Revision as of 18:02, 13 February 2015

February 12, 2015 FDC+CDC meeting

Connection

Gas issues
- leakage [2]
- CO2 monitoring FDC1
Electronics (Fernando, Cody)
Engineering (Dave)
CDC update Resolution Vs. Drift time 1200A(Mike)
FDC update (Lubomir)
- alignment [3],[4], [5]
- efficiency studies [6],[7],[8],[9],[10],
Other

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 == Electronics ==
-- Fernando: the higher CDC noise (~60mV compared to ~30mV before) related to the loop on HV cables we had before that acts as an inductance. Fernando tested the new HV filter from CAEN on one cable and it worked great: noise <20mV (with or without loop). This was only a prototype box, now we need 13 more to put on all the cables.
+- Fernando: the higher CDC noise (~60mV compared to ~30mV before) related to the loop on HV cables we had before that acts as an inductance. Fernando tested the new HV filter from CAEN on one cable and it worked great: noise <20mV (with or without loop). This was only a prototype box, now we need 13 more to put on all the cables. Fernando agreed that if we remove the CDC, the HV cables can be re-routed with a loop.
 -  Cody: testing the f125 with the latest firmware at high rates in block-mode. In mode 8 one can reach 5kHz, in mode 1 up to 20kHz, and in mode 7 up to 50kHz -  these limits correspond to 100% occupancy.
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 == CDC update ==
-- Mike is working on the CDC efficiency. CDC is ready for taking data with the BCAL cosmic trigger, hopefully this weekend.
+- Mike showed a plot linked above, with the resolutions (sigma of the residuals) vs drift time. The residuals were obtained from tracking in magnetic field (somehow the track quality is poorer without field) after Simon applied
 == FDC update ==