tuning_the_s800_xdt
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tuning_the_s800_xdt [2015/10/29 09:57] pereira [Checking Particle ID and rate at S800 FP] |
tuning_the_s800_xdt [2017/04/08 13:42] pereira [Dispersion Matching Mode] |
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| * Set trigger to “s800 trigger” | * Set trigger to “s800 trigger” | ||
| - | * Ensure that the **[[s800 daq tools# | + | * Ensure that the **[[s800 daq tools# |
| * Under trigger tab select **s800 trigger** (which is E1 up by definition) | * Under trigger tab select **s800 trigger** (which is E1 up by definition) | ||
| * Deselect experiment trigger | * Deselect experiment trigger | ||
| Line 74: | Line 74: | ||
| * End and Begin **[[s800 daq tools#Run Control Window|ReadoutGUI]]** to assert new trigger condition | * End and Begin **[[s800 daq tools#Run Control Window|ReadoutGUI]]** to assert new trigger condition | ||
| - | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** in directory **/ | + | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_SCINT.win** in directory **/ |
| * Adjust **[[hv bias|bias]]** looking at 2D spectra **e1.deup_e1.dedown** (showing the parameters s800.fp.e1.de_down vs. s800.fp.e1.de_up) for the FP E1 scintillator | * Adjust **[[hv bias|bias]]** looking at 2D spectra **e1.deup_e1.dedown** (showing the parameters s800.fp.e1.de_down vs. s800.fp.e1.de_up) for the FP E1 scintillator | ||
| Line 94: | Line 95: | ||
| - | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_IC.win** | + | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_IC.win** |
| * Adjust pad gains | * Adjust pad gains | ||
| Line 127: | Line 127: | ||
| * Count rate is a little higher than on scintillator due to noise or thresholds | * Count rate is a little higher than on scintillator due to noise or thresholds | ||
| - | * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS.win** in directory **/ | + | * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS.win** (see figure below) to verify the good performance of the detectors. (The spectra for each CRDC can be checked separatelly in windows **s800_CRDC1.win** and **S800_CRDC2.win**) |
| * Spectra **crdc1.raws** and **crdc2.raws** (top and middle spectra in the leftmost (first) column) | * Spectra **crdc1.raws** and **crdc2.raws** (top and middle spectra in the leftmost (first) column) | ||
| Line 166: | Line 166: | ||
| * The three columns correspond to the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right) | * The three columns correspond to the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right) | ||
| * The first (top) row corresponds to the Phillips TDC | * The first (top) row corresponds to the Phillips TDC | ||
| - | * The second row corresponds to the MTDC with all the hits included | + | * The second row corresponds to the MTDC with all the hits included. Note that in a unreacted-beam setting, the first hit typically provides the " |
| * The third row corresponds to the MTDC with only the first hit | * The third row corresponds to the MTDC with only the first hit | ||
| * The fourth row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC** | * The fourth row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC** | ||
| - | * The two spectra in the fifth row corresponds to the MTDC summary spectra of OBJ-FP and XFP-FP ToFs (zoomed in). The spectra show the ToF (vertical axis) vs. hit number (horizontal axis). | + | * The two spectra in the fifth row corresponds to the MTDC summary spectra of OBJ-FP and XFP-FP ToFs (zoomed in). The spectra show the ToF (vertical axis) vs. hit number (horizontal axis). |
| * An empty ToF spectrum means that either the delays are not right (and need to be adjusted) or the spectrum range is too narrow | * An empty ToF spectrum means that either the delays are not right (and need to be adjusted) or the spectrum range is too narrow | ||
| - | * The MTDC spectra | + | * The MTDC delays |
| {{: | {{: | ||
| + | |||
| + | * Due to the multi-hit capability of the MTDC, we need to select the " | ||
| + | * Use the spectra **TOF.MTDC_RF**, | ||
| + | * Using the cursor mouse, check the lower and higher limits defining the region in the MTDC ToF spectra with the " | ||
| + | * Go to the **Variables** page in SpecTcl GUI and assign the limits to the following variables: | ||
| + | * **s800.fp.vmetdc.mtdc_rflow** and **s800.fp.vmetdc.mtdc_rfhigh** for RF-XFP | ||
| + | * **s800.fp.vmetdc.mtdc_objlow** and **s800.fp.vmetdc.mtdc_objhigh** for OBJ-XFP | ||
| + | * **s800.fp.vmetdc.mtdc_xfplow** and **s800.fp.vmetdc.mtdc_xfphigh** for XFP-XFP | ||
| + | * For each ToF, SpecTcl will search the hit number that fits in the selected region. The new MTDC ToF parameters are **s800.fp.vmetdc.mtdc_rf**, | ||
| * If necessary, adjust delays: | * If necessary, adjust delays: | ||
| Line 181: | Line 190: | ||
| * Adjust the TDC delays of E1 up, down using the Delay GUI | * Adjust the TDC delays of E1 up, down using the Delay GUI | ||
| * In principle, the TACs delays don't need to be adjusted | * In principle, the TACs delays don't need to be adjusted | ||
| + | |||
| + | |||
| + | * Check the efficiencies of the Phillips TDC, TACs, and MTDC for the OBJ-FP and XFP-FP ToFs: | ||
| + | * Make a gate on spectrum **IC.SUM** selecting the region of interest, and call it " | ||
| + | * Looking at the ToF spectra gated on " | ||
| + | * The window file **S800_TOF_EFFICIENCY.win** includes all the spectra needed | ||
| ==== Checking Particle ID and rate at S800 FP ==== | ==== Checking Particle ID and rate at S800 FP ==== | ||
| - | * Select SpecTcl window **S800_PID.win** in directory **/ | + | * Select SpecTcl window **S800_PID.win** |
| * The three columns correspond to the PID determined with the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right) | * The three columns correspond to the PID determined with the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right) | ||
| * The first (top) row corresponds to PID spectra using the Phillips TDC | * The first (top) row corresponds to PID spectra using the Phillips TDC | ||
| * The second row corresponds to PID spectra using the MTDC with __just the first hit included__ | * The second row corresponds to PID spectra using the MTDC with __just the first hit included__ | ||
| - | * The third row corresponds to PID spectra using the MTDC gated on the " | + | * The third row corresponds to PID spectra using the MTDC including the correct hit corresponding to the good ToF peak (see previous section) |
| - | * The fourth | + | * The fourth |
| + | * The fifth row corresponds to PID spectra using the ORTEC TACs. Note that there is not **RF-FP TAC** | ||
| * You might need to adjust the limits of the spectra to get a good resolution | * You might need to adjust the limits of the spectra to get a good resolution | ||
| Line 197: | Line 213: | ||
| * Establish PID and measure rate | * Establish PID and measure rate | ||
| - | * Determine | + | * Choose your favorite PID spectrum and determine |
| * Take gates around the fragment of interest | * Take gates around the fragment of interest | ||
| * Measure the beam intensity the appropriate faraday cup | * Measure the beam intensity the appropriate faraday cup | ||
| Line 267: | Line 283: | ||
| * Set trigger to “s800 trigger” | * Set trigger to “s800 trigger” | ||
| - | * Ensure that the **[[s800 daq tools# | + | * Ensure that the **[[s800 daq tools# |
| * Under trigger tab select **s800 trigger** (which is E1 up by definition) | * Under trigger tab select **s800 trigger** (which is E1 up by definition) | ||
| * Deselect experiment trigger | * Deselect experiment trigger | ||
| Line 321: | Line 337: | ||
| * What experimenters want (e.g., if they want singles, the cut has to be more restrictive to limit acquisition deadtime) | * What experimenters want (e.g., if they want singles, the cut has to be more restrictive to limit acquisition deadtime) | ||
| * Move blocker, decrease attenuator, repeat | * Move blocker, decrease attenuator, repeat | ||
| + | |||
| + | * If necessary, do the ToF corrections to improve the PID resolution (instructions [[During experiments# | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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