Alcator C-MOD Weekly Highlights  Dec. 22, 1993

The scheduled shutdown period is proceeding smoothly.

The ultrasonic inspection of the flywheel is complete.  No new indications
were located.  Better surface finish allowed improved resolution for this
inspection; as a consequence the sizes of several indications were determined
to be smaller than the previous estimates.  The alternator shaft was also
inspected; one previously identified  indication was shown to be the reflected
image of another indication. The flywheel assembly process is now complete;
balancing of the alternator and flywheel will begin in January.

New high tensile strength bolts have been installed and torqued to spec on the
east side of the bus tunnel, and similar work on the west side is nearly
complete. Final inspections of the east side of the bus tunnel have been
completed, and we will be able to close up this side of the tunnel next week.

Borescope inspections of the upper OH connections showed that the connections
are still in very good shape.  Inspection of the central OH coax cooling
passage indicated that the felt metal contacts held up extremely well in this
very critical region. Final inspection of the bus connections to the TF coil
have been made.  All connections were found to be within the expected torque
range.  A redesign effort was begun to modify the horizontal port nearest the
TF connections (A-Port) so that inspection of the TF connections will be
easier in the future.  All horizontal port extensions except A-port are now
back on the machine.

Inside the vessel, removal of tile modules from the EF1 area continues.
Fabrication of the new anti-torque pins and replacement tiles continues.  A
decision has been made to replace the outer-divertor module current shunts
with a new design. The location of the shunts required long radial pathlengths
for the current and correspondingly high upward forces.  The shunts will now
be incorporated as part of the support structure where short current
pathlengths can be maintained.
 
The updating of the SUMMARY Database has been completed. Entries for 2311
shots from the 1993 C-MOD campaign are included. 

Dr. Dirck Dimock of Princeton Scientific Instruments, Inc. (PSI) visited the
PFC this week for discussions with respect to a proposed collaboration on a
Divertor Thomson Scattering System, involving PSI, PPPL, and MIT.  

Samples of boron carbide-coated Faraday shield rods for the ICRF dipole
antennas have been received from SNMI (France). The thickness of the coating
has been measured and looks good. The sand-blasting technique used to insure
proper adherence of the B4C coating to the copper-plated inconel rods has been
determined to be acceptable.