On Shift: Peter Maas, Giulio Stancari Plan: Continue taking data at 3635 (search for the eta c') Summary: Inherit run 851. Stop run to reset voltage cards for the VLPC. Continue taking data through 1600 with no major problems. Integrated Luminosity: Runs 846 - 851 : 900 nb-1 852 : 225 nb-1 * 853 : 200 nb-1 854 : ongoing 0800 1600 ==================================================== Beam Momentum 6031.1 MeV/c 6031.2 MeV/c Beam Current 44.8 mAmps 40.0 mAmps Beam Lifetime 69 hours 61 hours Livetime 96.9 % 97.3 % Detailed Summary: At 8:30, Giulio notes that fibers 171-182 (both layers) are not present in the online monitor plot. The problem appeared at ~22:00, 28/11. Further investigation reveals that a VLPC Supply has tripped. At 0920, we stop the run and Giulio resets the supply. After run starts, fibers 171-182 appear in the online monitor. NB Again, people are encouraged to look at the online monitor and call the expert if they have any questions! The phone list is located between the display AP50X2 and FN835Z. At ~1145, the DAQ hangs. DYCs 1 and 11 have the PRMT light lit. DYCs 5 and 12 have the DATA_IN light lit. RESET works, and data taking resumes. However, the luminosity reported for run 852 is probably an overestimate. Nothing eventful occurs during the remainder of the shift. Peter Maas