Alcator C-MOD Weekly Highlights July 14, 1994 The maintenance/repair period is continuing, with the primary activity being a partial disassembly of the machine to repair the OH2L coaxial buss. Rapid progress is being made in the disassembly. On Saturday the cylinder was removed, and relocated to the northeast corner of the cell. By Wednesday morning all of the vertical and top radial TF arms had been removed. Inspection of the felt-metal sliding joint surfaces during the disassembly showed these to be in very good condition. The upper wedge plate was also removed on Wednesday. Some of the upper mounting plates were temporarily removed to provide access to the OH1 and OH2U coaxial busses. These busses are identical in design to the OH2L buss. On removal, the OH1 coax buss was found to be in perfect condition. The OH2U buss, on the other hand, showed definite indications of a developing problem. This additional evidence will help in diagnosing the cause of the problem on the lower (OH2L) coax. The assembly stand has been placed in position in the southeast corner of the cell. The machine will be transferred to the assembly stand for removal of the lower arms and wedge plate, providing access to the damaged OH2L coax buss. Martin Greenwald is attending a meeting of the Fusion Computing Council in Washington this week. On Monday and Tuesday, Steve Fairfax participated in a meeting of the CPEP Fusion Committee at PPPL. On July 11 and 12, J. Terry, J. Rice, and M. Graf traveled to The Johns Hopkins Univ. for meetings with the plasma diagnostics group at Hopkins (Michael Finkenthal, Moshe Cohen, and Mark May) and the atomic theory group from LLNL (Bill Goldstein and Kevin Fournier). The discussions concerned the present state of atomic physics modeling of the medium and high ionization states of molybdenum. Experimental data (x-ray and VUV spectra) from C-Mod were presented. These results will be used for comparison with the sophisticated atomic physics modeling being carried out by the Hopkins and LLNL groups.