SRC/CT Run Plan

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Plan for 8 Nov-6 Dec

Note that shifts here correspond to accelerator shifts.

See visually here

Activity Time (shifts) Beam current Radiator Comment
Liquid He target
Tune beam to tagger hall 3
Ion chamber calibration
Radiation monitor check
0.6
Harp scan for electron beam 0.2 Establish photon beam
Calib active collimator 0.5
Align JD70 - 105 radiator 1.5
Detector checkout, Trigger / DAQ tuning 3 10 - 150 nA
Collect data in row mode 0.1 10 - 150
Total 2.5 days
Production with 4He target
48 ( 12 days )
1
140 nA
50 nA
Empty (He) target run 2
Target change to D 2
Production with D target 8 (2 days)
1
140 nA
50 nA
Target change to C
Ramp the solenoid magnet down
Install and align target
Compton run no field
Ramp the magnet up

1.25
1.5
0.5
1.25
Production with C target 36 ( 9 days ) 140 nA
Total 28 days

General Conditions

The following numbers were taken from the production running conditions.

Numbers need to be updated for our run.

Item Polarized Beam
Beam Current 140 nA
Active Collimator (Inner) optimal coordinates x = 1.0 mm, y = −0.2 mm
BPM (IPM5C11B) optimal coordinates x = −0.5 mm, y = +1.0 mm
Tagger Quadrupole (MQPAD00) Current −4.2 A
Tagger Magnet Current 208.4 A
Radiator JD70-105, 47 μm
Coherent Peak Position 8600 ± 10 MeV
Beam Profiler retracted
Collimator 5.0 mm
TPol target Be 75 μm
Pair Spect. Convertor retracted
Pair Spect. Magnet Current (set point) 910 A
GlueX Solenoid 1350 A
TAC retracted

Trigger Types

The experiment will have physics and monitoring triggers in the data stream. Previous trigger configuration here

  • Physics trigger
Trigger Type Trigger Bit (starting from 1)
Main Production trigger 0.7 FCAL + BCAL > 180 MeV & SC 1
BCAL > 1.1 GeV 3
Luminosity PS 4
  • Monitoring triggers
Trigger Type Trigger Bit
FCAL LED
BCAL LED
DIRC LED
Random

Detailed Activities

  • Beam established following Hall D procedures [1]

Prior to beam activities

  • Hall D techs Beamline assembled and pump
  • Hall D techs Ramp up the magnet

Calibration before production runs

Estimated time (1 Shift)

  • Establish typical tagged photon beam
  • Harp scans for the electron Beam (and PS)
  • Initial detector check out
  • Equalize CCAL gains (calibrate CCAL)
  • TAC run ??

DAQ checkout

Lower DAQ thresholds for MIPs. Starting numbers from previous studies:

  • E(BCAL)>180 MeV
  • E(FCAL)>250 MeV
  • 1 hit in start counter
  • 78 kHz, 90% livetime, 1 GB/s

Luminosity Scan

  • 1M(?) events runs with the following currents 30, 60, 90, 120, 150 nA
  • Ideal Rate 80 kHz (91% livetime)

Production runs with 4He

  1. Production run with 4He for 12 days
  2. 2 shifts for setup and Compton running

Empty Cell Runs

Estimated time (2 Shifts)

    • Target group pumps out the LHe from the target cell.
    • Target group bring up to room temperature.
    • Target group pump out of the cell.
  1. Runs with Empty Cell target (1 shift).

Production runs with D

  1. Target group cool down the cell filled with liquid D (Estimated time 1-2 shifts)
  2. Detector and DAQ checkout
  3. Production run with D for 2 days

Target swap to C ladder

Estimated time (5 Shifts: 1 Day)

  • With Radcon support, Hall D techs uncable and remove start counter from cryostat
  • With Radcon support, Target Group secures target gas, inerts the target piping, and bleeds vacuum chamber to atmospheric pressure
  • With Radcon support, Target Group removes foam portion of cryostat
  • With Radcon support, Target Group removes foam portion of cryostat
  • With Radcon support, Target Group removes superinsulation around target cell
  • With Radcon support, Target Group removes target cell
  • With Radcon support, Target Group mounts Carbon ladder in place of the gas cell
  • With Radcon support, Target Group, Foam portion of cryostat is put back in place, vacuum pumps on
  • With Radcon support, Hall D techs Start counter put back in place, cables attached
  • With Radcon support, Hall D techs Target inserted into solenoid
  • Survey adjusts position in solenoid
  • Hall D techs Beamline assembled and pump
  • Hall D techs Ramp up the magnet

Production runs with C

Run at nominal conditions for 9 days.