tuning_the_s800_xdt
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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tuning_the_s800_xdt [2015/10/27 16:42] pereira [Send beam to FP] |
tuning_the_s800_xdt [2015/10/29 11:26] pereira [Timing setup] |
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| * 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** | + | * 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 94: | ||
| - | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_IC.win** | + | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_IC.win** |
| * Adjust pad gains | * Adjust pad gains | ||
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| * 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** (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**) | + | * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS.win** in directory **/ |
| * 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) | ||
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| * 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 should never be empty because the matching window is sufficiently wide (around 4000 ns) | * The MTDC spectra should never be empty because the matching window is sufficiently wide (around 4000 ns) | ||
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| * 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 | ||
| + | |||
| + | * Due to the MTDC has multi-hit capabilities. Let's assume that | ||
| + | |||
| + | * Now Let's imagine a situation where the rate from OBJ detector is much higher than from the FP detector. During this window, the MTDC will record one hit from the FP scintillator (which SpecTcl uses as the start ToF reference) and multiple hits from the OBJ scintillator (stops). As a results, we will have a series of OBJ-FP ToFs. | ||
| + | |||
| + | |||
| + | * Each of the ToFs from the MTDC has an array of parameters. For instance, for the OBJ-FP ToF, SpecTcl assigns an array of parameters s800.fp.vmetdc.obj.i, | ||
| + | * In an unreacted-beam setting at moderate rates, the first hit i=0 does typically correspond to the good ToF (start and stop come from the same event, as shown in the summary spectra above) | ||
| + | * This is not the case in a typical reaction setting, where there is a chance that earliest ToF hits | ||
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| * Select SpecTcl window **S800_PID.win** in directory **/ | * Select SpecTcl window **S800_PID.win** in directory **/ | ||
| * 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 the Phillips TDC | + | * The first (top) row corresponds to PID spectra using the Phillips TDC |
| - | * The second row corresponds to the MTDC with just the first hit included | + | * The second row corresponds to PID spectra using the MTDC with __just |
| - | * The third row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC** | + | * The third row corresponds to PID spectra using the MTDC gated on the " |
| + | * The fourth 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 | ||
tuning_the_s800_xdt.txt · Last modified: 2023/09/22 15:15 by swartzj
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