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Minutes of Regular Hall C Meeting

November 5, 2001@ 3:00 p.m.

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¨ General (Roger Carlini)

v Moller nitrogen spill – alcove is temporarily

v ODH 1 area for tunnel per Kashy and Brindza

v Main LN₂ valve is now outside

v Understanding is that alcove will be ODH ø when new valves have been installed

v Two man rule applies now, floor and behind beam line

¨ Installation (Walter Kellner)

v Now taking inventory of all parts

v First new transportainer has been assigned to Joe Beaufait who is moving material in

v Mike Lawing has now been hired in a permanent position

¨ Engineering (Bill Vulcan)

v New laser came in and is being returned, not working

v Everything else in the hall is going well

¨ New Raster (Chen Yan)

v Linear raster system

v First 19” rack mount helicity clock generator complete

v First NIM model of raster frequency is complete

v Study of long distance cable driver is successful

v H bridge power driver fabrication partly complete

v Design remote control

v Beam halo detection for G0 with superharps

v Design and fabrication of new bases for 115m PMT’s

v 10µ Ci source test in radcom lab to be scheduled

v Software modification

v 4 channel ADC test to be made

v 2 log amplifier test to be made

v The first carbon wire replacement was not successful

v Beam line electronics

v Superharp preamps

v Renovation of superharp system

v Re-design preamps, shielding case, replace all BLM channel

v System maintenance

v GeN raster system

v Options next polarized target experiment

v Implant Hall B raster system?

v Keep present Gen raster unchanged but modify SEM software

v Lower fundamental frequency 1, reduce Q valve but still not able to run 30 Hz

v Discussion on what best option there is. What do we try to accomplish?

v FR/SR control screen upgrade – on passive Hall C display an active button for pattern density display will be added

¨ Gen (Joerg Reinhold)

v All systems are running good

v Moller measurement, turn Hall A off, we get 70%, turn Hall A on we get 67%

v Exact difference not understood yet

v This evening more Moller runs/tests

v Tuesday morning short maintenance and Mott measurement

v Target polarization increases, after anneals, less than expected

v Decay of target polarization seems to be slower though

v Shield house should be torn out in January

¨ G0 (Allison Lung)

v Cooling magnet – give one more shot, the end of November, beginning of December

v Power supply running at 5500 Amps is working

v Kellner will be in charge of shipping the magnet

v Four people from ORSAY will be coming in the second week of December for French detector installation

v Third week of January is the next G0 Collaboration Meeting

v Phil Roos has been named the on-site Deputy spokesperson for the G0 experiment

v G0 beam test for Tuesday has been dropped off the schedule. Need to find out why

¨ Gen (Dick Madey)

v Proposal for next experiment was sent out

v Showed various plots for proposal, and impact of higher Q² GEn point