CHANNELING RADIATION AND PARAMETRIC X-RADIATION AT ELECTRON ENERGIES BELOW 10 MEV

The intensity of channeling radiation (CR) was compared for diamond an d ruby crystals and also with the intensity of parametric X-radiation (PXR) originating from the same diamond. The investigations were carri ed out with relativistic electrons provided by the injector of the S-D ALINAC at energies between 3.0 and 9.0 MeV. Both types of radiation we re observed by means of Si(Li) detectors placed at 0 degrees and 44 de grees with respect to the electron beam axis for CR and PXR, respectiv ely. The highest photon flux Phi = 2 x 10(8) photons/(smm(2)) was foun d to result from CR of diamond crystals. Ruby crystals exhibit somewha t narrower X-ray lines but less intensity. A comparison with PXR revea ls that - against predictions - its intensity is three orders of magni tude weaker than CR under the same conditions. The possibility to use the CR and PXR as intense tunable photon sources is discussed.