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

From GlueXWiki
Jump to: navigation, search
Line 12: Line 12:
 
= Minutes =
 
= Minutes =
  
−
Participants: Eugene, Fernando, Dave, Nick, Chris, Simon, Beni, and Lubomir.
+
Participants: Fernando, Dave, Nick, Chris, Simon, Beni, Eugene, and Lubomir.
  
 
== Installation ==
 
== Installation ==
  
−
- The third quadrant (down left) has been connected to the detector side (see pictures attached). To keep the cables flat on the mesh, Casey uses long zip ties; we want to make sure that at the inner side of the mesh (second picture) these ties do not touch the CDC. Starting Monday, Nick and Chris (with the help of Casey and Tina if needed) will start routing these quadrant below the platform to the electronics side. Before that, over the weekend, Beni will test the second half of the quadrant (packages 3 and 4) with the mini-DAQ.
+
- 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 +2100V/-500V without any trips from last Thursday (1/16) till Tuesday (1/21). One HV channel has a current oscillating between 0.5 and 1 uA, indicating some small discharging every 10-15 min, but never trips. On Tuesday Lubomir increased it to +2200V/-500V and it was stable over the night for all the channels, except four channels where the negative HV had to be lowered by 100V to have it stable. On Wednesday morning suddenly all the positive HV channels were turned off and it is not clear how, because the lab was closed and there was nobody in the Hall. We suspect it was a power glitch, but then why the negative HV channels were still on. Beni suggested checking if the ROCs did restart at the same time which may suggest it was a power problem.  
+
- The HV was stable at +2200V/-500V since the beginning of the week.  
  
 
- 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.   
 
- 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.   

Revision as of 12:32, 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


Retrieved from "https://halldweb1.jlab.org/wiki/index.php?title=Minutes-1-30-2014&oldid=54265"