CONSIDERATIONS ON ODR BEAM-SIZE MONITORING FOR GAMMA = 1000 BEAMS*

Abstract We discuss the feasibility of monitoring the beam size of γ=1000 beams with 3000 times more charge in a video frame time and with a more sensitive 12-to 16-bit camera than were used in the previous electron beam studies at 7 GeV at the Advanced Photon Source. Such a beam would be generated at Fermilab in a new facility in the coming years. Numerical integrations of our base model show beam size sensitivity for ± 20% level changes at 200-and 400-µm base beam sizes. We also evaluated impact parameters of 5 σ y and 12 σ y for both 800-nm and 10-µm observation wavelengths. The latter examples are related to a proposal to apply the technique to an ~ 0.98 TeV proton beam, and this study shows there are trades on photon intensity and beam size sensitivity to be considered at such gammas. In addition, we report on first results at γ=1800 on a superconducting rf linac