Angular streaking of betatron X-rays in a transverse density gradient laser-wakefield accelerator

Ma, Y.; Seipt, D.; Dann, S. J.  D.; Streeter, M. J.  V.; Palmer, C. A.  J.; Willingale, L.; Thomas, A. G.  R.

doi:10.1063/1.5054807

Angular streaking of betatron X-rays in a transverse density gradient laser-wakefield accelerator

Journal Article · Fri Nov 09 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5054807· OSTI ID:1613142

^[1]; Seipt, D. ^[2]; Dann, S. J. D. ^[3]; Streeter, M. J. V. ^[3]; Palmer, C. A. J. ^[3]; Willingale, L. ^[2]; ^[2]

Lancaster Univ., Bailrigg (United Kingdom); The Cockcroft Inst., Daresbury (United Kingdom); Univ. of Michigan, Ann Arbor, MI (United States); DOE/OSTI
Lancaster Univ., Bailrigg (United Kingdom); The Cockcroft Inst., Daresbury (United Kingdom); Univ. of Michigan, Ann Arbor, MI (United States)
Lancaster Univ., Bailrigg (United Kingdom); The Cockcroft Inst., Daresbury (United Kingdom)

In a plasma with a transverse density gradient, laser wavefront tilt develops gradually due to phase velocity differences in different plasma densities. The wavefront tilt leads to a parabolic trajectory of the plasma wakefield and hence the accelerated electron beam, which leads to an angular streaking of the emitted betatron radiation. In this way, the temporal evolution of the betatron X-ray spectra will be converted into angular “streak,” i.e., having a critical energy-angle correlation. An analytical model for the curved trajectory of a laser pulse in a transverse density gradient is presented. This gives the deflection angle of the electron beam and the betatron X-rays as a function of the plasma and laser parameters, and it was verified by particle-in-cell simulations. This angular streaking could be used as a single-shot diagnostic technique to reveal the temporal evolution of betatron X-ray spectra and hence the electron acceleration itself.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: Science and Technology Facilities Council (STFC); UK Engineering and Physical Sciences Research Council (EPSRC); USDOE Office of Science (SC)

Grant/Contract Number:: SC0019186

OSTI ID:: 1613142

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 25; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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