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tuning_the_s800_xdt [2015/10/29 10:48] pereira [Timing setup] |
tuning_the_s800_xdt [2015/10/29 13:22] pereira [Timing setup] |
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* 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). 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 " | ||
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* 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) | ||
{{: | {{: | ||
+ | |||
+ | * 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_objlow 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_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: | ||
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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 | ||
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==== 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** 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 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 | ||
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* 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 |