M1 Central Part Cable Routing R3 FAR R2 CLOSE R2 FAR + GEM A3 B From chain GEM R2 CLOSE R2 FAR A1 20 A1 A1 A2 A CHAIN Access Front Dané - Muon Meeting – Dec 18th 2008

18A1 18 A3 Last week 3 chambers were installed by me, Gianni B., Fabrizio, Marco and Alessandro C. on row 18 of Access Front: 18A1 (gem), 18A2 (gem), 18A3 (R2). Three main difficulties: 1.Positioning and cable connection of the gem 18A1: the space between RICH and M1 is tight.; 2.Connection of the gem 18A2: this gem has the connectors in front of the wall; 3.The final part of the gem cables are not flexible due to the presence of the plastic tube covering the labels. RICH 2 18A2 connectors Dané - Muon Meeting – Dec 18th 2008

Things to do for the central part cabling and installation chambers Arrange cables and install chambers should be done at the same time: The wall should be in open position for at least 7-8 working days per quadrant for 2 people (installation + cabling); GEM gas pipes, on chamber, are actually too long; Table of the chamber position (X and Y): reference on the Al bar; A tool for the installation of the GEM 18A1 (not easy to reach): Marco Pistilli is working on this; Upper and bottom balconies installed; The cables of the GEM must be more flexible, it means that the transparent tube to protect the labels should be removed and shifted back; Other tasks: 8 HV cables (connecting the R2 chambers) have the piece of cable between the two connectors, too short; Install the LV GEM cables. Dané - Muon Meeting – Dec 18th 2008