Difference between revisions of "June 30, 2009 CDC Meeting"

Revision as of 15:00, 30 June 2009

Meeting Time and Place

Tuesday June 30 2009 at 11:00am At Jefferson Lab, the meeting will be held in room ARC 428

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: 39527048# (remember the "#")

Agenda

1. CDC Endplate Drawings Drawings
2. CDC Donut/Feedthru Drawings Donuts

Notes

• CDC Front Disc
  • Section B-B, what is the small step? Small step to engage the inner hub.
  • What will hold the inner tube to the end plates? Without the gas plenum, there is 3/8" on radius and after the polycarbonate, at least that much.
  • OPEN How thick is ring on which inner tube is glued?
  • Threaded inserts? These are for screwing in the gas plenum. Used in conjunction with the above mentioned groove to position plenum.
• Holes Sizes

• Crimp pin to plastic insert - CMU will think about the fit.
  • Plastic inserts are all the same, make go 0.1" past the feed-thru.(Looks like 1.2).
  • Gary wants a slip interference fit. line-to-line fit.

• Plastic Insert
  • Want the counter-bored shoulder.

• Donuts and feed through both have glue port and vent.
• Feed through groove moved from 0.19 to 0.25" from tip on both Noryl and Al.
• Depth of drilled holes changes (Noryl is 0.56", AL is 0.7").
• Material for injection molding, HallB used glass-filled Noryl, What did Hall A use, does Eugene know?
• Get Mac-Master Carr part & grade for Noryl for donuts and feed thrus.

Questions/notes on the end plates

• Back disc (without isometric view)
  • Point 5: counter-bore for stereo layers, why so large diameter (.578), while diameter of feed trough is .500?
  • Section B-B: why is the groove so deep (0.080 = 1/3 of the plate thickness)
  • What about the inner gas shell?
  • Is there a label foreseen to mark the start of each layer?

• Back disk (with isometric view)
  • We assume that inner/outer gas shell is not drawn?
  • The holes:
    • What are the 2 top holes (outside gas volume) for? (2x .265)
    • 2 holes at +-50 degrees outside gas volumes are fiducials?
    • 12 holes starting at 15 degrees (I count counterclockwise) are for rods?
    • 6 remaining holes are for getting the gas inlets to the downstream end-plenum? Why are they so "far" away from the rods? We thought they are going to be cabletight to the rods? Why is the diameter not larger?
  • Are there standoffs for the mylar sheet?

• Front disc (without isometric view)
  • [ADDRESSED] section B-B: inner plexiglass holder -> why the step
  • [OPEN QUESTION] inner shell?
  • Is there nothing foreseen for (grounding) standoffs?

• Front disc (with isometric view)
  • The holes:
    • what are the two holes on to, outside the gas volume?
    • 6 holes starting at 0 degrees outside the gas volume are fiducials?
    • 6 big holes at the top are for gas exaust (main volume to outside plenum)?
    • 12 holes starting at 15 degrees are rods?