Run Coordinator report: Spring 2018 r4

Here is a brief summary of the progress over the last week (Jan 31 - Feb 7) while I was Run Coordinator. During this time CW beam was available to Hall D for 91.6 hours (of the 168 hours possible), and of that time we used 85.9 hours (or 94% of the available beam). Over the past week we collected ~12 billion triggers, bringing the total to ~40 billion for the Spring 2018 run. From analysis of the rho beam asymmetry, we’ve also confirmed that the polarization this year is consistent with what we observed last year.

During the past week the Accelerator’s focus was on delivering full energy, high current beam to Hall A and C, which at times resulted in beam losses and on Monday (Feb 5) an Accelerator access was taken to try and identify the location of the loss. We took this opportunity to access Hall D and perform several tasks including: FCAL maintenance, Muon chamber re-installation, TAGM maintenance and investigation of a CDC pressure drop.

Some special tasks performed last week include:

• Production TAC run using the V-wire radiator at 30 nA current. Although there were some issues with beam stability, an analysis of the preliminary PS acceptance looks promising. An additional TAC run will be needed later in the Run Period after some discussion of the optimal conditions.
• Tests of a minimum bias (ST+TAGH) trigger to be used in low-luminosity runs for trigger evaluation
• High current (300 nA) testing of the DAQ