Log entry time 19:09:03 on July 24, 2005

Entry number 149309

 E00-114 Run Plan July 23

Jul 23, 19:00, Rob Feuerbach, Run Coordinator (pager 584-7254)

Goto HAPPEX How To Page

Program: 

1. Counting Mode: Sieve in septum-scan data collection
2. Counting Mode: Sieve out HRS-p0 scan (+/- 5MeV)
3. HAPPEX DAQ: Find maximum beam current for septum excitations of +10%, +20%
4. Production Mode at 'optimal' settings

Nominal and Production settings

• 35 microamps (or highest possible with T_septum<7.75K), raster 7x7mm² (5x5 seen by spot++), BPMB (x,y) = (-1.4,0) +/- 0.2, BPMA (x,y) = (1.6,0) +/- 0.2
• Target: ⁴He, fan speed = 60Hz
• Sweeper ON at 111A
•  Left p0 = 2.736 GeV/c
• Right p0 = 2.732 GeV/c
• Spectrometer detectors OFF
• HV on Lumi and HAPPEx detectors should read at ~45k channels. Record any changes in HV
• Keep septum coil temperatures below 7.75K!

Run Plan: directed by Experts (page them if not present)

1. Switch to the Spectrometer DAQ, printing out and marking off the transition checklist. Please DATE the checklist.
2. Sieve in septum-scan data collection (Moffit/Michaels/Feuerbach)
   The purpose of the study is to check the angular acceptance and optics for septum excitations above the nominal setting. With the sieve inserted and the HRS momentum at their nominal settings, take 500k event runs at septum-current settings at +0%, +10%, and +20% above nominal for that P0. Do NOT change any settings until AFTER the End-Of-Run is complete. Record the run numbers and septum currents used. Point-targets are used to be able to distinguish the sieve holes. Keep the raster ON. Adjust prescale factors to collect equal numbers of T1, T2, T3, T4, and T7, T8. The settings are:
   1. +0%, Single C12 foil
   2. +0%, 24cm (+/-12cm) Optics target
   3. +10%, 24cm (+/-12cm) Optics target
   4. +10%, Single C12 foil
   5. +20%, Single C12 foil
   6. +20%, 24cm (+/-12cm) Optics target
3. Make an access to rotate the sieves out of the way.
4. HRS-P0 scan (Moffit)
   Using the Helium target, for each septum excitation take data at HRS P0 settings of -5 MeV, +0 MeV, +5 MeV (or as dictated by the expert) relative to the nominal momentum setting. This will be used to fine-tune the alignment of the elastic peak on the HAPPEX detector. Do NOT change any settings until AFTER the End-Of-Run is complete.
5. Switch to HAPPEX DAQ, following and marking off the transition checklist. When finished, put the checklist in the back of the Shift Checklist binder.
6. Maximum beam current and detector widths vs septum excitations (Paschke)
   We need to determine the maximum operating beam current for each septum excitation configuration, including the optimum HRS-p0's determined in the HRS-P0 scan. For each configuration, take a separate HAPPEX run at 35uA and the maximum operating beam current, to determine the best detector widths at a reference and at the best operating point. Target operator: watch the HPH to make certain we will have headroom at the highest beam current.
7. If an improved operating point is determined by the experts, it will be the new "Production setting". Record it on the White Board and in the Halog.
8. Begin taking Production Data.

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

• Every 8 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 cannot solve within 30 min page the Run-Coordinator.
• During night and weekend shifts 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