Difference between revisions of "Minutes-1-30-2014"

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# Mini-DAQ results [https://halldweb1.jlab.org/elog-halld/FDC FDC E-log] (Beni)
 
# Mini-DAQ results [https://halldweb1.jlab.org/elog-halld/FDC FDC E-log] (Beni)
 
# Other
 
# Other
−
 
−
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= Minutes =
 
= Minutes =
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== Installation ==
 
== Installation ==
  
−
- Casey, Tina and Anatoly finished cabling the FDC at the detector side and it looks nice (first picture attached). On Tuesday the platform on the right side was opened and today Nick and Chris started routing the right bottom quadrant to the electronics. They are done with package #4 working now on #3. Since we will have all the cables routed to the right racks we will start at the same time plugging the cables to the modules. Not all the modules are in place, but Nick and Chris will install the missing modules (now Cody has them) and Fernando agreed.  
+
- Casey, Tina and Anatoly finished cabling the FDC at the detector side and it looks nice (first picture attached). On Tuesday the platform on the right side was opened and today Nick and Chris started routing the right bottom quadrant to the electronics. They are done with package #4 working now on #3. Since we will have all the cables routed to the right racks we will start at the same time plugging the cables to the modules. Not all the modules are in place, but Nick and Chris will install the missing modules (now Cody has them) and Fernando agreed.  
  
−
- The HV was stable at +2200V/-500V since the beginning of the week.  
+
- HV: was stable since the beginning of the week at +2200V/-500V, except for 6 channels at +2200/-450V and three channels at +2200/-500V, out of 96 total number of HV channels. Such change of the field voltage on these 9 channels affects the biggest drift times/distances where the resolution is in any case poor, so the average track resolution will not be affected. Note also that +2200V is the upper limit of the HV range and we may not need to be there.
  
−
- On Wednesday also the gas bottle was empty. Since there were no techs to crane a new bottle, Lubomir switched to another bottle used before which was empty by Thursday morning. It turned out that one bottle (Ar/CO2 40/60 pre-mixed) at 800 sccpm is good for four days. We decided with Tom to have always one extra, full bottle, craned on the platform, so that we can change the gas without the techs being there. Another option would be to mix the gas using a temporary gas system, but Eugene suggested we better use pre-mixed bottles till the final gas system is ready. Then, as Beni explained, the idea is to have 12 Ar bottles used at the same time (connected in one by the supplier). This is not the case for the CO2 bottles, but we will have many of them at the same time.
+
- Gas: since Tuesday we are running gas at 400ccpm (according to the mass flow controller set point) compared to 800ccpm before, because we don't have more bottles and the next ones are expected to come next week. This morning somebody working at upstream face of the magnet, pulled the exhaust gas line and we found (also in the morning) the bubbler and a "quick-connect" connector disconnected. As a result the pressure  went down to ~20Pa from ~60Pa. The pressure recovered in about two hours. At the end of last week one of the bubblers stopped bubbling and the pressure started increasing (as usual), however, after inserting a tube and the output of the bubbler going inside the oil (second picture attached) it started bubbling again with high rate and the bubbling is very stable since then.
 +
 
  
 
== Engineering ==
 
== Engineering ==
 +
 +
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- Bill was transporting (that's why not at the meeting) the extra cathode mounted on the strong back to be scanned at a Williamsburg company. It turned out they don't have an optical CMM with these sizes, but suggested to contact the same company (New River Kinetics) at Richmond.
 
- Bill was transporting (that's why not at the meeting) the extra cathode mounted on the strong back to be scanned at a Williamsburg company. It turned out they don't have an optical CMM with these sizes, but suggested to contact the same company (New River Kinetics) at Richmond.

Revision as of 18:03, 31 January 2014

January 30, 2014 FDC meeting

Agenda

  1. Installation [1],[2] (all)
  2. Engineering December 2013 survey
  3. Electronics (Chris, Nick)
  4. Mini-DAQ results FDC E-log (Beni)
  5. Other

Minutes

Participants: Fernando, Dave, Nick, Chris, Simon, Beni, Eugene, and Lubomir.

Installation

- Casey, Tina and Anatoly finished cabling the FDC at the detector side and it looks nice (first picture attached). On Tuesday the platform on the right side was opened and today Nick and Chris started routing the right bottom quadrant to the electronics. They are done with package #4 working now on #3. Since we will have all the cables routed to the right racks we will start at the same time plugging the cables to the modules. Not all the modules are in place, but Nick and Chris will install the missing modules (now Cody has them) and Fernando agreed.

- HV: was stable since the beginning of the week at +2200V/-500V, except for 6 channels at +2200/-450V and three channels at +2200/-500V, out of 96 total number of HV channels. Such change of the field voltage on these 9 channels affects the biggest drift times/distances where the resolution is in any case poor, so the average track resolution will not be affected. Note also that +2200V is the upper limit of the HV range and we may not need to be there.

- Gas: since Tuesday we are running gas at 400ccpm (according to the mass flow controller set point) compared to 800ccpm before, because we don't have more bottles and the next ones are expected to come next week. This morning somebody working at upstream face of the magnet, pulled the exhaust gas line and we found (also in the morning) the bubbler and a "quick-connect" connector disconnected. As a result the pressure went down to ~20Pa from ~60Pa. The pressure recovered in about two hours. At the end of last week one of the bubblers stopped bubbling and the pressure started increasing (as usual), however, after inserting a tube and the output of the bubbler going inside the oil (second picture attached) it started bubbling again with high rate and the bubbling is very stable since then.


Engineering

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