Run Coordinator's Report for September 16 Swing to September 17 Day

Summary

The swing shift started off with no beam, but late in the shift MCC tuned up and began delivering beautiful beam, and we took lots of data throughout the night and the morning. We did a Moller measurement in the afternoon, and then went back to production running.

Significant News

Last night's swing shift started with no beam (accelerator had taken it for beam loss investigations), and with the right Q2 recovering from a quench. After beam was returned at 19:45, attempts were made to tune it unsuccessfully to lower Compton rates. After discussion, the beam was retuned to get a larger spot size. At about 23:30, production running began in earnest, and great data were taken (both production and Compton) throughout the night.
The beam quality improved immensely last night around 23:00, for both our production running and the Compton. It was found that a pulser (1 kHz) had been on and had been forgotten after the downtime on Tuesday, which was turned off around 23:00 as well. Even so, the background rates with the new tune are so much better than they have been that the Compton is taking lots of great data, which we had been unable to do before.
Production data were taken in the morning until the Moller measurement at noon.
A Moller measurement was done this afternoon. See halog entry 290141.
After the polarization measurement, we went back to production running, with the plan to continue taking data throughout the night.

Plans

The detailed run plan for the night is in halog 290172.
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

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).
Q2 quenched yesterday, and Ed asked that we keep a close eye on it.
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.
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).

Coulombs So Far

Coulombs taken in this time period: 5.3 C
Coulombs taken in all so far: 44.0 C as of 12:04pm

Shift Summaries and BTA Reports

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