Feedthrough Meeting 29/05/98 present: D. Axen, P. Birney, M. Dobbs, A. Dowling, M. Fincke-Keeler, T. Hodges, R. Keeler, R. Langstaff, M. Lefebvre, P. Poffenberger - Status of Pin Carrier Order Dave Rahm has contacted PCT and Glasseal recently, and the pins are still expected in June. Following some work from C. De La Taille in Orsay, it was proposed that the ground connection could be improved by gold plating the pin carriers (in the relevant areas) and the connectors (in particular the vacuum cables). For the pin carriers, this is mainly a question of money: PCT has given the following gold plating quotes to D. Rahm: $US 200 each for large order $US 1400 each for small order We are awaiting quotes from Glasseal. Margret and Ernie to look into the implications for the vacuum cable connectors (currently Be-Cu-Ni). Dave pointed out that since the vacuum cables are in vacuum, gold plating was not really needed. Furthermore, Richard reminded us that the very likely reason for the ground connection problems encountered in Orsay is the faulty connector from BNL used for those tests: the crimping position was not correct, resulting in an overstreched ground clip, which then reduces the quality of the ground contact. This problem is well understood by Ernie, Margret, and our BNL colleagues. - Status of Model Margret and Alisa have drawings sorting out the orientation of the various components. Paul to order the material for the model pigtails and for the model vacuum cables. The final decision on the wire diameter for the dummy pigtails will be made soon. Margret to verify the length of the EM pigtails (are they 0.85m ?). We agreed that the dummy pigtails should be longer than the EM pigtails. 1m and 1.5m are considered, Margret and Paul to make the final decision. - Vacuum Cable Status Ernie has received yesterday the plated through spacers produced by Strataflex. Ernie now starts the assembly of the connectors on the striplines. It is hoped that we will receive in Victoria some complete vacuum cables sometimes next week. Margret and Ernie are to look into the procurement of the material needed for a larger order. - Refrigerator Project Status The refrigerator is very near completion: remaining tasks include some weld and valve checks, and follow up on the casters order for the stand. The power test on the cryo cooler are proceeding. The new temperature controller is operational. - Assembly and Test Procedures Margret and Paul have started a first draft of a note on assembly and test procedures. Our goal is to have a first pass document for the coming LAr week (July 6-10). David Lissauer has been raising again the need to produce such documents. Michel to give to Margret the skeleton documents that David has in mind [done, not very useful]. - Leak Test Setup Status Paul reported on the leak test setup status. The cold part is now completed, and holds vacuum (currently at 7 x 10**-7 mbar). Material for the pigtail bucket is ordered. It was noted that the scroll pump seem to produce vibrations at the turbo pump level; these are to be minimized. Work is required on the design of the test platters, with the most urgent one being for the pin carrier tests. - Electric Test Setup Status Margret reported on the status of the electric test setup. The DC test box has been received, and works on stand alone mode. Dave and the UBC electronics shop are producing a pulse fanout that will allow simultaneous pulsing of many channels, as in the Orsay test setup. It was not clear which one of the DC tests or the transient (daisy chained) tests would end up the first one to be used in our test procedures. Both will be investigated. - Bellows, Flanges, Funnel Roy reported on the status of the bellows, flanges and funnel design. Final drawings are expected from BNL early next week. In particular, Roy and Pierre Pailler are in favour of not using a pipe thread for the outside pipe fitting. Roy has identified a suitable type of fittings. The preferred funnel tube is now back to the original one, the thick tube being not compatible with the automatic cutter. The funnel/bimetallic junction is a Butt fit. Roy is to check the drawings upon receipt. We agreed that, if only minor modifications are needed, Roy would make whatever minor modifications are necessary and send a final drawing back to BNL. If D. Rahm is happy with them, Michel would then let D. Rahm, D. Lissauer and Pierre Pailler know of our intentions of ordering the parts. At our meeting of March 25th, we have in the minutes: " We agreed to purchase 3 bellows, 4 warm flanges and 4 cold flanges. Quotes should also be obtained for orders of 60 and 125 parts." We need to think about these numbers again. Should it be 4 bellows? 3 of each flanges? 55 and 130? [to focus the discussion, let's consider 3 bellows 3 cold flanges 3 warm flanges 55 and 130 for quotes ] - Plans for Prototype Construction and Tests If the flanges, bellows and funnels are ordered before the end of June, we can expect them early September. Roy to contact TRIUMF with regards to welder time for welding at UVic. It is expected that the prototype would involve one to two days of work. Paul and Roy to look into the welding equipment needed, if any. - PC's A new PC is being ordered. Alisa's PC will be repaired. We agreed that we should order one 8-serial port card and try it out. The server is up and running and actually "serving", with more PC now on our domain. Some PC's still to be put onto the domain, including Paul's. - Pigtails Michel pointed out that we may now wish to consider ordering pigtails for the prototypes. At the last LAr week it was mentioned that no pigtails (for the prototypes) would be available before Jan 99. Michel to contact Daniel Fournier on this subject. We discussed our possible request: 20 X 25ohm pigtails 20 X 50ohm pigtails 20 X 25ohm short microD-microD cables 20 X 50ohm short microD-microD cables 5 X 50ohm ATI-ATI cables, if possible We may wish to revisit these numbers, before talking to Imbert. Richard pointed out that P.M. Puzo carried detailed outgassing tests on the pigtails, and that the presence of F19 could not be excluded. Richard proposes that we should redo these tests ourselves. Richard has contacted T. Gough on the possibility of using laser techniques to measure the presence of F19. - AOB - FEA work for TIS Pierre Pailler expects Terry to prepare a summary of the FEA work on the feedthrough for the upcoming LAr week. This could then be presented to TIS for comments. - Michel pointed out that we should, in the next month, produce pictures of our equipment and parts, with a view to scan them for use on the web and in presentations. Margret agreed to look into it! - Michel to compose a memo to H. Dosso and B. Horita thanking them for their offer of lab space. Richard to contact A. Oliphant with regards to the walls of B. Horita's room. We agreed to keep the graphite and tuck it in some corner. - ATLAS Meetings and Other Important Dates - Jun 08 - Jun 12 : ATLAS week - Jul 06 - Jul 10 : LAr week - Jul 23 - Jul 29 : ICHEP98 "Rochester Conference", TRIUMF - Sep 04 - Sep 18 : ATLAS week (Overview) - Sep 21 - Sep 26 : LAr week - Nov 12 - Nov 18 : LAr week - Nov 16 - Nov 20 : ATLAS week