Difference between revisions of "Minutes-1-15-2015"
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#* Tests with pulser [https://logbooks.jlab.org/entry/3316843 logbook entry],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test1.png],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test2.png],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test3.png] (Vlad) | #* Tests with pulser [https://logbooks.jlab.org/entry/3316843 logbook entry],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test1.png],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test2.png],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/Vlad_pulser_test3.png] (Vlad) | ||
#* Effect of the alcohol [http://www.jlab.org/Hall-D/detector/fdc/commissioning/garf4060.pdf],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/garfal1per.pdf] (Lubomir) | #* Effect of the alcohol [http://www.jlab.org/Hall-D/detector/fdc/commissioning/garf4060.pdf],[http://www.jlab.org/Hall-D/detector/fdc/commissioning/garfal1per.pdf] (Lubomir) | ||
| − | # Electronics [https://logbooks.jlab.org/entry/3317069 fADC125 replacements] (Cody) | + | # Electronics |
| + | #* HVB refurbishment [http://www.jlab.org/Hall-D/detector/fdc/CDC/CDCtrashoncaps.jpg trash on HVBs] | ||
| + | #* f125 replacement [https://logbooks.jlab.org/entry/3317069 fADC125 replacements] (Cody) | ||
# Engineering [http://www.jlab.org/Hall-D/detector/fdc/commissioning/FDC_Chiller_Interlock.pptx Chiller Interlock (Dave)] | # Engineering [http://www.jlab.org/Hall-D/detector/fdc/commissioning/FDC_Chiller_Interlock.pptx Chiller Interlock (Dave)] | ||
# Other | # Other | ||
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== 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 is 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. | + | - 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). Great result! The residuals vs drift time has an offset ~300microns at >100ns which is 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. | ||
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- From the alcohol consumption (~0.4l/30days for FDC and _0.6l/30days for the CDC according to Scot) Lubomir estimated ~0.8% alcohol in the FDC and ~0.4% for the CDC, very crude estimate!!! From the vapor pressure estimations we get the same order of 0.5-1% alcohol. Since the pressure in the alcohol bubbler varies between 7-12psi the alcohol percentage would vary too. As a quick fix we will make the pressure range smaller. | - From the alcohol consumption (~0.4l/30days for FDC and _0.6l/30days for the CDC according to Scot) Lubomir estimated ~0.8% alcohol in the FDC and ~0.4% for the CDC, very crude estimate!!! From the vapor pressure estimations we get the same order of 0.5-1% alcohol. Since the pressure in the alcohol bubbler varies between 7-12psi the alcohol percentage would vary too. As a quick fix we will make the pressure range smaller. | ||
| − | - 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. If this is true we would expect much bigger deviation from the standard 40/60 Ar/CO2 mixture than what was estimated from the drift velocity to be 46/54 (see January 8 meeting). We are looking now for a way to measure the gas percentages in the mixture. | + | - 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. If this is true we would expect much bigger deviation from the standard 40/60 Ar/CO2 mixture than what was estimated from the drift velocity to be 46/54 (see January 8 meeting), i.e. should be about 50/50! We are looking now for a way to measure the gas percentages in the mixture. |
== Electronics == | == Electronics == | ||
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- Nick and Chris started modifying the HVBs: adding capacitors, milling retainers. Some dust (like rust) was found on the top HVBs | - Nick and Chris started modifying the HVBs: adding capacitors, milling retainers. Some dust (like rust) was found on the top HVBs | ||
| − | - | + | - |
- Cody: the new 25 fADC125 are here and are being tested, very good results so far. We discussed also the issues with the f125 firmware, but this will be left for the fADC125 meeting. | - Cody: the new 25 fADC125 are here and are being tested, very good results so far. We discussed also the issues with the f125 firmware, but this will be left for the fADC125 meeting. | ||
Revision as of 17:50, 16 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
- HVB refurbishment trash on HVBs
- f125 replacement 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}
