during_experiments
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during_experiments [2015/10/29 14:12] pereira [Particle identification corrections] |
during_experiments [2023/07/20 10:43] (current) 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]] | ||
| + | * [[#Particle identification corrections]] | ||
| + | * [[# | ||
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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" | + | |
| + | |||
| + | | ||
| * 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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| * In [[s800 SpecTcl|SpecTcl GUI]], click **Attach to File** and select data file **run-xxxx-xx.evt** in directory **/ | * In [[s800 SpecTcl|SpecTcl GUI]], click **Attach to File** and select data file **run-xxxx-xx.evt** in directory **/ | ||
| - | * Looking at the spectrum **PID: | + | * Looking at the spectrum **PID: |
| * Enter a new value (typically in the range 500-1000) | * Enter a new value (typically in the range 500-1000) | ||
| * Click **Set** | * Click **Set** | ||
| * Re-scan the data file | * Re-scan the data file | ||
| - | * Keep trying different values, until the dependence is eliminated. The figure below (right) shows the corrected spectrum (for this particular case, **s800.tof.obj2Correction1** = 450) | + | * Keep trying different values, until the dependence is eliminated. The figure below (bottom) shows the corrected spectrum (for this particular case, **s800.tof.obj2Correction1** = 450) |
| {{: | {{: | ||
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| - | * Repeat the process looking now at the spectrum **PID: | + | * Repeat the process looking now at the spectrum **PID: |
| * Enter a new value for the variable **s800.tof.obj2Correction2** (typically in the range 0.01-0.1) | * Enter a new value for the variable **s800.tof.obj2Correction2** (typically in the range 0.01-0.1) | ||
| * Click **Set** | * Click **Set** | ||
| * Re-scan the data file | * Re-scan the data file | ||
| - | * Keep trying different values, until the dependence is eliminated. The figure below (right) shows the corrected spectrum (for this particular case, **s800.tof.obj2Correction2** = 0.05) | + | * Keep trying different values, until the dependence is eliminated. The figure below (bottom) shows the corrected spectrum (for this particular case, **s800.tof.obj2Correction2** = 0.05) |
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| * The correction process described above can be used for other ToF. SpecTcl includes a set of corrected ToF parameters and variables for the OBJ-FP and XFP-FP ToFs taken from the Phillips TDC, TACs, and MTDC: | * The correction process described above can be used for other ToF. SpecTcl includes a set of corrected ToF parameters and variables for the OBJ-FP and XFP-FP ToFs taken from the Phillips TDC, TACs, and MTDC: | ||
| - | * s800.tof.objcorr1, | + | * **s800.tof.objcorr1**, **s800.tof.obj1Correction1**, **s800.tof.obj1Correction2**: Corrected parameter and correction variables for the OBJ-FP ToF taken from the Phillips TDC |
| - | * s800.tof.objcorr2, | + | * **s800.tof.objcorr2**, **s800.tof.obj2Correction1**, **s800.tof.obj2Correction2**: Corrected parameter and correction variables for the OBJ-FP ToF taken from the ORTEC TAC |
| - | * s800.tof.objcorr3, | + | * **s800.tof.objcorr3**, **s800.tof.obj3Correction1**, **s800.tof.obj3Correction2**: Corrected parameter and correction variables for the OBJ-FP ToF taken from the MTDC |
| - | * s800.tof.xfpcorr1, | + | * **s800.tof.xfpcorr1**, **s800.tof.xfp1Correction1**, **s800.tof.xfp1Correction2**: Corrected parameter and correction variables for the XFP-FP ToF taken from the Phillips TDC |
| - | * s800.tof.xfpcorr2, | + | * **s800.tof.xfpcorr2**, **s800.tof.xfp2Correction1**, **s800.tof.xfp2Correction2**: Corrected parameter and correction variables for the XFP-FP ToF taken from the ORTEC TAC |
| - | * s800.tof.xfpcorr3, | + | * **s800.tof.xfpcorr3**, **s800.tof.xfp3Correction1**, **s800.tof.xfp3Correction2**: Corrected parameter and correction variables for the XFP-FP ToF taken from the MTDC |
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| + | ===== 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. | ||
| + | Before shimming, make sure that the thresholds are set properly (not too high) (refer to section " | ||
| - | ===== Handling detectors ===== | ||
| ==== Shimming OBJ scintillator ==== | ==== Shimming OBJ scintillator ==== | ||
during_experiments.1446142343.txt.gz · Last modified: 2015/10/29 14:12 by pereira
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