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Thermal Testing of TOB/TEC Hybrids at UCSB

This presentation discusses the importance of thermal testing for TOB/TEC hybrids used in the CMS detector, the setup in the clean room, cooling down process, calculations for reaching -20°C, interfacing to a PC, testing software, and the automated test results.

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Thermal Testing of TOB/TEC Hybrids at UCSB

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  1. Thermal Testing of TOB/TEC Hybrids at UCSB Slide 1

  2. Why Thermal Test? The CMS detector will run at –20 C in order to lessen radiation damage to the silicon Slide 2

  3. Why Thermal Test Hybrids? Some Hybrids fail at –20 C • APVs do not output • Hybrid fails to initialize • Noise increases in cold (peltier current?) APV: Analog Pipeline Voltage Mode Chip Slide 3

  4. Set-up in Clean Room Slide 4

  5. Cooling Down How long should/does it take to get to –20? Air Water Flow (14 L/min) Cold chamber Chiller Peltier + Plate Air Flow (0.05 L/min) Slide 5

  6. Simplifying things S= surface area of enclosure (m ) k=thermal conductivity of walls (W/m C) h=convection factor (W/m C) x=thickness of walls (m) Slide 6

  7. Calculating time to -20 First order linear differential equation: Solution: (T(t=0)=295K) Slide 7

  8. Not quite… Calculation says that plate should reach –20 in ~14 minutes. Actual time: ~21 minutes Possible problems: • Unaccounted heat influx through leaks or grounding strips connecting plate to outside • Assumptions made are flawed • Missing term in differential equation Slide 8

  9. Interfacing to a PC: ACDC Slide 9

  10. Testing Software: ARCSAPV Readout Control Software Communicates With ACDC via TCP/UDP Slide 10

  11. What are we testing for? Shorted channels: On each clock, charge injected into every 8th channel. Shorted channels share, ADC amplitude is diminished. 128 Channels per APV -6 APV hybrids: 768 -4 APV hybrids: 512 Slide 11

  12. What are we testing for? Open Channels: Inject charge through Capacitive coupling of pitch adapter to antenna carrying TTL Pulse Antenna Pitch Adapter Slide 12

  13. With Pulser Operational…. • Opens are also detectable in Pedestal & Noise Test Plucked Bonds Slide 13

  14. Thermal Cycle Test “One Button” test Three Sets of Tests: • Pedestal & Noise • Pulser • Short Detection Slide 14

  15. Automated Test Results Final Report After Thermal Cycle Test: Lists -Shorts -Opens -Noisy Channels Slide 15

  16. Testing & Replicating UCSB Cold Box ready for full scale testing: ~28 hybrids per day Fermilab Cold Box near completion Mexico City Cold Box next on the list Slide 16

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