Minutes of feedthrough meeting of 8 August, 2000. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Present: GV, Pof, MLenc, AD, RL *) Milestones: - 46 Vacuum Cables arrived on 1 August. None of the cables have serial number labels attached, and consequently cannot be tested. Bob Evans of FCI has been notified that electrical tests cannot start until serial number labels have been received. - All warm flanges have now been drilled and tapped to accept the flange heater. - FT0 was installed into the cold test station, and the pigtails fitted with jumpers. No tests have been done yet. - During show-and-tell, Mark showed some nylon straps with buckles to tie down the feedthroughs in the shipping crates. Pof suggested using some high density foam on the wood cradles of the shipping crates to add some elasticity as the feedthrough is tensioned onto the cradles with the nylon straps. - The 27 vacuum cables that arrived on 28 July have been tested and analyzed. Two cables were failed, one due to a bent springclip and the other due to a handwritten serial number label that duplicates a serial number from a previous batch. The latter cable will be tested once FCI has provided us with some of their unused serial number labels. Of the remaining 25 vacuum cables: Impedance ranged from 29 -> 37 ohm Resistance ranged from 0.846 -> 1.057 ohm 1 calibration pair identified Contact Resistance ranged from 0.015 -> 0.021 ohm 3 cables with 1 open 1 cable with 2 opens Cross Talk ranged from 0.112 -> 0.380% All of these electrical test results are acceptable, and therefore these 25 cables are PASSED. *) Greg and Aaron will take to TRIUMF 20 warm flanges, 20 cold flanges, and 12 bellows for ultrsonic cleaning on Wednesday and Thursday (August 9,10). *) Cold tests for FT0 are still scheduled for next week. The 200 litre LN2 dewar will be picked up this Friday to be filled. *) Mark and Terry will keep in contact with BNL regarding the electrical connections for the temperature sensors and heater wiring, and will respond to Pierre Pailler regarding his request for a presentation at the September LARG week. *) Aboud confirmed to Roy that the four tapped holes on the warm flange are required for manouvering the feedthrough during installation. Consequently, the heater plates will have to be attached afterwards. Mark has pictures of the BNL heater, showing that they too cover the four tapped holes. Agenda for next week: ^^^^^^^^^^^^^^^^^^^^^ - Milestones - Heater news - do we need to change our resistors from 50 Ohm? - UltraSonic cleaning report - Cold Test plans - AOB