acceleration from such micromachined targets is compared with flat foils of equivalent thickness at a laser intensity of 7 ×10<sup>19</sup> W cm<sup>-2</sup>. The maximum proton energy obtained from targets machined from 12.5 μm thick foils is found to be slightly lower than that of flat foils of equivalent remaining thickness, and the angular divergence of the proton beam is observed to increase as the depth of the pit approaches the foil thickness. Targets machined from 3 μm thick foils, on the other hand, show evidence of increasing the maximum proton energy when the depths of the structures are small. Furthermore, shallow pits on 3 μm thick foils are found to be efficient in reducing the proton beam divergence by a factor of up to three compared to that obtained from flat foils, while maintaining the maximum proton energy.</p>},
  articleno    = {035014},
  author       = {Dalui, Malay and Permogorov, Alexander and Pahl, Hannes and Persson, Anders and Wahlström, Claes Göran},
  issn         = {0741-3335},
  keyword      = {conical structures,laser micromachining,laser-plasma based proton acceleration},
  language     = {eng},
  month        = {02},
  number       = {3},
  publisher    = {IOP Publishing},
  series       = {Plasma Physics and Controlled Fusion},
  title        = {Influence of micromachined targets on laser accelerated proton beam profiles},
  url          = {http://dx.doi.org/10.1088/1361-6587/aaa79f},
  volume       = {60},
  year         = {2018},
}