Significant News

• Joachim Kuhn takes over as Run Coordinator as of Monday 7:00 AM.
• IHWP still IN.
• Potentially odd Hall B bleed through effect observed at around 5:45. Beam to Hall C off, yet BPM's reading finite values. MCC closes Hall B slits, and readings go away.
• During the early morning hours (~5:00), beam steering and tuning problems get severe. Energy instabilities again. The instabilities are so bad that MCC can't deliver more than 36 uA to the hall without very frequent Hall C Ion Chamber induced beam trips. Target operator sees temperature in our tungsten radiator spike, indicating the beam is actually hitting the radiator. Analysis shows that helicity correlated energy differences during this beam period are ~ 600 eV, while our spec is 75 eV. Things are bad. This MUST be fixed during the maintenance.
• Lumi 7 still not working properly. Still not clear what the cause is, but some ideas should be floated around, and next Monday's maintainance day would be a good opportunity to implement them.
• DMCH Interface box is the  "new" box, and 120 Hz mode still does not work for French electronics. A new procedure for 120 Hz running will be to set acquisition mode to TS_Scaler rather than TS2_full.
• Analysis and  worker shift personnel seeing many crashes in cdaql1. Paul has requested that these positions generate a shiftly log of how oftern and when these crashes occur. These do not have to be log entries the moment the crash occurs, but at the end of your shift, make one log entry which summarizes the crashes.
• A Damon analysis for all of the data since the change to 4 pass running shows that the BCM monitors in the hall are showing charge asymmetries that are not zero at about the 3 sigma level. We should resurrect the Injector DAQ and measure the charge asymmetries there during the same time as we are running in the hall to see if the same effect is present in the injector, or these are caused by some differential scraping down stream of the injector entrance to the accelerator. (Volunteers?) However, due to the Hall A turn on, if Hall A beam is being delivered, the charge asymmetry in the injector is a combination of both Hall A and Hall C charge asymmetries. This may only be useful for us if Hall A has no beam delivered to them.
• We will be down for all day Monday, and through Day shift on Tuesday. This means that worker and leader shifts will not need to be manned from 8:00 Monday through 16:00 Tuesday. We will need one target expert on Monday morning to boil away the target and put it in a safe state at 30 K. When to fill the target again (either Tuesday Swing  or Wednesday morning) will be determined by the promise of beam and when we can expect it back in the hall. This decision will be made Tuesday afternoon. We will also need a SMS expert on Monday morning to ramp down the magnet and put it in a safe state for the shutdown.

Plans

Concerns

• Spikes in French electronics
• Non-statistical widths in detectors 13 and 14 of octants 4 and 8.
• Non-understood influence of Interface Box to DMCH's. Spare does not work in 120 Hz mode.
• NA LTD errors still occurring at a smaller 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.
• Crosstalk with target IOC and target FSD box when the Musson box is rebooted remotely
• Changed behavior of BPM 3H00C Y position with respect to other hall BPMs.
• Lumi 7 issues.
• cdaql1 also crashing at a pretty regular rate.
• ENERGY INSTABILITIES IN BEAM.