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Minutes of Regular Hall C Meeting

October 22, 2001@ 3:00 p.m.

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¨ General (Rolf Ent)

v The hall will close Wednesday at noon for beam

v Accelerator started restoring beam after recovering from an LCW pipe rupture

¨ Installation (Walter Kellner)

v Ferris Wheel work was completed

v Gen small jobs were completed and are ready for Wednesday

v Hall beam infrastructure is progressing well

¨ Engineering (Paul Brindza)

v Maintenance on HMS magnets is being worked on

v Quadrupole heaters needed work, almost done

¨ Moller Status/ODH event (Howard Fenker)

v Last Friday a test on JT valve controller was made, resulting in N₂ exhaust through a relief

v The N₂ loss resulted in an ODH alarm by the He sensor

v It appeared a N₂ sensor was missing, has been installed now

v The relief valve is going to be changed to 35 PSI (from 15 PSI)

v A relief line is installed to vent the gas (initially) in the hall.

¨ Gen (Marko Zeier)

v Polarized target magnet was turned off over the weekend, start up today to do thermal equilibrium measurements

v N Detector is operational and ready

v Hamlet did test on laser and HMS detectors last week

v Epics monitors were done by Steve Wood

v Concerns: beam current asymmetry because of 3 laser operation, and beam leakage

v Injector test at 15 micro-amps slow leakage of less than 1% by Hall A laser, with slits closed to 100-150 nAmps

v Raster frequency will be 1H2 after all

v Friday to survey beam line with vertical chicane

¨ General (Hamlet Mkrtchyan)

v HMS hodoscopes had some problems, fixed. Will get Bill to look at it tomorrow

v Noisy plane (2V1) in chamber

v Today there were problems with laser, will look into it.

¨ G0 (Greg Smith)

v 4,000 connections for G0 Ferris Wheel were made, thanks all involved

v With additional access time, cables could be tested too

v 6 or 7 octants were finished, job well done

v 32 multi connector HV cables, will come in Friday

v Alignment work of chambers was done, may need one more try

v Leakage of French octant PMT’s was false alarm, was due to working of monitoring PMT

v Fiber optics will get plugged in today and tomorrow

¨ Gen (Dick Madey)

v Showed data from his run

v Showed various cuts selecting proper quasifree events in invariant mass spectra