E835 Weekly Meeting Minutes -- January 11, 2000 (KEG reporting) ------------------------------------------------------------------------------ NOTE: Weekly Meetings are held Tuesday and Thursdays at 5pm ------------------------------------------------------------------------------ The FCAL2000 group (Ted Vidnovic, Matt Graham and Seon-hee Seo) reported the status of the counters: 2 medium size blocks with bad PMT (located low in the stack), 1 large counter bad shaper board channel and 1 faulty base (which will be swapped with one of the dead PMT bases). There are also several fiber optics that need to be reconnected to the counters. The laser fiber optic cable couplings have arrived and installed. The FCAL 1ON-1OFF test will be done. Jason Kasper and Michelle Stancari will perform a 1ON-1OFF test of the CCAL which is mainly to check the neutral trigger cabling. There has been problem of getting the program to record the ADC values observed; TDC hits are seen. Stephen Pordes is arranging for the air conditioning in the pit be inspected and to have "stops" added to the AP50 pit crane. Mauro Marinelli reported about the testing of the Gas Jet. His tests show that the jet density as a function of pressure (along the pressure- temperature {PT} path) is the same on the beam line as was measured at PAB during the summer. The maximum density was 3.2e14 atoms/cc at a pressure of 130psi. The path keeps the temperature +1K from the saturation curve. At the maximum pressure, he has shown by hand that decreasing the temperature in steps of 0.1K, that the density increases dramatically: doubles with a change ~0.5K and just at the saturation curve nearly triples (running with liquid in the jet target; he notes that this type of running condition can not be sustained, overload the pumping, for hours). Keith Gollwitzer reported that for the first time since the IRIX upgrade, the DAQ and database were able to take and record pedestals from the pedestal configuration and then be retrieved and downloaded with the data configuration. Keith reported that on Monday evening a peak stacking rate of 0.75mA/hr (15 min) and sustained rate of 0.65mA/hr (5+ hours) was achieved. After the meeting (for which these minutes are for), an antiproton deceleration was attempted. The deceleration of the high energy ramp (injection to above the psi': ~3720MeV) was successful with 95% of the beam arriving (the losses may be understood). Phasing of the cooling systems was done and the beam lifetime reached ~200hr while the emittances were periodically blowing up. The beam was lost instantly at the beginning of the medium energy ramp; several hours were spent looking at the logged information for the cause -- none determined yet. Present: Gollwitzer, Graham, Kasper, Marinelli, Pordes, Seo, Stancari M, Vidnovic ------------------------------------------------------------------------------ Old Weekly Meeting Minutes available through WWW http://www-e835.fnal.gov/ ------------------------------------------------------------------------------ Disclaimer: Spelling, coherence and such are not guaranteed.