Difference between revisions of "Minutes-7-2-2015"
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= Minutes = | = Minutes = | ||
− | Participants: | + | Participants: Curtis, Mike(CMU), Sean(NU), Eugene, Luke, Dave, Chris, Nick, Simon, Beni, Sergey, and Lubomir (JLab). |
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+ | == FDC update == | ||
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+ | - Lubomir presented two slides summarizing the FDC performance for the S&T Review. Comments about efficiency slide - the worst (package #3) is shown; each chamber reconstructs 3D hit which requires hits in both cathodes (with at least 3 strips fired) and the wire plane. Resolution - to show the average wire resolution; discussions about why two methods give different results for the cathode resolution and what is the effect of the multiple scattering. General remark - needs bigger axis labels. | ||
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+ | - Results with 55Fe source for the avalanche position w.r.t. wire reconstructed from the cathodes. Z (perp. to chamber plane) coordinate calculated from the up/down total charge ratio. X coordinate (in plane perp. to wire) from the crossing of the up/down centroids. After applying centroid corrections and calibrating the channels one can see a hole for the wire and amazing resolution of ~80 microns in X and ~30 microns in Z. Interestingly the avalanche develops at ~130 microns from the wire, while on the drift chamber books one can find values of ~60 microns. | ||
== CDC update == | == CDC update == | ||
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- Beni looked at the pedestals in the CDC varying different parameters: number of samples used, integer vs real number averaging, position of the pedestal window - all this explained in the above link. The main discussion was about the fact that Beni sees some slope (increase), when averaging over all the events, in the region before the real detector signal comes in case the signals are late. Mike suggested this may come from cross-talk from the other channels, but Beni has looked at this. Late signals can happen in cosmic showers (Eugene). Beni will do more studies when the computers are back. | - Beni looked at the pedestals in the CDC varying different parameters: number of samples used, integer vs real number averaging, position of the pedestal window - all this explained in the above link. The main discussion was about the fact that Beni sees some slope (increase), when averaging over all the events, in the region before the real detector signal comes in case the signals are late. Mike suggested this may come from cross-talk from the other channels, but Beni has looked at this. Late signals can happen in cosmic showers (Eugene). Beni will do more studies when the computers are back. | ||
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== Electronics == | == Electronics == |
Revision as of 18:18, 2 July 2015
July 2, 2015 Drift Chamber meeting
Connection
- Instructions for Bluejeans meeting connection
- Meeting ID: 290664653
- To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.
Agenda
- CDC analysis update (Mike, Simon)File:MillepedeResults 2July2015.pdf
- FDC analysis update (Lubomir)
- Electronics (Fernando, Chris, Nick)
- Engineering
- Other