Log entry time 17:03:02 on October 16, 2009

Entry number 295250

Run Plan (Please HALOG it if you find something strange or wrong; Call RC if the problem is not resolved within 10 minutes)

1. Take production data at 98 uA! 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! You will need to start a new Compton run every two hours. The CODA screen to start and stop the Compton runs is in
   the front room on the computer (adaql3) between the shift leader and target operator computers.
   • If compton experts are in back room to do some tests, follow their plan.
   • If the background rates get too high, the Compton HV will trip off and you won't be able to take data. If you cannot keep it going, page Megan Friend (584-0038).
   
   
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. Make sure the prescale factors are PS8 = 1 and PS1 = PS2 = 99999.


5. Beam Time Accounting:
• Accept the beam unless the Compton people say that they just cannot use it. Then record it as BNA.
• Subtract 1 minute from the ABU after beam trips for 100uA production running.


6. If beam is down for a while, follow Bob's instructions to reset the Counting House crate (ROC 23),
   http://www.jlab.org/~adaq/halog/html/0910_archive/091016160713.html.
   
   

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   Concerns

   • The target has been suffering cooling power issues recently:
     • Please make sure the high power heater isn't fixed at zero Watts with high current.
     • This can lead to large target temperature fluctuations when the beam trips.
   • Make sure that BPM12 is not saturating.
     If it does, follow the steps on the HAPPEX Troubleshooting (http://hallaweb.jlab.org/experiment/HAPPEX/troubleshooting.html).
   • If anyone must reset a magnet, they must make a halog entry stating which magnet on which arm, and what was wrong with it to require a reset. The word "tech" must appear in the subject line.
   • Be sure that the prompt analysis is done for every run!
   • 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 the beam time accounting.
   • Please write a detailed shift summary (including runs taken and any activities) and submit the BTA for each shift.
   • Please make sure that the shift checklist is done once each shift.
   • If you have to page or call someone for support, please do so from a counting house phone or it will be ignored!
   • Keep a close eye on the lumi and detector asymmetry 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.