Minutes from target meeting held June 6 2014 in 892-2-009 

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2014/

a) Helium leak testing of the helium-3 roots blowers was done by pumping
the inlet and outlet simultaneously with a leak detector. No helium leaks
found on the installed water cooled heat exchangers. Stop pumping and 
monitor the pressure P1 at the roots inlet. Linear increase of pressure
observed, which could mean a leak or could be due to absorbed water vapor
in the pump oil.

Mount the cover plates on the heat exchangers and reconnect water pipes.
Test water flow. Small leaks found on two of the flow control valve cover 
plugs. Run all roots blowers for half an hour. The air conditioning unit 
of the pump room flashing with "Default general" light. Repair request 
submitted from CERN service portale. On Monday morning start the air 
conditioning and all the roots blowers. After three hours of operation 
air conditioning failure again.

Break the vacuum on Monday evening. Disconnect the water connections going
to the internal heat exchanger of WKP4000 on Tuesday morning. Unmount the
heat exchanger. Separate the copper part from the plate. The copper heat 
exchanger was send the Pfeiffer Suisse to get estimate of the work for
rebuilding the same unit from stainless steel.

See the photos: \dfs\Experiments\Compass\PT_data\Photos\Jaakko\2014_06_03 
  
b) Werner from Pfeiffer: in typical helium-3 pumping conditions used during
the run 2011 the outlet gas temperature of WKP4000 was estimated to rise to
90 - 120 C while the temperatures around 200 C are not yet critical.
Thus it should be possible to run this pump without the water cooled heat
exchanger. Monitoring of the gas temperature at the WKP4000 outlet is
probably a good idea.

c) Jaakko: Request from the CERN main workshop to get 3D step files of the
drawings NA58PT20131106-1, NA58PT20130813-1, NA58PT20131129-1 and
NA58PT20130809-1.

d) Testing of the gate valve on the helium-3 pumping line was discussed.

e) LN2 is not yet available for filling the liquid nitrogen trap buffer dewar
in the pump room.

f) Fabrice: installation work of the magnet control racks in the fenced
zone and cabling is going on. The solenoid power converter is not yet 
installed. About half of the cables produced. The patch panel for the signal 
cables needs to be produced, but the drawing has already been done. The power 
cable patch panel comes from the electrical services. The electrical network
emergency stop needs to be modified to cut the power from the fenced zone
and the platform simultaneously.

g) Kaori: empty the most downstream rack in the control room from the magnet
trim coil power supplies. One trim coil power supply dropped accidentally on 
the floor during this operation. The rack moved to new position more upstream
next to the microwave power supply rack. Electricity needs to be still
connected from the Normabarre above the racks.

Ethernet communication tested successfully between the PXI crate and NMR PC.
Next planned to test the NMR system in the control room with the Q-meters
connected.