From: wolfe@PSFC.MIT.EDU
Reply-To: WOLFE@PSFC.MIT.EDU
Subject: Alcator C-Mod Weekly Highlights
Newsgroups: sci.physics.plasma
Organization: MIT



Alcator C-Mod Weekly Highlights
January 4, 2002



Over the last week we have continued to make progress on the inspection, the
Lower Hybrid MIE Project, the new DNB, and the new inner divertor.


Inspection
----------

A final test assembly of the OH2 Lower coax was made on Friday and left
over the weekend with pressure indicating film between the terminal
pocket, feltmetal, and coax. If resistance measurements and the film
results are positive, we will be ready to begin C-Mod reassembly early
next week.


Operations
----------

We continued work on C-Mod Cryo, Heat, TC scanners, and some diagnostic
systems this week. A vendor for ceramic coating of components for the
new MHD antennas is being selected. We also continue work on the
wideband rf amplifier needed to drive the antenna. Updates to our PLC
engineering drawings continued. Work on the new TF and thermocouple
scanners continued.


Lower Hybrid MIE Project
------------------------

The water cooling pumps for the klystrons have been powered up successfully.
Some debugging of the controller relay box may be required. We continue
work on protection and control circuitry. The first klystron cart has
been moved into position on the new mezzanine in the cell.
Each cart supports four klystrons.

Representatives from the HVPS vendor will be here next week to help with
commissioning of the power supply. This process is expected to take
several weeks.


ICRF Systems
------------

Component procurement has been completed for the control system upgrade
to the stub tuners and phase shifters. We are now ready to implement this
new upgrade. A transmitter model including the drivers is nearly
complete. A plasma model for simulating the loading and coupling
is also being developed.


DNB and Related Diagnostics
---------------------------

The support modification design was completed for the Budker beam.
The fueling system design can now be completed with the recent
responses from Budker Institute. The control system implementation
for the beam is underway. Specifically, PLC software modification,
C-Mod shot synchronization software, and PC acquisition for local
control are all underway. The primary power transformer has been
installed and AC power is to be run to it. The support design for
the pulse transformer are complete and ready for work to begin.


Inner Divertor
--------------

We continued to install invessel cable runs for the new inner divertor
diagnostics. All 240 silver-plated nuts holding the Rear Girdle plates
on the inner wall studs have been torqued up to 21 ft-lbs. The high-strength
bolts which hold the C-Plates to the Rear Plates have been hand-tightened, and
will be torqued up this week.