W. J. BERG, A. H. LUMPKIN B. X. YANG (ADVANCED PHOTON SOURCE, ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS USA)
There is growing interest in using inorganic crystals as radiation converters to determine transverse profiles and emittance of electron beams. Some of the more commonly available Ce-doped scintillating crystals are characterized. Electrons generated from a low-emittance rf thermionic gun are accelerated to 220 MeV through the Advanced Photon Source (APS) S-band linear accelerator. Visible radiation from the beam interaction with the crystal is transported by a set of achromatic lenses into an optical hutch for viewing with a CCD or streak camera. LSO:Ce (Lu2SiO5) and YAG:Ce (Y3AI5O12) crystals are directly compared to optical transition radiation (OTR) techniques to determine spatial resolution, linearity, and decay times. Streak images of LSO and YAG excited by the e- beam's 8-ns macrobunch show FWHM response times of 40 and 90 ns, respectively. Spectral content for LSO:Ce, YAG:Ce, and YAP:Ce (YAIO3) is found with a spectrometer using 5- to 30-keV hard x-rays impinging on the crystals. System descriptions and test results are discussed.
* Work supported by U.S Department of Energy, Office of Basic Energy Sciences, under Contract No. W-31-109-ENG-38.
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