Laser-driven generation of collimated ultra-relativistic positron beams

G. Sarri*, W. Schumaker, A. Di Piazza, K. Poder, J. M. Cole, M. Vargas, D. Doria, S. Kushel, B. Dromey, G. Grittani, L. Gizzi, M. E. Dieckmann, A. Green, V. Chvykov, A. Maksimchuk, V. Yanovsky, Z. H. He, B. X. Hou, J. A. Nees, S. KarZ. Najmudin, A. G. R. Thomas, C. H. Keitel, K. Krushelnick, M. Zepf

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report on recent experimental results concerning the generation of collimated (divergence of the order of a few mrad) ultra-relativistic positron beams using a fully optical system. The positron beams are generated exploiting a quantum-electrodynamic cascade initiated by the propagation of a laser-accelerated, ultra-relativistic electron beam through high-Z solid targets. As long as the target thickness is comparable to or smaller than the radiation length of the material, the divergence of the escaping positron beam is of the order of the inverse of its Lorentz factor. For thicker solid targets the divergence is seen to gradually increase, due to the increased number of fundamental steps in the cascade, but it is still kept of the order of few tens of mrad, depending on the spectral components in the beam. This high degree of collimation will be fundamental for further injection into plasma-wakefield afterburners.

Original languageEnglish
Article number124017
Pages (from-to)1-6
Number of pages6
JournalPlasma Physics and Controlled Fusion
Volume55
Issue number12
DOIs
Publication statusPublished - 28 Nov 2013
Event40th Conference of the European-Physical-Society on Plasma Physics - Espoo, Finland
Duration: 01 Jul 201305 Jul 2013

Keywords

  • ACCELERATOR
  • ELECTRONS
  • PULSES
  • ENERGY
  • SYSTEM

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear Energy and Engineering

Cite this

Sarri, G., Schumaker, W., Di Piazza, A., Poder, K., Cole, J. M., Vargas, M., Doria, D., Kushel, S., Dromey, B., Grittani, G., Gizzi, L., Dieckmann, M. E., Green, A., Chvykov, V., Maksimchuk, A., Yanovsky, V., He, Z. H., Hou, B. X., Nees, J. A., ... Zepf, M. (2013). Laser-driven generation of collimated ultra-relativistic positron beams. Plasma Physics and Controlled Fusion, 55(12), 1-6. [124017]. https://doi.org/10.1088/0741-3335/55/12/124017