Alcator C-Mod Weekly Highlights November 21, 2001 Inspection of the machine components continued this week while work on the LH MIE Project, ICRF systems, and the inner divertor moved forward. Diagnostics associated with the inner divertor were prepared for installation. Inspection ---------- Refurbishment of the TF voltage tap and thermocouple leads will be complete this week, after which the TF arms and legs will undergo a clean up, inspection, and hi-pot in preparation for machine reassembly. During the last run campaign some preload was lost on several of the bolts securing the OH coaxes. We continue to make measurements and run analysis to better understand why the preload changed. We expect to finish up this process and determine if any modifications to the coax are required over the next few days. Lower Hybrid MIE Project ------------------------ We continue to bring up and test the transmitter protection and control system. The first cabinet has been integrated into our test setup and power has been applied. Testing of the PLC control system for the klystron carts has begun. The pump controller for the cooling system is being installed. The Kirk lock electrical and mechanical interlocks for the LH system are being designed and interfaced with those supplied with the HVPS. The new mezzanine is up in the cell and the water cooling manifold together with the required instrumentation is nearly complete. ICRF Systems ------------ The local oscillator needed to drive the new phase demodulators has been prototyped and is undergoing testing. A programmable phase locked loop is used that can easily cover the required 40 to 80 MHz range. Layout of the demodulator board continues as does development of simulations for the antennas, transmission lines, and input/output cavities. DNB and Related Diagnostics --------------------------- The final design review for the DNB flange (F-Horizontal) was held on Monday. All major issues have been resolved. A new tangentially viewing flange will be added for rotation measurements. Changes will be made to improve the ECE radiometer system and to allow a new wide angle TV view of the plasma and vessel components. Most old DNB components have been removed from the cell. Detailed plans are being developed for installation of the RFX beam. Inner Divertor -------------- Several amps of current at 60 Hz were driven in the EF1 lower magnet this week so that tests could be made of the flux loops that pass under the new inner divertor components. All the loops are functioning properly. Calibrations of the new halo Rogowski coils were also completed successfully this week. The Rogowski coils are now ready to be mounted, along with the divertor rear girdle plate, on the inner wall. Installation of these components will begin next week. Data Infrastructure Upgrade --------------------------- Three unix workstations have been installed in the C-mod control room. These machines are prototype client workstations for the planned migration from OpenVMS to unix. Users have begun porting their applications, and we plan to move a significant portion of our intershot computing to these platforms before the start of the next campaign.