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Minutes of Regular Hall C Meeting

May 17, 1999 @ 3:00 p.m.

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• Engineering: (Paul Brindza)

• Magnets trips mostly related to

• One time magnet PC lost a disk, restored disk

• June Shutdown

• 3 cell blocks in cryotarget look good

• 1 leak, but now fixed

• Pressure tested at 410 lbs.

• Loops are test fitted, 1 to 2 minor problems

• Final fit later this week, 3 loops should fine
• Target design due in today

• Found possible interference SOS - beamline for HNSS

Experiment, need survey done

• 1-2 days in June for survey

• Overview of last weeks run: (Antje Bruell)

• Beam on target, ¹H, only 40 m A!
• Beam off to:
• Increase current
• Hall B energy charge

• Beam on target again, finished dummy running

• Switched to ²H target, finished

• Beam off to:

• Increase current/polarization for Hall A

• Optics problems, etc…

• Beam back
• Finished ¹H statistics

• Current calibration

• Target boiling test (²H), (1.0 ± 0.5) % at 60 m A

• Energy measurement, (4.471 ± 0.006) GeV

• Start running on ¹²C

• Q1 problems, exchange disk

• HMS HV problem, be careful when pulling out/putting back cords!

• HMS’ magnet rip rate still ~ Ù /4 hours

• Switch to ⁵⁶Fe this afternoon/evening!

• SOS problems(Steve Wood)

• HV System will not reboot

• Working on problem now

• Additional Fastbus crate/modules are ordered

• Report on R (E94-110), (Thia Keppel)

• Showed results of previous Jlab experiments based on quark hadron duality

• Assuming duality, R seems related to G_E/G_M too
• Issue will be revisited with upcoming experiment

• Luminosity Scan (Chris Armstrong)

• Showed results with slow spiral fast raster
• With ¹H target strong indication of boiling in upstream section of target
• Possibly related to flow in target

• Optical Transition Radiation Monitor(OTR)

• Showed data from commissioning
• First test results showed good dispersion in ARC, second result shows

• Need to fix beam tune before further target boiling tests
• Discussion of relevance for future experiments
• Discussion of how this is integrated in the data stream

• G0 (Allison Lung)

• Diagram of what G0 will look like
• Showed overview of various components and responsibilities
• Showed changes of management structure
• First coil test this week
• Early June final coil test
• By fall, curved scintillators will be ready for testing
• G0 Review went fairly well

Dates for Future Readiness Reviews (Roger Carlini)

• HNSS – July 29
• Gen (E93-038)– August 12
• Gen (E93-026)– (undetermined)

• Gave a list of names of potential new Staff Scientist
• Applications will be handed out this week to staff members