Difference between revisions of "SRC/CT Run Plan"
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| + | ===Possible detailed plan for C->D change (not finalized)=== | ||
| + | Monday (13th):<br> | ||
| + | 1900: Begin to ramp down solenoid | ||
| + | |||
| + | Tuesday (14th):<br> | ||
| + | 0300: Solenoid is ramped down, take straight track running, may need to optimize trigger for this<br> | ||
| + | 0700/0800: RadCon sweep, Hall in Controlled?<br> | ||
| + | 0800-1200: Survey and alignment of carbon foil target<br> | ||
| + | 1200-1700: Techs and Chris swap C target with D<br> | ||
| + | 1700-0100: Ramp solenoid, pump target<br> | ||
| + | 0100: Production D data | ||
==General Conditions== | ==General Conditions== | ||
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| − | === Corrections to the photon flux due to the beam energy === | + | === Corrections to the photon flux due to the smaller beam energy === |
* Run conditions approved by PAC and ERR | * Run conditions approved by PAC and ERR | ||
** Electron beam energy: 12 GeV | ** Electron beam energy: 12 GeV | ||
| Line 169: | Line 181: | ||
** R = N<sub>phot</sub> <sup> 12 GeV </sup> / N<sub>phot</sub> <sup> 10.8 GeV </sup> | ** R = N<sub>phot</sub> <sup> 12 GeV </sup> / N<sub>phot</sub> <sup> 10.8 GeV </sup> | ||
** R (0 - 8 GeV) = 1.17 | ** R (0 - 8 GeV) = 1.17 | ||
| − | ** R (0 - | + | ** R (0 - endpoint) = 1.2 |
** R (8 - 9 GeV) = 2 | ** R (8 - 9 GeV) = 2 | ||
| − | ** R (8 - | + | ** R (8 - endpoint) = 1.93 |
** For C and LHe4 runs the beam current was increased to 150 nA (by about 7%), max approved by RadCon | ** For C and LHe4 runs the beam current was increased to 150 nA (by about 7%), max approved by RadCon | ||
| + | ** Correction to the photon flux in the energy range of interest due to the beam energy change: 1.6 - 1.7 | ||
== Setting up photon beam == | == Setting up photon beam == | ||
Latest revision as of 08:56, 8 December 2021
Contents
[hide]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 |
Possible detailed plan for C->D change (not finalized)
Monday (13th):
1900: Begin to ramp down solenoid
Tuesday (14th):
0300: Solenoid is ramped down, take straight track running, may need to optimize trigger for this
0700/0800: RadCon sweep, Hall in Controlled?
0800-1200: Survey and alignment of carbon foil target
1200-1700: Techs and Chris swap C target with D
1700-0100: Ramp solenoid, pump target
0100: Production D data
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 smaller 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 - endpoint) = 1.2
- R (8 - 9 GeV) = 2
- R (8 - endpoint) = 1.93
- For C and LHe4 runs the beam current was increased to 150 nA (by about 7%), max approved by RadCon
- Correction to the photon flux in the energy range of interest due to the beam energy change: 1.6 - 1.7
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.
