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Module Metrology

Module Metrology. Bart and Peter have been learning to use the RAL Smartscope ZIP 250. BAD GUYS. Liv13. Previously operated without cooling (prompted Bart to make Interlock box). Previously operated without cooling (during removal from UKDC1 Stavelet). GOOD GUYS.

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Module Metrology

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  1. Module Metrology Bart and Peter have been learning to use the RAL Smartscope ZIP 250

  2. BAD GUYS Liv13 Previously operated without cooling (prompted Bart to make Interlock box) Previously operated without cooling (during removal from UKDC1 Stavelet)

  3. GOOD GUYS These modules are fine. They have been kept cool whenever operated. => Excessive bow must be a product of uncooled operation. Anyone know why?

  4. UKSP2 Chain of modules SP Stavelet using STAR PCBs from Ashley, Power hookupwith wires

  5. UKSP2 Power through 2mm connectors to facilitate studies of differing chain combinations CAM2 LIV21 LIV12 CAM4

  6. IV curves @ 20C FZ1 Sensors FZ2 Sensors

  7. UKSP2, 9.5A 250V, 4 ON, 3PG@2fC2272-11 48.1C 46.4C 49.1C 42.4C 47.4C 43.4C 45.7C 46.9C

  8. Special Feature: CAM1 built with one unshielded hybrid Extra DTN occupancy at specific locations, related to use of non-blind vias. (Easily avoided in future submissions.) 0.5fC Threshold

  9. DTN: Four modules, single chain 2272-14 0 NS 1 2 3 4 5 6 7

  10. DTN: M3 alone 2272-25 0 NS 1 2 3 4 5 6 7 => Significant Improvement!

  11. DTN: Four modules, two chains 2276-9 0 NS 1 2 3 4 5 6 7 => Improvement Maintained!

  12. Interpretation & Analysis • M3 is fine when operated on its own • Suggests the “hollow square” is perfectly adequate for referencing purposes • M3 is fine when all modules are operating as long as it has its own power supply • Suggests the “hollow square” is perfectly adequate for shielding purposes • Yet M3 is not fine when operated in the same chain as the others • Suggests that CM is developing along the SP chain • Quick trials with caps and wires indicated that coupling the shield / referencing square to EoS ground could help • Time to implement this properly

  13. DTN: Four modules with CMR caps 2279-1 0 NS 1 2 Implementation 10mF 3 4 10mF 5 6 10mF 7 => Looks great. Has this affected ENC noise? To EoS GND

  14. UKSP2, 9.5A 250V, 4 ON, 3PG@2fC2279-11 48.1C 46.4C 49.1C 42.2C 47.3C 43.4C 45.6C 46.8C

  15. Difference between 2279-11 and 2272-11 (4on, 9.5A, 250V, with and without CMR caps)

  16. DTN at 0.5fC Module 0 Module 1 Basically empty!

  17. DTN at 0.5fC Module 2 Module 3 Basically empty!

  18. DTN at 0.4fC Module 0 Module 1 Not too bad!

  19. DTN at 0.4fC Module 2 Module 3 Not too bad!

  20. Preliminary Conclusions • CofM STAR SP works well • ENC values within range expected due to temperature variation • We understand how to make the reference ties within a module. • Hollow square is adequate • The shield is probably not required • more work to do on this • CM develops along the SP chain • can be removed by adding capacitors to LVDS screen • May or may not be sufficient in a longer chain

  21. Perhaps we actually understand what we’re doing!

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