Alcator C-MOD Weekly Highlights
				August 31, 1994

The repair/maintenance period for Alcator C-Mod is continuing. Most of the
activity this week has been concentrated on production of the new OH coax
busses. 

The outer coax tubes have been received from the vendor and mate extremely
well with the coax flanges. The bending fixture has been modified to
accommodate the new design; a model coax is ready for test bending. All of the
silver-plated felt-metal contact pad material is now in-house. The EDM vendor
has completed the second inner coax assembly, and this delivery of this piece
is expected today. 

The OH core is being cleaned by flushing the LN2 jacket region with Freon. The
final machining and finishing of the OH2L terminal block has been completed,
and the coils hi-potted (rung) to 5kV. The only remaining procedure prior to
re-installation of the core into the machine is machining of a relief into a
G-10 block at the top of the OH1 coil to accommodate a position sensor, which
is part of the additional instrumentation being installed as recommended by
our engineering review. 

DEGAS modeling of the C-Mod plasma is continuing in collaboration with Stotler
at PPPL.  EFIT equilibria and plasma temperature and density profiles for
specific 1994 discharges have been used to produce a DEGAS grid. Halpha
emission profiles have been calculated and compared with experimental data for
both inner wall and divertor regions. Assuming constant temperature and
density along a field line satisfactory agreement is obtained from the inner
wall profile, but  the divertor data is still unsatisfactory both in shape and
absolute magnitude.  The problem is related to obtaining good interpolation of
density and temperature profiles along field lines between the measured
upstream and target values.  An improved algorithm of the observed gradients
of temperature and density along a field line is being developed.