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Betatron emission as a diagnostic for injection and acceleration mechanisms in laser plasma accelerators

Corde, S.; Thaury, C.; Phuoc, K. Ta; Lifschitz, A.; Lambert, G.; Lundh, Olle LU ; Brijesh, P.; Arantchuk, L.; Sebban, S. and Rousse, A., et al. (2012) In Plasma Physics and Controlled Fusion 54(12).
Abstract
Betatron x-ray emission in laser plasma accelerators is a promising compact source that may be an alternative to conventional x-ray sources, based on large scale machines. In addition to its potential as a source, precise measurements of betatron emission can reveal crucial information about relativistic laser-plasma interaction. We show that the emission length and the position of the x-ray emission can be obtained by placing an aperture mask close to the source, and by measuring the beam profile of the betatron x-ray radiation far from the aperture mask. The position of the x-ray emission gives information on plasma wave breaking and hence on the laser non-linear propagation. Moreover, the measurement of the longitudinal extension helps... (More)
Betatron x-ray emission in laser plasma accelerators is a promising compact source that may be an alternative to conventional x-ray sources, based on large scale machines. In addition to its potential as a source, precise measurements of betatron emission can reveal crucial information about relativistic laser-plasma interaction. We show that the emission length and the position of the x-ray emission can be obtained by placing an aperture mask close to the source, and by measuring the beam profile of the betatron x-ray radiation far from the aperture mask. The position of the x-ray emission gives information on plasma wave breaking and hence on the laser non-linear propagation. Moreover, the measurement of the longitudinal extension helps one to determine whether the acceleration is limited by pump depletion or dephasing effects. In the case of multiple injections, it is used to retrieve unambiguously the position in the plasma of each injection. This technique is also used to study how, in a capillary discharge, the variations of the delay between the discharge and the laser pulse affect the interaction. The study reveals that, for a delay appropriate for laser guiding, the x-ray emission only occurs in the second half of the capillary: no electrons are injected and accelerated in the first half. (Less)
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Plasma Physics and Controlled Fusion
volume
54
issue
12
publisher
IOP Publishing
external identifiers
  • wos:000312579500026
  • scopus:84870178683
ISSN
0741-3335
DOI
10.1088/0741-3335/54/12/124023
language
English
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yes
id
61f230ab-c912-4da7-aba9-fbe976ea7213 (old id 3366270)
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2013-01-23 14:33:52
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2017-01-01 03:24:41
@article{61f230ab-c912-4da7-aba9-fbe976ea7213,
  abstract     = {Betatron x-ray emission in laser plasma accelerators is a promising compact source that may be an alternative to conventional x-ray sources, based on large scale machines. In addition to its potential as a source, precise measurements of betatron emission can reveal crucial information about relativistic laser-plasma interaction. We show that the emission length and the position of the x-ray emission can be obtained by placing an aperture mask close to the source, and by measuring the beam profile of the betatron x-ray radiation far from the aperture mask. The position of the x-ray emission gives information on plasma wave breaking and hence on the laser non-linear propagation. Moreover, the measurement of the longitudinal extension helps one to determine whether the acceleration is limited by pump depletion or dephasing effects. In the case of multiple injections, it is used to retrieve unambiguously the position in the plasma of each injection. This technique is also used to study how, in a capillary discharge, the variations of the delay between the discharge and the laser pulse affect the interaction. The study reveals that, for a delay appropriate for laser guiding, the x-ray emission only occurs in the second half of the capillary: no electrons are injected and accelerated in the first half.},
  articleno    = {124023},
  author       = {Corde, S. and Thaury, C. and Phuoc, K. Ta and Lifschitz, A. and Lambert, G. and Lundh, Olle and Brijesh, P. and Arantchuk, L. and Sebban, S. and Rousse, A. and Faure, J. and Malka, V.},
  issn         = {0741-3335},
  language     = {eng},
  number       = {12},
  publisher    = {IOP Publishing},
  series       = {Plasma Physics and Controlled Fusion},
  title        = {Betatron emission as a diagnostic for injection and acceleration mechanisms in laser plasma accelerators},
  url          = {http://dx.doi.org/10.1088/0741-3335/54/12/124023},
  volume       = {54},
  year         = {2012},
}