Difference between revisions of "Tune Photon Beam"
From Hall D Ops Wiki
(→Tune Photon Beam) |
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#* Radiator 1.1·10<sup>-4</sup> RL. | #* Radiator 1.1·10<sup>-4</sup> RL. | ||
#* The 5mm collimator hole is at nominal beam position. | #* The 5mm collimator hole is at nominal beam position. | ||
| − | #* Profiler installed in Hall D collimator cave. Small calorimeter | + | #* Profiler installed in Hall D collimator cave. Small calorimeter in back of 3.5 mm hole (is such calorimeter necessary if we are likely to have a CW beam?). |
#* Pair spectrometer field on, converter retracted. | #* Pair spectrometer field on, converter retracted. | ||
#* Solenoid on with current ~1000A. | #* Solenoid on with current ~1000A. | ||
| Line 18: | Line 18: | ||
#* No target in place (use air along beamline as target). | #* No target in place (use air along beamline as target). | ||
# Activities | # Activities | ||
| − | #* (High) (Accel., HallD) Use the beam profiler and/or active collimator to move the photon beam to the hole in the collimator. Both the photon beam position and angles be controlled using the last quadrupole correctors on the electron line. | + | #* (High) (Accel., HallD) Use the beam profiler and/or active collimator to move the photon beam to the hole in the collimator. |
| + | #** Both the photon beam position and angles can be controlled using the last quadrupole's correctors on the electron line. | ||
| + | #** To what accuracy do we know the the motion due to the corrector (Todd S.)? | ||
#* (High) (RadCon/Hall D) Check radiation levels in the collimator cave and HallD. | #* (High) (RadCon/Hall D) Check radiation levels in the collimator cave and HallD. | ||
| − | #* Calibrate accelerator scale (calibrate the quadrupole correctors in term of beam position at the profiler). | + | #* (High) Calibrate accelerator scale (calibrate the quadrupole's correctors in term of beam position at the profiler). |
#* (High) (HallD) Turn the PS magnet on and install a 10<sup>-3</sup> converter. Tune the PS coarse detectors. | #* (High) (HallD) Turn the PS magnet on and install a 10<sup>-3</sup> converter. Tune the PS coarse detectors. | ||
#* (High) (HallD) Use the PS wire scanner and the coarse detectors to verify the beam location. | #* (High) (HallD) Use the PS wire scanner and the coarse detectors to verify the beam location. | ||
#* (High) (HallD) Insert a convertor in the PS and leave running with its own trigger throughout the run period. | #* (High) (HallD) Insert a convertor in the PS and leave running with its own trigger throughout the run period. | ||
#* (Moderate) (HallD, Accel.) Calibrate the active collimator by using the calibrated accelerator scale. Check the calibration by moving the collimator slide. | #* (Moderate) (HallD, Accel.) Calibrate the active collimator by using the calibrated accelerator scale. Check the calibration by moving the collimator slide. | ||
| − | #* ( | + | #* (Under discussion) (HallD) Install the profiler in front of the GlueX detector to verify beam position. Another possibility is to monitor for azimuthal asymmetries in the start counter. |
#* (Low) (HallD) Use beam line detectors (under discussion) and radiation devices to verify the beam position with respect to the beam pipes and the target. | #* (Low) (HallD) Use beam line detectors (under discussion) and radiation devices to verify the beam position with respect to the beam pipes and the target. | ||
| + | #* (High )(HallD) Install profiler in front of beam dump to verify that the beam is centered on the dump. | ||
#* (High) (HallD) Turn detectors on slowly, moving in from the peripheral to the center. Monitor the rates and background levels. | #* (High) (HallD) Turn detectors on slowly, moving in from the peripheral to the center. Monitor the rates and background levels. | ||
| − | #* (High)(HallD) Insert the CH2 cup target at the nominal target position. Set the regular trigger and monitor rate changes as the beam is scanned vertically and horizontally . | + | #* (High) (HallD) Insert the CH2 cup target at the nominal target position. Set the regular trigger and monitor rate changes as the beam is scanned vertically and horizontally . |
| − | #* (High)(HallD) Insert a thin target at the nominal target position. Set the regular trigger and take data for about 1 shift. | + | #* (High )(HallD) Insert a thin target at the nominal target position. Set the regular trigger and take data for about 1 shift. |
==[[One Week Pause in Running]]== | ==[[One Week Pause in Running]]== | ||
Revision as of 16:19, 17 July 2014
Contents
Main Page
Tune Electron Beam
Tune Photon Beam
- Goal: Tune the photon beam to go through the collimator, the experimental target area, and into the photon beam dump.
- Responsibility: HallD, Accelerator, RadCon.
- Priority: Most activities are High, but includes Moderate and Low priority activities.
- Conditions:
- Tagger hall equipment removed or shielded. This includes the microscope (TAGM) and the electronics.
- Beam 50nA CW (if possible).
- Radiator 1.1·10-4 RL.
- The 5mm collimator hole is at nominal beam position.
- Profiler installed in Hall D collimator cave. Small calorimeter in back of 3.5 mm hole (is such calorimeter necessary if we are likely to have a CW beam?).
- Pair spectrometer field on, converter retracted.
- Solenoid on with current ~1000A.
- GlueX detectors off (except peripheral such as BCAL)
- No target in place (use air along beamline as target).
- Activities
- (High) (Accel., HallD) Use the beam profiler and/or active collimator to move the photon beam to the hole in the collimator.
- Both the photon beam position and angles can be controlled using the last quadrupole's correctors on the electron line.
- To what accuracy do we know the the motion due to the corrector (Todd S.)?
- (High) (RadCon/Hall D) Check radiation levels in the collimator cave and HallD.
- (High) Calibrate accelerator scale (calibrate the quadrupole's correctors in term of beam position at the profiler).
- (High) (HallD) Turn the PS magnet on and install a 10-3 converter. Tune the PS coarse detectors.
- (High) (HallD) Use the PS wire scanner and the coarse detectors to verify the beam location.
- (High) (HallD) Insert a convertor in the PS and leave running with its own trigger throughout the run period.
- (Moderate) (HallD, Accel.) Calibrate the active collimator by using the calibrated accelerator scale. Check the calibration by moving the collimator slide.
- (Under discussion) (HallD) Install the profiler in front of the GlueX detector to verify beam position. Another possibility is to monitor for azimuthal asymmetries in the start counter.
- (Low) (HallD) Use beam line detectors (under discussion) and radiation devices to verify the beam position with respect to the beam pipes and the target.
- (High )(HallD) Install profiler in front of beam dump to verify that the beam is centered on the dump.
- (High) (HallD) Turn detectors on slowly, moving in from the peripheral to the center. Monitor the rates and background levels.
- (High) (HallD) Insert the CH2 cup target at the nominal target position. Set the regular trigger and monitor rate changes as the beam is scanned vertically and horizontally .
- (High )(HallD) Insert a thin target at the nominal target position. Set the regular trigger and take data for about 1 shift.
- (High) (Accel., HallD) Use the beam profiler and/or active collimator to move the photon beam to the hole in the collimator.
