Photon Beam Questions

• Is existing goniometer good enough?
• Should we get diamonds from S. Africa as well as Yerevan? They make nice synthetic diamonds, and are interested in joining.
• Can diamonds be thined down by keeping thicker edges? Worry is that beam will be too side at 48 GeV due to emittance growth.
• What A-line optics will be used to obtain best possible collimation? (ties into above)
• Is shielding and sweeping magnet adequate as in proposal, or do we need two collimators and two sweeping magnets.
• What is background from the electron beam dump. Is existing shielding adequate for 48 GeV?
• At what stage is Compton polarimeter needed? Should it be in right from the beginning?
• Should we have a dedicated electron/positron pair spectrometer to monitor flux versus energy?
• Do we need beam hardener before E159?
• Should we be folding GLAST tests into planning? Can photon flux be reduced to average of one photon per beam spill?
• Is SEQ far enough from detectors to avoid backgrounds?
• Should there be a photon beam position monitor (sci fi)? Is so, should it be upstream or downstream of collimator?