Corrected summary: WP phonemeeting #26 18/04/2007 Dear friends, A few of you sent corrections, and thanks for them. They are included in the updated version below, and I have replaced the one on my web page by it at http://mppmu.mpg.de/~settles/tpc/lp/wpmtg/wpmtg.html Greetings, Ron WP#26 18/04/2007 -------------------------------------------- Wednesday 18 April 2007 West Coast East Coast W.Europe Japan 07.00 10.00 16.00 23.00 Present: Klaus Dehmelt Katusmas Ikematsu Akimasa Ishikawa Lea Hallermann Michael Hauschild Leif Joennson Sasha Kaukher Martin Killenberg Jean-Pierre Martin Takeshi Matsuda Luciano Musa Dave Nygren Dan Peterson Peter Schade Oliver Schaefer Ron Settles Akira Sugiyama Jan Timmermans ...anyone forgotten? Summary -------------------- 1. Introduction a. 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 are supposed to announce this is the decision, but they haven't yet. b. Request from Takeshi: As we discussed in one of our meetings, we need to "collect" and "write down" our overall LP1 schedule by collecting the present schedules of at least the following major components; test beam, magnet, field cage and HV, endplates, detector modules, electronics, DAQ, and analysis/simulation software (including the analysis of the field mapping results and its implementation to the analysis software). The first thing is collect the individual schedule from each person in charge, even if provisional. So we need time schedules (up to the end of the year at least) from: -test beam- TiesB et al -magnet mapping (including analysis)- LuciL, MichaelH et al -field cage- PeterS et al -HV- DeanK, KlausDem et al -endplates- DanP et al -detector modules- AkiraS, PaulC, TiesB et al -electronics- LeifJ, LucianoM et al -DAQ- LeifJ, MartinK et al -analysis/simulation software- PeterW et al -anything, anybody missed? Send a simple email text file to takeshi.matsuda@kek.jp who will compile them. 2. LP input a. Situation with the LP1 electronics (Leif et al). Lund has written up the latest DAQ status -> see attached pdf file, wp26DAQoverview.pdf. During Leif's report, Martin pointed out that the current trigger timing discussed is to +-10ns by the JRA1 group, whereas we need +-1ns for demonstrating the time-stamping capabilities of the TPC + Si detector (from SiLC) combination. This generated a lively discussion as to the accuracy we need. Luciano pointed out that the clock must be accurate to better than tenths of nanoseconds, and he and Sasha ask if the trigger should be better that a fraction of a time bucket (ca. 50ns). As Martin said, for collider operation the BX timing is very well known (to picoseconds), and that is what correspondes to the trigger timing in a fixed-target environment. Since the time-stamping capability is (and always has been) an important part of the TPC concept (see eg Section 2 of our written report to the Beijing tracking review at http://mppmu.mpg.de/~settles/trackingreview05022007-21.pdf), a +-1ns trigger-timing accuracy (or better) will be needed. According to Martin, the JRA1 group is aware that +-10ns is too much and is working on imporving it; see http://svn.phy.bris.ac.uk/svn/uob-hep-pc017a/trunk/www/Docs/tlu_v0_1_manual_eude t_note.pdf Leif did not go into details of the report since everyone has to have time to read and digest it. The points discussed were the two table at the end: the task list (see also Figure 2) and the hardware needed. For the task list (see also Figure 2) Lund/Bonn are looking for help from the collaboration. Leif and Jan pointed out that a new group is being set up to coordinate the software activities in Eudet, and Matthew Wing is being considered as convener. For the LP1 hardware, the number of channels is the important thing to understand. There are two components: the Eudet part and the rest. Eudet is providing 2000 channels of the new programmable preamp + 40MHz Altros; the money and manpower for this is guaranteed. For the rest, we have said that we need 10000 instrumented pads in order to perform the relevant measurements. This breakdown is made in the hardware table on the last page of wp26DAQoverview.pdf. Leif and Luciano went through some details of extra channels needed. The new programmable preamp and standard 25MHz Altros would be the components, since they will be the most readily available. The testing of the larger number of channels will need organization; Luciano said we should ask Lennart. After more discussion about price, delivery, testing etc, it was decided to continue details at a phonemeeting of specialists on Friday 20 April. (Meanwhile this has taken place and table summarizing the situation will be produced and distributed.) b. Plans for the LCTPC electronics (Luciano et al). The LCTPC electronics was review briefly by Luciano. Simulation work for a new preamp and new Altro in 130nm is proceeding well, and Luciano said the new chip should be available for testing mid-2008. Meanwhile the overall 0th-order endplate design should be understood well in advance, and an "Advanced endplate" meeting at the Eudet annual meeting October 8-10 in Paris, as suggested by Takeshi, should be realistic. Sasha has volunteered to help. A 1m^2 mockup would follow once the 0th-order design is understood. Dave Nygren is working on an alternative concept (see 2nd attachment, ILC_TPC_FEE.doc) for the LCTPC which will be considered along with the above version. c. What else? Dan has made progress. His email summarized the situation: New figures for the endplate assembly, dated 2007-04-17, and model drawings of the gas seal test, dated 2007-04-10, are shown on the usual web site: http://w4.lns.cornell.edu/~dpp/linear_collider/LargePrototype.html . Drawings for the gas seal test go to the lab shop on Wednesday 18-April (today). For the endplate, we are ready to make preliminary drawing for cost estimates at commercial shops. 3. AOB Next meeting Wednesday 25 April, usual time. Questions being discussed (some are addressed above): -Gap of 25mm for SiLC. -Accuracy needed from SiLC. -Fieldcage thickness. -Panel sealing. -Panel shape. -Connector positions. -Drawing of field-mapping gear (Marcello Losasso). -Identify who can analyze the field-map data (CERN or DESY students being discussed). -Plan hardware and software steps needed for coordinate systems for the field-map, the PCMAG and the TPC systems. -Understand relation between TPC DAQ (Alice, Lund, Bonn) and EUDET JRA1 DAQ for the pixel telescope. -Understand relation between TPC analysis and EUDET NA2 computing/analysis framework. -Plan LP1-hardware-mechanics steps up to end 2007 . -Plan LP1-electronics steps up to end 2007. -Plan LCTPC-electronics steps up to end 2007. More from previous emails: ----Akira has put his panel studies on the web for everybody to study and comment on: http://www-hep.phys.saga-u.ac.jp/ILC-TPC/ Akira reported that they have successfully built and seen signals from a double-thickGem-detector stack. ----The accuracy for the SiLC was discussed. Ron made the following suggestions (comments are welcome) and Ties thought we should cross-check them: For r/phi, we should stick to the value used in the Tesla TDR and the present DODs for LDC and GLD, namely 10 microns. Multiple-scattering arguments should not play a role since the LP will be put in a ~100GeV beam in a couple of years. For r/z, the silicon will be used to time-stamp the TPC tracks. Since the TPC driftvelocity is about 50microns/ns, then the SiLC should be accurate to about 50microns in r/z so that we can time-stamp to about 1ns. [ Part 2, "" Application/PDF 141KB. ] [ Unable to print this part. ] [ Part 3, "" Application/MSWORD 33KB. ] [ Unable to print this part. ]