Minutes from target meeting held January 8 2010 in 892-2-009

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2010/

a) Start pumping isolation vacuum on December 14. December 16 vacuum of 
3 10^-2 mbar reached with rotary pump. Connect leak detector to the vacuum
vessel. Gas helium into separator, vertical screen and horizontal screen lines.
Fill also helium-4 evaporator. No leaks to isolation vacuum detected.
Let gas into helium-3 pumping line and mixing chamber. No leaks detected into
isolation vacuum. January 8 spray helium outside of vacuum vessel on 
the o-ring joints. No leaks detected. Pressure of 2 10^-2 mbar reached with 
rotary pump. The PT48B vacuum pressure display unit has disappeared during
the storage.

b) Cool down new target cells made of teflon mesh on December 15. Fill the 
upstream cell with quartz grit. The filling works though the longitudinal
teflon support rods bend due to the weight inside the cell. The measured
cell lengths 27.5, 56.5 and 28.5 cm +- 1 cm do not change significantly
when cooled to LN2 temperature. 

c) The pump room temperature on January 7 morning about +3 - +4 C after cold
night. The roots water circuit was purged before winter shut down and needs to
be reconnected to the new water supply.

d) The cavity pumping line from the concrete wall to the target platform was 
found to have been cut and reused for something else during the storage. New 
line needs to be welded. 

e) Yuri: test directional coupler with IMPATT diode to reduce reflected power.
Two times more power possible if successful.

f) Kaori: new PXI create for NMR expected in two weeks.

g) Jaakko: update list of cables and o-rings in the Wiki

http://wwwcompass.cern.ch/twiki/bin/view/PolarizedTarget/PolTargCable

http://wwwcompass.cern.ch/twiki/bin/view/PolarizedTarget/PolTargOrings