The MVD HV distribution boards are passive boards that map 50-pin ribbons
coming from the LeCroy supply onto 2 ribbons going up to the MVD. There is
one such module for each quadrant of the MVD. The front-panel connector
layout can beseen below. We will allocate a small amount of board space to
each channel, in case we need to add noise filter components. This is
schematically indicated on the right:
| In the drawing on the right, the HV for one of the 42 channels enters from the left on the connector, and leaves via the connector on the right. If the HV is clean enough, the capacitors and resistor will not be installed, and the jumper (dotted line) will be installed. | 
ps version |
MVD HV Distribution VME Module
Jan Boissevain/Hubert van Hecke
Purpose:
This card maps signals from the LeCroy HV power supply to a MVD motherboard.
Four Distribution cards are required to support the four MVD motherboards.
Jumpers are provided to allow module to support a fully populated or a
partially populated MVD while minimizing the number of LeCroy HV modules
required. The LeCroy HV module has 12 independent channels mapped to two
output connectors each of which has 6 HV channels with a common return. For
the fully populated MVD, 42 HV signals are required (7 groups of six => 7
returns) or 3.5 modules. The partially populated MVD requires 34 HV signals
or 3 modules.
Silicon Bias Pin Assignments
Maximum of 42 silicon detectors/quadrant => 42 bias + 42 bias returns. Low
current requirement (130V Max), so use shielded 25 mil pitch cable and IDC
connectors. These connectors are rated for 500Vrms at sea level. Require 2
connectors, 1 ea. 50 contact connector and 1 ea. 40 contact connector. These
cables go to the power distribution box.
Motherboard Interface Brd LeCroy HV Module Silicon Bias Connector 1 60 Cont Header 50 contact header: 3M 81050-660X0X 1. group 1, mcm 1, silicon bias 1 module 1, conn 1, 1 2. group 1, mcm 1, silicon bias return 7 module 1, conn 1, G 3. group 1, mcm 2, silicon bias 2 module 1, conn 1, 2 4. group 1, mcm 2, silicon bias return 7 module 1, conn 1, G 5. group 1, mcm 3, silicon bias 3 module 1, conn 1, 3 6. group 1, mcm 3, silicon bias return 7 module 1, conn 1, G 7. group 1, mcm 4, silicon bias 4 module 1, conn 1, 4 8. group 1, mcm 4, silicon bias return 8 module 1, conn 1, G 9. group 1, mcm 5, silicon bias 5 module 1, conn 1, 5 10. group 1, mcm 5, silicon bias return 8 module 1, conn 1, G 11. group 1, mcm 6, silicon bias 6 module 1, conn 1, 6 12. group 1, mcm 6, silicon bias return 8 module 1, conn 1, G 13. group 2, mcm 1, silicon bias 9 module 1, conn 2, 1 14. group 2, mcm 1, silicon bias return 15 module 1, conn 2, G 15. group 2, mcm 2, silicon bias 10 module 1, conn 2, 2 16. group 2, mcm 2, silicon bias return 15 module 1, conn 2, G 17. group 2, mcm 3, silicon bias 11 module 1, conn 2, 3 18. group 2, mcm 3, silicon bias return 15 module 1, conn 2, G 19. group 2, mcm 4, silicon bias 12 module 1, conn 2, 4 20. group 2, mcm 4, silicon bias return 16 module 1, conn 2, G 21. group 2, mcm 5, silicon bias 13 module 1, conn 2, 5 22. group 2, mcm 5, silicon bias return 16 module 1, conn 2, G 23. group 2, mcm 6, silicon bias 14 module 1, conn 2, 6 24. group 2, mcm 6, silicon bias return 16 module 1, conn 2, G 25. group 3, mcm 1, silicon bias 17 module 2, conn 1, 1 26. group 3, mcm 1, silicon bias return 23 module 2, conn 1, G 27. group 3, mcm 2, silicon bias 18 module 2, conn 1, 2 28. group 3, mcm 2, silicon bias return 23 module 2, conn 1, G 29. group 3, mcm 3, silicon bias 19 module 2, conn 1, 3 30. group 3, mcm 3, silicon bias return 23 module 2, conn 1, G 31. group 3, mcm 4, silicon bias 20 module 2, conn 1, 4 32. group 3, mcm 4, silicon bias return 24 module 2, conn 1, G 33. group 3, mcm 5, silicon bias 21 module 2, conn 1, 5 34. group 3, mcm 5, silicon bias return 24 module 2, conn 1, G 35. group 3, mcm 6, silicon bias 22 module 2, conn 1, 6 36. group 3, mcm 6, silicon bias return 24 module 2, conn 1, G 37. group 4, mcm 1, silicon bias 25 module 2, conn 2, 1 38. group 4, mcm 1, silicon bias return 31 module 2, conn 2, G 39. group 4, mcm 2, silicon bias 26 module 2, conn 2, 2 40. group 4, mcm 2, silicon bias return 31 module 2, conn 2, G 41. group 4, mcm 3, silicon bias 27 module 2, conn 2, 3 42. group 4, mcm 3, silicon bias return 31 module 2, conn 2, G 43. group 4, mcm 4, silicon bias 28 module 2, conn 2, 4 44. group 4, mcm 4, silicon bias return 32 module 2, conn 2, G 45. group 4, mcm 5, silicon bias 29 module 2, conn 2, 5 46. group 4, mcm 5, silicon bias return 32 module 2, conn 2, G 47. group 4, mcm 6, silicon bias 30 module 2, conn 2, 6 48. group 4, mcm 6, silicon bias return 32 module 2, conn 2, G 49. ((spare)) 50. ((spare)) Silicon Bias Connector 2 Interface Brd LeCroy HV Module 40 contact header:3M 81040-660X0X 60 Cont Header 1. group 5, mcm 1, silicon bias 33 module 3, conn 1, 1 2. group 5, mcm 1, silicon bias return 39 module 3, conn 1, G 3. group 5, mcm 2, silicon bias 34 module 3, conn 1, 2 4. group 5, mcm 2, silicon bias return 39 module 3, conn 1, G 5. group 5, mcm 3, silicon bias 35 module 3, conn 1, 3 6. group 5, mcm 3, silicon bias return 39 module 3, conn 1, G 7. group 5, mcm 4, silicon bias 36 module 3, conn 1, 4 8. group 5, mcm 4, silicon bias return 40 module 3, conn 1, G 9. group 5, mcm 5, silicon bias 37 module 3, conn 1, 5 10. group 5, mcm 5, silicon bias return 40 module 3, conn 1, G 11. group 5, mcm 6, silicon bias 38 module 3, conn 1, 6 12. group 5, mcm 6, silicon bias return 40 module 3, conn 1, G 13. group 6, mcm 1, silicon bias 41 module 3, conn 2, 1 14. group 6, mcm 1, silicon bias return 47 module 3, conn 2, G 15. group 6, mcm 2, silicon bias 42 module 3, conn 2, 2 16. group 6, mcm 2, silicon bias return 47 module 3, conn 2, G 17. group 6, mcm 3, silicon bias 43 module 3, conn 2, 3 18. group 6, mcm 3, silicon bias return 47 module 3, conn 2, G 19. group 6, mcm 4, silicon bias 44 module 3, conn 2, 4 20. group 6, mcm 4, silicon bias return 48 module 3, conn 2, G 21. group 6, mcm 5, silicon bias 45 module 3, conn 2, 5 22. group 6, mcm 5, silicon bias return 48 module 3, conn 2, G 23. group 6, mcm 6, silicon bias 46 module 3, conn 2, 6 24. group 6, mcm 6, silicon bias return 48 module 3, conn 2, G 25. group 7, mcm 1, silicon bias 49 module 4, conn 1, 1 26. group 7, mcm 1, silicon bias return 55 module 4, conn 1, G 27. group 7, mcm 2, silicon bias 50 module 4, conn 1, 2 28. group 7, mcm 2, silicon bias return 55 module 4, conn 1, G 29. group 7, mcm 3, silicon bias 51 module 4, conn 1, 3 30. group 7, mcm 3, silicon bias return 55 module 4, conn 1, G 31. group 7, mcm 4, silicon bias 52 module 4, conn 1, 4 32. group 7, mcm 4, silicon bias return 56 module 4, conn 1, G 33. group 7, mcm 5, silicon bias 53 module 4, conn 1, 5 34. group 7, mcm 5, silicon bias return 56 module 4, conn 1, G 35. group 7, mcm 6, silicon bias 54 module 4, conn 1, 6 36. group 7, mcm 6, silicon bias return 56 module 4, conn 1, G 37. (spare) 38. (spare) 39. (spare) 40. (spare) In the case where the MVD is partially populated - the start up situation for certain, the mapping is as follows: Silicon Bias Connector 2 Interface Brd LeCroy HV Module 40 contact header:3M 81040-660X0X 60 Cont Header 1. group 5, mcm 1, silicon bias 33 module 3, conn 1, 1 2. group 5, mcm 1, silicon bias return 39 module 3, conn 1, G 3. group 5, mcm 2, silicon bias 34 module 3, conn 1, 2 4. group 5, mcm 2, silicon bias return 39 module 3, conn 1, G 5. group 5, mcm 3, silicon bias 41 spare connector, 1 6. group 5, mcm 3, silicon bias return 47 spare connector, G 7. group 5, mcm 4, silicon bias 42 spare connector, 2 8. group 5, mcm 4, silicon bias return 47 spare connector, G 9. group 5, mcm 5, silicon bias 37 module 3, conn 1, 5 10. group 5, mcm 5, silicon bias return 40 module 3, conn 1, G 11. group 5, mcm 6, silicon bias 38 module 3, conn 1, 6 12. group 5, mcm 6, silicon bias return 40 module 3, conn 1, G 13. group 6, mcm 1, silicon bias 35 module 3, conn 1, 3 14. group 6, mcm 1, silicon bias return 39 module 3, conn 1, G 15. group 6, mcm 2, silicon bias 36 module 3, conn 1, 4 16. group 6, mcm 2, silicon bias return 40 module 3, conn 1, G 17. group 6, mcm 3, silicon bias 43 spare connector, 3 18. group 6, mcm 3, silicon bias return 47 spare connector, G 19. group 6, mcm 4, silicon bias 44 spare connector, 4 20. group 6, mcm 4, silicon bias return 48 spare connector, G 21. group 6, mcm 5, silicon bias 45 spare connector, 5 22. group 6, mcm 5, silicon bias return 48 spare connector, G 23. group 6, mcm 6, silicon bias 46 spare connector, 6 24. group 6, mcm 6, silicon bias return 48 spare connector, G 25. group 7, mcm 1, silicon bias 49 module 4, conn 1, 1 26. group 7, mcm 1, silicon bias return 55 module 4, conn 1, G 27. group 7, mcm 2, silicon bias 50 module 4, conn 1, 2 28. group 7, mcm 2, silicon bias return 55 module 4, conn 1, G 29. group 7, mcm 3, silicon bias 51 module 4, conn 1, 3 30. group 7, mcm 3, silicon bias return 55 module 4, conn 1, G 31. group 7, mcm 4, silicon bias 52 module 4, conn 1, 4 32. group 7, mcm 4, silicon bias return 56 module 4, conn 1, G 33. group 7, mcm 5, silicon bias 53 module 4, conn 1, 5 34. group 7, mcm 5, silicon bias return 56 module 4, conn 1, G 35. group 7, mcm 6, silicon bias 54 module 4, conn 1, 6 36. group 7, mcm 6, silicon bias return 56 module 4, conn 1, G 37. (spare) 38. (spare) 39. (spare) 40. (spare)