Chamber mechanics Chamber mechanics Production in China Peking University Group – 20 Aug. 2008

Chamber mechanics: honeycomb box: made of Al top and bottom 6 mm thick honeycomb plates and edge bars. The honeycomb plate is composed of 0.5 mm thick top and bottom Al covers sheets, and 5 mm thick Al honeycomb core; at edges and few other positions (where slots or threaded holes will be located) 5 mm thick solid Al plates will be inserted. The cross section of the edge bar is 16 x 16 mm 2. auxiliary parts: include the front patch panel, the joint pieces for mounting the chamber in the yoke, the inside chamber fixation pieces etc. cooling circuit, FEB support and screen box: made of copper pipe soldered onto three copper plates, where the FEB will be mounted. The screen box made of 1 mm thick Al sheets will cover all cooling and FEB system. readout strips plane

honeycomb box production Production site: “Beijing Axicomb Technology co., Ltd” (China) Production procedure: the 0.5 mm thick Al sheets are cut to shape and the surfaces are oxidized; additional 5 mm thick Al plates and the Al honeycomb cores are glued at the edges and in the middle; the assembled plates are heated at 120º temperature to cure the glue; finally the slots and holes are machined. a CNC machine will make all parts inter-changeable. auxiliary parts, cooling circuit, FEB support and screen box will be produced in the same site. Layout of a typical honeycomb plate

readout strips production: Production site: “Beijing Gaonengkedi SGT co., Ltd” (China). Production procedure: The plane is 0.3 mm thick, with a mm thick copper cladding. Strips are produced by etching method. By request, the factory could heat-cover the strips plane with a 0.15 mm thick Mylar sheets for protection and insulation. Layout of a typical readout strip plane

Time and budget “Beijing Axicomb Technology co., Ltd” and “Beijing Gaonengkedi SGT co., Ltd” have already successfully provided good quality mechanics for the RE station built and installed in CMS. The engineers of the companies have viewed the RE2 mechanical drawings and see no technical problem. They promise to provide even better quality products due to the progress of facility and technique. For the 144 double RE2 chambers, the companies could completed the production of the mechanics within three months after signing the contract. Considering the time needed for the transportation, ordering the mechanics six months before the chamber assembly is recommended. The Chinese funding agency will contribute 0.5 M CHF on RPC completion project (on high eta section in our proposal). Half of the budget was arrived in Peking University in July Part of the budget could be used on low eta project if the project management sees the necessity according to the overall funding plan.