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tuning_the_s800_xdt [2015/10/27 14:24] pereira [Setting up Reaction Settings] |
tuning_the_s800_xdt [2015/10/29 10:48] pereira [Timing setup] |
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* Expected " | * Expected " | ||
- | * Ensure that CRAD04 | + | * Ensure that CRAD04 is enabled with a rate limit of **20 kHz** (CRAD04 looks at E1 up FP scintillator) |
* Remember: S800 FP rate limit is **6 kHz** | * Remember: S800 FP rate limit is **6 kHz** | ||
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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 | ||
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- | * 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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* They correspond to the non-dispersive position of the beam in the CRDCs. | * They correspond to the non-dispersive position of the beam in the CRDCs. | ||
- | {{: | + | {{: |
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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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* 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 | ||
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* Reaction setting to FP | * Reaction setting to FP | ||
* Start with Attenuator setting of unreacted beam and step up in intensity | * Start with Attenuator setting of unreacted beam and step up in intensity | ||
- | * Looking | + | * If necessary, set up beam blocker looking |
+ | * Click on label **I255 Slits** in the S3 page of Barney | ||
* Expected " | * Expected " | ||
* Expect to see unreacted beam if reaction setting is within +/- 3% of unreacted beam setting | * Expect to see unreacted beam if reaction setting is within +/- 3% of unreacted beam setting | ||
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- | |||
- | ====== Follow-up ====== | ||
- | |||
- | * Before leaving beam with experimenters | ||
- | * Set up current trip points on Linux HV controls | ||
- | * Values used for K-48 | ||
- | * 5 for CRDC and Ion Chamber anodes and intermediate image ppacs | ||
- | * 50 for CRDC drifts | ||
- | * 80 for IC drift | ||
- | * Ensure alarms are running | ||
- | * Make sure Linux HV GUI alarms are enabled | ||
- | * Make sure threshold on isobutane level is set up (not currently connected to alarms because they give too many false alarms when communication is lost) | ||
- | * All logs are being recorded | ||
- | * There is no log file for biases controlled by Labview | ||
- | * Linux HV | ||
- | * LabView gas handling system | ||
- | * Note in logbook | ||
- | * Scintillator biases | ||
- | * IC gate biases | ||
- | * Post reference printouts for experimenters | ||
- | * HV status: a snapshot of HV GUI | ||
- | * Gas handling system status: a snapshot of LabView window | ||
- | |||
- | * Create window configuration with summing regions to make it easier for experimenters to track efficiency/ | ||
- | |||
- | * Setting up coincidences for additional reaction settings in an experiment | ||
- | * Do not need to redo coincidence settup if secondary beam does not change | ||
- | * Might need to redo coincidence setup if secondary beam changes drastically | ||
- | |||
- | * To watch during experiment | ||
- | * Look for isobutene running out – messes up data over several hours | ||
- | |||
- | * Implementing dE- or TOF-based corrections is part of EXR | ||
- | |||
- | More detail needed | ||
- | Minimum rates required for coincidence setup | ||
- | Selection of appropriate substitute reactions for coincidence setup | ||
- | How to feel comfortable that there will not be a problem with FP detector gases running out | ||
- | Starting alarms | ||
- | Starting logging | ||