Log entry time 16:55:51 on March 11, 2012

Entry number 365730

This entry is a followup to: 365512

Followups:

• 366045 03/12/12 21:56 brads GEp/G2p status update -- Monday

The target generally been doing pretty well. Polarization has been around 60% for much of the data taking last night -- it was a bit of a struggle to keep it at that level during mid-OWL so we made the call to just drop the beam current to 50nA. We were worried that the various locks and other beam monitoring hardware would have problems below 100nA, but things seem to be fine. The target has continued to experience occasional "current anomalies". There is a procedure to manage these events, but the TO needs to keep a sharp eye on things. The frequency of these events seems to have dropped considerably since we moved to 50nA beam vs 100nA beam. That suggests we should consider some shielding improvements around the relevant controller hardware on Tuesday.

The target group took a controlled access to anneal at 9am this morning. We were back on the air a little after 11am with a very high (>80%) polarization. I'm not sure I believe that myself, but some call me cynical :-) Regardless, so far, so good.

Based on the present data rate and a rough online analysis, Doug and Moshe estimate they should hit their statistical goal by mid day shift on Monday. At that point we will continue with the Optics program and BCM calibrations. The Optics data will require us to switch to "straight through" mode, so we should be sure to do this before the end of Day shift (if at all possible) so Yves is available at MCC.

We are still on schedule for the chicane move starting Tuesday morning.

Issues to watch for (these are also on the whiteboard):

• Shift staffing is a still a real problem! There are many vacancies that must be filled ASAP. Come on folks, step up and sign up!
• Beam leakage from Hall C is well under control now. We need to be vigilant and make sure that Hall A Laser slit is set to 14 for our production running. The shift crew are requested to ask MCC for a bleedthrough check every 4--5 hours just to be safe.
• The IHWP will be flipped at Hall C's request every 4 hours. Hall C and/or MCC should inform us when this happens so we can log the change and stop/start our runs. Hall C would like to shorten this flip interval in the future -- we'll negotiate this on Monday.
• The target magnet current spontaneously drops by ~0.5A occasionally (look in Halog for "Target Current" entries). The Target operator needs to watch for these and know how to correct the issue -- ask the TO how to do this when you come on shift if you don't already know.

• Finish optics data taking. This is a G2p priority -- we will get back to this Monday day shift.
• HARP 1H05A still isn't working.
• Complete BCM/Tungsten Calorimeter calibration.
• The RC requests a run-plan from the Optics folks (Jixie), and BCM/BPM folks (Alex) that lays out what needs to be done in modest detail, along with how long each step will take.
• Hall B will be requesting a move to 5-pass mid-week (Wed/Thursday?). This is likely to take considerably longer than the typical 4 hours since they have not been in that configuration for some time. This will be invasive to all Halls.
• Add shielding to Target controller on Tuesday?