Alcator C-Mod Weekly Highlights March 1, 2002 We continued invessel work on the new inner divertor this week. Machining of the cylinder continued. Work on the new DNB installation and Lower Hybrid MIE Project showed good progress. Operations ---------- Two of the three port modifications to the retaining cylinder have been completed. These changes will allow better tangential access to the plasma. The OH2U and OH1 coaxes were installed this week. Resistance, hi-pot, and ring tests were all to specification. Following first-to-last turn hi-pots early next week, we will begin installation of the wedge plate and remaining TF horizontal arms and vertical legs. Lower Hybrid MIE Project ------------------------ The last equipment rack has been installed in the Cell (control & protection cabinet for transmitter #1). Wiring of transmitter #3 is nearly complete, and we have begun wiring transmitter #2. We have also begun populating the regulator and filter board for the input RF switch and solid-state preamp. We have begun work on the output waveguide assembly. Testing of the prototype Lower Hybrid waveguide has started at PPPL. PPPL is requesting a Fin Plan change to allow a more timely procurement of remaining long-lead-time components this fiscal year. The PPPL LH engineering group is preparing the background and paperwork for these procurements. ICRF Systems ------------ We have checked crowbars and protection circuits, tuned, and brought up both transmitter #3 and #4 to approximately 1.8 MW into a dummy load. We are now working to bring up #1 and #2. This work is in preparation for the Spring run campaign. We continued to procure the parts needed for approximately 50 new demodulator boards. Inner Divertor -------------- All inner divertor tiles have been installed and we are in the process of doing final torque checks. Spot welding of the tile keeper hardware, scheduled to be done next week, will complete installation of the inner divertor. DNB and Related Diagnostics --------------------------- A great deal of progress was made on the new DNB installation this week with an enormous amount of work provided by nine engineers from the Budker Institute. The vacuum chamber was assembled and leak checked successfully. The chamber was then moved onto its supports on the cell diagnostics stand. A picture of the vacuum chamber installation in the C-Mod Cell can be found at http://www.psfc.mit.edu/cmod/operations/EngImages/Inspection_2001-2002/Disassembly_Assembly/Machine_assembly_A/DCP_0230.JPG Four power electronics racks were installed in the cell at floor level, and three more racks are ready to be installed. The transformer tank is leak tested and filled with SF6. Ron Bravenec, U Texas, was at C-Mod to set up the CAMAC crate for the DNB (with guidance from Don Patterson at Texas). It will be tested once it can be hooked up to a data highway. He also consulted with Rui Vieira and Dexter Beals about the schedule of the F-Port flange (currently being welded and expected to be finished next week), and prepared a schedule for UT-FRC's diagnostics work and installations at F-Port. He also discussed hardware issues with Howard Yuh and Russ Feder (of PPPL) concerning the MSE/BES optics system. Travel and Visits ----------------- Miklos Porkolab attended the FESAC meeting on Feb. 27,28. Dmitri Mossessian was at GA for the ITPA Pedestal meeting last week. Bruce Lipschultz was also at GA, for an edge/divertor ITPA meeting.