instrumentation and controls test plan review 17 th february 2012 roy preece (stfc ral)
TRANSCRIPT
Instrumentation and Controls
Test Plan Review
17th 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 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
Sensors
Heaters
Voltage Taps
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.
Control
Control
ON / OFF ON / OFF ON / OFF ON / OFF ON / OFF 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 1 CC 2 CC 3 CC 4 Single
CC 5
Pressure
SD02
SD08
SD14
Vacuum Vessel
Radiation Shield
Cold Mass
Heater Power
SD26
SD25
SD23SD19
Fill
Lin
e
Heater Power
CX11
CX10
CC1 CC2 CC3 CC4 CC5SS
Temp Out
Temp Out
Temp Out
Temp Out
Temp Out
Temp Out
Temp In
Temp In
Temp In
Temp In
Temp In
Temp In
FlowRate
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
Set Point
Coil Power supplies and Voltage Tap monitoring and Control
Matching Coil
1
Matching Coil
2
End Coil 1 Centre Coil End Coil 2
Value
Value
Value
Value
Value
Ramp Rate
Voltage
VTM
1
VTM
2
VTM
3
VTM
4
VTM
5
VTM
6
VTM
8
VTM
9
VTM
7
VTM
1
VTM
2Set Point
Ramp Rate
Voltage
Set Point
Ramp Rate
Voltage
Set Point
Ramp Rate
Voltage
Set Point
Ramp Rate
Voltage
VTL2
VTL9 VTL10
VTL1 VTL4
VTL11VTL12
VTL3 VTL6
VTL13VTL14
VTL5 VTL8
VTL15VTL16
VTL7
Contactor 3
Contactor 2
Contactor 1
Open / Close
Open / Close
Open / Close
3 Diode Drop
3 Diode Drop
3 Diode Drop
3 Diode Drop
8 Diode Drop
8 Diode Drop