during_experiments
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during_experiments [2015/10/29 14:11] pereira [Particle identification corrections] |
during_experiments [2017/06/17 14:54] pereira [Efficiency of OBJ Scintillator] |
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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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| The following process describes how to improve the resolution of the PID. This correction is supposed to be done " | The following process describes how to improve the resolution of the PID. This correction is supposed to be done " | ||
| - | * The SpecTcl parameters **s800.tof.objcorr1**, | + | The SpecTcl parameters **s800.tof.objcorr1**, |
| - | * The SpecTcl parameters **s800.tof.xfpcorr1**, | + | The SpecTcl parameters **s800.tof.xfpcorr1**, |
| - | * The process described below describes to improve the resolution of the PID based on the **OBJ-FP** ToF from the ORTEC TAC. The correction process for the PID spectra based on other ToFs is similar | + | The process described below describes to improve the resolution of the PID based on the **OBJ-FP** ToF from the ORTEC TAC. The correction process for the PID spectra based on other ToFs is similar |
| * Open the **Variables** page in SpecTcl and make sure that the variables **s800.tof.obj2Correction1** and **s800.tof.obj2Correction2** are zero. (The figure below shows the Variables page with the final values of the correction variables) | * Open the **Variables** page in SpecTcl and make sure that the variables **s800.tof.obj2Correction1** and **s800.tof.obj2Correction2** are zero. (The figure below shows the Variables page with the final values of the correction variables) | ||
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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.txt · Last modified: 2023/07/20 10:43 by swartzj
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