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

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= Connection =
 
= Connection =
  
−
# [https://halldweb1.jlab.org/wiki/index.php/Connect_to_Bluejeans_Meetings Instructions for Bluejeans meeting connection]
+
# [https://halldweb.jlab.org/wiki/index.php/Connect_to_Bluejeans_Meetings Instructions for Bluejeans meeting connection]
 
# FDC meeting ID: 290664653
 
# FDC meeting ID: 290664653
 
# To join via a Web Browser, go to the page [https://bluejeans.com/290664653] https://bluejeans.com/290664653.
 
# To join via a Web Browser, go to the page [https://bluejeans.com/290664653] https://bluejeans.com/290664653.
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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]
 +
#* [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
−
 
−
<!--
 
  
 
= Minutes =
 
= Minutes =
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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 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). 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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== FDC update ==
 
== FDC update ==
  
−
- Vlad used Mike's tool to test the bad FDC 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.
  
−
- 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.
+
- 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), i.e. should be about 50/50! We are looking now for a way to measure the gas percentages in the mixture.
  
 
== Electronics ==
 
== Electronics ==
  
−
- Nick and Chris started re-routing the CDC HV cables, they will be attached to 4 thin bars (as a frame) mounted in front of the detector. Additional capacitor will be put on the HVBs to further reduce the noise. Mike asked but Fernando said there's no need to re-route also the LV cables, they have constant consumption (diff. amplifiers).  
+
- Nick and Chris started modifying the HVBs: adding capacitors, milling retainers. Some dust (like rust) and fibers were found on the caps of the top HVBs - picture linked above.
  
−
- Fernando ordered HV connectors that are needed to built the filter for the CAEN HV. CAEN are interested in this and they have already built such a box in a VME module frame (for one HV cable). We will get one of this for testing. CAEN are interested also in building the final filter-boxes, no discussions yet if they want to charge us for this.
+
- Cody: 24 (out 25) new fADCs were tested and only two failed - much better than with the previous production. Cody replaced 10 fADC125 (see logbook entry) following the list of bad channels (with missing bits) given to him by Naomi and Vlad. Will try to fix the bad channels if possible or ship them for repair.
−
 
+
−
- 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.
+
  
 
== Engineering ==
 
== Engineering ==
  
−
- The FDC chiller is ready for shipping (or has been shipped), expect it back in 6-7 weeks.
+
- Dave presented his plan for re-using an old AC power reset module (from Hall B) for shutting down the chiller. It has an AC contactor controlled by the PLC using same logic as for the MPOD interlock. (presentation attached).  
−
 
+
−
- We discussed options for turning off the power of the FDC chiller in case the temperature of the Fluorinert is out of the limits. On the next day Dave looked into this and decided to do something he's doing for HallB: external box that is plugged between the outlet and the chiller (note: 208V three phases 30A). It has a relay inside controlled by the PLC system that is taking the temperature from the epics readings of the chiller.
+
−
 
+
−
== Other ==
+
  
−
- Eugene expects from the drift chamber groups results on: efficiency, alignment, resolution, by the end of the month.
+
- The FDC chiller has been finally shipped for repair.
−
-->
+

Latest revision as of 06:05, 1 April 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
  4. Engineering Chiller Interlock (Dave)
  5. Other

Minutes

Participants: Naomi (CMU), Eugene, Mike, Dave, Fernando, Chris, Nick, Simon, Cody, Beni, Vlad, and Lubomir (JLab).

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). 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.

FDC update

- 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.

- 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), i.e. should be about 50/50! We are looking now for a way to measure the gas percentages in the mixture.

Electronics

- Nick and Chris started modifying the HVBs: adding capacitors, milling retainers. Some dust (like rust) and fibers were found on the caps of the top HVBs - picture linked above.

- Cody: 24 (out 25) new fADCs were tested and only two failed - much better than with the previous production. Cody replaced 10 fADC125 (see logbook entry) following the list of bad channels (with missing bits) given to him by Naomi and Vlad. Will try to fix the bad channels if possible or ship them for repair.

Engineering

- Dave presented his plan for re-using an old AC power reset module (from Hall B) for shutting down the chiller. It has an AC contactor controlled by the PLC using same logic as for the MPOD interlock. (presentation attached).

- The FDC chiller has been finally shipped for repair.

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