Alcator C-Mod Weekly Highlights September 28, 1998 Engineering: Reassembly of Alcator C-Mod continues. Preliminary alignment of the core and OH stack together with installation of the OH support blocks consumed most of the week. Repair of a cooling shroud which had been torn during the plating activity delayed assembly somewhat. However, all PF coils are now installed. All TF lower arm soldering has been completed as has installation of the lower arm curved layups. We have begun the electrical checkout of the arms which will conclude with a hi-pot between all turn-to-turn plates. The upper TF arms also have peel test locations that are being resoldered. It should be noted that all test locations showed very good solder bonds that give us a great deal of confidence in the inductive soldering technique. We continued the development of the DNB and the DNB diagnostics for C-Mod. The F-port flange machining, welding, and leak testing was completed at UT-FRC. The flange will be shipped to MIT this week for an interim inspection prior to final grinding of the vacuum side. The vacuum oil dryer system was operated and oil samples taken to benchmark its operation. Norton Bretz, PPPL, visited to discuss final layout of in-vessel components for MSE. Work continued on the control system for the accelerator supply. We completed modifications of the F-port igloo blocks to allow better diagnostic access. FMIT#3 and #4's remote control system checkout is nearing completion. FMIT#3's analog I/O test is complete while work continues on FMIT#4. Gerd Schilling and Randy Wilson have continued to work on the decoupler design for the J-port antenna. A design has been found for 78 MHz and 60 MHz which will allow (0,pi/2,pi,3/2pi) antenna phasing. Approximately half of the antenna faraday rods have come back from the being plated and were sent out to be TiC coated. The port cover was finished to 16 rms and the coax extensions have been sent to be plated. Vacuum modifications to the H-port extension-extension, for the relocated ECDC horn, and for a grazing incidence scanning mirror, have been completed. The modifications consisted of the machining for, and installation of 3 new ports onto the extension-extension. They have been welded and leak-checked, and the extension-extension is ready for reassembly of the vacuum pumping stations. Machining of the new K-port flange is also well underway. Travel and Visits: Amanda Hubbard, Miklos Porkolab, Spencer Pitcher and Joe Snipes attended the DIII-D Brainstorming meeting at GA, presenting a total of 9 ideas for the 1999 DIII-D experimental campaign. Spencer Pitcher also attended the NSTX PAC meeting at PPPL.