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Experimental setup

Combined tests on CAEN OPC performance and FSM are described. The delay on switching ON (OFF) vs the number of HV channels at different OPC refresh time is presented. Experimental setup. Schematic of the CAEN OPC + FSM set up. HV CU. 1. 1.5 s Measured in FSM only 180 DU and one CU.

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Experimental setup

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  1. Combined tests on CAEN OPC performance and FSM are described. The delay on switching ON (OFF) vs the number of HV channels at different OPC refresh time is presented G. De Cataldo, CERN-CH and INFN bari

  2. Experimental setup G. De Cataldo, CERN-CH and INFN bari

  3. Schematic of the CAEN OPC + FSM set up HV CU 1 1.5 s Measured in FSM only 180 DU and one CU 4.7 s (OPC + FSM) OPC refr. rate 500ms 180 HV chs ON 180 0.622 s Measuredby dedicated test with simulated OPC server PVSS OPC client ~ 2.6 s For the CAEN OPC server deduced as difference CAEN OPC server CAEN WRAPPER SY1527 ch G. De Cataldo, CERN-CH and INFN bari

  4. Time to switch ON vs channels numb. G. De Cataldo, CERN-CH and INFN bari

  5. FSM time for 180 ch ON vs OPC refresh time G. De Cataldo, CERN-CH and INFN bari

  6. Recommendations • From these test results there are not conclusive recommendations on the number of channels per control PC. However reference values for the channel switch ON/OFF and for a simple FSM hierarchy are provided. • TRIVIAL EXERCICE : taking into account the present test results and with the help of an extrapolating exercise, to switch ON 384 HV channels (2 complete CAEN crate on the same OPC server with 500 ms of refresh time), with a ramping time of 40 s (2KV/50V/s), about 50 s would be requested for the complete HV operation. In this assumption (realistic for MWPC or gaseous detectors) only the 20% of the time is due to the OPC+FSM performance. • ERROR HANDLING: If the possible severe alarm conditions for few tens of channels produced at the same time (overcurrent, overvoltage….) are protected at the level of the HV boards, then the notification to the FSM within 2 s for the error handling can be deduced from fig. 1. G. De Cataldo, CERN-CH and INFN bari

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