Difference between revisions of "Minutes-1-15-2015"

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== CDC update ==
 
== CDC update ==
  
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- 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)  
+
- 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 was working on a tool to view the signals from the fADC125 modules in a single crate using the built-in pulser. Mike is also working on the CDC efficiency, it's >90% if require the track to be at <1mm to the wire.
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- CDC efficiency to be discussed on the next meeting.  
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+
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- Naomi has the test set-up at CMU working again with the prototype straws and old electronics. Waiting for Fernando to get the up-to-date pre-amps/firmware in order to compare with the results in the Hall.
+
  
 
== FDC update ==
 
== FDC update ==
  
−
- Lubomir found the drift velocity of the FDC in the Hall is higher than it was in the EEL126: see the time-to-distance functions plotted above. If it was only Ar/CO2 this suggests that we have now approx. 46/54 gas mixture instead of 40/60 in the EEL, as estimated with Garfield simulations. If this is the case this may partially explain the higher signals seen in the CDC, but certainly not enough to explain the factor of 4 change. It is not clear how one can get 54% CO2 instead of 60%. The gas factor "uncertainty" found by Mike (0.773 actual instead of 0.74 according to the tables) results in 58.5%CO2. At the same time the drift velocity change might be due to adding of alcohol to the gas mixture, which has to be studied with Garfield.  
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- Vlad used Mike's tool to test the bad FDC channels.  
  
 
- Vlad showed latest results from gain calibration studies. There's some systematics for the "bad" channels with gain coefficients >3, but the normal channels are stable. Vlad has a list of 8 channels showing no signal at all in the fADC125, that are to be studied with the Mike's tool. Vlad will have soon the first table with the gains to be implemented by Simon in the standard code.   
 
- Vlad showed latest results from gain calibration studies. There's some systematics for the "bad" channels with gain coefficients >3, but the normal channels are stable. Vlad has a list of 8 channels showing no signal at all in the fADC125, that are to be studied with the Mike's tool. Vlad will have soon the first table with the gains to be implemented by Simon in the standard code.   

Revision as of 19:13, 15 January 2015

January 15, 2015 FDC+CDC meeting

Connection

  1. Instructions for Bluejeans meeting connection
  2. FDC meeting ID: 290664653
  3. To join via a Web Browser, go to the page [1] https://bluejeans.com/290664653.

Agenda

  1. File:CDCUpdate15Jan2015.pdf (Mike)
  2. FDC update
  3. Electronics fADC125 replacements (Cody)
  4. Engineering Chiller Interlock (Dave)
  5. Other


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