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trigger [2014/03/11 11:18] pereira [Scalers and dead time] |
trigger [2014/12/01 15:26] pereira [Trigger schematics] |
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===== Trigger schematics ===== | ===== Trigger schematics ===== | ||
- | The trigger schematic is shown on the Graphical User Interface (GUI) displayed in the figure below. | + | The trigger schematic is shown on the Graphical User Interface (GUI) displayed in the figure below. The GUI is automatically displayed when clicking in the Readout icon of the [[software|u6pc5]] desktop. |
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In addition, scalers are connected to the raw and live trigger signals. For the determination of the dead time, both a free running and vetoed 10 kHz pulser signal are also connected to scalers. This is the preferred method because the pulser is not subject to possible double triggering effects like the raw trigger. | In addition, scalers are connected to the raw and live trigger signals. For the determination of the dead time, both a free running and vetoed 10 kHz pulser signal are also connected to scalers. This is the preferred method because the pulser is not subject to possible double triggering effects like the raw trigger. | ||
- | The remining 16 scaler input channels (pins 17 to 32 in module) are connected to a 16-channel CFD CAEN C808, which sends the signals from the S800 detectors (E1 up, E1 down, CRDC1, CRDC2, OBJ_SCI, A1900 SCI, and OR Hodoscopes). | + | The remining 16 scaler input channels (pins 17 to 32 in module) are connected to a **16-channel CFD CAEN C808**, which sends the signals from the S800 detectors (**E1 up,** **E1 down**, **CRDC1**, **CRDC2**, **OBJ_SCI**, **A1900 SCI**, and **OR Hodoscope**). |
The list below is a direct copy of the scaler description file for the s800. This file maps channel names to channel numbers, and in addition determines the layout. | The list below is a direct copy of the scaler description file for the s800. This file maps channel names to channel numbers, and in addition determines the layout. | ||
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| Hodo.OR | | Hodo.OR | ||
- | In principle, it is possible to include other signals into the scaler channels that are not used. This requires some manipulation | + | In principle, it is possible to include other signals into the scaler channels that are not used. This requires |
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* Connect the new logic signals into the free input channels of the 1**6-ch CFD CAEN C808.** Follow the output ribbon cable to know the corresponding scaler channel where the new signals from the CFD are sent. | * Connect the new logic signals into the free input channels of the 1**6-ch CFD CAEN C808.** Follow the output ribbon cable to know the corresponding scaler channel where the new signals from the CFD are sent. | ||
- | * Enable the new CFD CAEN C808 channels (if they are not yet enabled): Go to / | + | * Enable the new CFD CAEN C808 channels (if they are not yet enabled): Go to **/ |
- | * Start the scalers display script. You should see the new channels in the display counting. If they are zero, the CFD thresholds may be too high. If that is the case, you should lower them in file **s800cfdini.tcl** (directory / | + | * Start the scalers display script. You should see the new channels in the display counting. If they are zero, the CFD thresholds may be too high. If that is the case, you should lower them in file **s800cfdini.tcl** (directory |