1 / 16

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.

dlorena
Download Presentation

Thermal Testing of TOB/TEC Hybrids at UCSB

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related