Minutes from target meeting held on 7th of November 2002 in 892-2-009

a) Jaakko presented preliminary TE-calibration results done with Root.
A straight baseline was fitted to the residual background with 10 different
cutting windows +-10 to +-20 kHz around the center of the NMR-signal. 
The first calibration at 1.01 K started from 19th of September 18:20 and 
ended 20th of September 16:00. Second calibration at 1.33 K was from
20th of September 22:40 to 21st of September 12:30. A straight line was
fitted to the areas versus time plot to get average area. The 1.01 K and
1.33 K results were fitted to Curie law c/T, where fitting constants c
gives the final calibration constant. 

b) Yuri said that the temperature error should be determined for spin 
temperature during TE with about 3 h magnetic relaxation time. With 1.5 % 
the linear and parabolic baseline fits agree with each other.
Norihiro suggested to shift NMR center frequency to remove jumps from
the background files. Jaakko suggested Norihiro to make a model for spin 
cooling with spin-spin system coupling to lattice, which is coupled to 
the phonons or rotons in surrounding 4He. During TE-calibration filling
of LN2 trap was seen to produce 4 mK jump in temperature. Norihiro said
that this should be avoided next year.

c) From LHC/ECR/Cryolab Laetitia gave information about oxygen and humidity 
analysers of Gruter & Marchand. The analyser are in level 0 - 100 ppm,
which is too sensitive in general oxygen leak checking although in normal
operation this should be sufficient. These analyser are in 2000 - 3000 euro
price range. There is also information about humidity sensors.

d) Communication from Gerhard M.: OIS magnet has been opened at Oxford-
Danfysik. Visually the impregnation of coil winding seems to be bad and
there are blisters in epoxy.