From:
irby@PSFC.MIT.EDU
Reply-To: IRBY@PSFC.MIT.EDU
Subject: Alcator C-Mod
Weekly Highlights
Newsgroups: sci.physics.plasma
Organization:
MIT
Alcator
C-Mod Weekly Highlights
October
26, 2001
The disassembly of the machine was completed this
week with the removal
of the OH2 lower coax. Inspections of the TF components and coaxes
continues. Work also continued on the Lower Hybrid
Project, the inner
divertor, and the DNB.
Physics
-------
We
are very happy to announce that Amanda Hubbard has agreed to lead our
new
Advanced Tokamak Task Force. Its
purpose will be to identify and
detail projected Alcator C-Mod AT
operational scenarios, and ensure that
preparations are made to address
them experimentally.
Preparations
for APS/DPP continued this week.
Inspection
----------
The
disassembly of Alcator C-Mod is complete.
The lower OH2 coax has been
removed and inspection of this critical
component has begun. As found on
the
upper coax connections, some relaxation in the torque of one of the
outer coax
bolts was discovered. We continue to
analyze this problem with
both simulations of the coax and bench
measurements of the components.
A careful inspection of the TF
components continues.
Inner
Divertor
--------------
Welding of studs on the inner wall
began this week, and fitups of the
divertor plates to the studs indicated
very good positioning of the studs.
A nice picture of the fitup may be
seen at
http://www.psfc.mit.edu/cmod/operations/EngImages/Inspection_2001-2002/Disassembly_Assembly/part4/P0002308.JPG
Lower
Hybrid MIE Project
------------------------
Progress continues
on the HVPS installation. Wiring of the
lights and
receptacles is nearly complete. Wiring is ongoing between the HV
transformers in the lower
container and the power modules in the upper
container. The HV triax cable is being run.
Wiring
of the HV Junction Box is proceeding.
Wiring between the lower
distribution box and the components in the
upper junction box is taking place.
Wiring of the transmitter
control and protection cabinets is ongoing.
Currently, two cabinets are
being wired. The third is partially
complete
and is being used to test the control and protection
circuits. Once wiring
is completed
on the first cabinet, it will be used for testing so that
wiring of the
third cabinet can be completed.
Design of the pump controller box
was completed this week. The
printed
circuit board and other parts to assemble the box was
ordered.
Mechanical design of the water system flexible hoses is
currently
underway. Once the hose
lengths are determined, a drawing will be generated
and sent out for
bids. The flexible hoses will be
necessary to completely
test the water system under pressure.
The
commissioning start date of the HVPS has been changed from October 30th
to
January 8th 2002. Problems discovered
in a similar supply being
commissioned at Wendelstein W7-X indicate
retrofits to our supply will be
required (at the vendor's expense). These changes should not affect
our
overall LH schedule.
DNB and Related Diagnostics
---------------------------
The
current DNB will be removed from the cell and replaced with a
beam with a
much higher main energy component.
Removal of the beam
began with identification of equipment that
can be recycled into the
new system.
Arrangements for staging the present components prior to
crating,
shipping, and storage were started. All
power sources for
the beam were locked out so that disassembly could
begin. Written
procedures have
been partially completed for removal of sheet metal duct,
filament power,
HV coax arc notcher, suppressor, and dump switch as this
activity must be
conducted so that it does not interfere with other C-Mod
work. The design
for the new CXRS system is moving forward.
The arrangement
of fibers in the entrance plane and the design for
the curved slits is underway.
In preparation for the F-port flange review,
a set of drawings was
assembled for distribution at the end of this
week. A conceptual
drawing for
the mods to the ECE mirror was completed for distribution.
C-Mod
Quarterly Review
----------------------
A Quarterly Review was
held on October 24th via video conference with
participants at DoE, MIT,
UTexas, and PPPL. After introductory
remarks
by Earl Marmar, the C-Mod facilities, Lower Hybrid Project, and
the
status of the DNB and related diagnostics were discussed in talks
by
Jim Irby, Montgomery Grimes, and Bob Granetz.
Attending
were
DoE: Rostom Dagazian, Chuck Finfgeld, Warren Marton,
Earl
Oktay, T.V. George
The University of Texas: Bill Rowan, Don
Patterson
PPPL: Gerd Schilling, Joel Hosea, Stefano Bernabei, Remi
Dumont,
Greg Pitonak (DoE), Gerrit Kramer, Skip Schoen, Randy
Wilson,
MIT: Ian hutchinson, James Irby, Earl Marmar, Miklos
Porkolab, Ron Parker,
Paul Woskov, Amanda Hubbard, Montgomery Grimes, Bob
Granetz, Howard Yuh,
Chris Boswell