Run Coordination Meetings: Spring 2016 Run/TOF plan

TOF HV scan should be done later in the run, not when the beam is restored. The goal  of the HV scan is to measure TOF efficiency and to find the lowest HV setting at which we are still reliably close to 100% eff. and, at the same time, extend the PMT longevity by running at the lowest acceptable HV.

Now, to determine TOF efficiency we need to have good working track reconstruction. Which means that the drift chambers should be in their optimal state and, preferably, their calibration should be done already.

Required time: 6 back-to back runs with a stable beam and tracking: 1) TOF HV at their current nominal  values 2) +25V for all HV; 3) -25V 4) -50V 5) -75V 6) -100V

1 million events per run should give us enough coverage over the TOF face. If the DAQ rate is about 1kHz then each run should take about 20 minutes. Together with delays to change HV and start a new run the study should  be done in 2,5-3 hours of beam time. Also, if we are in the production mode, most of these runs should still be acceptable for production except for the last ones where we may start seeing a drop in the efficiencies.