PrimEx Run Plan for June 2002 beam test

PrimEx Run Plan for June 2002 beam test

Here is the run plan for the June 2002 PrimEx beam test. The tests will measure three different systems, luminosity monitoring, calorimeter prototype, and gain monitoring. This run plan tries to merge as much as possible the desired tests.

The format is to follow two main paths. They are for luminosity monitoring and the HYCAL-0 prototpe (the gain monitoring system is included in the HYCAL-0 tests). The table below shows the main beam configurations and the tests which will be performed at each. Click on the links to jump to the detailed run plan for that test.

Tagger Radiators Pair Convertors
(superharp ladder)		 PrimEx targets
A: 3 x 10-4
B: 1 x 10-4
C: 2 x 10-5
D: 2 x 10-5		 1 x 10-2
1 x 10-3
1 x 10-4		 5 x 10-2
1.9 x 10-2
1.1 x 10-3
1.1 x 10-4

Est. Time Luminosity HYCAL-0
26 hrs. Run Conditions:
Ie 10pA
Tagger Radiator 2 x 10-5 r.l.
Pair Converter 5% r.l. C
Dipole Current 1850A
Trigger MOR19
Plateau Gain Match
Calibration
-
6 hrs. Run Conditions:
Ie 50nA
Tagger Radiator 3 x 10-4 r.l.
Pair Converter 5% r.l. C
Dipole Current Optimal from scan (1850A?)
Trigger MOR19, MORprescaled
Beam Scan
-
3 hrs. Run Conditions:
Ie 50nA
Tagger Radiator 3 x 10-4 r.l.
Pair Converter 5% r.l. C
Dipole Current MAX(2500A?) to ??
Trigger MOR
Dipole scan
-
20 hrs. Run Conditions:
Ie 10pA-100nA
Tagger Radiator 1 x 10-4
Pair Converter 5%, 0.1% r.l.
Dipole Current Optimal from scan (1850A?)
Trigger MOR19, MORprescaled
Rate/ADC tests Rate tests
Transition Points
Gain Monitoring System
Plateau

All pair spectrometer paddles must be plateaued. This is to be done simultaneously while gain matching and taking calibration data on the calorimeter. The beam current will be small due to limitations of the calorimeter.

  1. Plateau all 32 counters simultaneously using individual scalers. Voltages should be varied from -900V to -1700V.

    Use the automated program /home/primex/pairspectrometer/plateau. You must run it as clasrun on clon01. Run it from the directory /home/clasrun/pairspectrometer and make sure the directory "data" exists there. Also note that the program will create the output files if they exist, but will append data to existing files. If you need to rerun the plateauing program, move the old files in the data directory out of the way.

    command is: /home/primex/pairspectrometer/plateau -u 1700 -l 900 -s 15 -a -n 3

    (run /home/primex/pairspectrometer/plateau -h for a usage statement)

  2. Plateau the front counters requiring a coincidence with the back.

  3. Set all PS High Voltages to appropriate values determined by plateau curves.

  4. Record all PS HV values in logbook and in text file /home/primex/pairspectrometer/ps_hv_values_june_2002.txt
Pair Spectrometer Beam Scans
  1. Center calorimeter on beam.
  2. Remove radiator, insert 5% PrimEx target
  3. Have MCC move beam +/-2mm in X in 0.5 mm steps at 2C21. Take data for ~ 5min. at each step.
  4. Insert 1 x 10-4 radiator
  5. Repeat step 3.
  6. Have MCC center beam back at nominal position and set beam current to
HYCAL-0 Gain Matching

Each detector in the calorimeter must have its high voltaged adjusted so as to match the gain with the other detectors. All detectors should be gain matched to within 10% of each other.

  1. Make sure beam is off.
  2. Insert the 2 x 10-5r.l. Radiator.
  3. Insert the 5% r.l. Sn primex target.
  4. Make sure superharp is in blank position.
  5. Have MCC set beam current to approximately 10pA
  6. Set all PbWO4 voltages to 1100V?
  7. Set all Pb-Glass voltages to 1600V?
  8. Use trigger file TS_gainmatch.cfg (this should enable only the MOR19 and PS trigger bits)
  9. Adjust HV for each PbWO4 detector to align its ADC spectrum to some central value (e.g. 5500 ADC counts).
  10. Adjust HV for each Pb-Glass detector to align its ADC spectrum to some central value (e.g. 5500 ADC counts).
  11. Record voltages electronically and place copy in logbook.
HYCAL-0 Calibration

  1. Verify the beam settings are as set in gainmatching.
  2. Use trigger file TS_calibration.cfg
  3. Center each detector in the calorimeter on the beam and take ~100K events.
Dipole Scan

  1. Turn the beam off and insert the 5 x 10-3radiator
  2. Verify that a 5% r.l. pair convertor is in.
  3. Use trigger file TS_dipolescan.cfg
  4. De-Gauss the dipole magnet and set the current to 0A
  5. Increase the dipole current in 100A increments. Record the HYCAL-0 rate at each point. Stop when the rate drops to a factor of 10 less than the maximum.
  6. Ramp the dipole up to 1450A
  7. Take data for 10 minutes at each of the following dipole settings:

    1450A
    1650A
    1850A
    2050A
    2250A

  8. Determine the current corresponding to the maximum PS rate as determined by the above scan.
  9. Set dipole current to optimal value as determined by scan in steps 7 and 8.
HYCAL-0 Rate tests, and Transition Points

Luminosity Rate tests and PS ADC tests

Take data at each of the setting listed below for the specified times. PS ADC data should be taken simultaneously using the CLAS DAQ system. Use the 1 x 10-4 tagger radiator for all runs.

Convertor Rates on MOR Tagged Rates/E-cntr counts/E-cntr run Time Hycal-0
X pos.		 Hycal-0
Y pos.		 Comments
5 x 10-2 50 MHz 2 kHz 10,000 15 min. center center -
5 x 10-2 20 MHz 800 Hz 10,000 15 min. center center -
5 x 10-2 1 MHz 40 Hz 10,000 15 min. center center -
5 x 10-2 300 kHz 12 Hz 10,000 15 min. center center -
5 x 10-2 150 kHz 6 Hz 10,000 1/2 hr. - - TAC IN
5 x 10-2 75 kHz 3 Hz 10,000 1 hr. - - TAC IN
5 x 10-2 50 kHz 2 Hz 10,000 1.5 hr. - - TAC IN
-
1 x 10-3 50 MHz 40 Hz 10,000 15 min. center center -
1 x 10-3 20 MHz 16 Hz 10,000 15 min. center center -
1 x 10-3 1 MHz 0.8 Hz 10,000 15 min. center center -
1 x 10-3 300 kHz 0.24 Hz 10,000 15 min. center center -
1 x 10-3 150 kHz 0.012 Hz 10,000 1/2 hr. - - TAC IN
1 x 10-3 150 kHz 0.012 Hz 10,000 1/2 hr. transition point 1 transition point 1 -
1 x 10-3 150 kHz 0.012 Hz 10,000 1/2 hr. transition point 2 transition point 2 -
1 x 10-3 150 kHz 0.012 Hz 10,000 1/2 hr. transition point 3 transition point 3 -
-
1 x 10-4 50 MHz 4 Hz 10,000 1/2 hour - - TAC IN
1 x 10-4 30 MHz 2.4 Hz 10,000 1/2 hour - - TAC IN
1 x 10-4 20 MHz 1.6 Hz 10,000 1/2 hour - - TAC IN
-
5 x 10-2 30 MHz 1.2 kHz 10,000 15 min. center center -
5 x 10-2 10 MHz 400 Hz 10,000 15 min. center center -
1 x 10-3 30 MHz 24 Hz 10,000 15 min. center center -
1 x 10-3 10 MHz 80 Hz 10,000 15 min. center center -

David Lawrence
davidl@jlab.org
Sun Jun 23 18:40:03 EDT 2002