Minutes from target meeting held October 29 2010 in 892-2-009

These minutes are available also from:

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

a) Back to longitudinal field on Wednesday 17:10 with polarizations -83.0%, 
+81.7% and -81.8%. Start microwave reversal 20:15 after alignment run. Friday 
9:10 polarizations +80.8%, -79.0% and +81.2% reached. Start transverse data 
taking in 0.63 T dipole field. 

b) Thursday 11:00 cooling water intervention to the helium liquefier. Normal
operation recovered by 13:00.

c) Helium-3 recovery in case of crack in the glassfiber mixing chamber was 
discussed.

d) Planning after the beam time was discussed. Before the target loading 
platform can be installed, the upstream detectors and concrete blocks need 
to be removed. The dominating error in the TE-calibration is the proton NMR
signal from the target holder. Thus after the unloading an empty cell 
calibration would be beneficial.

e) Jaakko: plot and fit polarization build up October 17 - 20. The fit gives
a conservative estimate of polarization increase in next few hours. Also
the microwave frequency and speer resistor vs. polarization was plotted.
See (speer middle and down interchanged on the plots)
http://wwwcompass.cern.ch/elog/target_polar/99
http://wwwcompass.cern.ch/elog/target_polar/100