Difference between revisions of "Minutes-1-15-2015"
From GlueXWiki
| Line 25: | Line 25: | ||
== CDC update == | == CDC update == | ||
| − | - Mike presented a report linked above: he and Simon found a parameter in the time-based track reconstruction that was not set correctly. After fixing this the efficiency is much higher (in the >90s% region). The residuals vs drift time has an offset ~300microns at >100ns which many interpreted as an indication for a different gas mixture. Note: the results presented are with magnetic field and the tracking was done with time-to-distance as simulated with Garfield for that field. Next step: to extract the time-to-distance from the data. Mike also presented the tool he made for reading/viewing one crate of f125s using pulser. | + | - Mike presented a report linked above: he and Simon found a parameter in the time-based track reconstruction that was not set correctly. After fixing this the efficiency is much higher (in the >90s% region). The residuals vs drift time has an offset ~300microns at >100ns which many interpreted as an indication for a different (faster) gas mixture. Note: the results presented are with magnetic field and the tracking was done with time-to-distance as simulated with Garfield for that field. Next step: to extract the time-to-distance from the data. Mike also presented the tool he made for reading/viewing one crate of f125s using pulser. |
- CDC efficiency to be discussed on the next meeting. | - CDC efficiency to be discussed on the next meeting. | ||
| Line 33: | Line 33: | ||
- Vlad used Mike's tool to test the bad FDC channels (see logbook entry). Out of 8 channels, 7 could not see the pulser signal (applied at the input of the pre-amp), i.e. having issues with the pre-amp, cable, connector or the fADC. Chris and Nick will check the 3M connectors for these channels. | - Vlad used Mike's tool to test the bad FDC channels (see logbook entry). Out of 8 channels, 7 could not see the pulser signal (applied at the input of the pre-amp), i.e. having issues with the pre-amp, cable, connector or the fADC. Chris and Nick will check the 3M connectors for these channels. | ||
| − | - Lubomir simulated with Garfield the effect of adding 1% propanol to the standard gas of 40/60 Ar/CO2. From the attached plots one can see | + | - Lubomir simulated with Garfield the effect of adding 1% propanol to the standard gas of 40/60 Ar/CO2. From the attached plots one can see ~6% decrease in the drift velocity, i.e. opposite to the effect observed in the data. |
| + | - From the alcohol consumption (~0.4l/30days for FDC and _0.6l/30days for the CDC according to Scot) one estimate ~0.8% alcohol in the FDC and ~0.4% for the CDC, very crude estimate!!! From the vapor pressure estimations | ||
== Electronics == | == Electronics == | ||
Revision as of 19:42, 15 January 2015
January 15, 2015 FDC+CDC meeting
Connection
- Instructions for Bluejeans meeting connection
- FDC meeting ID: 290664653
- To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.
Agenda
- File:CDCUpdate15Jan2015.pdf (Mike)
- FDC update
- Electronics fADC125 replacements (Cody)
- Engineering Chiller Interlock (Dave)
- Other
![[2]](http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test1.png){kind=link}
![[3]](http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test2.png){kind=link}
![[4]](http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test3.png){kind=link}