Minutes from weekly target meeting held 7th of February 2002 in 892-2-009

a) We had a meeting with O. Pirotte and J. Cosson to discuss about the work
needed to move the magnet electropneumatic valve. Pirotte promised to make
estimation of the cost.

b) Norihiro summarized the temperature data during the TE-calibration. Four
thermometers inside mixing chamber were considered: the Baratron 3He vapour
pressure at upstream end, TTH1 speer in center of upstream target cell,
TTH2 speer in center of down stream target cell and TTH4 RuO in upstream 
end of mixing chamber. The 3He vapour pressure is used as the real temperature
in the TE-calibrations for all the coils. The error in Baratron temperature is
2 - 4 mK and the value does not depend on the magnetic field. The errors 
in the resistive thermometers are 2 - 28 mK. TTH1, TTH2 and TTH4 are 
also sensitive to magnetic field. Typical maximum deviation from Baratron
is about 20 mK at 0.97 K and 50 mK at 1.44 K (gives about 2 % and 3 % error
to polarization). 

There was discussion on how to use this temperature data in the 
TE-calibration. Jaakko suggested that the temperature deviation from Baratron 
reading is included to the error of polarization. Yuri suggested that only 
the Baratron temperature error is used in the polarization error. Also the 
field dependence of the thermometers was discussed (Jaakko pointed out that 
CBT primary thermometers would not depend on the field to accuracy 0.1 %). 
The field dependence of thermometers should be checked during the next 
TE-calibration. We could also exchange some of the thermometers.

c) Planning for spring 2002 was discussed briefly. There is some preparation
work to be done before April, e.g. moving electropneumatic valve, modification
of target holder, tuning new NMR coils, installing pt100s, installation of 
roots pump. The isolation vacuum is pumped on week 14 and leak testing is 
done. On week 15 the magnet is cooled to 100 K with LN2. On week 16 we load 
the target material. The TE-calibration will start on week 19 and material
polarization on week 20. 

d) Next summer we are going to have 106 8 hour target shifts for the target
group members at CERN (Fabrice, Jaakko, Kaori, Kenneth, Norihiro, Yuri). The 
remaining 212 shifts we expect to be filled by other collaborators. The total 
run period is from 27th of May to 9th of September. The target shifts will
start before this on week 16, but these 126 shifts are taken care by the 
target group only. Training for the target shifts needs to be organized. 
For each week there is a week target coordinator. We would need information
of target members not permanently at CERN about their availability to the
shifts (Alain, Gerhard, Gunter, Jacques, Jean-Marc, Peter, Stefan, Werner).

e) Jaakko fitted the D NMR-line to the memory function coming from book of
M. Mehring: "Principles of High Resolution NMR is solids". The integrated area
of fitted curve was 0.5 % smaller than the raw data. The second and fourth
moments used in the fitting agree quite well to the calculated ones from
dipole-dipole interaction between D and 6 x 6Li's. Calculating 1st - 4th
moments from the NMR spectrum directly did not seem to produce clear 
dependence on the polarization. A more careful analysis should be done to 
confirm these results.

f) TE-calibration is in progress. Yuri is checking the data with Mathematica
and Jaakko with root. The data from Kaori (with LabVIEW) has been ready for
couple of weeks. The dispersion in the polarization values between different
coils is still unexplained (crystal orientation?, filling factor?).

g) Kaori promised to add also polarization points above 40 % to her plot on
the EST-data between D, 6Li and 7Li. She will also try to fit the proton
data to the theoretical curve. On the weekly meeting Mallot proposed that
taking the signals of 6Li and 7Li is not necessary during the field rotation
since the data seems to fit the theory quite well.