Alcator C-Mod Weekly Highlights October 22th, 2007 FY2008 weeks of research operations: Target: TBD Completed: 0 weeks Operations ---------- The alternator seal oil cooling heat exchanger bonnets that were out for refurbishment have been returned and are being reinstalled. Sections of the TF bus have been removed and are being re-plated. Upgrades of PARAGON PLC software to RSVIEW is proceeding on engineering and diagnostic systems. In-vessel Work -------------- We continued to re-install outer divertor components removed during the flux loop installation. New outer divertor edge tiles fabricated to replace tiles sent out for analysis are ready for installation. All but two outer divertor current shunts have been installed. We continued work on the new lens holders for the MSE optics and the polarimeter shutter. The re-entrant flange for the new periscope at the K-Port horizontal flange has been installed, as have the new crystalline quartz windows for the polarimeter. A new improved lens holder for the z-meter array has been completed. Approximately 80 new, horizontal, off-midplane bolometry views have been installed and calibrated for the 2D bolometry system. An array that was damaged soon after installation in FY07 was repaired, adding another 20 views. Data from these new views will be used to investigate in/out and up/down asymmetries in the radiation. New guide tubes for the CXRS toroidal optics shutter control wires have been fabricated. A template will be formed in-vessel and the new tubes will be formed to the template. The shutter has been reassembled. Lower Hybrid System ------------------- Following inspection and cleanup of the transformers and rear and forward waveguide stacks, re-assembly began of the jungle gym early last week. Eight of the twelve sub-assemblies were installed by Friday, and the remaining four over the weekend. We continue to work with our vendor on rebuilds of several klystrons. Two more klystrons arrived at the vendor last week for evaluation. A CST simulation of the new 16 guide lower hybrid coupler using a cold plasma approximation showed good coupling to the plasma with coupling between guides varying from -4 to -10 db. A network simulation is being developed to determine how this guide-to-guide coupling will affect the coupler phasing. ICRF Systems ------------ We continued installation and calibration of new demodulators. FMIT transmitters #2, #3, and #4 have been tuned and tested into dummy loads in preparation for the next run campaign. An issue with the FMIT #1 high voltage turn on cycle will delay tuning of this system until later this week. Travel and Visits ----------------- Paul Bonoli and John Wright attended a Workshop held by the SWIM Prototype FSP Project at Oak Ridge National Laboratory from October 15-17, 2007. Paul Bonoli gave a talk titled "Fast MHD Physics Accomplishments and Targets: Current Ramp-Up and ICRF Heating in Alcator C-Mod". John Wright gave a talk on implementation of "The TORIC RF Component in the Integrated Plasma Simulator". John Wright attended the US-Japan Simulation Science Workshop and the International Conference on Numerical Simulations in Plasmas in Austin, TX the week of Oct 8-12th. Joshua Stillerman attended the 'International Conference on Accelerator and Large Experimental Physics Control Systems' (ICALEPCS) in Knoxville, TN last week. He co-authored two papers: "MDSplus Real-Time Data Access in RTAI" and "Remote Operation of Large-Scale Fusion Experiments". Stan Kaye, PPPL, visited MIT on Friday and gave the PSFC seminar on an "Overview of Recent NSTX Research Results". He had discussions with Martin Greenwald, Steve Wolfe, Steve Scott, and Miklos Porkolab on potential expanded collaborations on NSTX. _______________________________________________ Cmod_weekly mailing list Cmod_weekly@lists.psfc.mit.edu http://lists.psfc.mit.edu/mailman/listinfo/cmod_weekly