Alcator C-MOD  
			Weekly Highlight Report 
			August 12, 1993

Alcator C-MOD is continuing the second block of runs in our Phase I
Experimental program. Plasma control development and edge and scrape-off layer
studies are the primary experiments for this week's runs. 

Following dedicated runs on Thursday and Friday of last week, the RF group is
continuing low power coupling studies in a piggyback mode. Typical power levels 
for these studies are of order 1kW.

Following a discharge development run aimed at x-point location control on
Tuesday, Wednesday's run was devoted to scrape-off layer characterization
studies in diverted discharges using the fast-scanning probe and the probe
arrays mounted in the lower divertor plates. Typical parameters were
elongation of 1.5 to 1.6 and plasma current of 550kA. Discharge durations were
extended to over 0.75 seconds. 

Today's run is dedicated to investigating the scaling of edge density with
core density. For this purpose the plasma is being run in contact with the
outboard RF protection limiter, so as to include data from the limiter probes.
The antenna is positioned 2cm behind the limiter and RF coupling data is also
being collected on every shot.