Alcator C-MOD   
			    Weekly Highlight Report  
				August 31, 1993


Alcator C-MOD is now in the second week of a planned three-week maintenance
period. 

After the structure had warmed up to room temperature, the bus tunnel and sump
lines were opened to perform cryo-system maintenance. Several repairs and
improvements have been made to reduce LN2 leaks and ice formation. The gas
purge system has been upgraded to increase the flow. The dewar and bus tunnel
have now been closed up and the gaseous N2 purge is on. 

The power systems group has modified the regulator circuitry in the
circulating current power supplies in preparation for four quadrant operation.
The problems identified during last week's tests have been fixed. We are
awaiting delivery of the reactors to be installed in the crowbar bus. 

A modification to the HEAT PLC/Paragon software has been made to prevent the
heater system from shutting down due to intermittant spurious over-temperature 
readings on single thermocouples. 

The RF group has located and fixed a problem that caused arcing in the
transmitter cavity at high voltages.  This will provide substantial margin
when operating at a maximum power level of 2 MW.

Dr. Scott Haney of LLNL is visiting as part of a collaboration dealing with
vertical stability issues. He is working with G. Tinios of our group to
compare results of the TEQ code with our code results and with C-MOD data. 

Steve Fairfax participated in the review of the HSX stellarator project at
U. of Wisconsin in Madison.