Alcator C-Mod Weekly Highlights October 26, 2001 The disassembly of the machine was completed this week with the removal of the OH2 lower coax. Inspections of the TF components and coaxes continues. Work also continued on the Lower Hybrid Project, the inner divertor, and the DNB. Physics ------- We are very happy to announce that Amanda Hubbard has agreed to lead our new Advanced Tokamak Task Force. Its purpose will be to identify and detail projected Alcator C-Mod AT operational scenarios, and ensure that preparations are made to address them experimentally. Preparations for APS/DPP continued this week. Inspection ---------- The disassembly of Alcator C-Mod is complete. The lower OH2 coax has been removed and inspection of this critical component has begun. As found on the upper coax connections, some relaxation in the torque of one of the outer coax bolts was discovered. We continue to analyze this problem with both simulations of the coax and bench measurements of the components. A careful inspection of the TF components continues. Inner Divertor -------------- Welding of studs on the inner wall began this week, and fitups of the divertor plates to the studs indicated very good positioning of the studs. A nice picture of the fitup may be seen at http://www.psfc.mit.edu/cmod/operations/EngImages/Inspection_2001-2002/Disassembly_Assembly/part4/P0002308.JPG Lower Hybrid MIE Project ------------------------ Progress continues on the HVPS installation. Wiring of the lights and receptacles is nearly complete. Wiring is ongoing between the HV transformers in the lower container and the power modules in the upper container. The HV triax cable is being run. Wiring of the HV Junction Box is proceeding. Wiring between the lower distribution box and the components in the upper junction box is taking place. Wiring of the transmitter control and protection cabinets is ongoing. Currently, two cabinets are being wired. The third is partially complete and is being used to test the control and protection circuits. Once wiring is completed on the first cabinet, it will be used for testing so that wiring of the third cabinet can be completed. Design of the pump controller box was completed this week. The printed circuit board and other parts to assemble the box was ordered. Mechanical design of the water system flexible hoses is currently underway. Once the hose lengths are determined, a drawing will be generated and sent out for bids. The flexible hoses will be necessary to completely test the water system under pressure. The commissioning start date of the HVPS has been changed from October 30th to January 8th 2002. Problems discovered in a similar supply being commissioned at Wendelstein W7-X indicate retrofits to our supply will be required (at the vendor's expense). These changes should not affect our overall LH schedule. DNB and Related Diagnostics --------------------------- The current DNB will be removed from the cell and replaced with a beam with a much higher main energy component. Removal of the beam began with identification of equipment that can be recycled into the new system. Arrangements for staging the present components prior to crating, shipping, and storage were started. All power sources for the beam were locked out so that disassembly could begin. Written procedures have been partially completed for removal of sheet metal duct, filament power, HV coax arc notcher, suppressor, and dump switch as this activity must be conducted so that it does not interfere with other C-Mod work. The design for the new CXRS system is moving forward. The arrangement of fibers in the entrance plane and the design for the curved slits is underway. In preparation for the F-port flange review, a set of drawings was assembled for distribution at the end of this week. A conceptual drawing for the mods to the ECE mirror was completed for distribution. C-Mod Quarterly Review ---------------------- A Quarterly Review was held on October 24th via video conference with participants at DoE, MIT, UTexas, and PPPL. After introductory remarks by Earl Marmar, the C-Mod facilities, Lower Hybrid Project, and the status of the DNB and related diagnostics were discussed in talks by Jim Irby, Montgomery Grimes, and Bob Granetz. Attending were DoE: Rostom Dagazian, Chuck Finfgeld, Warren Marton, Earl Oktay, T.V. George The University of Texas: Bill Rowan, Don Patterson PPPL: Gerd Schilling, Joel Hosea, Stefano Bernabei, Remi Dumont, Greg Pitonak (DoE), Gerrit Kramer, Skip Schoen, Randy Wilson, MIT: Ian hutchinson, James Irby, Earl Marmar, Miklos Porkolab, Ron Parker, Paul Woskov, Amanda Hubbard, Montgomery Grimes, Bob Granetz, Howard Yuh, Chris Boswell