September 30, 2009 CDC Meeting

Meeting Time and Place

Wednesday September 30, 2009 at 10:30am At Jefferson Lab, the meeting will be held in room ARC 426

Connections

To connect from the outside, please use ESNET
1.) ESNET: 8542553
2.) Phone:
+1-800-377-8846 : US
+1-888-276-7715 : Canada
+1-302-709-8424 : International
then enter participant code: 77438230# (remember the "#")

Ground HV Card Through Standoff

Attached is a rough sketch showing the proposed stand-off scheme. [Image:Standoff.pdf|pdf file]

1. ) A 6/32 blind threaded hole is drilled in the endplate.
2. ) A 6/32 set screw is screwed into the hole. We can use conducting epoxy to improve the connection if needed.
3. ) A 1/4 inch electrical standoff with a 6/32 tapped hole is screwed onto the set screw. There are three possible variations on this for the end in contact with the endplate.
   1. ) There is room for the 1/4 inch, nothing specicial
   2. ) There is not quite enough room for the 1/4 inch due to the heads of the feedthrus extending 1/10" above the surface of the plate. We can order a standard 1/4 standoff that has a diameter of 188 for the last .133 inches. This comes from McMaster-Carr.
   3. ) Or we can make in house modifications:
      1. ) we can (in house as needed) taper the end of the standof down to ~188 from 250 so it will fit,
      2. ) we can (in house) as needed remove some material from the head of the feed throughs so that the 1/4 in can reach the endplate.
4. ) A .156 inch hole is drilled through the lucite plate.
5. ) A 6/32 set screw goes through the lucite plate and screws into the standoff.
6. ) Epoxy, or conducting epoxy in placed around the 6/32 set screw.
7. ) A 1/4 inch electrical standoff with blind 6/32 holes is screwed
8. ) The connector is attached to the standoff.

Mounting the HV card

We also would like to propose the standoffs that hold the HV card be on opposite sides of the card, rather than both on the same side. This gives less chance that the card will tilt during installation and removal.
@=== High-voltage board
O Standoff/set screw of installation/removal.

                               O
                              @=============================@
                                                           O