Alcator C-MOD Weekly Highlights
				June 2, 1994

The Phase II Operating Campaign is continuing. The main emphasis this week 
has been on bringing up the ICRF power. These discharges have also provided
interesting data in a relatively unexplored configuration. 

The D-port dipole ICRF antenna is being conditioned. Up to 1.8MW has now been
coupled to the plasma through the one antenna. The target discharges for the
conditioning are inner wall limited, deuterium majority plasmas with
elongations around 1.5, and plasma currents of 800kA; the toroidal field is
set to the hydrogen minority resonance at 5.3Tesla. Substantial electron and
ion heating have been observed during the ICRF conditioning activities. Very
preliminary analysis indicates that the energy confinement is not inconsistent
with L-mode scaling and good heating efficiency. 

These shots were also used by many of the spectroscopic diagnostics to do
spatial scans of a number of Molybdenum charge states.   A scan of Mo influx
vs RF power for the new dipole antenna was accomplished. Although the Mo
influx increases with RF power, the Moly Monitor shows a significantly smaller
increase in influx when compared with single strap antenna used in 1993.

Impurity transport experiments were also carried out using the laser blow-off
technique, both in ohmic and RF discharges. Scans of plasma current and
impurity species were accomplished. 
 
ICRF-induced H-modes have been observed during these discharges, at ICRF powers
as low as 0.8MW. These limiter H-modes at 5.3Tesla are ELMy, and exhibit
significant density increases and improvement in particle confinement, but
only small increases in energy confinement. They are typically transient, as
the change in RF loading trips out the ICRF and the plasma subsequently
transitions back to L-mode. The equilibria are inside limited, but have an
x-point not far from the plasma boundary; Outer gaps are in the range of 1 to
3 cm. 

The charged fusion product detector observed its first confirmed signals,
detecting a clear peak corresponding to the 3MeV proton product of the DD
reactions during ICRF conditioning. 

The Data Acquisition Group reports that C-MOD has passed the 50 Gbyte plateau
in compressed, archived data. Data is currently being acquired at a rate of
40Mbytes/shot (uncompressed). All data continues to be available on-line from
our optical jukebox storage. The capacity of this system is projected to be
adequate through the end of the current operating campaign.

Miklos Porkolab is participating in a TPX Workshop at Livermore this week.
Bruce Lipschultz,  Brian Labombard, and Garry McCracken have returned from the
PSI conference in Japan, where they presented a total of six papers on C-MOD
results. 

Shigeru Sudo is visiting from the NIFS in Nagoya for most of the month
of June.  He will be participating in studies of hydrogen and lithium
pellet injection.  He will also present recent work on pellet injection
from the NIFS and describe plans for the LHD.