Minutes from target meeting held on 11th of October 2002 in 892-2-009

a) The target material was successfully unloaded on Monday 7th of October.
The mixing chamber was at 78 K just before pulling out of the target holder.
Liquid Argon was used to float the beads for easy collecting from the surface.
After unloading the material was weighted while keeping it cold below 100 K
just above the surface of LN2. The preliminary result gives about 190 g for
downstream and 170 g for upstream. This corresponds to filling factors of 
0.56 and 0.50 respectively. After weighting the material was stored into 
LN2 dewar in the pump room.

b) The NMR cables and thermometers were checked after the unloading. The TTH6
now close to 100 um steel window had 100 kohm ground contact probably due to
the copper mesh around it to protect it from microwaves. The NMR coils have
stayed well in their places. The same is true for the thermometers and no 
obvious problem can be seen. The resistances of the cables and coils measured
from the SMA connector are in the normal range. At the SMA connector inside
the mixing chamber the cable for coil 5 (small inside target material) has
broken outer conductor. The downstream coaxial cables for coils 6 - 10 are
bound together. For upstream coils 2, 3, 4 the cables are bound together 
and go in different path compared to downstream cables. For coils 1 and 5 
the cables go along the downstream cables. Thus there are extra inductive
ground loops, which couple to the coils. Otherwise no problem is visible.
Next week the influence of the thermometers to the coils will be tested by
connecting the cables to Q-meters and shorting/disconnecting thermometers.
Jaakko suggested to use LCR-meter or some other method to measure mutual
inductance between the coils.

c) Yuri started to make the first analyses of TE-calibration data. In coil
#3 sometimes big correlated noise or oscillation is seen. There are also
sometimes jumps in the background or small modulation close to the NMR line.
Thus Yuri suggested that the NMR-lines should be inspected one by one.

d) Kaori had produced the first TE-calibration results at 1.0 K and 1.2 K.
Since the calibration was done coil by coil for upstream, there is less
statistics available. This is reflected in the error, e.g. 3.2 % for #1,
2.5 % for #3, while for the downstream coils it is 1 % or better.
Kaori presented also plots of signal area vs. 1/T to show accordance with
the Curie law.

e) Norihiro started to work on the thermometer data to determine the 
temperature during the TE-calibration.

f) Norihiro contacted Siemens for the service of multireg C1732. The service
costs 3 keuro with change of print head. Also the GPIB communication problem
with NI card should be examined. 

g) Jaakko presented the plan for the Siemens Simatic S7-300 PLC system.
This consists of PSU unit 230VAC to 24VDC, CPU 315-2DP, three analog input
modules for pressures, flows, levels and temperatures recorded in multireg,
one analog output module for still heater, separator flow and evaporator
needle valve, digital input module for status signals from pump room and
platform, and digital output module for controlling valves and pumps
in pump room and on the platform. Price estimate for the system is expected
next week.

h) Fabrice sent dilution cryostat PC for upgrade of CERN Windows 2000.
NI card for pt100 thermometers is ready. The new PC is still waiting for the
display. Fabrice is checking different database software for recording
and retrieving measured dilution cryostat parameters.