Run Coordinator's Report for September 17 Swing to September 18 Day

Summary

We took production data and Compton data throughout this period. A position scan was also done during the owl shift to investigate whether we are hitting the aluminum and causing target boiling.

Significant News

Last night's swing shift started with us switching back to production running from the Moller measurement that ended at the end of the previous shift. The beam was tuned, the spot size verified as okay with harp scans, the raster was verified, and production running began. The shift took production data throughout the night, with the only snag being a reboot of the target ioc. After reaching 1M good pairs, the half-wave plate was changed, but flipped did not work, so the values had to be put in by hand (halog entry 290216).
The scaler is fixed (maybe!). See halog entry 290177.
A beam position scan was done during the owl shift to see if we are hitting the aluminum and causing target boiling that way. See halog entry 290295 and halog entry 290297.
After the scan, we went back to production running throughout the rest of the owl and day shifts. There was some time lost to CODA reboots and IOC reboots (by MCC and our target IOC).

Plans

The detailed run plan for the night is in halog 290400.
Take lots of production data! Watch the lumi widths to see if anything changes. Please check the histograms on the online data monitor with the reference ones on the shift how-to page (http://hallaweb.jlab.org/experiment/HAPPEX/opmanual/opmanual.html#HPXStartingonlineanalysis).
Run spot++ every couple of hours and log it. Change the prescale factor PS8 to 1 and PS1 and 2 to 99999.
Take Compton data, starting a new run every two hours. Call the Compton experts if the background rates get so high that they consistently trip off the Compton detector HV.
After an extended period when the beam is down, establish good beam (do harps, spot++, check raster), then go to production running.

Concerns

Flipper needs to be fixed!
Scot Spiegel would like to make an access if we are going to be down for a while at a time when we can go to controlled access (in the daytime, 8am-5pm) to get some poly for shielding. If such a time presents itself, his extension is x5900, his cell is 757-536-5900, and his pager is 757-584-5900.
Page Heidi if there is an access in the daytime (6915).
If anyone must reset a magnet, they must make a halog entry stating which magnet on which arm, and what was wrong with it to require a reset. The word "tech" must appear in the subject line.
Be sure that the prompt analysis is done for every run!
Please log CODA reboots in the halog and shift summary so that it is easier to track how much time is lost to these reboots.
The BTA program doesn't subtract any time to speak of for beam trips. Please manually subtract a full minute for each beam trip in the beam time accounting.
Please write a detailed shift summary (including runs taken and any activities) and submit the BTA for each shift.
Please make sure that the shift checklist is done once each shift.
If you have to page or call someone for support, please do so from a counting house phone or it will be ignored!
Keep a close eye on the lumi widths as we take data.
Please continue to take runs even if there is no beam. These data can be used to determine pedestals. Please label these runs as having no beam.
The PVDIS people would like their scintillators on. See halog entry 290362.
There are lots of empty shifts that need to be filled immediately! Please sign up!
Is bpm12 still saturating?
Hall C charge asymmetry feedback.
The dithering looks non-invertible. Someone should look at this.
We need to do position scans to make sure that we are not hitting the aluminum.
The electronics pickup data needs to be looked at carefully (pedestals and Pockels cell off data).
MCC has advised us to tell them when we want a Moller measurement before we take our target out so that they can do their all save and everything with things as they are.

Coulombs So Far

Coulombs taken in this time period: 6.7 C
Coulombs taken in all so far: 50.7 C as of 14:14pm

Shift Summaries and BTA Reports

Thursday Swing: Summary and BTA
Friday Owl: Summary and BTA
Friday Day: Summary and BTA