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during_experiments [2016/01/19 10:36] pereira |
during_experiments [2023/07/20 10:43] swartzj |
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====== During experiment ====== | ====== During experiment ====== | ||
This section describes support tasks that are typically requested during the course of an experiment. Some of them, like Mask calibration, | This section describes support tasks that are typically requested during the course of an experiment. Some of them, like Mask calibration, | ||
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* [[#Mask calibration]] | * [[#Mask calibration]] | ||
* [[#Particle identification corrections]] | * [[#Particle identification corrections]] | ||
- | * [[#Handling detectors]] | + | * [[#Efficiency of OBJ Scintillator]] |
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* Set the trigger to S800 singles and downscale factor 1 | * Set the trigger to S800 singles and downscale factor 1 | ||
- | * On PanelMate, open page 4 in S800DRIV | + | |
- | * Click on "upstream mask" | + | |
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* Start a run without taking to disk and look in the S800 SpecTcl at the 2D xy position spectrum of (s800.fp.crdc1.x, | * Start a run without taking to disk and look in the S800 SpecTcl at the 2D xy position spectrum of (s800.fp.crdc1.x, | ||
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{{: | {{: | ||
- | * Remove | + | * Remove |
- | * Repeat the procedure with CRDC2 by inserting the "downstream mask" | + | * Repeat the procedure with CRDC2 by inserting |
* {{: | * {{: | ||
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- | ===== Handling detectors | + | ===== Efficiency of OBJ Scintillator |
+ | At relatively high rates (~0.5 MHz), the OBJ scintillator will be gradually damaged. Experimenters should check the efficiency of this detector continuously during the course of the experiment. Whenever the rates drop below ~90%, they may request the Device/Beam Physicist to shim the detector. | ||
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+ | Before shimming, make sure that the thresholds are set properly (not too high) (refer to section " | ||
==== Shimming OBJ scintillator ==== | ==== Shimming OBJ scintillator ==== |