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Proceedings Paper

Towards a compact 0.1-10 MeV broadband betatron photon source
Author(s): C. E. Clayton; S. F. Martins; J. L. Martins; D. K. Johnson; S. Wang; K. A. Marsh; P. Muggli; M. J. Hogan; D. Walz; R. A. Fonseca; E. Oz; C. D. Barnes; C. L. O'Connell; I. Blumenfeld; N. Kirby; R. Ischebeck; C. Huang; M. Zhou; W. Lu; S. Deng; T. Katsouleas; W. B. Mori; R. H. Siemann; L. O. Silva; C. Joshi
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Paper Abstract

When a highly relativistic electron is injected off-axis into an ion channel, the restoring force of the radial field of the ions will cause the electron to accelerate towards the axis, overshoot, and begin to undergo oscillations about the ioncolumn axis at a characteristic frequency; the betatron frequency. This so-called betatron motion will cause the electron to radiate hard x-rays in the forward direction. In two recent experiments at the Stanford Linear Accelerator Center (SLAC), betatron x-rays in the 1-20kV range and in the 1-50MV range were produced with an electron beam with an energy of 28.5 GeV for ion densities of about 1 x 1014 cm-3 and 1 x 1017cm-3, respectively. To make such an x-ray source more compact, the 3km long SLAC linac would be replaced by a source of electrons from a Laser Wakefield accelerator (LWFA). To increase the efficiency of converting laser into photons at high photon energies, we propose adding a second stage where the LWFA electrons radiate via a second ion channel, independent of the accelerating process. This two stage concept allows one to control the critical frequency of the emitted radiation as well as the efficiency of the process.

Paper Details

Date Published: 6 May 2009
PDF: 11 pages
Proc. SPIE 7359, Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond, 735902 (6 May 2009); doi: 10.1117/12.820782
Show Author Affiliations
C. E. Clayton, Univ. of California, Los Angeles (United States)
S. F. Martins, Instituto Superior Técnico (Portugal)
J. L. Martins, Instituto Superior Técnico (Portugal)
D. K. Johnson, Univ. of California, Los Angeles (United States)
S. Wang, Univ. of California, Los Angeles (United States)
K. A. Marsh, Univ. of California, Los Angeles (United States)
P. Muggli, Univ. of Southern California (United States)
M. J. Hogan, Univ. of Southern California (United States)
D. Walz, Univ. of Southern California (United States)
R. A. Fonseca, Instituto Superior Técnico (Portugal)
E. Oz, Univ. of Southern California (United States)
C. D. Barnes, Univ. of Southern California (United States)
C. L. O'Connell, Univ. of Southern California (United States)
I. Blumenfeld, Univ. of Southern California (United States)
N. Kirby, Univ. of Southern California (United States)
R. Ischebeck, Univ. of Southern California (United States)
C. Huang, Univ. of California, Los Angeles (United States)
M. Zhou, Univ. of California, Los Angeles (United States)
W. Lu, Univ. of California, Los Angeles (United States)
S. Deng, Univ. of Southern California (United States)
T. Katsouleas, Univ. of Southern California (United States)
W. B. Mori, Univ. of California, Los Angeles (United States)
R. H. Siemann, Univ. of Southern California (United States)
L. O. Silva, Instituto Superior Técnico (Portugal)
C. Joshi, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 7359:
Harnessing Relativistic Plasma Waves as Novel Radiation Sources from Terahertz to X-Rays and Beyond
Dino A. Jaroszynski; Antoine Rousse, Editor(s)

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