RC report for Apr13 to Apr15

Log entry time 20:59:27 on April 15, 2004

Entry number 82228

keyword=RC report for Apr13 to Apr15

Run Coordinator's Report for 13 April Swing to 15 April Swing

Summary

Target empty and in out-of-beam position and magnet ramped down during MCC compatibility studies. Restored beam delivery to the hall during day and swing shift April 15.

Significant News

MCC performed compatibility studies for simultaneous beam delivery to all Halls.
Hall C open for cleanup during dayshift April 14. All shifts were cancelled until noon April 15
Beam was announced for noon and started at 1pm on Thursday April 15.
Verified beam positions, turned Moller magnets on and Kaz checked beam quality. In the meantime Hall A finished cooling their target so we started cooling down ours and ramping up magnet.
Moller measurements while waiting for magnet and target: P = 74%. Check log-entry number 82206 by Dave Gaskell
Dave also determined that we have very small leakage from Halls A and B. Check Log-entry number 82207 for details.
New DMCH box works fine in 120Hz mode. We will have to test the box on a longer term with production data for a complete evaluation. For now we woill run with this box.
Starting to take production data on LH2

Short term Plans

Beam energy measurement of the beam into Hall C (Mark Jones).
Opportunistic half-hour access to the Hall to change a base (Julie). Let RC know if you need an access to the Hall as well.
Moller/IHWP insertion/Moller every three days. This will put us on schedule to take another Moller on Sunday, but we may wait until after the CD-0 tour on Monday for the next one.
Continue with LH2 production running.

Longer term Plans

Deadtime study at 20, 30, 40 uA (three 1hr runs at Angela's request)
PMT gain calibration at 1uA (6hrs at Julie's request)
Continue with LH2 production running until Monday when the accelerator shuts down again for the CD-0/DOE tour.

Concerns

HV for Detector 4-15-FL HV won't stay on. See log-entry number 82215 for details.
Spikes in French electronics
Non-statistical widths in detectors 13 and 14 of octants 4 and 8.
NA LTD errors still occurring at a small rate. Brian has generated a "HowTo" document (located on the G0 web page under http://g0web.jlab.org/manual/Electronics_manuals.html) for trouble shooting.

User name J Kuhn