Minutes from target meeting held October 9 2015 in 892-2-009

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2015/

a) On Monday morning rotate 0.6 T dipole field to 2.5 T solenoid and measure
target polarization.

b) On Wednesday morning rotate 0.6 T dipole field to 2.5 T solenoid and
measure target polarization. Go to zero field for 30 minutes and restart
to build positive polarization to upstream target cell and negative to 
downstream cell. 

On Thusrday morning 1:00 the upstream EIO microwave generator tube 
oscillation stopped and was restarted at 7:00. While restarting the EIO 
outlet wave guide temperature reached 32 C and the microwave power supplies 
were stopped by the PLC interlock. Cleaning of EIO water cooling pipes was 
discussed.

c) Norhiro changed the threshold for microwave interlock from +32 C to +40 C.
Christophe implemented closer tracking of polarization build up process to 
the COMPASS DCS system. Now if the polarization starts to drop in 2.5 T
solenoid field the shift gets an alarm.

d) Kaori: update relaxation time table in transverse 0.6 T dipole field.
See https://wwwcompass.cern.ch/elog/target_polar/203

e) Johannes: RP will check the level of radioactivity at the upstream
flange of the target holder before unloading is permitted. Gloves and 
white laboratory coat could be worn for extra protection. It is a good
idea to wash hands after the work.