Far-field OTR and ODR images produced by 7-GeV electron beams at APS

A.H. Lumpkin, B.X. Yang, W.J. Berg, N.S. Sereno, C.-Y. Yao, D.W. Rule
2007 2007 IEEE Particle Accelerator Conference (PAC)  
We have investigated the angular distribution patterns (far-field focus) of optical transition radiation (OTR) and optical diffraction radiation (ODR) generated by 7-GeV electron beams passing through and near an Al metal plane, respectively. The 70-μrad opening angles of the OTR patterns provide calibration factors for the system. Effects of the upstream quadrupole focusing strength on the patterns as well as polarization effects were observed. The OTR data are compared to an existing OTR
more » ... efoil model, while ODR profile results are compared to expressions for single-edge diffraction. ODR was studied with impact parameters of about 1.25 mm, close to the gamma lambda-bar value of 1.4 mm for 628-nm radiation. We expect angle-pointing information along the x axis parallel to the mirror edge is available from the single-lobe ODR data as well as divergence information at the sub-100-μrad level. Experimental and model results will be presented.
doi:10.1109/pac.2007.4440011 fatcat:pph6cls2vjg2xlqs7t7if2s25y