Minutes from target meeting held July 29 2011 in 892-2-009

These minutes are available also from:

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

a) Monday 14:00 - 21:00 topping up polarization from +83.6 %, -83.9 % and 
+85.1 % to +87.2 %, -89.4 % and +88.4 %. Continue to polarize Wednesday 
13:30 - 21:00 from +86.5 %, -87.9 % and +87.6 % to +88.4 %, -90.3 % and 
+89.0 %. Polarize on Thursday 12:00 - 22:00 from +88.4 %, -89.5 % and +89.0 %
to +90.2 %, -91.7 % and 90.6 %. All the build ups were done with a positive 
solenoid current sign.

b) Yuri: NMR rack water cooler ran empty Thursday 23:00. The water 
temperature measured by pt100 increased from +25 C to +28 C and polarization
was not measured correctly. Refill the cooler on Friday morning 9:30 and
the normal polarization values were recovered.

c) A web camera was installed into the target control room to see the
alarms from the magnet and dilution cryostat systems.

d) Calculate 2.5 T relaxation rates from 2011. Typically loss of 0.3 %/d
for up- and downstream, and 0.6 %/d for central cell with negative
polarization. See http://wwwcompass.cern.ch/elog/target_polar/123

e) Christian: relaxation times in 2.5 T field 4000 - 11000 h depending
on the coil. See http://wwwcompass.cern.ch/elog/target_polar/125

f) The preliminary polarization plot from SPS periods P2 and P3 in
http://wwwcompass.cern.ch/elog/target_polar/122

g) The microwave parameters from polarization build up July 10 - 11
http://wwwcompass.cern.ch/elog/target_polar/124

h) Update dcsread utility. See 
http://compass02.cern.ch/elog/target_polar/126