FDC Weekly Meeting
Date: December 20, 2006
Participants: Daniel, Brian, Tim, Chuck, Roger, Fernando, Elke, Kim
Next Meeting: Wednesday, January 3, 2007 @ 1:30 p.m. (tentative)
- Brian brought one each of the blank G10 and CH2 frames that have been constructed for the cathode mechanical construction effort. We studied the floppiness and the basic properties. - We discussed an option to use carbon fiber frames for the spacers that do not have o-rings (as this is hard to machine). This choice will have roughly 1/2 the mass for a given thickness compared to G10, but costs a factor of several more. Brian is working to get a realistic quote for these rings. - We are still waiting for feedback from Zisis and David regarding the allowable material thickness in the annulus before making a final design decision regarding material choices. - The current annulus I.D. is 970 mm and the O.D. is 1198 mm. These number are still in flux somewhat. At the current time Roger and Kim have defined the layout of the STB board geometries. The HVTB geometries will be the same as the STBs.
- Fernando has been working on the preamp daughter boards and work is still ongoing. He is working to make the boards as small as possible. Once this design is finalized and the position for the connector is finalized, Roger and Kim will work to layout the traces and final component locations. - The current design of the radial extent of the daughter boards is 66 mm. - Based on our use of 4-layer boards for the wire plane, Roger is confident that we should have enough room for everything to safely fit on the annulus in its current size. - Fernando brought a sample of the daughter board connector that he is planning on using. This is a surface-mount connector with plastic feet that go into the board to give it stability. The thickness of the connector is 5.44 mm, which was actually the thinnest that he could find. It turns out that this connector thickness dictated the half-gap in the chambers!
- The FDC budget for CD-2 has been completed and was turned in for internal (collaboration) review. Daniel will send it around for folks to comment on. Everyone should look over the sections that they are responsible for to make sure that things are O.K.. - The budget item for winding the wire planes has not been finalized. We are in negotiations with Karen Kephart at FNAL where we plan to have the planes wound. - Now that we know roughly where the surface-mount components will go, Brian will talk to Karen about possibility of winding planes after the components have been soldered on.
- Brian is working to make sure that all of the hardware and materials needed to begin construction of a cathode-sandwich mechanical mockup are in-hand (or on order) before the end of the year shut down. - We have the G10 and CH2 frames in our possession, as well as the Rohacell. The kapton will come from Steve Christo and the aluminized mylar is on order. We will be working in the machine shop. - Brian and Daniel will meet in early January upon Brian's return to make plans for cathode construction. - Brian will touch base with the survey crew here at the lab about making the flatness measurements of our cathodes. They had indicated already that they might be able to rent a suitable system or even come up with funds to purchase one. We may also have the option of contracting this out locally. We would like to have measurement feedback on our constructed cathodes before the end of January.
Minutes prepared by Daniel. Send any comments or corrections along.