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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea


  • Vol. 13, Iss. 1 — Mar. 25, 2009
  • pp: 86–91

Betatron Radiation of an Off-axis Injected Electron in a Laser Wakefield Accelerator

Seok-Won Hwang and Hae-June Lee  »View Author Affiliations

Journal of the Optical Society of Korea, Vol. 13, Issue 1, pp. 86-91 (2009)

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The electrons injected into a laser wakefield undergo betatron oscillation and give rise to the emission of intense X-ray radiation. To investigate the generation conditions of the X-rays, the relativistic motion of an electron injected in an off-axis position has been simulated with wakefield profiles which are pre-calculated with a two-dimensional particle-in-cell code. The wakefield with a plasma density of <TEX>$1.78{\times}10^{18}\;cm^{-3}$</TEX> is generated by the laser with an intensity of <TEX>$1.37{\times}10^{18}\;W/cm^2$</TEX> and a pulse width of 30 fs. From the calculation of the single particle motion, the characteristics of the betatron radiation are investigated in the time domain. As the transverse injection position increases, the power and the duration time of the radiation increase, but the width of each pulse decreases.

© 2009 Optical Society of Korea

OCIS Codes
(320.2250) Ultrafast optics : Femtosecond phenomena
(340.7480) X-ray optics : X-rays, soft x-rays, extreme ultraviolet (EUV)
(350.5400) Other areas of optics : Plasmas

Original Manuscript: January 2, 2009
Revised Manuscript: February 16, 2009
Manuscript Accepted: February 17, 2009
Published: March 25, 2009

Seok-Won Hwang and Hae-June Lee, "Betatron Radiation of an Off-axis Injected Electron in a Laser Wakefield Accelerator," J. Opt. Soc. Korea 13, 86-91 (2009)

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