Subject: Summary update WP phonemeeting #27 25/04/2007++ Dear friends, Here is the updated summary of last week's meetings, including Wednesday's phone meeting and additional information (denoted by ++) that was collected on Thursday and Friday. So whether you attended the phonemeeting or not, please read the summary to get all of the info. Let me know if you have any additions/corrections... Greetings, Ron WP#26 25/04/2007 -------------------------------------------- Wednesday 18 April 2007 West Coast East Coast W.Europe Japan 07.00 10.00 16.00 23.00 Present: -Paul Colas -Klaus Dehmelt -Ralf Diener -Madhu Dixit -Katusmas Ikematsu -Akimasa Ishikawa -Lea Hallermann -Leif Joennson -Sasha Kaukher -Dean Karlen -Martin Killenberg -Vincent Lepeltier -Takeshi Matsuda -Dan Peterson -Peter Schade -Oliver Schaefer -Ron Settles -Jan Timmermans ...anyone forgotten? Summary -------------------- 1. Introduction ++ News A new version of the reviewer's report from Beijing has been "released"; for this it seems that each of the R&D groups should submit an appendix containing their opinion (ours disagrees in several places). The WWSOC-chairs have announced the decision, and asked for appendicies from the R&D groups by the end of the month. The present form of the report can be found at the ILC Wiki site http://www.linearcollider.org/wiki/doku.php 2. LP input a. Klaus Dehmelt reported on the SiLC status. They have made some drawings, ProtoSiTPC.pdf, which are attached to this mail. The gap needed by SiLC between fieldcage and magnet is 35mm, and in our discussion we decided to give them 40mm to have a safety factor. The r\phi detectors are the kinked ladders in yellow and cover most of the TPC. The r\z (time stamping) detectors in dark blue are from CMS. They cover only a small part of the drift region, and our discussion concluded that this is o.k. since we just want to demonstrate the time-stamping technique . The r\phiand r\z resolutions will be 10-12 and 20 micrometers, respectively, which agree with our values (see the summary of the WP#26 meeting). b. Peter Schade reported that the fieldcage thickness remains at 20mm plus 'a little bit', where the latter will be part of the extra 5mm safety factor in the fieldcage-magnet gap (see above), i.e. on the outside of the fieldcage. The 'little bit' is needed since the outer surface is not precise mechanically. c. Dan will take these changes into account. The 'stay-clear' radius is now 362mm (including an extra 3mm clearance inside the field cage), so that it is still larger than the 357mm used. Dan explained the stress-relief testing in progress, see http://w4.lns.cornell.edu/~dpp/linear_collider/LargePrototype.html (at the bottom, 2006-09-12 etc). Six such aluminum (6061) structures have been fabricated with 0.75 mm oversize. They will undergo different stress-relief scenarios (heating, cooling or nothing) after which the oversize will be cut down to 0.25mm. They will again be stress-relieved and the material will be machined to final size. Before and after each step the pieces will be measured on an automatic machine (~300 points per measurement). Also the material hardness will be measured. Finally, the gas-seal test described at previous meetings (see 2007-04-10 etc on Dan's website) has not started yet, partly because the technicians are busy with the stress-relief tests. c. Situation with the LP1 electronics (Leif). Since last week, Leif has started putting together cost scenarios and milestones for the LPTPC electronics; this is not ready for distribution yet. All numbers are being checked, but based on preliminary ones from last week, it looks like we will be needing for the 10000 preamp channels ca. 100kEuro, if the yield of Altro chips from the Star/Mips-TPC order is high enough (we should know this in a week or so because Lund has started testing Star Altros). Klaus Desch suggested that we can try to get about 20kEuro from several of the groups in order to generate the cash needed. The CDC (Japanese) and Bonn groups have each offered 20kEuro, so this is a good start. ++ Luciano's deadline for knowing how many preamp channels we want order is week 19, so at the latest we should decide at the next meeting, WP#28 on 9 May 2007. Therefore this understanding of the costs and contributions is now urgent! d. Trigger timing. Leif has taken up contact with Matthew Wing about this issue. We are asking for +-1ns which is more exact than other JRA1 (trigger telescope) groups. Sasha proposed a solution using a TDC. Leif, Martin (who raised the issue at the last meeting) and Sasha will follow up this question by discussing further with Matthew Wing and others. Related to this Sasha asked about the position of the connectors; Lund and CDC have different scenarios, so Sasha will iterate with those groups. ++ e. Plans for the LCTPC electronics. Luciano and Ron discussed this at CERN on Thursday 26 April. The simulation work is proceeding well for submission later in the year, as said last meeting. What we need in addition is an understanding of the overall 0th-order endplate design. This should proceed in parallel to the normal WP work for LP1. The suggestion is the following and feedback is welcome: --Beginning June: Video/phone meeting with prepared talks. --End July: Video/phone meeting with preparted talks. --October 8-10 Eudet annual meeting in Paris: face-to-face "Advanced-endcap" meeting with prepared talks (as proposed by Takeshi). This leaves the possiblity for an additional meeting in September if it turns out the be necessary. f. Panel size and connectors. Paul asked about the panel size to start the design of the Micromegas panel. Dan will need a few days to make new drawings. In the meantime Paul can start his design with, from Dan's website, the left drawing under "2007-03-20 Bounding Boxes on Endplate", the ones under "2007-03-27 Readout Module" and relevant ones from "2007-04-10 Gas seal test" (and others perhaps) and iterate from there. Leif will send info about the connectors. ++ g. Software meetings. In reponse to the question the best way to organize our mechanics/electronics/software meetings in future, Peter has provided the following information about the software: The main focus at the moment is on the development of a common reconstruction, analysis and simulation framework called MarlinTPC which is based on LCIO. You can find some information about the project under http://www-flc.desy.de/ilcsoft/ilcsoftware/marlintpc/ If you want to get informed about new MarlinTPC revisions, releases or meetings you should subscribe to the MarlinTPC mailing list by going to https://lists.desy.de/sympa/info/ilcsoft-marlintpc and click on "subscribe". 3. AOB The next TPC meeting will be before the Orsay LC Softare meeting on Wednesday 2 May 11:00 to ~12:30; there will be a telephone connections (see below). Since this time is not a good for America, and agenda will be sent so that you can provide input by email. Here is info from Vincent: ++ Room reservation at LAL for a TPC meeting on May 2th morning, room 129 in the main bulding. Since it is not easy to access to this part of the lab, the best is to meet at 10:30 at the main entrance to LAL, building 200, where the registration for the software meeting is. We will then go to the TPC meeting room from there. ++ The telephone meeting will start at 11:00: TEL.BAT.200, phone number 01 56 78 86 88, title 'ILC-TPC meeting'. [ Part 2, "" Application/PDF 1.1MB. ] [ Unable to print this part. ]