S800 Documentation

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electronics [2013/12/10 15:24]
pereira 		electronics [2013/12/10 15:35]
pereira
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 ===== Trigger ===== ===== Trigger =====
 +The main purpose of the trigger is to implement a coincidence between the S800 focal-plane fast timing scintillator [[Detectors#Plastic scintillators|E1]] and a secondary detector principally located at the target location.
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 +The trigger logic is implemented in a LeCroy 2367 Universal Logic Module (ULM) by means of its XC4000E Xilinx FPGA. The main motivations for implementing the trigger logic in an FPGA driven module are the following: 
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 +  - Simplify cabling and setup of the trigger 
 +  - Reduce the number of modules used to implement the trigger 
 +  - Ability to remotely control and inspect trigger signals 
 +  - Ability to save and restore the trigger configuration 
 +  - Direct visualization of the trigger logic and configuration 
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 +Probably the most appealing feature of this module is the possibility to remotely control the trigger timing and configuration while beam is present in the vault, since most experiments are nowadays locating their electronics close to the detectors. 
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 ===== General description ===== ===== General description =====
 The S800 trigger source comes from the fast timing scintillator [[Detectors#Plastic scintillators|E1]] located in the focal plane. This trigger can be combined with triggers from other detectors or arrays in order to form coincidences. This is often a mandatory requirement when the trigger rate of the S800 alone (S800 singles) is too high for the data acquisition and the resulting dead time is prohibitive.  The S800 trigger source comes from the fast timing scintillator [[Detectors#Plastic scintillators|E1]] located in the focal plane. This trigger can be combined with triggers from other detectors or arrays in order to form coincidences. This is often a mandatory requirement when the trigger rate of the S800 alone (S800 singles) is too high for the data acquisition and the resulting dead time is prohibitive. 
  
-Because the USB-based S800 data acquisition uses independent crate controllers that perform the readout in parallel, time stamping and busy schemes are incorporated in the trigger to synchronize events and insure no trigger is generated while readout sequences are being executed. Because of this modularity, adding an external data acquisition system (typically from an external detector), is straightforward. + 
  
  
electronics.txt · Last modified: 2023/10/16 08:25 by noji

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