March 16, 2011 Tracking CDC/FDC

Meeting Time and Place

Wednesday March 16, 2011 at 11:30am At Jefferson Lab, the meeting will be held in F326

Connections

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Agenda

1. Announcements
2. FDC Update
3. CDC Update
   1. Status of the Construction.
   2. Status of the hook-up wires.
   3. Choice of Solder, Kester 285 which non-corrosive, non-conductive and does not need cleaning.

Minutes

Participants: Curtis, Naomi, Beni, Eugene, Lubomir, Simon, Dave, Mark, Tim and Elton.

FDC Update

1. There will be a FDC readiness review on March 31 and most of us are busy with the paperwork.
2. Our techs were trained by Mark Stevens and Brian Kross in making the cathode planes. The procedure that includes cutting, alignment and gluing the foils, requires special skills and looks more difficult than the wire stringing. After sever trials our techs were able to make a good quality cathode.
3. There was a confusion about the tests with the "upside-down" prototype: it turned out the positive HV was put on all the wires, sense and field. Beni added more amplifiers on the external chambers used in the test set-up.
4. Eugene ask about the status of the conductive tape cathode soldering: we are improving the tooling to make the pressure equally distributed over the contact area.

CDC Update

1. Construction: Curtis reported on construction status. Row 17 is in progress and we have enough straws to complete row 20. According to Tim's earlier communication, the new straws from Lamina should be ready in about 6 weeks.
2. Hook-up wires: the silver beads and conductive rubber have been ordered. Slava will send CMU some lifesize drawings of the endplates showing the HVBs so that the connection pattern can be determined.
3. Solder: Fernando suggested that we use Kester 285. This leaves flux residues which are non-corrosive and non-conductive (and fungus-resistant). We propose to use this; we will not need to clean off any flux residue.
4. Prototype: Naomi is making an outer plenum for the prototype to counteract its leaks, it is nearly finished.
5. Gas flow: Beni calculated that the CDC would require approx 3L gas/minute, so one pair of cylinders would last around 3 days.