1. Instrumentation and Controls Test Plan Review 17 th February 2012 Roy Preece (STFC RAL)

2. Instrumentation –Senors Silicon Diode and Cernox with the bobbin style termination. Cernox placed at 4K surfaces on the Helium chamber and 2 nd stage of the cryo coolers Silicon Diode placed on all 77K surfaces and at the 1 st stage of the cryo coolers For the 77K shield bore flush mount LR type Silicon Diode sensors have been used. –Heaters Heater pack on the fill line at the lowest point to boil off excess LN2 during pre-cool Heater pack on the bottom surface of the Helium chamber to be used as a pressure raiser. Each heater pack has a Cernox sensor close to act as thermal interlock and feedback. –Voltage taps Internal taps at the internal resistor / diode pack External at the upper and lower points of the HTS leads. –Pressure gauge Fitted at the vent tower and will act in the Pressure / Heater feedback Fitted to the fill line tower to ascertain an thermo-acoustic oscillations

3. Sensors

4. Heaters

5. Voltage Taps

9. Control Control system designed and assembled by the Daresbury group Pre Cool –Monitoring of all sensors, Pressure and Vacuum –Boil off of the residual LN2 using the heater control He Cool –Monitoring of the sensors, Pressure, He Level sensors, Vacuum, Cryo Cooler compressors and water flow. Operation at temperature –Monitoring of the sensors, Pressure, He Level sensors, Vacuum, Cryo Cooler compressors and water flow. –Control of the He pressure raising circuit. Approximatly 100 mBar over pressure. Energising the magnet and operation. –All monitoring and control of the heaters to maintain the slight over-pressure. –Interaction with the Power supply racks and DAQ / Quench protection system.

10. Control

12. ON / OFF SD16 CX05 SD11 SD05 CX06 SD12 SD06 CX07 SD13 SD07 CX08 SD27 SD01 CX09 SD15 SD03 SD10 Stable operation Temperature Monitoring and Heater / Pressure Feedback CX01 CX02 CX12 Level 1 Level 2 Level 3 CC 1CC 2CC 3CC 4SingleCC 5 Pressure SD02 SD08 SD14 Vacuum Vessel Radiation Shield Cold Mass Heater Power SD26 SD25 SD23SD19 Fill Line Heater Power CX11 CX10

13. CC1CC2CC3CC4CC5 SS Temp Out Temp Out Temp Out Temp Out Temp Out Temp Out Temp In Temp In Temp In Temp In Temp In Temp In Flow Rate High He Pressure Low He Pressure High He Temp Oil Temp High He Pressure Low He Pressure High He Temp Oil Temp High He Pressure Low He Pressure High He Temp Oil Temp High He Pressure Low He Pressure High He Temp Oil Temp High He Pressure Low He Pressure High He Temp Oil Temp External thermocouples for the single stage cooler. Compressor operation monitoring

14. Set Point Coil Power supplies and Voltage Tap monitoring and Control Matchin g Coil 1 Matchin g Coil 2 End Coil 1Centre CoilEnd Coil 2 Valu e Ramp Rate Voltage VTM1VTM2VTM3VTM4VTM5VTM6VTM8VTM9VTM7VTM1VTM2 Set Point Ramp Rate Voltage Set Point Ramp Rate Voltage Set Point Ramp Rate Voltage Set Point Ramp Rate Voltage VTL2 VTL9VTL10 VTL1VTL4 VTL11VTL12 VTL3VTL6 VTL13VTL14 VTL5VTL8 VTL15VTL16 VTL7 Contactor 3Contactor 2 Contactor 1 Open / Close 3 Diode Drop 8 Diode Drop