AMSTIM Meeting Cern, July28August 1, 2003

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AMS-TIM MeetingCern, July28-August 1, 2003
AMS Tracker Thermal Control System
(TTCS) Electronics Johannes van Es, Carlo Rens,
Jacob Jaarsma, Aswin Pauw, Gerrit van Donk, Ad
Delil (NLR), Bart Verlaat (NIKHEF)

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Objectives

• AMS Tracker Objectives
• Keep silicon wafers within thermal requirements
  with a temperature stability of 3 ºC per orbit.
• Keep hybrid circuits within thermal requirements.
• NLR Experiment Objective
• Perform two-phase flow experiments when no AMS
  experiments are done.

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TTCS Overview

• Two redundant carbon dioxide two-phase loops
  (both capable to fulfil the AMS-Tracker req's)
• Primary loop (with valve controls, experiment
  by-pass, LFMs)
• Secondary loop (current status, no valves, no
  experiment by-pass, no LFMs)

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Primary TTCS (TTCSP)
Top Evaporator
Ram Heat Pipe Radiator
Wake Heat Pipe Radiator
Primary TTCS Component Box (TTCBP)
Heat Exchanger
Pre heater
Tracker Hybrids
APS
LFM
Zone heaters (CGS)
Zone heaters (CGS)
Pumps
LFM
Bottom Evaporator
Wake Condenser
RAM Condenser
DPS
Accu- mulator
Phase Change Material (PCM)
Pre heater
LFM
2-Way Valve (VLV)
Components inside this profile are thermally
mounted to the TTCB structure
Sensors LFM Liquid Flow Meter, DPS
Differential Pressure Sensor APS Absolute
Pressure Sensor VQS Vapor Quality Sensor
Centrifugal pump (PMP) with integrated check valve
Thermo Electric Cooler (TEC)
Electrical Heater (HTR)
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Secondary TTCS (TTCSS)
Top Evaporator
Ram Heat Pipe Radiator
Wake Heat Pipe Radiator
Secondary TTCS Component Box (TTCBS)
Heat Exchanger
Pre heater
Tracker Hybrids
APS
Zone heaters (CGS)
Zone heaters (CGS)
Pumps
Bottom Evaporator
Wake Condenser
Ram Condenser
Accu- mulator
Phase Change Material (PCM)
Pre heater
2-Way Valve (VLV)
Sensors LFM Liquid Flow Meter, DPS
Differential Pressure Sensor APS Absolute
Pressure Sensor VQS Vapor Quality Sensor
Components inside this profile are thermally
mounted to the TTCB structure
Centrifugal pump (PMP) with integrated check valve
Thermo Electric Cooler (TEC)
Electrical Heater (HTR)
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TTCS Electronics overview
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TTCS control layout

• TTCE full redundant for primary and secondary
  loop
• Pure cold redundancy between loops
• High level control loops on mission computer
• complex temperature/pre-heaters control
• experiment heaters control
• valve control
• Low level simple control available for peltiers
  and pre-heaters on sensor actuator board

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TTCE Block diagram
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Sensor actuator board

• Temperature pressure sensor interface
• Proven design from earlier NLR space project
• Valve
• On/Off (TBC)
• Experiment heater interface
• 28V on/off control
• Peltier / pre heater interface
• Thermoelectric Cooler Controller (PWM control)
• USCM interface
• 16x digital I/O 8x address
• Local Control
• FPGA

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Component selection

• Selection Criteria
• From PPL
• SEE free
• Add latch-up protection
• Thermoelectric Cooler Controller Candidates
• ADN8830, LTC1923, MAX1978
• Preferred FPGA
• Xilinx XQR4000XL with XQ1701L (PROM)

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Conclusion

• Loop lay-out is frozen (number of valves etc.).
• Components selection and freezing of electronics
  interfaces (80 finished).
• Redundancy concept per component is selected
  (including mapping to hot/cold USCM's and/or
  actuator boards) (75 finished).
• Currently detailed design activities are in
  progress.