Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation

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Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation

S. Kneip, C. McGuffey, J. L. Martins, M. S. Bloom, V. Chvykov, F. Dollar, R. Fonseca, S. Jolly, G. Kalintchenko, K. Krushelnick, A. Maksimchuk, S. P. D. Mangles, Z. Najmudin, C. A. J. Palmer, K. Ta Phuoc, W. Schumaker, L. O. Silva, J. Vieira, V. Yanovsky, and A. G. R. Thomas

Phys. Rev. ST Accel. Beams 15, 021302 – Published 2 February 2012

Abstract

We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by $v_{⊥} / v_{∥}$ , the measured spectrum $γ$ , and the transverse electron bunch size in the bubble $r_{⊥}$ . The latter is obtained via the measurement of the source size of the x rays emitted by the accelerating electron bunch in the bubble. We measure a normalized rms beam transverse emittance $< 0.5 π mm mrad$ as an upper limit for a spatially Gaussian, spectrally quasimonoenergetic electron beam with 230 MeV energy in agreement with numerical modeling and analytic theory in the bubble regime.

Received 30 March 2011

DOI:https://doi.org/10.1103/PhysRevSTAB.15.021302

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Published by the American Physical Society

Authors & Affiliations

S. Kneip^1,2, C. McGuffey², J. L. Martins³, M. S. Bloom¹, V. Chvykov², F. Dollar², R. Fonseca^3,4, S. Jolly⁵, G. Kalintchenko², K. Krushelnick², A. Maksimchuk², S. P. D. Mangles¹, Z. Najmudin¹, C. A. J. Palmer¹, K. Ta Phuoc⁶, W. Schumaker², L. O. Silva³, J. Vieira³, V. Yanovsky², and A. G. R. Thomas²

¹The Blackett Laboratory, Imperial College London, London, SW7 2BZ, United Kingdom
²Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA
³GoLP/Instituto de Plasmas e Fusão Nuclear, Laboratório Associado, Instituto Superior Técnico, Lisbon, 1049-001, Portugal
⁴DCTI, ISCTE, Lisbon University Institute, Lisbon, 1649-026, Portugal
⁵Department of Physics & Astronomy, University College London, London, WC1E 6BT, United Kingdom
⁶Laboratoire d’Optique Appliquée, ENSTA ParisTech–CNRS UMR7639, Ecole Polytechnique, 91761 Palaiseau, France

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Vol. 15, Iss. 2 — February 2012

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