Minutes LCTPC WP meeting #106 on June 3rd, 2010 ===================================== Present: At DESY: Steve Aplin, Klaus Dehmelt, Ralf Diener, Christophe Rosemann, Peter Schade, Jan Timmermans EVO/phonebridge: David Attie, Paul Colas, Michael Lupberger, Wenxin Wang, Jochen Kaminski, Martin Killenberg, Takeshi Matsuda, Dan Peterson, Ron Settles 1) No general news items 2) PCMAG/LPTPC status: - lifting stage has been re-assembled; will install position measuring device; everything else idle. - there is not much news from Akira Sugyama about future data taking, so it is assumed that the next run with GEM modules is still foreseen for September - Paul Colas announced planned testbeam data taking for 21/6 - 8/7 at CERN with Micromegas in testbox in high intensity beam with particle rates up to 10-20 kHz/cm^2 3) News from groups: Japan - started on 3D-Maxwell electric field calculation, trying to find solution for distortions by metal pins holding the Gems Saclay - Paul Colas (see slides): Detailed analysis of testbeam data from 5 modules (4 of which with resistive anode) in progress, Need to implement the magnetic field map in the analysis. Latest results indicate a larger value for N_eff. For the analysis of the Victoria laser data (taken last year) contacts have been established with Saha Univ., Kolkata and Victoria. First prototype of the new electronics (still based on T2K AFTER), mounted flat on the module, should be available still in June, with tests in fall 2010. Production and characterization of 9 modules foreseen in 2011. Power pulsing test with Saha and Carleton in 5T magnet is in peparation David Attie: Working on the next test of the 8-chip Timepix/Ingrid module; plan is to test with Fe55 source with the module in the transport gasbox, using Ar/iC4H10 95/5 mixture. Jan T. suggested to start first with a He/iC4H10 80/20 mixture for its more stable HV behaviour Steve Aplin - current dimensions of the TPC in the Mokka simulations was distributed and shortly discussed (see slide). It was agreed that a more up-to-date version of these dimensions would be handed to Steve in two weeks time, to be used in the future large scale simulation for the DBD studies. 4) News from AIDA (Paul Colas - one slide appended to Paul's slides file with Saclay news) Budget negociations almost finished; the LC-TPC activities will be cut by 15-16% (overall cut 20%): PCMAG improvement (130 kEur), CERN MPGD workshop (200 kEur), S-Altro electronics (95 kEur Saclay, 60 kEur Lund), Timepix readout (150 kEur Bonn+Mainz+Nikhef). If finally approved, start of project foreseen for February 2011, for 4 years. 5) WP5 discussions Takeshi Matsuda reported on the S-Altro discussions that took place at CERN earlier in the week, see the slides by Luciano Musa on the status and plans for the S-Altro and slides by Takahiro Fusayasu on the Advanced Endplate Dummy module for the power pulsing and cooling tests. The 16-channel S-Altro prototype submission for an Engineering run will be in June. 6 wafers will be produced containing 500 circuits/wafer. 50 samples will be packaged for a first characterization, expected to be done in Nov-Dec 2010. Takeshi commented that the development and current submission of the 16-ch prototype has been fully paid by CERN (small part EUDET, large part by Alice). If LC-TPC is going to use significant numbers of this 16-ch chip, we have to start thinking of how to pay for (additional) chips. Five PCBs of the AED will be produced, available early July. Tests with water cooling will be performed during summer. Hope to test with CO2 cooling at Nikhef in fall 2010. Dan Peterson updated on the development of a low material endplate for LP1 (and ILD), going for a spaceframe model being light and 3-times or >3-times more rigid than the lightened all-Al or Al-C hybrid respectively. At present main effort is going into modelling the ILD endplate, which is very time consuming on his current computer. For the FEA a simplified model must be used. See Dan's slides. A long discussion followed on the present model, which contains 8 rows of modules having similar size as the current LP1 modules. Remember that Saclay/DESY studies have currently 3 or 4 rows of modules. It is clear that these two model studies should be continued to compare their respective characteristics. Ron Settles argued in favor of the 8-row model with the smaller modules, where we have acquired construction and working experience with. Ron Settles updated his overview of the TPC parameters for ILD integration and the DBD (see his slides iteration #4). Important new information was the result of the study by Mark Thomson and Steve Aplin on the PFA performance (i.e. jet energy resolution) as function of the X0 thickness of the TPC endplate (from 15% X0 to 60% X0). The effect is (surprisingly) small. It is good to strive for 15% X0, but 30% X0 gives no significant degradation on the jet resolution. 6) AOB: Jan urged the groups to apply for EUDET Transnational Access support for the upcoming beam tests, as the EUDET-JRA2 activity is running behind in the planned numbers of access to be provided (risking to miss specific funding by Brussels, like compensation for liquid He usage). The rules are simple: funding requests should be made by a group whose leader and the majority of the members come from non-German member state or associated state. There should therefore be also support available for a few of our Asian or North-American colleagues. Both Leif Jonsson and Paul Colas agreed to prepare requests for "access" for the coming test beam campaigns. This should be done a few weeks BEFORE the start of the campaign. Slides with some instructions are added on the indico agenda page and can also be found on the EUDET web pages www.eudet.org Next meeting: 17 june 2010 14:30 CET JT