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User name V. Sulkosky
Log entry time 14:29:36 on October 12, 2009
Entry number 294575
This entry is a followup to: 294392
keyword=Run Coordinator summary (Oct. 11)
RC report (Oct. 11 Owl shift ~ Oct. 11 Swing shift)
Sunday, Oct. 11
- 00:25 Resume 100 uA production without Compton.
- 00:30 Work on Compton rates ceases for the night.
- 01:22 Low current Compton tests by closing the slit.
- 02:10 Resume 100 uA production still without Compton.
- 04:00-04:36 Beam off for MCC to check pathlengths.
- 04:36 Beam resumes but is very trippy.
- 06:28 Beam off for injector work due to Hall B problems.
- 07:10 Beam back at 100 uA.
- 07:40 Compton running but S/N ratio is 1.3 with background
around 1 kHz/uA.
- 08:23-09:16 Beam off due to adjusting separation for Hall B line.
- 09:45-13:15 Moller tuning and measurement: 88.9%.
- Resume 100 uA running, but beam is frequently tripping until 14:40.
- After resuming beam, the Compton rates are worse and HV trips at
- During 17:00 and 19:00, there are periods with many beam trips.
- Around 19:14, Compton rates improve, but are still high 1.0
- 22:00 MCC finds Compton rates are correlated with adjustments for
the A1 and A2 Interceptions.
- 23:30 Beam off due to IOCHLA needing to be rebooted in Hall A.
Coulombs So Far
- We are currently on slug # 22 (IHWP IN)
- Coulombs taken in all so far: 119.8 C as of Sunday 9:00 am.
- Compton rates are high, which prevents us from taking useful
- Please always check online hists and compare them to the
- If you find something strange or wrong, please HALOG it so
that the expert can check it.
- Target Operator, please always check target PID system and
strip plots to make sure all the systems work.
The cryo flow rate around 25.2g/s and JT value is around
55.5 since this is better for Lumi widths.
The flow rate and JT value setting are sensitive to the outside
temperature. Hence the
settings may change from morning to evening.
Please be patient when you adjust the JT value since it
may take a few minutes to make the cryo flow rate stable.