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Title: Betatron radiation from a beam driven plasma source

Abstract

Photons produced by the betatron oscillation of electrons in a beam-driven plasma wake provide a uniquely intense and high-energy source of hard X-rays and gamma rays. This betatron radiation is interesting not only for its high intensity and spectral characteristics, but also because it can be used as a diagnostic for beam matching into the plasma, which is critical for maximizing the energy extraction efficiency of a plasma accelerator stage. At SLAC, gamma ray detection devices have been installed at the dump area of the FACET beamline where the betatron radiation from the plasma source used in the E200 plasma wakefield acceleration experiment may be observed. The ultra-dense, high-energy beam at FACET (2 Multiplication-Sign 10{sup 10} electrons, 20 Multiplication-Sign 20{mu}m{sup 2} spot, 20 - 100{mu}m length, 20GeV energy) when sent into a plasma source with a nominal density of {approx} 1 Multiplication-Sign 10{sup 17} cm{sup -3} will generate synchrotron-like spectra with critical energies well into the tens of MeV. The intensity of the radiation can be increased by introducing a radial offset to the centroid of the witness bunch, which may be achieved at FACET through the use of a transverse deflecting RF cavity. The E200 gamma ray detector hasmore » two main components: a 30 Multiplication-Sign 35cm{sup 2} phosphorescent screen for observing the transverse extent of the radiation, and a sampling electromagnetic calorimeter outfitted with photodiodes for measuring the on-axis spectrum. To estimate the spectrum, the observed intensity patterns across the calorimeter are fit with a Gaussian-integrated synchrotron spectrum and compared to simulations. Results and observations from the first FACET user run (April-June 2012) are presented.« less

Authors:
;  [1]
  1. SLAC National Accelerator Laboratory, Menlo Park, CA 94025 (United States)
Publication Date:
OSTI Identifier:
22075913
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1507; Journal Issue: 1; Conference: 15. advanced accelerator concepts workshop, Austin, TX (United States), 10-15 Jun 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; BEAM BUNCHING; BETATRON OSCILLATIONS; BETATRONS; CALORIMETRY; GAMMA DETECTION; GAMMA RADIATION; HARD X RADIATION; PARTICLE BEAMS; PHOSPHORESCENCE; PHOTODIODES; PLASMA; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA GUNS; RF SYSTEMS; STANFORD LINEAR ACCELERATOR CENTER; SYNCHROTRONS; WAKEFIELD ACCELERATORS; X-RAY DETECTION

Citation Formats

Litos, M, and Corde, S. Betatron radiation from a beam driven plasma source. United States: N. p., 2012. Web. doi:10.1063/1.4773784.
Litos, M, & Corde, S. Betatron radiation from a beam driven plasma source. United States. https://doi.org/10.1063/1.4773784
Litos, M, and Corde, S. 2012. "Betatron radiation from a beam driven plasma source". United States. https://doi.org/10.1063/1.4773784.
@article{osti_22075913,
title = {Betatron radiation from a beam driven plasma source},
author = {Litos, M and Corde, S},
abstractNote = {Photons produced by the betatron oscillation of electrons in a beam-driven plasma wake provide a uniquely intense and high-energy source of hard X-rays and gamma rays. This betatron radiation is interesting not only for its high intensity and spectral characteristics, but also because it can be used as a diagnostic for beam matching into the plasma, which is critical for maximizing the energy extraction efficiency of a plasma accelerator stage. At SLAC, gamma ray detection devices have been installed at the dump area of the FACET beamline where the betatron radiation from the plasma source used in the E200 plasma wakefield acceleration experiment may be observed. The ultra-dense, high-energy beam at FACET (2 Multiplication-Sign 10{sup 10} electrons, 20 Multiplication-Sign 20{mu}m{sup 2} spot, 20 - 100{mu}m length, 20GeV energy) when sent into a plasma source with a nominal density of {approx} 1 Multiplication-Sign 10{sup 17} cm{sup -3} will generate synchrotron-like spectra with critical energies well into the tens of MeV. The intensity of the radiation can be increased by introducing a radial offset to the centroid of the witness bunch, which may be achieved at FACET through the use of a transverse deflecting RF cavity. The E200 gamma ray detector has two main components: a 30 Multiplication-Sign 35cm{sup 2} phosphorescent screen for observing the transverse extent of the radiation, and a sampling electromagnetic calorimeter outfitted with photodiodes for measuring the on-axis spectrum. To estimate the spectrum, the observed intensity patterns across the calorimeter are fit with a Gaussian-integrated synchrotron spectrum and compared to simulations. Results and observations from the first FACET user run (April-June 2012) are presented.},
doi = {10.1063/1.4773784},
url = {https://www.osti.gov/biblio/22075913}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1507,
place = {United States},
year = {2012},
month = {12}
}