As part of the process of understanding the Beam Beam counter response better, the gbrahms description has been updated with a more detailed, and hopefully accurate of the following items - Beam counter PMTs positioned at correct distance and radius relative to the mounting plates - Replace the protoype mounting plate (behind UVT) with dual square-like paltes - Added C-shaped mounting bar for the beam bema pipe. These are about 35 cm in front of BB but outside physical aperture. - Added post to same - The Fe-central platform 4-1/4 inch Fe plate was added to description . This is only turned on when the concrete floor too is (use set_tree flor o --command) - The fe plate present in the mult description was removed. - The modified files has been put into the geant CVS repository. - a couple of macro's to display setup has been added (check_beamholder.kumac, check_beam.kumac). Simple to use. Start gbrahms and 'exec check_beam or exec check_beamholder) and watch the result - Some of the pictures have been put on the gbrahms web page. The effects of these changes on the BB background will be carried out in the coming days. ------------------------------------------------------ Dr. Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 e-mail: videbaek@bnl.gov
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