Non-invasive characterisation of a laser-driven positron beam

Aaron Alejo; Guillermo Javier Samarin; Richard Warwick; Conor McCluskey; Giada Cantono; Tiberio Ceccotti; Sandrine Dobosz Dufrénoy; Pascal Monot; Gianluca Sarri

doi:10.1088/1361-6587/ab7e81

Non-invasive characterisation of a laser-driven positron beam

Aaron Alejo, Guillermo Javier Samarin, Richard Warwick, Conor McCluskey, Giada Cantono, Tiberio Ceccotti, Sandrine Dobosz Dufrénoy, Pascal Monot, Gianluca Sarri

School of Mathematics and Physics

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Abstract

We report on an indirect and non-invasive method to simultaneously characterise the energy-dependent emittance and source size of ultra-relativistic positron beams generated during the propagation of a laser-wakefield accelerated electron beam through a high-Z converter target. The strong correlation of the geometrical emittance of the positrons with that of the scattered electrons allows the former to be inferred, with high accuracy, from monitoring the latter. The technique has been tested in a proof-of-principle experiment where, for 100 MeV positrons, we infer geometrical emittances and source sizes of the order of 3micron and 150 micron, respectively. This is consistent with the numerically predicted possibility of achieving sub-micron geometrical emittances and micron-scale source sizes at the GeV level.

Original language	English
Article number	055013
Number of pages	7
Journal	Plasma Physics and Controlled Fusion
Volume	62
Issue number	5
Early online date	10 Mar 2020
DOIs	https://doi.org/10.1088/1361-6587/ab7e81
Publication status	Published - 20 Apr 2020

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10.1088/1361-6587/ab7e81Licence: CC BY

Non-invasive characterisation of a laser-driven positron beam
Copyright 2020 the authors. This is an open access article published under a Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.
Final published version, 1.32 MBLicence: CC BY

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Alejo, A., Samarin, G. J., Warwick, R., McCluskey, C., Cantono, G., Ceccotti, T., Dobosz Dufrénoy, S., Monot, P., & Sarri, G. (2020). Non-invasive characterisation of a laser-driven positron beam. Plasma Physics and Controlled Fusion, 62(5), [055013]. https://doi.org/10.1088/1361-6587/ab7e81

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abstract = "We report on an indirect and non-invasive method to simultaneously characterise the energy-dependent emittance and source size of ultra-relativistic positron beams generated during the propagation of a laser-wakefield accelerated electron beam through a high-Z converter target. The strong correlation of the geometrical emittance of the positrons with that of the scattered electrons allows the former to be inferred, with high accuracy, from monitoring the latter. The technique has been tested in a proof-of-principle experiment where, for 100 MeV positrons, we infer geometrical emittances and source sizes of the order of 3micron and 150 micron, respectively. This is consistent with the numerically predicted possibility of achieving sub-micron geometrical emittances and micron-scale source sizes at the GeV level.",

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AU - Alejo, Aaron

AU - Samarin, Guillermo Javier

AU - Warwick, Richard

AU - McCluskey, Conor

AU - Cantono, Giada

AU - Ceccotti, Tiberio

AU - Dobosz Dufrénoy, Sandrine

AU - Monot, Pascal

AU - Sarri, Gianluca

PY - 2020/4/20

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N2 - We report on an indirect and non-invasive method to simultaneously characterise the energy-dependent emittance and source size of ultra-relativistic positron beams generated during the propagation of a laser-wakefield accelerated electron beam through a high-Z converter target. The strong correlation of the geometrical emittance of the positrons with that of the scattered electrons allows the former to be inferred, with high accuracy, from monitoring the latter. The technique has been tested in a proof-of-principle experiment where, for 100 MeV positrons, we infer geometrical emittances and source sizes of the order of 3micron and 150 micron, respectively. This is consistent with the numerically predicted possibility of achieving sub-micron geometrical emittances and micron-scale source sizes at the GeV level.

AB - We report on an indirect and non-invasive method to simultaneously characterise the energy-dependent emittance and source size of ultra-relativistic positron beams generated during the propagation of a laser-wakefield accelerated electron beam through a high-Z converter target. The strong correlation of the geometrical emittance of the positrons with that of the scattered electrons allows the former to be inferred, with high accuracy, from monitoring the latter. The technique has been tested in a proof-of-principle experiment where, for 100 MeV positrons, we infer geometrical emittances and source sizes of the order of 3micron and 150 micron, respectively. This is consistent with the numerically predicted possibility of achieving sub-micron geometrical emittances and micron-scale source sizes at the GeV level.

U2 - 10.1088/1361-6587/ab7e81

DO - 10.1088/1361-6587/ab7e81

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