Minutes from target meeting held November 18 2010 in 926-1-039

These minutes are available also from:

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

a) On Monday 9:00 to longitudinal 2.5 T field. Measure polarizations -76.5 %,
+76.2 % and - 75.3 %. Restart polarizing. Tuesday 16:00 -83.3 %, +83.8 % and
-82.2 % reached. Continue transverse data taking in 0.63 T dipole field.

b) Planning for the weekend before beam stop on Monday 22 November 8:00 was 
discussed.

c) Fabrice: water filter replacement in the pump room foreseen. Needs some
plumbing work. No brute cooling water available from December 14 to February
25.

d) Radiation level from the Drell-Yan hadron absorber was discussed. The 
thermal neutrons react with helium-3 and produce tritium, proton and 
0.76 MeV of kinetic energy. The glass fiber can also contain boron-10, which
has a high probability to absorb a neutron. The target metallic shell and 
liquid helium could help to thermalize the neutrons. The semiconductors are 
also sensitive to this dose. This includes the thermometers on the target 
cells. The magnet epoxy impregnated coil could also suffer and the o-rings 
age faster.