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 4He target </span> <br /> | | <span style="color:blue"> Production with 4He target </span> <br /> | ||
| 48 ( 12 days ) <br /> 1 <br /> 1 | | 48 ( 12 days ) <br /> 1 <br /> 1 | ||
− | | | + | | 150 <br /> 150 <br /> 50 |
− | | 4x10<sup>-4</sup> <br /> | + | | 4x10<sup>-4</sup> <br /> 4.5x10<sup>-4</sup> (AMO) <br /> 4x10<sup>-4</sup> |
| <br /> <br /> Insert CCAL, HV on for low-energy TAGH | | <br /> <br /> Insert CCAL, HV on for low-energy TAGH | ||
|- | |- | ||
Line 83: | Line 83: | ||
|- | |- | ||
| <span style="color:blue"> Production with D target </span> | | <span style="color:blue"> Production with D target </span> | ||
− | | 8 (2 days) | + | | 8 (2 days) |
− | | 140 | + | | 140 |
| | | | ||
| <br /> Insert CCAL, HV on for low-energy TAGH | | <br /> Insert CCAL, HV on for low-energy TAGH | ||
Line 94: | Line 94: | ||
| Empty liquid target | | Empty liquid target | ||
|- | |- | ||
− | | <span style="color:red"> Target change to C </span> <br /> Ramp the solenoid magnet down <br /> Install and align target | + | | <span style="color:red"> Target change to C </span> <br /> Ramp the solenoid magnet down <br /> Install and align target <br /> Ramp the magnet up |
− | | <br /> 1.25 <br /> 1.5 | + | | <br /> 1.25 <br /> 1.5 <br /> 1.25 |
− | | <br /> - <br /> - | + | | <br /> - <br /> - <br /> - |
− | | <br /> - <br /> - | + | | <br /> - <br /> - <br /> - |
| | | | ||
|- | |- | ||
| <span style="color:blue"> Production with C target </span> | | <span style="color:blue"> Production with C target </span> | ||
− | | | + | | 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 | ||
+ | |- | ||
+ | | <span style="color:red"> Target change to D </span> <br /> Ramp the solenoid magnet down <br /> Install and align target <br /> Ramp the magnet up | ||
+ | | <br /> 1.25 <br /> 1.5 <br /> 1.25 | ||
+ | | <br /> - <br /> - <br /> - | ||
+ | | <br /> - <br /> - <br /> - | ||
+ | | | ||
+ | |- | ||
+ | | <span style="color:blue"> Production with D target </span> | ||
+ | | 24 (6 days) | ||
+ | | 140 | ||
+ | | | ||
+ | | | ||
+ | | | ||
|- | |- | ||
| Total | | Total | ||
− | | | + | | 42 days |
| | | | ||
| | | | ||
| | | | ||
|} | |} | ||
+ | |||
+ | ===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== | ||
Line 130: | Line 155: | ||
| Tagger Quadrupole (MQPAD00) Current || −4.2 A | | Tagger Quadrupole (MQPAD00) Current || −4.2 A | ||
|- | |- | ||
− | | Radiator || JD70-105, 47 μm | + | | Radiator || JD70-105, 47 μm 4·10<sup>-4 </sup> R.L., 4.5·10 <sup>-4</sup> R.L. AL radiator (30 µm Al), 2·10<sup>-5</sup> R.L. AL |
|- | |- | ||
| Coherent Peak Position || 8.6 GeV | | Coherent Peak Position || 8.6 GeV | ||
Line 148: | Line 173: | ||
+ | === 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: 2·10<sup>7</sup> phot / sec | ||
+ | * Reduction of the beam energy from 12 GeV to 10.8 GeV | ||
+ | ** 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 - 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 == | == Setting up photon beam == |
Latest revision as of 08:56, 8 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 |
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.