Alcator C-MOD Weekly Highlights
			Oct 15, 1996



	We continue to disassemble and inspect the machine.  All
upper TF arms have been removed and inspected.  Resistance measurements
of both the inner and outer OH2U coax have been made and comparison
measurements made of the OH1 and OH2L inner coax.  Nothing unusual has
been seen or measured thus far.  Some marking of the central column by the
upper TF arms indicates more contact occurred in these locations than
expected, and we may have to increase the clearances somewhat.
	Work on our power systems continues.  The EF4 supply suffered
fuse and SCR loses during the last campaign when used to drive the EF4
coils in parallel to obtain higher voltages and faster control response.
This new configuration is being analyzed in detail, and new reactors
for the supply will be specified.  In addition, time was lost debugging
power systems during the last run period because of inadequate fast
diagnostics of gate, trigger, and fault signals.  We are now in the process
of adding approximately 80 new CAMAC channels to monitor these signals.
	Pablo Acedo from Carlos III University has returned for two weeks
to work on the new tangential interferometer.  Bench tests of this new system
are now realizing approximately 1/100 fringe resolution at 1.062 um.
An optical wedge and flat were required at the output of the laser to
correct for angular deviation and displacement of the IR beam relative to
the visible one.
	Norton Bretz and Forrest Jobes from PPPL, and Dirck Dimock from
Princeton Scientific Instruments (PSI), visited last week to discuss
tangential interferometry on C-Mod, possibly including high spatial
resolution measurements of the plasma edge.
	Joe Bartolick (PPPL) returned last week to continue tests
on the edge Thomson scattering system.  As mentioned last week, the optical
head is now outside the vessel, but still attached to the polychromator
via the fiber array.
        One of our collaborators, Dr. Kevin Fournier from LLNL, and
a visitor, Dr. Nobuaki Noda from LHD in Japan, met with C-Mod spectroscopists
John Rice, Jim Terry, and Rudi Neu (ASDEX).  Under discussion was the
experimental and theoretical status of the atomic physics of high Z elements.
C-Mod, ASDEX-Upgrade, and LHD are all interested in the use of high Z plasma
facing components.
	A large fraction of our scientific staff attended the IAEA
meeting last week in Montreal.  Attending were Paul Bonoli, Bob Granetz,
Martin Greenwald, Amanda Hubbard, Ian Hutchinson, Bruce Lipschultz,
Brian LaBombard, Earl Marmar, Miklos Porkolab, Joe Snipes, Yuichi Takase,
and Steve Wolfe.  Oral and poster presentations covered a wide range of
C-Mod experimental results and some theory.

Oral presentations:

Hutchinson, I.H., et al., ``High-Field Compact Divertor
Tokamak Research on Alcator C-Mod.''

Lipschultz, B., et al., ``Variation of the Divertor Geometry in
Alcator C-Mod.''

Takase, Y., et al., ``High Power Density H-Modes in Alcator C-Mod.''

Posters:

Bonoli, P.T., et al., ``ICRF Heating Scenarios in Alcator C-Mod.''

Garnier, D., et al., ``Formation and Evolution of Internal Transport
Barriers in Alcator C-Mod.'' 

Granetz, R.S., et al., ``Disruptions, Halo Currents, and Killer
Pellets in Alcator C-Mod.''

Hubbard, A., ``Local Plasma Parameters and H-Mode Threshold in
Alcator C-Mod.''

LaBombard, B., et al., ``Transport Studies in the Scrape-off Layer
and Divertor of Alcator C-Mod.''

McCracken, G.M., et al., ``Impurity Screening Studies in the
Alcator C-Mod Tokamak.''