Coherent X-ray Cherenkov radiation produced by microbunched beams

Abstract

Analytical and numerical results on the coherent X-ray Cherenkov radiation (CXCR) produced by microbunched beams in the region near the K-, L-edges of materials are obtained. The results show that CXCR can serve as a suitable mechanism for production intense beams of photons in the "water window" region as well as for studying the important microbunching process at FLASH TESLA, LCLS and other FELs.

Observation of soft X-ray Cherenkov radiation in Al

“…A much higher intensity can be achieved via coherent emission, i.e., the longitudinal dimension of an ultra-short bunch is smaller than the CR wavelength, which can be achieved by a laser slicing or deliberately induced microbunching in the SXR wavelength range [13][14][15]. On the other hand, CR in SXR region can be used for transverse beam size and emittance diagnostics to reduce the diffraction limit [16,17] and to minimise the effect of the coherent radiation contribution [18,19] at, for example, an XFEL facility.…”