Revision as of 12:04, 17 September 2015

September 10, 2015 Drift Chamber meeting

Connection

CDC update
- CDC response to 55Fe and 90Sr sources logbook entry
- Electronics response functions
- The sag saga: maximum docas at center of CDC
FDC update
- studies with 90Sr and 55Fe on spare package: [2],[3], [4]
Electronics
Engineering
Other

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 == FDC update ==
-- Lubomir showed cathode resolution results from the spring run with two different ST+FCAL triggers: run 3137 "standard" trigger and run 3200 excluding 4 additional layers of blocks in the center. The resolutions with the inner blocks excluded looks better and now very close to the one (~200 microns) in the fall run. This was achieved by using tighter cuts on the tracks used for the resolution studies; obviously the fact that we had half the energy in the spring explains this. Still, the offsets used for the fall and the spring runs are different and we don't understand why.
+- Scope picture of the drift times in the two thick chambers of the spare package shown above, using 90Sr source and a trigger made on the scope by coincidence of two parallel wires from the two chambers. The drift times look
-- Studies with 55Fe on the thick cell in the spare package: due to diffusion not all the charge is visible depending how far the photon interaction was from the wire. Expecting better results with 90/10 gas mixture where the drift times are much shorter.
 == Electronics ==