Minutes from target meeting held April 1 2011 in 892-1-B09

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2011/

a) On Tuesday unmount two of the largest water cooled heat exchangers in
between two adjacent roots blowers. Two smaller ones repaired at CERN
workshop on Wednesday. Water pressure test at 7.15 bar absolute foreseen 
next week. New o-rings for remounting of the heat exchangers ordered on 
Tuesday and Wednesday. 

b) Tuesday afternoon short meeting to discuss target modifications and 
planning for the Drell-Yan physics.

c) Meeting on Wednesday morning to discuss the repair plans. History of the
incident discussed. Electronic pressure gauge and thermometer could be 
installed to the water line. Cleaning of the vacuum volume of the heat
exchangers after the repair was discussed.

d) On Thursday close the ports of small heat exchanger and pump vacuum volume
with leak detector. Spray helium on the heat exchanger. No leaks found.

e) Meeting on Friday morning with Bill Bannister EN/CV in the pump room 
888-R-416. It is possible to install safety valve on the outlet of the
pressure regulator. Bill: damage was likely caused by both freezing and
high pressure. The purge valves should be left open after removing the
water from the circuit. Fabrice: the helium-4 pump water inlet has a closing
valve while the outlet can only be closed by setting the flow control valve
to zero (was not done on December 6). In the helium-3 roots both inlet
and outlet can be closed with a hand valve.

f) Fabrice: leak test magnet LHe vessel for leaks to ambient air with 
a sniffer. TE/CRG contacted to check that no damage in the helium-4 pump
water circuit.

g) Yuri: tests on the microwave system and the new frequency counter.

h) Norihiro: install new AVS47 resistance bridge. Check thermometer positions
on the target holder. Connect the cables to the LN2 dewar scale and test it.