Minutes from target meeting held April 19 2007 in 892-2-009

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2007/

a) The 3He flow meter display unit was replaced.

b) Yuri: the microwave system was prepared for polarization. Also the electron
spin resonance signal acquisition system was tested.

c) The oxygen monitor showed about 10 ppm impurity in returning helium gas. 
The value is recorded to the leak detector channel in the multireg. First 
weekly filter draining gave unmeasurable quantity of oil.

d) Kaori: NMR PC hard disk crashed on Thursday. Temporary replacement found.

e) The mixing chamber was filled with liquid helium on Wednesday. First 
polarized NMR signals at 1.1 K were seen on Friday. The preliminary analysis
of thermal equilibrium calibration signals indicate proton polarization
of 6 - 8 % in the middle cell. The coil #3 and #4 Q-meter outputs had to 
be exchanged at the NMR DAQ input. The up- and downstream target cells
were not polarized in the first test.