Minutes from target meeting held November 11 2010 in 892-1-B09

These minutes are available also from:

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

a) Back to longitudinal 2.5 T field Wednesday 4:12 with polarizations +77.5 %, 
-74.2 % and +76.4 %. Go to zero field for alignment run. At 6:00 ramp up the
solenoid to 2.5 T. Small residual polarization left. Start microwaves 6:30.
The up/downstream EIP 578B (Phase Matrix since 1999) frequency counter works 
in the beginning, but display becomes blank after one hour of operation. 
The microwave switch on the table for the up/down or central cell power is 
reconnected to the counter mixer diode and YIG-filter. In this way only one 
frequency counter can be used to monitor both of the generators.  Thursday 
16:00 polarizations -77.4 %, +77.5 % and -77.2 % reached and go to transverse 
0.63 T field. Yuri: normally two largest pumps are stopped and still heater 
is switched off in zero field. See 
http://wwwcompass.cern.ch/elog/target_polar/104

b) Three days of technical run on the last days of beam time or after the beam 
time was discussed. This would include repolarization of all cells to same
spin direction to see the effect of microwave leakage. Similar test was 
already performed at the beginning of the run. There is also some interest 
to test the melting of spin dipole ice in absence of Zeeman energy when 
the magnetic field is set to zero with high nuclear polarization. 

c) Angelo: new simulations on radiation dose from hadron absorber downstream
of polarized target. See
http://wwwcompass.cern.ch/twiki/bin/view/Drell_Yan/FutureAbsorber