CPP Test 2020 - Schedule

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Revision as of 16:24, 28 August 2020 by Elton (Talk | contribs) (Data taking (standard GlueX))

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Detector configurations

Nominal GlueX configuration

  • No Pb shielding
  • DIRC installed
  • Solenoid field at 1350 A
  • Radiator Diamond JD70-105 47 um, Peak at 6 GeV

CPP Test Configuration

  • With and without Pb shielding
  • DIRC removed
  • Solenoid field at 1350 A (no change)
  • Radiator Diamond JD70-105 47 um, Peak at 6 GeV

Data taking (standard GlueX)

  • daq_run: PHYSICS_DIRC
  • daq_setup: hd_all.tsg_DIRC_CC_HL
  • daq_config: FCAL_BCAL_PS_m9.conf
  • Use Random Trigger GUI to set the random trigger rate to 30 kHz.
  • Install desired target/lead sheet configuration
  • Ask MCC to deliver beam at 20 nA.
  • Start run.
    • Take data for 5-10 min of stable beam.
    • Ask MCC to deliver 40 nA. Continue with same run for 5-10 min of stable beam.
    • Ask MCC to deliver 30 nA. Continue with same run for 5-10 min of stable beam.
    • Ask MCC to deliver 10 nA. Continue with same run for 5-10 min of stable beam.
    • End run.
  • Go to next target/lead sheet configuration

Lead sheets

  • Shielding (from log entry 3656916)
    • We have used two sheets of shielding.
    • Each sheet consists of 2 sheets of Pb sandwiched between two layers of Al.
    • The thickness of Pb is 4.5-4.6 mm (0.80-0.84 rad len)
    • The thickness of Al is 2x1.6 mm = 3.2 mm (0.04 rad len)
    • Total radiation lengths is 0.86 +/- 0.02 radiation lenghts per sheet.
  • Sheets are 60cm x 60cm with a 18cm x 18cm beam hole. These sheets are the same as used in CPP Beam Test Feb. 2019 but with an enlarged opening for the beam.

Checks during the run

  1. TOF scaler rates
  2. EPICS beam current. If possible check that it is being recorded onto tape

Test layout

Screenshots of test layout media:CPP_Testconfig.jpg  media:CPP_Testconfig2.jpg
media:CPP_Testconfig3.jpg  media:CPP_Testconfig4.jpg 
media:CPP_Testconfig5.jpg  media:CPP_Testconfig6.jpg

The HDList for this activity can be found at [1] (accessible only internally to JLab)

Test sequence

Possible test schedule by Tim Media:CPP_Tests_Aug2020.pdf

Total estimated time for test including installation, data taking and reinstallation of GlueX is 34 hours.

CPP Preliminary baseline measurements

These will be conducted by Ilya during Sat Aug 29 4am-10am shift. This will be conducted with the nominal GlueX configuration prior to test proper.

  1. CPP test DAQ setup: 2 hrs
  2. Set coherent peak to 6 GeV
  3. Data GlueX configuration - Full Target/DIRC (repeat from Dec 2019): 2 hrs
  4. Empty target : 1 hr
  5. Data GlueX configuration - Empty Target/DIRC : 1 hr
  6. Restore coherent peak to 8.6 GeV

Installation/setup of CPP Test: Day Mon Aug 31

  1. Pass change for Hall A/C.
  2. Hall D in restricted access starting at 6 am
  3. Configure experiment for CPP Test: 12 hr. Mark Stevens and staff.
  4. Training for Pb sheet install/removal to CPP personnel after changing configurations

CPP Test. Mon evening Aug 31 - Tue morning Sep 1

  1. Full Target :
  2. Install 0 Pb sheet: 1 hr
  3. Data CPP Test configuration- Full Target/no DIRC/1Pb : 1 hr
  4. Install 1 Pb sheet: 1 hr
  5. Data CPP Test Configuration - Full Target/no DIRC/ 0Pb : 1 hr
  6. Install 2 Pb sheets: 1 hr
  7. Data CPP Test Configuration - Full Target/no DIRC/2Pb : 1 hr
  8. Empty Target :
  9. Install 0 Pb sheet: 1 hr
  10. Data CPP Test configuration- Empty Target/no DIRC/1Pb : 1 hr
  11. Install 1 Pb sheet: 1 hr
  12. Data CPP Test Configuration - Empty Target/no DIRC/0Pb : 1 hr
  13. Install 2 Pb sheets: 1 hr
  14. Data CPP Test Configuration - Empty Target/no DIRC/2Pb : 1 hr

Restore GlueX configuration and prepare for GEM-TRD Test. Tue day Sep 1

  1. Fill Target
  2. Restore nominal GlueX configuration: 4 hours.

Required personnel

  1. Two persons needed to install/remove Pb Sheets
  2. Mark Dalton has volunteered to come in on Monday evening if a third person is required to monitor the target.
Tentative Shift Schedule
Date Shift Worker CPP
Mon Aug 31 4 pm - 10 pm T. Britton D. Lawrence
Mon Aug 31 10 pm - 4 am S. Furletov I. Larin
Tue Sep 01 4 am - 10 am M. Khachatryan E. Smith

DIRC survey

  1. The DIRC will have to be surveyed following the test.