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Miscellaneous News

Miscellaneous News. From RAL Peter W Phillips. Sensirion Adaptor & DCS display. Stable when SCTDAQ not running, occasional DCS crashes when running both under study. Sensirion readout also in SCTDAQ. Purchased additional PSU for Stave250. TSX1820P Single channel 18V 20A GPIB £791.

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Miscellaneous News

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  1. Miscellaneous News From RAL Peter W Phillips

  2. Sensirion Adaptor & DCS display Stable when SCTDAQ not running, occasional DCS crashes when running both under study

  3. Sensirion readout also in SCTDAQ

  4. Purchased additional PSU for Stave250 • TSX1820P • Single channel 18V 20A • GPIB • £791 • CPX400DP • Dual channel • Each 20A below 20V • GPIB, USB, LAN • £975 Taken together, we can now service all three Stave250 power segments

  5. 16 Channel (4*4) HVMUX Layout

  6. UKSP2 Some new Stuff Peter W Phillips, RAL

  7. UKSP2 Power initially through 2mm connectors to facilitate studies of differing chain combinations Chain of Modules CAM2 LIV21 LIV12 CAM4

  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. 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 • Open Questions • How does “4on” compare with “1on”? • How do wirebonds change things?

  10. UKSP2, TSX1820P 9.5A 250V, 4 ON, 3PG@1fCChain made by wires, 2280-6 48.8C 47.5C 49.8C 43.0C 48.0C 44.6C 47.5C 47.5C

  11. UKSP2, TSX1820P 9.5A 250V, 1 ON, 3PG@1fCdirect connection by wires, composite 39.7C 39.6C 40.6C 39.1C 39.2C 40.0C 38.0C 39.3C

  12. UKSP2, TSX1820P 9.5A 250V, 4 ON, 3PG@1fCdENC (individual-all), (2280-6 - composite) 9.1C 7.9C 9.2C 3.9C 8.8C 4.6C 9.5C 8.2C

  13. UKSP2, TSX1820P 9.5A 250V, 4 ON, 3PG@1fCChain made by bonds, 2330-6 49.2C 47.6C 50.3C 43.1C 48.6C 44.6C 47.0C 47.9C

  14. UKSP2, TSX1820P 9.5A 250V, 4 ON, 3PG@1fCdENC (wires-bonds), (2280-6 – 2330-6) -0.4C -0.1C -0.5C -0.1C -0.6C 0C -0.5C -0.4C

  15. UKSP2, TSX1820P 9.5A 250V, 4 ON, 3PG@1fCChain made by wires & bonds, 2333-6 48.2C 46.8C 49.4C 42.5C 47.7C 43.9C 46.0C 45.7C

  16. DTN

  17. What if I try the new PSU? • CPX400DP • Dual channel • Each 20V 20A or 60V 7A • GPIB, USB, LAN • £975

  18. UKSP2, CPX400DP 9.5A 250V, 4 ON, 3PG@1fCChain made by bonds, 2336-21 48.7C 47.1C 49.8C 42.7C 48.2C 44.2C 48.2C 47.4C

  19. dENC TSX1820P (wires) – CPX400DP (bonds), • 9.5A 250V, 4 ON, 3PG@1fC (2280-6 – 2336-21) 0.1C 0.4C 0C -0.3C -0.2C 0.4C -0.7C 0.1C

  20. DTN

  21. Summary and Plans • With the new PSU, it looks just as good with bonds as it did previously with wires • Need to look at the outputs of the two PSU to understand this • Are the inductors helping? • Remove some to find out • Is the STAR helping? • Replace one board by Brookhaven “non STAR” equivalent

  22. BACKUP

  23. 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

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

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

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

  27. 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

  28. 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

  29. 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

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

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