Log entry time 20:19:45 on July 26, 2005

Entry number 149563

E00-114 Run Plan July 26

Goto HAPPEX How To Page

Jul 26, 9:00, Rob Feuerbach, Run Coordinator (pager 584-7254)

Remember to read the White Board

Program: 

1. Establish beam
2. Production running at the +10% septum-excitation setting (page R.C. after run is started)

Nominal and Production settings

• HRS momentum/magnet settings:

  	L-HRS	R-HRS
  P0	2.737	2.733	GeV/c
  Septum I	283.57	278.11	A (set current)

• 38 microamps (or highest possible with T_septum~7.64K)
• Raster request 14x14, which is about 7x7mm² (5x5 seen by spot++)
• Beam position:

  	X (mm)	Y (mm)
  BPMA	1.6	0.0	+/- 0.2. Less important
  BPMB	-1.4	0.0	+/- 0.2. IMPORTANT

• Target: ⁴He, Fan Speed = 60Hz
• Sweeper ON at 111A
• Spectrometer detectors OFF
• Charge asymmetry feedback: On the RunBird GUI the Hall-A and Hall-C IA should be ON.
• Beam Modulation: On Green Monster GUI: Beam modulation should be ON.
• The Lumi and HAPPEx detectors should readout at ~45k channels (check display in panguin); the high voltage (HV) can be adjusted to keep them in this region. See the HowTo. . Record any changes in HV
• Keep septum coil temperatures below 7.67K!

Establishing beam for the Helium target

1. Before beam is permitted back into the hall after an extended down (more than 2hrs) or the beam tune has been changed, the target should be in the Empty position.
2. If it is a new tune, take a HARP SCAN with an unrastered beam to check the intrinsic spot size.
3. Verify the raster size by taking a pulser run with the spectrometer DAQ, with the prescale factors ps7 and ps8 set to 1 and running spot++. The actual size of the rastered beam spot is 1.5* the image dimensions in spot++. Iterate with MCC until the raster size is correct.
4. Insert the Helium target, and ask for beam starting at a maximum current of 10uA and ramp up (over a minute) to the operating current while the target operator watches the HPH and CHL 4K He flow.

Data-taking Tasks

• Every HAPPEX-DAQ run
  1. Watch output of panguin to monitor data from current run.
  2. Analyze the run. As apar:

     gopan; prompt.pl
       runnumber

     
     Compare the results with the reference plots.
• Check the Compton DAQ (at least every 2 hours) Instructions for the simple "normal" running and fixes are listed next to the computer
• Every 12 hours of production dataChange the status of the half-wave plate.
• Two times a day (when Profiler/Scanner expert is on shift) take a profile run (10min).

General Tasks:

• HALOG any detector, DAQ trip and unusual observation when they happen.
• Do shift checklist.
• Once a shift HALOG control screens and septum strip charts.
• Any problem that prevents data taking and that you do not know how to solve, or have not solved within 20 min page the Run-Coordinator.
• Contact the Run-Coordinator before the Tech on-call. Any problems that are not emergencies, please make a HALOG entry with "TECH" in the keyword.

Please log below (and in the HALOG) any unusual observations and problems solved

Date/Time	Name	Comment	HALOG