Minutes from weekly target meeting 29th of July 2003 in 888 a) Jaakko was in a meeting at Oxford-Danfysik on 24th of July. The topics were the CERN cryogenic interface to the magnet, current lead design, safety valves and CERN pressure vessel safety code, heat exchanger for indirect precooling, heaters on the top of the current leads, external dump resistor, insulation test voltages, quench protection system and quench analysis. The new OST superconducting wire is specified to 1400 A at 2.5 T and 4.2 K. Magnet bore is steel AISI 304L. The photos from the visit are available at http://pccosrv1.cern.ch/compass/detector/target/odvisit24jul03/ b) Beam is expected to be back from 1st of August. On Sunday morning 27th of July we had a general power failure. The magnet security system was blocked after power failure and did not allow the restart. The problem was solved by Nicolas Bourguois on Monday. Small water leak from rectifier diode cooling water plastic tube connection. Trim PSU output current reading had to be re-calibrated. Microwave polarization reversal started from Monday evening. c) Kristin will leave CERN by end of the week. She finished the summer student report on dilution cryostat and PLC control system. Thanks for the good work. d) Yuris PCs hard-disk was broken. The results and Mathematica programs after last March were lost. e) Gerhard asked why the polarizations measured by the downstream NMR coils are now more close to each other than before. The reason is the better field homogeneity due to better values of the trim currents. Gerhard asked if the lower polarization measured by coil #3 could be due to inhomogeneous cooling of target material. There is no sign of significant temperature gradient however measured by the different thermometers. The coil #3 has about half of the signal size compared to the other upstream coils. This can be due to smaller amount of target material inside or some bad non polarizing material. In case of bad filling the material beads can even move inside of the target cell. The ratio between the areas by different coils during build up could be plotted to check consistency of the polarization measurements. Also the relaxation time in frozen spin mode could be compared between the different coils. f) Kaori produced histograms about TE-areas with different baseline settings. Some of the coils (e.g. #1 and #3) show less Gaussian distribution that the others. Kaori checked also the Yale card gains. g) Gerhard promised to bring the new IMPATT diode microwave generator in a few weeks to CERN. h) Matsuda said that four power failures happened last week. The diesel network went down on Friday and stopped the 3He pumps. On Sunday there was a general power failure at CERN. Typically it takes about 8 hours to recover the demineralised and normal cooling water on the platform after a general power failure. For the 3He roots pumps the normal drinking water seems to be always available. On Tuesday there was a power failure in the control room. On Monday one week ago there was a general power failure due to thunderstorm. i) Laura Stewart and Klaus Barth gave an offer for a new Leybold 4He pumping system. The system is similar to that used now at point 8 for cooling the LHC magnets to 1.8 K. The pumping speeds are the same as for the Alcatel pumps now in use, i.e. 2000 m^3/h for the roots and 630 m^3/h for the rotary. The roots in the offer (contrary to the pump used at point 8) has a vacuum tube motor and no lip seal on the rotating shaft. The rotary pump has been modified for pumping 4He. The price of the system is CHF 41 500. This does not include an electro-pneumatic gate valve that is needed to stop the back flow in case of power failure. There has to be also an inlet for the cavity pumping. Klaus promised to give us a price also for an additional double filter system that is used at point 8 after the pumping system. The pump system would be maintained with the NA Cryogenics service contract with Leybold and installation could be done in November - December by the NA operators if the order is done before September (otherwise the installation work can interfere testing of the new Oxford-Danfysik magnet expected in January).