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Minutes of Regular Hall C Meeting

June 7, 1999 @ 3:00 p.m.

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• Engineering: (Bill Vulcan)

• High Voltage Cable will be in on Thursday
• 90% SHV panels are made
• 90% cable tray is in for the High Voltage

• Still need to get pivet duck to SO S in

• G0 cable tray being installed

• Testing out timing SOS to the HNNS tomorrow

• A(e,e'p) update (Rolf Ent)

• X,position of Y, focus in HMS changing verses momentum
• Current Slope - -1.1 cm./GeV ("p " tune)
• 95/96 - -1.2 cm/GeV (old tune)

• Hall probe vs. PHMS:
• Q1 = B/GeV constant
• Q2 = B/GeV Constant
• Q3 = B/GeV 1% varying

• Trying to find out the difference, for Thia's experiment

• Report from R (Thia Keppel)

• Move spectrometers around

• Try to find out what starts tripping off without beam
• Remark the floor
• Surveyors and Jim Dunne will discuss what needs to happen for target survey

• Shower Counter Efficiencies (Hamlet Mkrtchyan)

• Data information

• HMS/SOS Calorimeters

• Rates and Pi/e rejection at "hot" kinematics settings for E94-110
• Shows ratio about 1 to 1
• Discusses possible upgrade: adding pre-radiator before last horoscope plane

• Luminosity Monitor (Dave Mack)

• Design Issues
• Need reasonable rate
• Sit at backward angles to stay out of way
• No PID will be done
• Using scints in D E mode, so set threshold somewhere harmless

• Correlated Spectral Function Expt. (Marko Zeier)

• Waiting for targets from machine shop
• Preliminary collaboration list E97006, shift availability shown

• Gen (Dick Madey)

• Discussion of possible smaller detector size in Polarimeter
• Current rates in 10in x 40in x 4in above 1 MHz
• Detector in each layer of the front array of the polarimeter for the Q² points attainable with a beam energy of 960 MeV per pass
• July - running some detector tests
• Measure rates
• Compare light collection (examine small pulse-height portion of ADC spectra from neutrons. Veto charged particles
• Measure time resolution
• Measure propagation time of signal from neutron arm

• G0 (Allison Lung)

• Scintillators began arriving on Friday
• Take 3 to 4 months to polish the scintillators
• Gearing up for detectors to get ready

• Modules (Steve Lassiter)

• Modules design is progressing
• Ferris wheel and platform should be ready for bid in July

• Comments (Roger Carlini)

• Short list for the new Hall C position, so far we have one (Greg Smith) who will be brought in around June 21, 1999.