Minutes from target meeting held October 22 2010 in 892-2-009

These minutes are available also from:

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

a) From 0.63 T dipole field to 2.5 T solenoid on Sunday morning 8:30. Measure
polarizations +76.6 %, -73.3 % and +75.6 %. Monday at 19:00 to transverse
dipole field with polarizations -79.7 %, +81.2 % and -79.2 %. Restart
polarizing on Tuesday morning 10:30. Wednesday 9:00 -84.8 %, +83.6 % and 
-84.7 % reached. Go to transverse field for interventions in the experimental
area and back to 2.5 T at 17:00. The full 2.5 T field kept until Friday
17:38. Transverse field started after that. The foreseen microwave
reversals are planned on October 28 and November 10.

b) Jaakko: reconnect power for the cavity pumping line and horizontal screen 
pipe heating cable. The cable was off since the circuit breaker below platform
on Saleve side is sensitive to the stray field from 2.5 T solenoid.

c) TTH4, TTH5 and TTH6 scales need to be changed for the polarization build up
and back when in frozen spin mode.

d) Placement of new diffusion pump control system was discussed. If the PLC
substation is put into control room rack it will not be in high radiation
area during the future Drell-Yan programme. Radiation sensitivity of all
the other electronics on the target platform was discussed. 

e) Yuri: good stability of the microwave generators during polarization build 
up. Good balance between upstream and downstream cells. Slower build up time 
due to old target material. Microwave stopper may have some leakage. New 
microwave cavity for Drell-Yan planned. Microwave feeding needs to be done
carefully.