Difference between revisions of "Minutes-10-30-2014"

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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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# FDC update (Vlad, Lubomir)
 
# FDC update (Vlad, Lubomir)
 
#* Chiller status [http://www.jlab.org/Hall-D/detector/fdc/commissioning/Chiller_sense_problem.png]
 
#* Chiller status [http://www.jlab.org/Hall-D/detector/fdc/commissioning/Chiller_sense_problem.png]
 +
#* [http://www.jlab.org/Hall-D/detector/fdc/commissioning/Gluex_final_survey_for_Oct2014_run.xlsx FDC survey]
 
#* Strip calibration
 
#* Strip calibration
−
# Commissioning [https://hdops.jlab.org/wiki/index.php/Hall_D_Commissioning Wiki Page] (all)
+
# Commissioning [https://halldweb.jlab.org/hdops/wiki/index.php/Hall_D_Commissioning Wiki Page] (all)
 
# Other
 
# Other
−
 
−
<!--
 
  
 
= Minutes =
 
= Minutes =
  
−
Participants: Curtis, Naomi (CMU) Mike, Fernando, Chris, Eugene, Tim, Dave, Beni, Nick, Simon, Vlad, Cody, Sergey, and Lubomir (JLab).
+
Participants: Naomi (CMU) Eugene, Fernando, Simon, Dave, Tim, Chris, Nick, Mike, Sean, Beni, Cody, Sergey and Lubomir (JLab).
−
.
+
−
== DAQ and electronics ==
+
  
−
- Cody generated a new version of the firmware that is much more stable, as Beni tested it over the last night. With the new firmware Sasha was also able to have the CDC crates running at >1kHz without crushes for some time (before, they crushed at about 300Hz). However, with the new firmware, some new modules started showing problems, as tested by Beni and Sergey. A chip-scope was installed on the last module of ROCFDC5, but turns out other modules were crushing the DAQ now.
+
== FDC chiller ==
  
−
- Fernando explained the changes in the firmware: in the previous version, Cody let the CAD software do the planing of the changes (in particular going from 16 to 72 channels) to the f250 firmware. As a result, some of the clocks were not routed in an uniform way. Now Cody manually required a separate (clean) area to be used for the clock distribution.  
+
- The chiller failed again on Tuesday (see plot attached): at 8:23am the Fluorinert temperature started increasing (blue), when it reached 25C the software interlock (green step function) stopped the LV. The temperature increased up to 48C then went down to 20C, by itself, by the time we got down in the Hall at 9:15am. The temperature change was real since it was followed by a change of up to 2 Pa in the gas pressure in the chambers (brown).
  
−
- Cody: the new bad modules are most likely related to a different problem, could be a hardware problem. We are not confident in the quality of the boards (Fernando). The first article f125 from the new vendor will arrive next week.  
+
- Dave: the chiller showed initially "11: Reservoir High Temp" then " 21: Controller Error FLT T2 Sensor". After some troubleshooting we were not able figure out if the sensor or the controller has a problem, but another problem appeared: "04: CPRSR Overheat FLT". At this point, the facility people found that the compressor failed again. The original compressor failed and was replaced 2-3 months ago. Dave talked to the SMC representative: the Controller/Sensor error won't go by itself, most likely it will show up again after the compressor is fixed. Eugene agreed to order a new controller and a sensor. The parts will be here on Monday.  
  
−
- Eugene: For the first days of running we should simply exclude the bad modules from the DAQ till we find (if any) a stable configuration that runs for at least an hour without crushes. Then, during the several days of down time we may tray to fix/replace the bad modules. At least for the first days, the main priority will be to have the DAQ working in any configuration (even without the chambers!). Then we can think of how to test the detectors, which may be postponed till December.
+
- Tim: facilities are replacing the compressor now. The representative from Hermitage Automation is coming at 2pm to look at the unit. We will continue troubleshooting once the compressor is replaced.
 +
 +
- Lubomir will discuss with Hovanes possibilities for powering off the chiller in case of a failure like this using epics.
  
−
- Bryan Moffit is working on a software reset of the module if it crushes, so that you re-sync the events and use the information from that module further without stopping the DAQ.
+
== DAQ ==
 +
 
 +
- Cody made changes in the f125 firmware and now the DAQ is running without any crashes or errors!!! All the CDC and FDC crates are read out, but right now there's no information in the FDC crates.
 +
 
 +
- Beni: David Lawrence found that the BCAL and CDC information is shifted by one event. This was later fixed by including one additional reset in the readout list.
  
 
== CDC update ==
 
== CDC update ==
  
−
- Mike is working on the dac/pedestal calibration. Simple slope extrapolation doesn't work. He is using a standalone code with Beni's DAQ, that will be used for checking the rates when the main DAQ is not working.
+
- Mike: CDC HV channels that were put on 100nA and 1uA scale both tripped during the photon beam alignment. Now both HV channels were switched to 10uA scale.
 +
 
 +
- Mike has a GUI that monitors the CDC rates online, using independent trigger-less readout of the crates. Mike is ready to work on a similar GUI for the FDC.
  
 
== FDC update ==
 
== FDC update ==
  
−
- Tim: next week we will have the results from the last FDC survey, namely z-positions and plane angles, SEPARATELY for each package.
+
- The final results of the GlueX detector survey were given to Tim (attached) where FDC packages are shown individually. The biggest deviation of the package planes from vertical position is ~0.1 deg which is expected to have small contribution to the resolution.
  
−
- Vlad showed plots with gain coefficients as reconstructed from the EEL125 data separately for each cathode (first plot linked above). Now he is simulating exclusion of a group of bad channels (like bad module) to see if the calibration of the rest is affected. Second plot shows the error in the coefficients for the different channels in case a group of channels (~ 160-170) is excluded.
+
- Vlad applied the reconstructed gain coefficients of the third package to the data from the EEL: these 3% (R.M.S.) corrections result in improvement of the strip resolution from 150 microns to 140 microns.  
  
 
== Commissioning ==
 
== Commissioning ==
  
−
- Simon did a plugin for the FDC online monitoring, showing the strip and wire profiles as discussed last time. Wire profiles were OK, but not the strips because of some noisy channels (due to wrong dac values for example). Lubomir continued working, adding more information to the code using position and timing correlation between the two cathodes and the wires to filter out the noise. While the position correlations are OK, there are inconsistencies with the timing correlations. Due to the lack of the trigger time (not yet implemented in JANA/DANA frame) Lubomir tried to synchronize the wire timing using the f125 timing information.
+
- Lubomir has a working plugin for the FDC online monitoring that works with the latest f125 data format.
  
−
-->
+
- Simon (answering Eugene's question) about the CDC alignment: no improvement in the resolution so far, limited by the statistics and the fact that the cosmic trigger selects tracks at one side of the detector. Expect better results with BCAL trigger and more statistics.

Latest revision as of 00:14, 1 April 2015

October 30, 2014 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. DAQ (Beni)
  2. Electronics (Fernando)
  3. CDC update (Mike)
  4. FDC update (Vlad, Lubomir)
  5. Commissioning Wiki Page (all)
  6. Other

Minutes

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

FDC chiller

- The chiller failed again on Tuesday (see plot attached): at 8:23am the Fluorinert temperature started increasing (blue), when it reached 25C the software interlock (green step function) stopped the LV. The temperature increased up to 48C then went down to 20C, by itself, by the time we got down in the Hall at 9:15am. The temperature change was real since it was followed by a change of up to 2 Pa in the gas pressure in the chambers (brown).

- Dave: the chiller showed initially "11: Reservoir High Temp" then " 21: Controller Error FLT T2 Sensor". After some troubleshooting we were not able figure out if the sensor or the controller has a problem, but another problem appeared: "04: CPRSR Overheat FLT". At this point, the facility people found that the compressor failed again. The original compressor failed and was replaced 2-3 months ago. Dave talked to the SMC representative: the Controller/Sensor error won't go by itself, most likely it will show up again after the compressor is fixed. Eugene agreed to order a new controller and a sensor. The parts will be here on Monday.

- Tim: facilities are replacing the compressor now. The representative from Hermitage Automation is coming at 2pm to look at the unit. We will continue troubleshooting once the compressor is replaced.

- Lubomir will discuss with Hovanes possibilities for powering off the chiller in case of a failure like this using epics.

DAQ

- Cody made changes in the f125 firmware and now the DAQ is running without any crashes or errors!!! All the CDC and FDC crates are read out, but right now there's no information in the FDC crates.

- Beni: David Lawrence found that the BCAL and CDC information is shifted by one event. This was later fixed by including one additional reset in the readout list.

CDC update

- Mike: CDC HV channels that were put on 100nA and 1uA scale both tripped during the photon beam alignment. Now both HV channels were switched to 10uA scale.

- Mike has a GUI that monitors the CDC rates online, using independent trigger-less readout of the crates. Mike is ready to work on a similar GUI for the FDC.

FDC update

- The final results of the GlueX detector survey were given to Tim (attached) where FDC packages are shown individually. The biggest deviation of the package planes from vertical position is ~0.1 deg which is expected to have small contribution to the resolution.

- Vlad applied the reconstructed gain coefficients of the third package to the data from the EEL: these 3% (R.M.S.) corrections result in improvement of the strip resolution from 150 microns to 140 microns.

Commissioning

- Lubomir has a working plugin for the FDC online monitoring that works with the latest f125 data format.

- Simon (answering Eugene's question) about the CDC alignment: no improvement in the resolution so far, limited by the statistics and the fact that the cosmic trigger selects tracks at one side of the detector. Expect better results with BCAL trigger and more statistics.

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