} } Summary of the ZDC group meeting Sept 21 2000 } ============================================= } Michael Murray } }The meeting was very well attended (~20) }with half those present being }students. Angelika Dreees opened by saying that RHIC was very }pleased with the ZDC and would like us to change nothing. }Unfortunately this may not be possible, see below. } } }1) Luminosity and Cross-Sections }Anelika Drees and Z. Xu have made first estimates of }the cross section using a few vernier scans done in STAR. }They would like to have bunch by bunch scalers if this is }available from BRAHMS. } }2) Linearity: } This year the ZDCs were linear over almost the complete range. }Next year we will need to expand this range by a factor of 2 to }accommodate greater energy, more neutrons hitting the ZDC and }increased fraction of electromagnetic energy deposition at 100GeV. }This should be possible by lowering the HV but this may be a problem } for thresholds. We may need to install better cables. I }am not sure if we are terminating the 2nd output of the BRAHMS }ZDC PMTs. If so, then removing this termination should increase }the signal we see by a factor of 2. } }3) Rate effects: }These are under study. We suffered some periods of bad vacuum. }RHIC is more aware of the }need to bake out the warm sections of pipe before our IR. }I have asked Angelika if we can have radiation monitoring on a }fortnightly or monthly basis. } }4) Electronics: }Edmundo Garcia has built 8 splitters/sumers that will be used }by all the experiments. He will build 2 spares. Angelika would like }to know when the ZDC HV modules failed. She is trying to track down }the cause. } } : : Michael Murray murray@comp.tamu.edu : Cyclotron Institute, Texas A&M University, TX 77843-3366 : Telephone (979) 845 1411, FAX 1899
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