Alcator C-MOD Weekly Highlights July 25, 1995 The scheduled maintenance period is continuing at Alcator C-MOD. Systems reassembly in preparation for the fall operating period is well underway. The cryostat was closed and sealed last week. Pressure testing was successfully completed. Operation of the cooling valves and lines was verified with N2 gas from the vaporizer. The CRYO PLC processor has been changed to a newer, faster model. The scan time with the new model has decreased from about 180 milliseconds to about 15 milliseconds. Half of the second tier of igloo blocks have now been replaced. Vessel heater control boxes, which mount on the igloo, are being reconnected. About half of the new halo rogowski coils have now been installed. Work is proceeding on the remainder. Leak checking and fitup for the Divertor Thomson Scattering optical head were completed. The unit has been sent back to Dirk Dimock at PSI for final installation of the optical components, following which it will be returned to M.I.T. for installation inside the C-MOD vessel. The new EF4 supplies (old Alcator C supplies) were loaded on trucks and are now in transit from Livermore. They are expected at the local riggers this week. Fabrication of the new EF4 power room bus work is complete and the straight sections have been installed. New switchgear to be used for the RF systems, also transferred from LLNL, is now onsite. C-Mod has been integrated with the PPPL-based TRANSP code development system. Using network file transfers, we are now able to receive code updates on demand. We are also able to share with the global TRANSP community the locally implemented modifications integrating TRANSP with MDSplus. Analysis of C-Mod data is continuing. Amanda Hubbard spent two days at Tokamak de Varennes discussing reflectometry issues. Martin Greenwald attended the ESNET steering committee meeting in Napa. Miklos Porkolab participated in the TFTR Review at PPPL. Bob Granetz attended a one-day workshop on TPX diagnostics at Princeton.