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tuning_the_s800_xdt [2015/10/25 16:27] pereira |
tuning_the_s800_xdt [2015/10/26 13:57] pereira [Checking Particle ID and rate at S800 FP] |
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- | === Send beam to FP === | + | ==== Send beam to FP ==== |
* Ensure that the S800 spectrograph magnets are tuned to the right rigidity | * Ensure that the S800 spectrograph magnets are tuned to the right rigidity | ||
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- | === Object scintillator setup === | + | ==== Object scintillator setup ==== |
* Bias detector. Typical bias: **1200-1800 V** (up to 2200 V) | * Bias detector. Typical bias: **1200-1800 V** (up to 2200 V) | ||
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* Watch for no rate change on scaler display with a bias adjustment up or down of about 50-100 V | * Watch for no rate change on scaler display with a bias adjustment up or down of about 50-100 V | ||
- | === FP scintillator setup === | + | ==== FP scintillator setup ==== |
* Set trigger to “s800 trigger” | * Set trigger to “s800 trigger” | ||
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- | === Ionization Chamber setup === | + | ==== Ionization Chamber setup ==== |
* Gas should be [[Gas handling system# | * Gas should be [[Gas handling system# | ||
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- | === CRDCs setup === | + | ==== CRDCs setup ==== |
* **[[hv bias#hv remote control|Bias]]** CRDCs | * **[[hv bias#hv remote control|Bias]]** CRDCs | ||
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- | === Timing setup === | + | ==== Timing setup ==== |
+ | At present, there are three electronic " | ||
- | Overview: | ||
- | * There are three electronic " | + | * Select SpecTcl window **S800_TOF.win** |
- | * Although | + | * The three columns correspond to the **RF-FP** |
- | * Before going to the ToF modules, the OBJ and XFP signals are sent to a CANBERRA CFD 454 CFD in data U6 from the data-U6 patch panel (OBJ: patch panel #54, XFP: patch panel #1). (The exception is the OBJ signal into the MTDC) | + | * The first (top) row corresponds to the Phillips TDC |
- | * MTDC: | + | * The second row corresponds to the MTDC with all the hits included |
- | * Before getting into the MTDC, the OBJ, XFP, and E1 up signals in the MTDC go through a Mesytec MCFD | + | * The third row corresponds to the MTDC with only the first hit |
- | * The OBJ signal into the MCFD comes directly from the detector via S3 patch panel #94 (i.e., there is no signal to check in data U6) | + | * The fourth row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC** |
- | * The XFP signal into the MCFD module comes from data-U6 patch panel #70, connected | + | * The two spectra in the fifth row corresponds |
- | * SpecTcl calculates the OBJ-to-Focal-Plane | + | * 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 timing signals do not require external delay adjustments | + | * The MTDC spectra should never be empty because the matching window is sufficiently wide (around 4000 ns) |
- | * Tennelec TACs: | + | |
- | * The OBJ **stop** signal to the " | + | |
- | * The XFP **stop** signal to the " | + | |
- | * Phillips TDC: | + | {{:wiki:SpecTcl-e14019-run103.jpg? |
- | * The OBJ output signal from the CANBERRA 454 CFD is delayed with the low-noise delay boxes in data-U6, and sent to the TDC via patch panel #67 | + | |
- | * The XFP output signal from the CANBERRA 454 CFD is delayed with the low-noise delay boxes in data-U6, and sent to the TDC via patch panel #66 | + | |
- | * SpecTcl | + | |
- | | + | |
+ | * Using the [[S800 DAQ tools# | ||
+ | * Select the timing | ||
+ | * 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 E1 up, down using the Delay GUI | ||
+ | * In principle, the TACs delays don' | ||
- | * Examine the timing of each of the selectable listed signals with respect to the “Live Trigger” signal | + | ==== Checking Particle ID and rate at S800 FP ==== |
- | * There are 4 TDC inspect channels patched to data-U6 that can be assigned using the trigger GUI | + | |
- | * The full range of the TDC is 400 ns | + | |
- | * Set each timing to 200 ns | + | |
- | * TDCs of last 4 listed signals (including XF and object scintillators) are bypassed with cable delays inside the vault and thus their delays cannot be controlled with the GUI | + | |
- | * They can be inspected, however using the GUI | + | |
+ | * 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 first (top) row corresponds to the Phillips TDC | ||
+ | * The second row corresponds to the MTDC with just the first hit included | ||
+ | * The third row corresponds to 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 | ||
- | * The TDC delays can only be changed when the run control is stopped; must SAVE settings before starting run control not to overwrite adjustments being made | + | {{: |
- | * Trigger the scope with the “Live Trigger” signal patched to data-U6 | ||
- | * There are 4 trigger inspect channels patched to data-U6 that can be assigned using the trigger GUI | ||
- | * Examine | + | * Establish PID and measure rate |
- | * There are 4 TDC inspect channels patched to data-U6 that can be assigned using the trigger GUI | + | * Determine |
- | * The full range of the TDC is 400 ns | + | * Take gates around |
- | * Set each timing to 200 ns | + | * Measure |
- | * TDCs of last 4 listed signals (including XF and object scintillators) are bypassed with cable delays inside | + | * Take a run on disk |
- | * They can be inspected, however using the GUI | + | * Measure |
- | + | * In **[[s800 | |
- | + | * Check the run time and live time from the corresponding scaler file in directory | |
- | | + | * Calculate the rate and purity and compare |
- | + | ==== Analysis line classic PPAC setup (Focus optics only) ==== | |
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- | * Information | + | |
- | * The signal delays controlled by the GUI (and not by cable delays) are not “pipelined” -– i.e., any new signals that arrive during the delay time of a previous signal are lost and thus deadtime is introduced into the system. | + | |
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- | === Checking Particle ID and rate at S800 FP === | + | |
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- | | + | |
- | * dE signal from Ion Chamber | + | |
- | * TOF from XF or Object scintillator to S800 FP | + | |
- | * Not necessary to implement dE- or TOF-based corrections | + | |
- | * Document | + | |
- | * Measure beam current with appropriate Faraday cups | + | |
- | * Timed run | + | |
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- | + | ||
- | === Analysis line classic PPAC setup (Focus optics only) === | + | |
* " | * " | ||
* Classic PPACs have rate limitations from pileups | * Classic PPACs have rate limitations from pileups | ||
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- | === Setup beamline === | + | ==== Setup beamline |
* Object and XF scintillators and intermediate image PPACs inserted if they will be used | * Object and XF scintillators and intermediate image PPACs inserted if they will be used | ||
* If Object scintillator will not be used, there is no reason to look at beam on it unless to debug a problem with the transmission | * If Object scintillator will not be used, there is no reason to look at beam on it unless to debug a problem with the transmission | ||
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* Set spectrograph Brho for unreacted fragment | * Set spectrograph Brho for unreacted fragment | ||
- | === Start scalers === | + | ==== Start scalers |
* Use s800 account | * Use s800 account | ||
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* scalers (gives error if no bridge) | * scalers (gives error if no bridge) | ||
- | === Setting Optimization === | + | ==== Setting Optimization |
=== Focused optics === | === Focused optics === |