Difference between revisions of "Minutes-3-31-2016"
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- Simon showed results for the two-track vertices from straight track data (see the logentry). We first discussed the the two stripes on the 2d plot - r vs z of the vertex position. The upstream one is at the downstream CDC plate. The other stripe is in the middle of the first package (not clear why?). This may indicate background from photons(?) stopping in the CDC plate that has an inner radius of ~10cm; for r<10cm the photons are stopped in the first package. Eugene: e+/e- from the photon conversion can't be separated without magnetic field. | - Simon showed results for the two-track vertices from straight track data (see the logentry). We first discussed the the two stripes on the 2d plot - r vs z of the vertex position. The upstream one is at the downstream CDC plate. The other stripe is in the middle of the first package (not clear why?). This may indicate background from photons(?) stopping in the CDC plate that has an inner radius of ~10cm; for r<10cm the photons are stopped in the first package. Eugene: e+/e- from the photon conversion can't be separated without magnetic field. | ||
| − | - Second part of Simon's results | + | - Second part of Simon's results: projections on z. The positions of the target walls and the scattering chamber, as defined by the FDC with straight tracks, are off by almost 1cm as compared to the results when using the CDC with magnetic field. Later Simon included FDC only track with magnetic field and confirmed an offset b/n FDC and CDC by about 8mm. |
| + | |||
| + | - Lubomir showed comparison b/n the FDC currents with full/empty target without magnetic field and 3.4mm collimator. The ratio is | ||
== Other == | == Other == | ||
Revision as of 19:28, 3 April 2016
March 31, 2016 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
- NIM Papers
- Run Status
- Tracking two-track vertices without magnetic field (Simon)
- CDC update (Beni/Mike)
- FDC update
- full/empty target currents, field/ no field currents
- straight track results: wire resolution,FDC3 preliminary efficiency
- Electronics (Fernando, Chris, Nick)
- fADC125 meeting (Naomi, Cody, Beni)
- leading edge timing resolution TH=100, TH=50,resolution ADC>600, TH=120,resolution ADC<600, TH=120 (Lubomir)
- Other
Minutes
Participants: Curtis, Mike (CMU) Eugene, Beni, Luke, Simon, Nick, Naomi and Lubomir (JLab).
