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tuning_the_s800_xdt [2016/03/13 16:18] pereira [FP scintillator setup] |
tuning_the_s800_xdt [2017/06/17 14:44] pereira [Object scintillator setup] |
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* Check CFD walk inspect signal in scope by triggering scope with CFD output | * Check CFD walk inspect signal in scope by triggering scope with CFD output | ||
* Ensure that CFD delay cable is ok: about 80% of raising time of the input signal | * Ensure that CFD delay cable is ok: about 80% of raising time of the input signal | ||
- | * Adjust CFD threshold looking at scalers. The ratio of OBJ to XFP scaler rates (channels OBJ.Scint and XFP.Scint) should reflect the transmission of the cocktail beam | + | * Adjust CFD threshold looking at scalers. |
+ | * With beam on/off, check amplitude of signals from OBJ. You should be able to clearly see the difference between noise signals and fragment-beam signals. | ||
+ | * Raise thresholds to get rid of noise signals. | ||
+ | * NOTE: Be aware that sometimes, after running for a while, the OBJ box is activated. This results in a non-negligible count rate in OBJ scalers with beam off, which comes from HIGH amplitude signals (not noise). DO NOT try to eliminate this " | ||
+ | * The ratio of OBJ to XFP scaler rates (channels OBJ.Scint and XFP.Scint) should reflect the transmission of the cocktail beam (between 60% to 90%, depending on quality of tunning) | ||
* Adjust MCFD threshold: | * Adjust MCFD threshold: | ||
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==== FP scintillator setup ==== | ==== FP scintillator setup ==== | ||
+ | |||
+ | * Make sure that S800 DAQ is in [[s800 daq tools# | ||
* 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 | ||
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{{: | {{: | ||
+ | |||
+ | * Check **[[s800 SpecTcl|Spectcl]]** window **S800_CRDCS_EFF.win** (see figure below) to verify the efficiency of the detectors. | ||
+ | * Start a new run recording data on disk | ||
+ | * Make a gate in spectrum **ic.sum** (top right plot) to select the Z region of interest, and call it **ic** | ||
+ | * Make a summing region around the " | ||
+ | * Stop the run and rescan data from disk | ||
+ | * Compare the number of event inside the 2D summing regions with the number of events inside the **ic** gate. Typically the former are very close to the later (nearly 100% efficiency for medium/high Z) | ||
+ | |||
+ | {{: | ||
==== Timing setup ==== | ==== Timing setup ==== | ||
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* 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). Note that in a unreacted-beam setting, the first hit typically provides the " | * 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). Note that in a unreacted-beam setting, the first hit typically provides the " | ||
* 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 |
{{: | {{: | ||
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* Using the cursor mouse, check the lower and higher limits defining the region in the MTDC ToF spectra with the " | * 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: | * Go to the **Variables** page in SpecTcl GUI and assign the limits to the following variables: | ||
- | * **s800.fp.vmetdc.mtdc_objlow** and **s800.fp.vmetdc.mtdc_rfhigh** for RF-XFP | + | * **s800.fp.vmetdc.mtdc_rflow** and **s800.fp.vmetdc.mtdc_rfhigh** for RF-XFP |
- | * **s800.fp.vmetdc.mtdc_objlow** and **s800.fp.vmetdc.mtdc_rfhigh** for OBJ-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 | * **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**, | * 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 |
- | * Using the [[S800 DAQ tools# | + | * Using the [[S800 DAQ tools# |
- | * Select | + | * Connect |
- | * Adjust the TDC delays of OBJ and XFP using the delay boxes connected to the CANBERRA CFD 454 in data U6 | + | * Adjust the TDC delays of OBJ and/or XFP with respect to the TDC start using the delay boxes connected to the CANBERRA CFD 454 in data U6 (~200 ns delay is good) |
- | * Adjust | + | * Check the corresponding ToF spectra in SpecTcl to confirm that the timings are properly |
- | * In principle, | + | |
* Check the efficiencies of the Phillips TDC, TACs, and MTDC for the OBJ-FP and XFP-FP ToFs: | * Check the efficiencies of the Phillips TDC, TACs, and MTDC for the OBJ-FP and XFP-FP ToFs: | ||
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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 | ||
* SAVE TO FILE | * SAVE TO FILE | ||
- | * Stop and start **[[s800 daq tools#Run Control Window|RunControl]]** to assert new trigger condition | + | * Begin a new run on [[#Readout GUI|Readout GUI]] to assert new trigger condition |
* Select **[[s800 SpecTcl|Spectcl]]** window **S800_DISPMATCH.win** | * Select **[[s800 SpecTcl|Spectcl]]** window **S800_DISPMATCH.win** |