Newsgroups: sci.physics.plasma
From WOLFE@CMOD2.PFC.MIT.EDU Tue Jul 18 09:28:20 1995
From: WOLFE@CMOD2.PFC.MIT.EDU
Organization: MIT
Subject: Alcator C-Mod Weekly Highlights

Alcator C-MOD Weekly Highlights
July 17, 1995

Scheduled maintenance and upgrade activities are proceeding on Alcator C-MOD.

Planned machine inspection is now essentially complete. All of the TF coax
bolts have been checked and torqued to specified torque. The high strength
bolts at the first and last turn were also torqued to spec. All OH and EF
upper connections were checked for torque, frayed cables, loose LN2 lines,
insulation, etc. The OH-1 and OH-2U felt-metal connections were examined
with the borescope. These all looked good. The OH-1 and OH-2U thermocouple
and voltage sensing leads were tested and checked out ok.

All Cryo system inspections are complete. We found no problems with TF
cooling except that arms which had been observed to cool more slowly were
found to have longer feedlines. These feedlines have been shortened and are
now closer to the feed manifold.

Both E- and F-port inner/secondary seals have been inspected and the extensions
installed. Leak checking of the interseal space has been completed.

The upgrade of the EF2 supplies is well underway. The plan is to move TMX
modules from the present EF4 to increase the current capability on EF2, and
use supplies from Alcator C, presently at LLNL, to drive the EF4 coil.
Rewiring of TMX supplies is complete. Control circuitry changes are also
complete. Changes to the PARAGON control program are in progress. The new
EF4 power supplies from LLNL are now packaged for shipment. We will be
sending two engineers to LLNL for inspections and to monitor loading
procedures. Fabrication of the power room DC bus to connect the new EF4
supplies is underway.

F-port outer divertor module has been removed for checkout/repair of divertor
probes. All halo current monitoring shunts are now out of the machine. These
are being replaced with new halo rogowski coils at each of the outer divertor
modules. The floor mounting plates will be machined to accommodate these coils.
One such plate has been modified, and a test fitup performed to verify the
procedure.

The G10 insulation plate covering TF bus at A-port has been improved and
re-installed. A-port diagnostic stand extension for the edge Thomson
scattering has been completed and is ready for installation.

Roger Richards of ORNL was at M.I.T. working on his ion-scattering diagnostic.
Optical benches have been installed in the cell and diagnostics lab for this
experiment.