From settles@mppmu.mpg.de Wed Aug 22 12:03:51 2007 Date: Wed, 22 Aug 2007 12:02:43 +0200 (CEST) From: Ronald Dean Settles To: lctpc@desy.de Subject: Agenda WP#37 phonemeeting today 22.08.2007 Dear friends, Here is the agenda for today's LP phonemeeting... Cheers, Ron WP#37 22/08/2007 -------------------------------------------- Wednesday 8 August 2007 West Coast East Coast W.Europe Japan 07.00 10.00 16.00 23.00 To join, dial +494089981390, after a few seconds into an answer in German, type the code number 52872# (LCTPC#). Issues for the agenda ----------------------- 0. News 1. Cosmic-trigger news --Takeshi's email on the trigger: "I would like, if possible, to decide the basic parameters of the cosmic trigger counter (no. of the scintillator slabs and their lengths) so that we can ask about the price..." "I would also like to place the purchase of the necessary (maybe 30+10) MPPC in this week so that we can be sure to get them in time. The MPPC (with 100-400 pixels) seem to be becoming very popular." --Klaus replied with the following proposal. Exerpts from his email [the square brackets contain rewording by me, hopefully with the correct interpretation]: "...regarding the...scintillator slabs, we would need a width of about 945 mm just on top of the magnet. This would mean...a total of 6 slabs, which make a width of 1020 mm. Would it be an option if we have the slabs on top rotated by 90 deg? We would then have a width of 870 mm, which means we would lose on each side about 40 mm. If we then put 4 slabs together we would have a total length along the z-axis of 680 mm. This is just 40 mm longer at each...end of the TPC. In order to maintain the r-phi information we could place three more bars perpendicular to the first layer, with a gap of one bar in between. We could then ...[trigger on the muons in the z direction by having one additional]...slab, and no need for cutting the slabs." --To this Takeshi replied: "...[We might not] need to select special tracks at the trigger stage. In any case it is possible to rotate the top counters when we want. Well, to talk with Yuri, I need to know the length of the bottom counters." 2. LP1 fieldcage/endplate/electronics news. a. From Dan's email: "I have added material to the web page: http://w4.lns.cornell.edu/~dpp/linear_collider/LargePrototype.html . 2007-08-03 : a model of a Micromegas module 2007-08-17 - stress relief test plates - the plates deflect 7 microns with 2.6 millibar load 2007-08-21 - Gas seal test - there are no leaks" b. JAE connectors. Leif and Takeshi have been working. Hopefully they will update the following news I know about: Leif has found a European supplier that is not too expensive; he will order connectors for 2000 channels from them to make sure we have enough on time to start. Takeshi will be contacting the company in Japan to see if we can get the remaining 8000 channels at a cheaper price. 3. AOB --Info from Takeshi on PCMAG: "To make the cryogenic operation of the PCMAG safer and easier, we (Makida, Araoka, Keisuke and I) discussed with Joachim on August 20 at KEK. We agreed that we would write a proposal to EUDET for the improvement so that Joachim could include it in his budget (of 10-15k Euro)." --Next meeting in two weeks: 05.09.2007