Minutes from target meeting held on 14th of November 2002 in 892-2-009 a) The broken roots pump WGK 1000 SP was unmounted on Monday. It was packed on Friday and is ready for shipping to Pfeiffer. The cost estimate of the reparation work will be done at Pfeiffer after inspection of the pump. b) A new offer for the Siemens Simatic S7-300 PLC system was received on Friday 8th November. M. Lafay modified the original plan by dividing the I/O-modules into 3 different ET200S submodules connected with a twisted pair Profibus cable to the CPU. The I/O modules are located to the control room, pump room and target platform. Each module, CPU and the display are fed from PS305 PSUs converting the 48 VDC to 24 VDC. Thus the system will operate also during the general power failure in the experimental area. For control room seven 2 channel analog input voltage modules are planned for pressures, flows and levels. In addition there is one 2 channel analog output module to control evaporator level and separator flow. Two 2 channel relay modules are used for controlling gate valve on still line and for still heater and microwave interlock. In pump room two 2 channel RTD modules are used to check the LN2 level in LN2 trap with pt100s. One 2 channel relay module is used to operate the LN2 filling valve. The open/closed status of LN2 filling valve, 4He and 3He electropneumatic valves are read with two 4 channel digital input modules. The same modules check also running status of the 4He pumps and flow of cooling water. At platform two 2 channel relay modules are used to open 48 V gate valve, to start the 48 V turbo pump system, to open horizontal and vertical screen bypass valves. Two 4 channel digital input modules check the open/close status of LHe transfer valves, presence of mains power at platform, cryogenic alarm etc. c) On Thursday 14th of November meeting was held in the experimental area with Klaus, Olivier, Rita, Gerhard M., TUM technician, Eric, Norihiro and Jaakko about LN2 usage from valve box to Silicon detector and target. Rita presented preliminary drawings about LN2 distribution to each detector station upstream of the target. TUM has 30 m long vacuum isolated transfer line, but the bayonet connection to the valve box needs to be manufactured. Close to the detectors there is a 3 m long distribution tube with cryogenic valves for each of the distribution lines. On the end of the distribution tube an exhaust line of LN2 is connected to guarantee higher fraction of liquid. Rita agreed that the same line could be used by target for precooling the magnet since the Silicon detectors are not going to be in place before the target loading platform is removed. Olivier said that he can remove the electropneumatic on/off valve from the valve box and replace it with a manual control valve. The service pressure of the 30 000 l LN2 reservoir is about 2 bars while for magnet cooling usually 1.3 bar dewar pressure is needed. After the first meeting there was discussion about RICH gas purifier LN2 cooling and target pump room LN2 trap cooling. Jaakko said that for open trap dewar we could have LN2 dewar filling area next to the pump room from where the LN2 could be filled with isolated line to the trap. The other possibility would be to build a new LN2 trap with closed dewar volume. The exhaust gas could then be safely conducted outside of the pump room. Peter was contacted to discuss about the idea of continuously cooled LN2 trap. Somebody should make the drawings for it, but the basic idea is quite simple. d) Summary of pipe work needed for 2003. Solid piping from 4He rotary to connection above barracks for cavity pumping line. The new magnet piping done before run 2002 is still missing its support. The horizontal and vertical screen outlet and cavity pumping line should be replaced with solid welded piping. Small diameter is enough for these lines. The main isolation vacuum lines now done with flexible piping could be mostly replaced with solid lines. New viton and metallic o-rings need to be purchased. e) Estimation from Alcatel about overhaul of rotary pump 3631B is 6855 euros for the material and 1600 euros for the work if done at CERN. Rough leak testing of the 4He pumping system will be done soon since the target system starts to be close to room temperature and thus there is smaller risk to condense water inside. The leak tightness guaranteed by Alcatel needs to be still verified and possibility of maintenance of the roots pump RHV2000 discussed. f) In the weekly COMPASS meeting there was discussion about downstream end material in the SMC magnet. Jaakko suggested that the downstream flange is opened anyway to check the materials inside and possibly to change the 0.5 mm steel window to aluminium one. The possibility to move target cells 10 cm downstream was discussed. The best option would be to unsolder the microwave guides on the cavity and make one new hole on each half. The estimate about benefits of movement is waited from Jean-Marc. Planning is needed for the modification work since the dilution cryostat needs to be removed and manufacturing work at workshop is needed. Jaakko estimated that the work could take 2 - 3 months. Before the system can be opened it has to be at room temperature first. g) Kaori said that coils #3 and #4 fit less accurately to the Curie law during the TE-calibration. With different baseline fitting regions 100 different TE-areas were calculated for each NMR-signal. A line was fitted to the areas to get averaged area. Different calibration constants were plotted into a histogram to get the mean value and the standard deviation. With parabolic baseline fit much broader histograms with higher standard deviation were obtained compared to the straight baseline fitting. Yale card gains can not be calibrated with the background data since for coils #1-4 there is only background file after retuning of the Q-meters. Kaori determined the gains after unloading of the target material.