Day Shift, Sunday, August 25, 2002 Carlos,Eric 8:00AM RF problems, no beam for at least one hour (MCC said). 9:20AM RF problems, no beam for at least one hour (MCC said). 10:00AM Eugene calls about E-couters. first 64 E-counters scalers are down. (known from before). They were all of them at 1850V. Eugene wants to restore previous values. 10:45AM Eugene tune thresholds of E-counters around 90 (that were hot). Now everything seems OK (as by no-beam MOR counts). Couter 166 is perhaps still no OK (need to be looked at later). 11:00 Mark and Ashot attend meeting at MCC with PD. Mark Pitt and Jay Benesch were also there. o RF separator problem is being worked on. There is a bad power supply for one of the cavities. Right now there is a magnet providing the kick for directing the beam to Hall C, but this configuration prevents sending the beam to us as well. Woody is allegedly working on it. o When the RF separation hardware has been fixed, Jay will take the machine (Hall C goes down). He has one hour time limit to a) Re-establish RF separation. b) Address a dispersion problem in the machine (i. e., remove energy-position correlations in the beam). c) Work on a mismatch of quad magnets with the betatron profile of the machine if there is time. At the end of this it is hoped that we have two-hall operation and that our aspect ratio is better. Note that (b) and (c) should help Hall C as well. o When this tuning is done there may be additional tuning to do in our beamline to establish a better photon beam aspect ratio. This can be done without affecting Hall C. o The machine is scheduled to go down tomorrow morning at 9:00 am for a variety of fixes; among them re-establishing orbit locks (we have been running without them) and attempting to increase the beam current to Hall C. We might be down until the end of the day shift depending on how things go. 11:30AM Eugene and Valery in Hall Contrlled Access Look for E-counter previous HV values in tagger logbook and powercycle ADML 12:00 Cycled power on ADML crate 3. Now we see all E-counters on scalers, except the first 64 which do not have scalers. Lookup for the E-counter HV setting eneded up with the last printed out voltages from g8a, in average they are all around 1900V. 2:00PM Bad Beam back. Worse than last night. MCC sees good beam in 21 and bad in 23 . suspect scrapping in between (Gniometer and Moller)? They will check optics. 3:15 Still sterring beam. Still streched in y between 21 and 23.