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Title: Intrinsic beam emittance of laser-accelerated electrons measured by x-ray spectroscopic imaging

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep24622· OSTI ID:1257818
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)

Here, the recent combination of ultra-intense lasers and laser-accelerated electron beams is enabling the development of a new generation of compact x-ray light sources, the coherence of which depends directly on electron beam emittance. Although the emittance of accelerated electron beams can be low, it can grow due to the effects of space charge during free-space propagation. Direct experimental measurement of this important property is complicated by micron-scale beam sizes, and the presence of intense fields at the location where space charge acts. Reported here is a novel, non-destructive, single-shot method that overcame this problem. It employed an intense laser probe pulse, and spectroscopic imaging of the inverse-Compton scattered x-rays, allowing measurement of an ultra-low value for the normalized transverse emittance, 0.15 (±0.06) π mm mrad, as well as study of its subsequent growth upon exiting the accelerator. The technique and results are critical for designing multi-stage laser-wakefield accelerators, and generating high-brightness, spatially coherent x-rays.

Research Organization:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER15663
OSTI ID:
1257818
Journal Information:
Scientific Reports, Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (6)

Active Interrogation Probe Technologies book January 2018
Making spectral shape measurements in inverse Compton scattering a tool for advanced diagnostic applications journal January 2018
Control of quasi-monoenergetic electron beams from laser-plasma accelerators with adjustable shock density profile journal April 2018
Angular streaking of betatron X-rays in a transverse density gradient laser-wakefield accelerator journal November 2018
Proton acceleration through a charged cavity created by ultraintense laser pulse journal October 2019
Parametric emittance measurements of electron beams produced by a laser plasma accelerator journal April 2018

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