Minutes from target meeting held October 28 2011 in 892-1-D20

These minutes are available also from:

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

a) Start to polarize on Friday 14:30 with negative solenoid current from
-87.6 %, +86.5 % and -86.1 %. Stop polarization at 21:00 with values 
-90.0 %, +88.1 % and -88.6 %. Continue to polarize on Saturday 15:30
from -88.8 %, +86.9 % and -87.9 % with positive solenoid current.
Stop polarization at midnight with values -90.2 %, +88.4 % and -88.9 %.
Top up polarization with negative solenoid current on Tuesday from 15:00 
with polarizations of -89.6 %, +88.8 % and -87.8 %. At midnight values
-91.4 %, +90.2 % and -89.7 % reached. Start frozen spin mode.

b) The SPS MD started on Wednesday morning 8:00. The solenoid ramped to 1 T
with negative solenoid current at 10:00. After this at 12:00 field rotation
was done to positive solenoid current 2.5 T.

c) The planning after the beam time was discussed. The physics data taking 
will end on Monday November 7 8:00. After this the helium-3/4 mixture is 
removed from the mixing chamber and helium-4 is condensed for thermal 
equilibrium calibration.

d) Plot preliminary polarization for SPS period P5. See
http://wwwcompass.cern.ch/elog/target_polar/146

e) Fabrice: the diffusion pump cooling water temperature is rather high now
about +30 C.