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Instrumentation and Controls

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

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Instrumentation and Controls

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  1. Instrumentation and Controls Test Plan Review 17th 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 2nd stage of the cryo coolers • Silicon Diode placed on all 77K surfaces and at the 1st 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

  6. 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.

  7. Control

  8. Control

  9. Stable operation Temperature Monitoring and Heater / Pressure Feedback ON / OFF ON / OFF ON / OFF ON / OFF ON / OFF ON / OFF Fill Line CC 1 CC 2 CC 3 CC 4 Single CC 5 SD27 SD14 SD10 SD11 SD12 SD13 SD15 SD01 SD08 SD06 SD07 SD03 SD16 SD05 SD02 CX05 CX06 CX09 CX07 CX08 Level 3 CX10 CX02 Level 2 SD19 SD23 SD25 Level 1 CX01 Cold Mass CX12 CX11 Radiation Shield SD26 Vacuum Vessel Heater Power Heater Power Pressure

  10. Compressor operation monitoring High He Pressure High He Pressure High He Pressure High He Pressure High He Pressure Low He Pressure Low He Pressure Low He Pressure Low He Pressure Low He Pressure High He Temp High He Temp High He Temp High He Temp High He Temp Oil Temp Oil Temp Oil Temp Oil Temp Oil Temp CC1 CC2 CC3 CC4 CC5 SS Temp In Temp Out Temp In Temp Out Temp In Temp Out Temp In Temp Out Temp In Temp Out Temp In Temp Out Flow Rate External thermocouples for the single stage cooler.

  11. Coil Power supplies and Voltage Tap monitoring and Control Voltage Voltage Voltage Voltage Voltage Ramp Rate Ramp Rate Ramp Rate Ramp Rate Ramp Rate Set Point Set Point Set Point Set Point Set Point Value Value Value Value Value Matching Coil 1 Matching Coil 2 End Coil 1 Centre Coil End Coil 2 VTM1 VTM1 VTM4 VTM5 VTM6 VTM7 VTM8 VTM9 VTM2 VTM2 VTM3 VTL1 VTL2 VTL3 VTL4 VTL5 VTL6 VTL7 VTL8 VTL9 VTL10 VTL11 VTL12 VTL13 VTL14 VTL15 VTL16 Open / Close Open / Close Open / Close 3 Diode Drop 3 Diode Drop 3 Diode Drop 3 Diode Drop 8 Diode Drop 8 Diode Drop Contactor 3 Contactor 2 Contactor 1

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