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tuning_the_s800_xdt [2015/10/26 12:00] pereira [Timing setup] |
tuning_the_s800_xdt [2015/10/26 13:21] pereira [Timing setup] |
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At present, there are three electronic " | At present, there are three electronic " | ||
- | * Although the ToF reference (" | ||
- | * 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) | ||
- | * MTDC: | ||
- | * Before getting into the MTDC, the OBJ, XFP, and E1 up signals in the MTDC go through a Mesytec MCFD | ||
- | * 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 XFP signal into the MCFD module comes from data-U6 patch panel #70, connected to the CANBERRA 454 CFD XFP output | ||
- | * SpecTcl calculates the OBJ-to-Focal-Plane and XFP-to-Focal-Plane ToFs by substracting the E1 up time (MTDC channel 15) to the OBJ time (MTDC channel 3) and the XFP time (MTDC channel 2) | ||
- | * The MTDC timing signals do not require external delay adjustments because the matching window is sufficiently wide | ||
- | * Tennelec TACs: | ||
- | * The OBJ **stop** signal to the " | ||
- | * The XFP **stop** signal to the " | ||
- | * Phillips TDC: | + | * Select SpecTcl window **S800_TOF.win** |
- | * 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 three columns correspond to the **RF-FP** ToF (left), **OBJ-FP** (center), and **XFP-FP** (right) |
- | * The XFP output signal from the CANBERRA 454 CFD is delayed | + | * The first (top) row corresponds |
- | * SpecTcl calculates | + | * The second row corresponds to the MTDC with all the hits included |
+ | * The third row corresponds | ||
+ | * The fourth row corresponds to the ORTEC TACs. Note that there is not **RF-FP TAC** | ||
+ | * The two spectra in the fifth row corresponds | ||
+ | * 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 TDC start is sent from the ULM trigger module. Since the delay of the S800 trigger may be adjusted during XDT, the stop signals (e.g. from OBJ or XFP) will need to be re-adjusted. | + | {{: |
- | | + | |
- | * There are 4 TDC inspect channels patched to data-U6 that can be assigned using the trigger GUI | + | * Using ULM GUI assign |
- | * The full range of the TDC is 400 ns | + | * Select |
- | * Set each timing | + | * Adjust |
- | * TDCs of last 4 listed signals (including XF and object scintillators) are bypassed with cable delays inside | + | * Adjust |
- | * They can be inspected, however using the GUI | + | * In principle, |
- | + | ||
- | + | ||
- | * 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 | + | |
- | * There are 4 trigger inspect channels patched to data-U6 that can be assigned using the trigger GUI | + | |
- | + | ||
- | * Examine | + | |
- | * There are 4 TDC inspect channels | + | |
- | * 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 | + | |
- | * They can be inspected, however using the GUI | + | |
- | + | ||
- | + | ||
- | | + | |
- | + | ||
- | * The TDC delays | + | |
- | + | ||
- | * The “S800” trigger is from E1 up signal | + | |
- | + | ||
- | * 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 | + | |
- | + | ||
- | * Examine the timing of each of the selectable listed signals with respect | + | |
- | * 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 | + | |
- | + | ||
- | * 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. | + | |
- | * All of the trigger signals are not pipelined and are thus subject to deadtime | + | |
==== Checking Particle ID and rate at S800 FP ==== | ==== Checking Particle ID and rate at S800 FP ==== |