Minutes from weekly target meeting held 17th of December 2001 in 892

a) The noisy roots blower in 3He pumping system was unmounted, packed and 
sent to Pfeiffer for reparation.

b) The 4He-pumping line was flushed 10 times by filling it with nitrogen
gas and pumping it empty. After this a leak detector was connected to the
line. On the level 3 10^-3 mbar l/s no leak was seen when spraying He gas
to different places along the line. It is practically impossible to get
lower background in the leak level after exposure of the pumping line to
helium. A leak at level 3 10^-3 mbar l/s would mean air flow of 1.2 10^-7
mol/s into the pumping line. This can be compared to the typical total 
flow of 4He: 10^-7/10^-1 = 1 ppm of air impurity. Thus if there is a leak
it has to be on the exhaust side of the pumps. The flow meter panel of the
magnet is already known to have quite big leaks, which are visible with a 
sniffer.

c) The cooling water of the pumps was drained to protect the piping in the
case that pump room temperature goes below 0 C during winter shutdown.
The room is kept warm by 3 electric radiators during this time unless
the power is cut for some unexpected reason.

d) The isolation vacuum was broken when the magnet bore temperature had
reached 290 K. The vacuum was filled with pure nitrogen to remove the
stress on the mixing chamber tube due to 1 bar pressure difference inside
and outside of it. 

e) Kaori has calculated all the areas for the TE-signals of D, 6Li and 7Li
at both temperatures 1.44 K and 0.97 K. 100 different baselines are used 
for each case and the median of the areas is taken. Norihiro has checked
the temperature of baratron. Baratron error needs to be still estimated.
Also more careful estimate for the temperature uniformity needs to be done. 
The baratron measurement shows small oscillation in the temperature,
e.g. between 0.972 K and 0.974 K with a period of half an hour. This
behaviour should be understood.
 
f) Norihiro is looking for a spare vacuum valve 7203/4CX250B for the 
microwave PSU.