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timing [2016/07/24 17:57] pereira |
timing [2019/05/24 14:10] pereira |
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Although it is possible to measure the ToF between any pair of timing sources, there are three " | Although it is possible to measure the ToF between any pair of timing sources, there are three " | ||
- | Although the timing reference (" | + | Although the timing reference (" |
Some important things to know about each of these modules: | Some important things to know about each of these modules: | ||
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* The width and delay of the matching window can be changed in file **vmusbdaqconfig.tcl** in directory **/ | * The width and delay of the matching window can be changed in file **vmusbdaqconfig.tcl** in directory **/ | ||
* SpecTcl calculates the OBJ-FP and XFP-FP ToFs by substracting the E1 up time (MTDC channel 15) to the OBJ time (MTDC channel 3) and the XFP time (MTDC channel 2) | * SpecTcl calculates the OBJ-FP and XFP-FP ToFs by substracting the E1 up time (MTDC channel 15) to the OBJ time (MTDC channel 3) and the XFP time (MTDC channel 2) | ||
- | * Note that the same flat ribbon cable connected to the MTDC is also feeding the scaler module. Thus, the 16 channels in the MTDC are exactly the same as channels | + | * Note that the same flat ribbon cable connected to the MTDC is also feeding the scaler module. Thus, the 16 channels in the MTDC are exactly the same as channels |
* Copies of the timing signals from XF and OBJ used for the TAC ToF were included in channels 8 and 9 of the MTDC (also the scaler) | * Copies of the timing signals from XF and OBJ used for the TAC ToF were included in channels 8 and 9 of the MTDC (also the scaler) | ||
* The table below lists the MTDC channels: | * The table below lists the MTDC channels: | ||
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^ E1 up ^ 14 | LeCroy Var. ampl. -> Mesytec MCFD ch #0 -> ECL-NIM -> Fan in/out -> Fan in/out -> Fan in/out -> NIM-ECL | | ^ E1 up ^ 14 | LeCroy Var. ampl. -> Mesytec MCFD ch #0 -> ECL-NIM -> Fan in/out -> Fan in/out -> Fan in/out -> NIM-ECL | | ||
^ E1 up ^ 15 | LeCroy Var. ampl. -> Mesytec MCFD ch #0 -> ECL-NIM -> Fan in/out -> Fan in/out -> NIM-ECL | | ^ E1 up ^ 15 | LeCroy Var. ampl. -> Mesytec MCFD ch #0 -> ECL-NIM -> Fan in/out -> Fan in/out -> NIM-ECL | | ||
+ | ^ II PPAC2 anode ^ 16 | Mesytec MCFD2 ch #0 | | ||
+ | ^ II PPAC2 down ^ 17 | Mesytec MCFD2 ch #1 | | ||
+ | ^ II PPAC2 up ^ 18 | Mesytec MCFD2 ch #2 | | ||
+ | ^ II PPAC2 right ^ 19 | Mesytec MCFD2 ch #3 | | ||
+ | ^ II PPAC2 left ^ 20 | Mesytec MCFD2 ch #4 | | ||
+ | ^ II PPAC1 anode ^ 21 | Mesytec MCFD2 ch #5 | | ||
+ | ^ II PPAC1 down ^ 22 | Mesytec MCFD2 ch #6 | | ||
+ | ^ II PPAC1 up ^ 23 | Mesytec MCFD2 ch #7 | | ||
+ | ^ II PPAC1 right ^ 24 | Mesytec MCFD2 ch #8 | | ||
+ | ^ II PPAC1 left ^ 25 | Mesytec MCFD2 ch #9 | | ||
+ | |||
The multi-hit capability requires some special attention. Let's imagine a situation where the rate from OBJ detector is much higher than from the FP detector. During this window, the MTDC will record one hit from the FP scintillator (E1 up, which SpecTcl uses as the start ToF reference) and multiple hits from the OBJ scintillator (stops). As a results, SpecTcl will generate an array of OBJ-FP ToFs called **s800.fp.vmetdc.obj.i**, | The multi-hit capability requires some special attention. Let's imagine a situation where the rate from OBJ detector is much higher than from the FP detector. During this window, the MTDC will record one hit from the FP scintillator (E1 up, which SpecTcl uses as the start ToF reference) and multiple hits from the OBJ scintillator (stops). As a results, SpecTcl will generate an array of OBJ-FP ToFs called **s800.fp.vmetdc.obj.i**, |