Minutes of feedthrough meeting of 22 July, 2002. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Present: Pof, PB, WW, AD *) Milestones: - Cross talk tests for ft50 (the last HEC) have been complted; the final resistance tests remain to be done. - ft51 was cold tested, and final electrical tests were also completed. - All shipping crates (coffins) except for the FCAL have been completed by DAVE. - Three HEC ft's have been crated; HEC ft50 will be crated once the final resistance tests are done. - All thermal pads for the ambient flange heaters have been cut. - 30 T52 (FCAL) pigtails arrived from Axon on 18 July. We now have all the T52 pigtails, but must wait for the completion of the LAr contamination tests before the FCAL feedthrough can be built. There still remains 41 pigtails to be delivered, which is holding up the building of the final two Standard feedthroughs. *) The endcap cryostat ECC is presently sitting in B180 with the beam axis oriented vertically. Aboud has proposed that the cryostat remain in this orientation for the installation of the feedthroughs, since the installation is much simpler this way. There is presently scaffolding built around the cryostat so that access to each feedthrough port is simple and without risk of falling. Pof expressed a desire during the 15 July B180 meeting that the cryostat be left in this orientation also for the pedestal and warm cable installation. *) Report from Fiona at CERN (22 July): In regards to Roy's wheel, do you remember the lump in the floor, well the floor people showed up on Friday morning to deal with the lump. Half the HEC modules are off the wheel with around 4 being fixed, so far. 12 in total have damaged wires but Roy and Jurgen are already putting other modules in their place BUT are not connecting them until the HV test is done on each one. Longer process but it will be correct. Last week, on Thursday the first test plug was welded twice but neither welds were good so that is in a holding pattern. In between helping out Aboud or Jacques I check in with Roy, watch Dave work (I have successfully driven the manlift into position close to the Barrel Cryostat, with Dave's help) and I am also doing a tutorial for Labview. This morning Dave and Victor (I watched and offered comments) figured out a way to hold the warm cable spacers in place for when the pedistal is at a strange angle. They have figured out that by slightly squeezing the spacer (with a pair of pliers) just before you install them, they should not drop to the floor. Dave will be putting that theory into practice by installing warm cables this afternoon. The first transition plug for FT install was being cut this morning by Jaques. In this afternoon B180 meeting it came out that Pierre is in Orsay today watching the stopper test. It looks like the proposal is going to be accepted that the stoppers are just stuck in place and the warm and cold vessels sealed, to hold them in place. Aboud has said that it will not be easy to stick these stoppers in place and that a couple might not work. Patrick said the proposal has to include proof, by some means, that the stoppers will not move, this could involve X-raying the End Cap cryostat. Patrick said he will not accept the proposal until that happens but Aboud assured him that would be done. So it looks like they are going to accept Guy's proposal. Lief put in his objection that it sounds like the stoppers being stuck in place will not work but Patrick said that Guy's proposal has to go through and that there would be no more discussions. So if the Orsay tests work - the stoppers will be glued in place. Aboud said that Jacques would proceed with cutting all of the cyrostat plugs, as prep work for the FT's. Outside of the meeting, Dave thinks we should leave one spare for each type of FT, just in case the FT cut doesn't match the plug. I will mention this to Aboud but so far the learning curve is steep and it looks like that will continue. So, Paul, I don't know about the ECC proposal but Leif, Thomas and several others still object yet Patrick has to go with it. How much work we will get done in the next two weeks is unknown - everyday it's a new problem here so I will probably work with Roy and Dave tomorrow because Aboud will be sorting out problems. *) Report from Fiona at CERN (23 July): I spoke with Aboud just after lunch, we experiment with the FT install tomorrow morning. I will take pics. We are not going to cut the FT's in the caged area but closer to the cryostat, an area has been cleaned just the other side of the cage. Men are currently drilling holes into the floor for that large FT holder mock up and Jaques is cutting the plugs for 10 FT's. They are just going to cut that many to see how things go. Pierre just came in and he is not pleased with Guy's experiment - lots more to sort out - but we are going ahead with Aboud's trial. Roy's HEC wires were damaged when the connecting bars were put on. Some modules had wires covering the area where the bars attach to the module. While installing the bars you can't see that wire because it protected by a covering but when the bars go on the wires get moved and then crushed. Roy's new problem this morning is that they are using spare modules but they discovered that the modules's moving support is 3.5mm to large so it does not fit on the wheel with the rest of the modules. They pulled another module out (both turn out to be Russian built) and the same problem. So Roy had to take the module off the Russian support and use a support from another module. Roy is not impressed because he said the Russians knew about this problem 5 years ago and apparently they never fixed the problem. Sergei is currently working with Roy and was there when the module was put on the wheel so he saw the problem. So Sergei is going to take the 2 Russian supports and "fix them" so that they can be used in the future. I agree that for the ECC we will not have the same problem with the spacers - I hope. You do know how easy it is to drop those things, correct? (This is provided that ECC remain oriented with the axis vertical for the installation of the warm cables. - pof) Agenda for next week ^^^^^^^^^^^^^^^^^^^^ - Milestones - Plans for the week - AOB