Difference between revisions of "SRC/CT Run Plan"
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(→Plan for 8 Nov-6 Dec) |
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| <span style="color:blue"> Production with C target </span> | | <span style="color:blue"> Production with C target </span> | ||
| 68 ( 17 days ) <br /> 2 | | 68 ( 17 days ) <br /> 2 | ||
| − | | | + | | 150 <br /> 50 |
| 4x10<sup>-4</sup> | | 4x10<sup>-4</sup> | ||
| <br /> Insert CCAL, HV on for low-energy TAGH | | <br /> Insert CCAL, HV on for low-energy TAGH | ||
Revision as of 19:37, 2 December 2021
Contents
Plan for 8 Nov-6 Dec
Note that shifts here correspond to accelerator shifts.
See visually here
The standard configuration of the GlueX detector will be used during the SRC run
| Activity | Time (shifts) | Beam current (nA) | Radiator (R.L.) | 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 | 4x10-4 | |||
| Detector checkout, Trigger / DAQ tuning | 3 | 10 - 150 | same | ||
| Collect data in raw mode | 0.1 | 10 - 150 | |||
| Total | 2.5 days | ||||
| Production with 4He target |
48 ( 12 days ) 1 1 |
150 150 50 |
4x10-4 4.5x10-4 (AMO) 4x10-4 |
Insert CCAL, HV on for low-energy TAGH | |
| Empty (He) target run | 2 | ||||
| Target change to D | 2.0 | ||||
| Production with D target | 8 (2 days) | 140 | Insert CCAL, HV on for low-energy TAGH | ||
| TAC run (use CCAL as TAC) | 2 shifts | < 5 | 2x10-5 | Empty liquid target | |
| Target change to C Ramp the solenoid magnet down Install and align target Ramp the magnet up |
1.25 1.5 1.25 |
- - - |
- - - |
||
| Production with C target | 68 ( 17 days ) 2 |
150 50 |
4x10-4 | Insert CCAL, HV on for low-energy TAGH | |
| Target change to D Ramp the solenoid magnet down Install and align target Ramp the magnet up |
1.25 1.5 1.25 |
- - - |
- - - |
||
| Production with D target | 24 (6 days) | 140 | |||
| Total | 42 days |
General Conditions
| Item | Polarized Beam |
|---|---|
| Beam Energy | 10.9 GeV |
| Beam Current | 140 nA |
| Active Collimator (Inner) optimal coordinates | x = 0 mm, y = −0.2 mm (Will be updated) |
| BPM (IPM5C11B) optimal coordinates | x = −0.5 mm, y = +1.0 mm |
| Tagger Quadrupole (MQPAD00) Current | −4.2 A |
| Radiator | JD70-105, 47 μm 4·10-4 R.L., 4.5·10 -4 R.L. AL radiator (30 µm Al), 2·10-5 R.L. AL |
| Coherent Peak Position | 8.6 GeV |
| Beam Profiler | retracted |
| Collimator | 5.0 mm |
| Pair Converter | Be 75 μm |
| Pair Spect. Magnet Current (set point) | 850 A |
| GlueX Solenoid | 1350 A |
| TAC | retracted |
Corrections to the photon flux due to the beam energy
- Run conditions approved by PAC and ERR
- Electron beam energy: 12 GeV
- Energy range of interest: 8 - 9 GeV,
- Photon flux: 2·107 phot / sec
- Reduction of the beam energy from 12 GeV to 10.8 GeV
- R = Nphot 12 GeV / Nphot 10.8 GeV
- R (0 - 8 GeV) = 1.17
- R (0 - 12 GeV) = 1.2
- R (8 - 9 GeV) = 2
- R (8 - 12 GeV) = 1.93
Setting up photon beam
SRC production
- Standard configuration: Production on JD70-105 radiator. 2h runs and no more, as it may be hard to correct for calibration drifts. Cycle over 4 sets of runs: 0o, then 90o, then 45o, then 135o.
