Log entry time 17:52:21 on September 13, 2009

Entry number 289369

Run Plan

1. Take 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).
2. Take Compton data. Alexandre will start looking at the electron detector signals. People will also take a look at the Compton data from this morning, where we had both photon and electron data.
3. Change the half-wave plate state when we get to 1M good pairs. Follow the instructions for doing this and running the flipper script here: http://hallaweb.jlab.org/experiment/HAPPEX/opmanual/opmanual.html#ChangingHalfWavePlate
4. Run spot++ every couple of hours and log it. Change the prescale factor PS8 to 1 and PS1 and 2 to 99999.
5. We will be running on 80 muA until 6:00pm, when MCC will take the beam away to do beam checks and get us back to 100 muA. If they are unable to get to 100 muA without tons of beam trips, we will run on 80 muA until the morning as long as it is stable.
6. Beam Time Accounting: accept the beam unless the Compton people say that they just cannot use it. Then record it as BNA.

Concerns

• 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 th beam time accounting.
• 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.
• Please make sure that the shift checklist is done once each shift.
• The Flipper script didn't work the last time we did a half-wave plate change, and so things had to be done by hand. This needs to be fixed.
• A WAC schedule needs to be created and posted so that I know who is doing this.
• Beam Time Accounting: take off 1 minute per beam trip, since the BTA code doesn't.
• The dithering looks non-invertible. Someone should look at this.
• There is a constant alarm due to unused VDCs. This alarm should be removed so that people don't become desensitized to the alarm handler.