SRC/CT Run Plan
From GlueXWiki
Contents
Tentative Schedule
Activity | Time | Beam Conditions |
---|---|---|
Target change C ladder |
3 shifts | no beam |
Detector and DAQ checkout | 2 shifts | 140 nA |
Luminosity Scan | 1 shift | Varies |
Run with C target |
20 days | 140 nA |
Compton running for density checks | 1 shift | |
Target change to 4He | 5 shifts | |
Compton running for density checks | 1-2 shift | |
Run with 4He | 10 days | 140 nA |
Empty Cell Run | 1 shift | 140 nA |
Target change to D | 3 shifts | |
Run D | 8 days | 140 nA |
Target change to Cu | 5 shifts | |
Run with Cu | 10 days | 140 nA |
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
1. Prior to beam activities
Estimated time (3 -4 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
2. 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 ??
Luminosity Scan
- 1M(?) events runs with the following currents 30, 60, 90, 120, 150 nA
- Ideal Rate 80 kHz (91% livetime)
Loading Liquid Targets
Contact | Details | |
---|---|---|
Disassemble beam pipe Retract target Remove ST Remove Gluex Cell |
||
Mount target cell Mount heat shield |
||
Survey | ||
Attach vacuum snout Attach ST Target in place Assemble beam pipe Pump vacuum in the target ladder |
||
Ramp Magnet up |
Loading Solid Targets
Contact | Details | |
---|---|---|
Disassemble beam pipe Retract target Remove ST Remove Gluex Cell |
||
Mount C foil ladder | ||
Survey | ||
Attach vacuum snout Attach ST Target in place Assemble beam pipe Pump vacuum in the target ladder |
||
Ramp Magnet up |