1. CEDAR PMT Array DCS (Tim)

2. Summary Summary of DCS monitored parameters based on original scheme – Major part of heat dissipation in electronics / PMTs at each light guide – Recent developments (removal of pre-amps and provision of local NINO boards needs some consideration Currently just a ‘monitoring’ system – Any control (eg. chiller) set manually or by dedicated systems (eg. Huber chiller control s/w) 12/12/20112CEDAR DCS

3. DCS & DSS Assumptions – Some software / hardware system exists to log range of parameters of different types. – Monitored data can be displayed via on-screen panels. – Monitored data logged at intervals to storage – Alarm events Can have different levels of severity Pass through into data stream Require operator to RESET – There exists a separate Detector Safety System Prevents failures causing BIG PROBLEMS! 12/12/20113CEDAR DCS

4. CEDAR PMT ARRAY DCS 12/12/20114CEDAR DCS

5. Evolution Removal of pre-amps from light-guide arrays does not eliminate all heat sources (PMTs & custom PMT bases) – Still need (would like) temperature sensor at each light guide position (need to think about location) Local NINO boards – Assume these are mounted within the PMT array enclosure but separated from the Light-guides (eg. on the sides). Assume – Power ~ 30 mW/PMT channel = 8W per side – Two boards – One 4-wire T sensor per board – 4 extra 4 wire T sensors 12/12/20115CEDAR DCS

6. Inventory of Monitored Parameters ParameterFormatCount CEDAR Gas Pressure2 wire V1 CEDAR Temp4 wire T1 PMT Encl. N2 Flow2 wire V2 PMT Encl. Pressure2 wire V2 PMT Encl. RH2 wire V2 PMT Encl. Temp4 wire T4 PMT Encl. Coolant Inlet Temp4 wire T2 PMT Encl. Coolant Outlet Temp4 wire T2 PMT Light Guide Temp4 wire T8 NINO Board Temp4 wire T4 Chiller Outlet Temp4 wire T1 Chiller Inlet Temp4 wire T1 Chiller Outlet Pressure2 wire V1 Chiller Inlet Pressure2 wire V1 Chiller Flow2 wire V1 TypeCount 4 wire T23 2 wire V10 12/12/20116CEDAR DCS

7. Alarms Critical – cause immediate power down of all LV & HV systems & automatic call to expert – Chiller Flow LOW – Chiller Outlet Pressure LOW or HIGH – Chiller Outlet Temp LOW or HIGH – PMT Encl. N2 Flow LOW (x2) Warning - – Any (PMT Encl. Temp – CEDAR Temp) LOW or HIGH – Any (PMT Light Guide Temp – CEDAR Temp) LOW or HIGH – CEDAR gas pressure LOW or HIGH 12/12/20117CEDAR DCS

8. DSS May be more relevant for operation with H2 – but should think about it now Should be a stand-alone system separate from DCS but should also send signal to DCS A DSS alarm should result in an (automated) action which makes the system safe (primary concern is human safety) DSS Inputs – H2 concentration within PMT array enclosures (2) – Enclosure door HV interlock (2) – ? 12/12/20118CEDAR DCS

9. Remarks Preliminary set of monitoring points defined Need to review to make sure it’s the right list No local DCS expertise – Need advice on DCS signal input modularity and types – Need software support to configure DCS databases & develop display panels, messages, alarm screens, etc.. Would need DCS system operational locally during assembly of PMT arrays to check out individual sensor performance and to estimate suitable monitoring point measurement frequencies. 12/12/20119CEDAR DCS