Difference between revisions of "Minutes-7-23-2015"
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= Minutes = | = Minutes = | ||
− | Participants: Curtis, Mike(CMU), | + | Participants: Curtis, Mike (CMU), Eugene, Luke, Dave, Chris, Simon, Beni, and Lubomir (JLab). |
== CDC update == | == CDC update == | ||
− | - | + | - Beni found the CO2 MFC for the CDC was not working. As a result there was only Ar in the CDC, explaining the max HV of 1kV. The MFC will be sent for fixing and two new MFC will be ordered. Scot is working on that but the time frame is not clear yet. In the mean time we decided to connect CDC mixing tank to the FDC mixing tank, and fill both with the FDC MFCs set to 50/50 Ar/CO2 gas mixture. |
− | - Mike showed | + | - Mike showed more plots demonstrating the azimuthal asymmetry in the drift times for one "bad" straw. The time-to-distance is a little different in different direction. The main difference is in the range and, if time is converted into distance, the wire appears to be shifted by ~1mm from the middle in horizontal direction. Beni suggested to divide the tube into (at least three) parts along z to see if this is a real offset of the wire. |
== FDC update == | == FDC update == | ||
− | - | + | - Lubomir showed results about the improved cathode resolution. |
− | - | + | - Luke performed measurements with 55FE source on the spare package with 60/40 Ar/CO2 for different HV. He described the calibration procedure and showed some results for 2050V and 1950V. The up/downstream avalanche peak position are well visible as with 40/60 gas mixture. At 2050V they are ~150microns apart (compared to 250 microns with 40/60 at almost the same gas gain), while at 1950V they are 350microns apart. |
== Electronics == | == Electronics == |
Revision as of 12:50, 24 July 2015
July 16, 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 update (Mike, Simon) File:MStaibStrawDeform.pdf
- FDC update (Lubomir, Luke)
- Electronics (Fernando, Chris, Nick)
- Engineering
- Other