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

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