November 1, 2010 CDC Meeting

Meeting Time and Place

Monday November 1, 2010 at 2:30pm 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: 77438230# (remember the "#")

Meeting Purpose

This is a series of meetings to get the CDC drawings finalized and signed. The agenda is a list of all the parts needed in each phase of the project. The initial goal si to go through the first couple of phases and make sure that things are all completed here.

Agenda

1. Frame Assembly Phase. [1]
   1. Endplates.
   2. Inner Shell.
   3. Support Rods.
2. Straw Assembly and Installation Phase.
   1. Strawtubes.
   2. Aluminum Donuts.
   3. Aluminum Feed Thrus.
   4. Plastic Donuts.
   5. Plastic Feed Thrus.
3. Outer-shell installation Phase.
   1. Internal Gas Plumbing.
      1. Gas lines.
      2. Installation position.
      3. Widgets to hold plumbing.
      4. Thermal Couples + wiring.
   2. Outer Shell Assembly.
      1. Outer-shell hubs.
      2. Outer-shell.
      3. Support units (bearings?)
4. Wire Stringing Phase
   1. Wire (to be sent to CMU)
   2. Pin holders
   3. Crimp pins (tool setting)
5. Electrical Connections Phase.
   1. Inner support hub.
   2. Outer support hub.
   3. Swiss-cheese plate.
   4. Wire holders (screw-in).
   5. Connection wires.
   6. Preamplifier supports.
   7. Soldering board.
   8. HV board.
6. Down-stream gas plenum phase.
   1. Rohacell supports.
   2. Gas window.

Minutes

We went through the general assembly drawings through the chamber being strung. The changes identified are in the connecting rods and bolts:

• O-ring groove and o-ring in the ends of the rods.
• A Teflon washer 3 mil over sized in the bolts.
• A small change was discussed to the gas hook-up at the upstream end of the chamber. Rather than a smooth widget, Gary proposed machining out a barbed gas fitting to make that widget.

Discussions were also carried out on the thermal couples that are to be used. Plans call for three in the down-stream gas plenum, three in the gas volume, and three in the upstream plenum. Curtis will email Fernando to see if he has some low-noise suggestions and Naomi will check to see if she is really seeing pickup from the thermal couple wires. Other than the changes above, everyone is good with the drawings and procedures until electrical hook-up.

The next meeting will move on to the gas plenums to try and finalize those.

Other items:

• Plastic parts were shipped and should be at CMU on Tuesday Nov. 2. Some of the pin holders are a little tight on the crimp pins. This may be because there were two pin-holder molds to match the total number of parts.
• 7 spools of wire have been shipped to CMU. This is about 10500 meters and is 75% extra.
• Steve Christo has been away on vacation. Will check on the crimp heads when he gets back.

Action Items

1. Specify thermal couples.
2. Drawings for gas plenums.