Alcator C-MOD Weekly Highlights
				March 24, 1994

Progress continues toward bringing the vacuum break to a conclusion by the end
of this month. 

All major in-vessel work has been completed. Flanges are now being installed
where possible, calibrations are being finished up, and in-vessel cabling is
being checked out.  For the first time in many weeks there are no in-vessel
components such as tiles, current shunts, or cables awaiting vacuum baking.

A-port horizontal was leak checked successfully this week and its boot
installed.  Completion of this job allowed several more igloo blocks to be
installed.  These blocks were particularly important since they provide
support for the torus gas feed system, and numerous thermocouple, heater, and
TF scanner interface boxes.

Installation of both dipole ICRF antennas is now complete. In addition, the
stub tuners/phase shifters have been installed in the cell. Owing to a
reporting error, the coating of the D-port antenna Faraday shield was
mis-identified in last week's report; the D-port Faraday shield is TiC-coated,
while the E-port antenna has the B4C-coated Faraday screen. 

Diagnostic installation and debugging continued this week. All new Rogowski
coils have now been installed and their associated cables run.  The
calibration of the visible light reticon arrays was completed.  All outer
divertor current shunts (ten toroidal locations) have now been installed, and
their coax cables checked out. Debugging of the first wall thermocouples is
nearly complete.  The divertor scanning probe was installed, operated, and its
position calibrated.  The outer divertor cover plates, which protect much of
the divertor instrumentation cabling, have been installed.  The last divertor
bolometer can now be installed, aligned, and calibrated.  Finally, the
two-color interferometer path though the vessel vertical ports was roughly
aligned this week and a new vacuum window tested in situ.

PLC and PARAGON software for the CRYO system has now been checked out and the
new hardware debugged. The system has been run up to the point of actually
putting LN2 into the sump.  However, the structure and coil thermocouples that
allow us to monitor cooling are still being re-installed.  Vessel heater and
thermocouple re-installation is nearing completion, but several days of
testing and debugging still remain once all connections are made.  Work also
continues on the TF scanner.  Finally, bringing on line the CRYO system
allowed the cryostat to be purged and coil HiPot and ringing tests performed.
The magnets are now ready for operation.

The ECDC system has been checked out and operated into a dummy load.  Some
enhancements to the interlock system are still planned before routine
operation can begin. This work is now being carried out.

Preparations for a neutron calibration, to be conducted over a two day period,
have continued.  The detectors are being connected to the data system, and
moved into position where possible.  The calibration requires all igloo blocks
to be in place, which in turn requires all horizontal flanges to be installed. 
In addition, it must be done while up-to-air so that the source can be moved
to various locations in the vessel.  The calibration will therefore be one of
the last operations to be completed before pumpdown.

The second neutral particle analyzer is nearing completion. The analyzer 
(TFTR type with E||B) has been assembled and leak-checked. Baking of the
vacuum components is underway. Final testing of the various power supplies and
other subsystems are also underway. The analyzer will be installed at the
midplane of F port with scanning capabilities in the horizontal and vertical
directions. It is expected that the  diagnostic will be ready with the
start-up of the machine operations phase. It will be able of diagnose the
effects of the ICRF on the hydrogen and deuterium populations, and obtain an
independent measure of the ion temperature.

Martin Greenwald is attending the ESNET Review meeting in Chicago; he will be
making a presentation on computer network requirements for the Fusion Energy
program. Miklos Porkolab, Earl Marmar, and Bruce Lipschultz are attending
Field Work Proposal presentations at DoE Germantown.