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

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.5054807· OSTI ID:1613142
 [1];  [2];  [3];  [3];  [3];  [2];  [2]
  1. Lancaster Univ., Bailrigg (United Kingdom); The Cockcroft Inst., Daresbury (United Kingdom); Univ. of Michigan, Ann Arbor, MI (United States); DOE/OSTI
  2. Lancaster Univ., Bailrigg (United Kingdom); The Cockcroft Inst., Daresbury (United Kingdom); Univ. of Michigan, Ann Arbor, MI (United States)
  3. 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.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC); Science and Technology Facilities Council (STFC); UK Engineering and Physical Sciences Research Council (EPSRC)
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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Cited By (4)

Laser-wakefield accelerators for high-resolution X-ray imaging of complex microstructures journal March 2019
Laser and electron deflection from transverse asymmetries in laser-plasma accelerators journal December 2019
Laser and Electron Deflection from Transverse Asymmetries in Laser-Plasma Accelerators text January 2019
Laser-wakefield accelerators for high-resolution X-ray imaging of complex microstructures text January 2019

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