From:
IRBY@CMOD.PFC.MIT.EDU
Date: Sun, 7 Jun 1998 8:21:06 -0400
Reply-To:
IRBY@PSFC.MIT.EDU
Message-ID:
<980607082106.25a0dbce@CMOD.PFC.MIT.EDU>
Subject: Alcator C-Mod
Weekly Highlights
Newsgroups: sci.physics.plasma
Organization: MIT
Plasma Fusion Center
Alcator C-Mod Weekly Highlights
June 8, 1998
Engineering:
Work continues on the TF magnet
repair. All arm and core fingers
have
been sealed and clean up of the finger surfaces has begun.
The new
inductive heating unit is in house and being installed.
Fixturing for the
inductive heating process has been designed and fabrication
has
begun. Procedures are being developed
to insure an efficient
production cycle of fixture installation, inductive
heating soldering
of feltmetal, cleanup, and inspection. Tests of silver plating and
electroforming
procedures will continue over the next few days.
The bus work for the full scale TF finger joint test is in
house, and
design of the fixtures to hold the joint and connect it to the
bus is
underway. The CAMAC and PLC
hardware and software for this test is now
being debugged. The small area feltmetal test has run its
first sample for
approximately 20 thousand cycles. Analysis of the sample has begun.
A
complete testing program for the feltmetal has been outlined including
tests
of feltmetal lifetime vs temperature, pressure, silver plating
thickness,
and current density.
Development
of the DNB for C-Mod continues. The
crowbar control
electronics circuit board is fully designed. The coax connections inside
the Mod/Reg
cabinet have been made up and installed for the tube
current monitor, the
crowbar current monitor, and the crowbar trigger.
The mechanical design
for the crowbar enclosure is complete, and the front
panel and enclosure
is being fabricated. Continued progress
was made on
wiring the arc/filament/snubber, MCL, and PLC interfaces. A board was laid
out for the fast fiber
links. The CXRS in-vessel lenses were
procured, and
the lens system was successfully bench tested.
Work on FMIT#4 last week primarily
involved the procurement of
the materials needed to repair the arc damage
in the input cavity as discussed
last week.
Visits and
Travel:
Nobuaki
Asakura visited from JAERI/JT-60U last week.
He spent
the time primarily discussing the similarities and
differences between
C-Mod and JT-60U probe results. His main contact person was Brian
LaBombard,
but he spent time discussing other aspects of C-Mod and JT-60U
operation with
Jim Terry, John Goetz, Bruce Lipschultz, Spencer Pitcher and
Ian Hutchinson.
Dr. Asakura also gave a seminar covering results with the
new JT-60U divertor.
We had
2 short visits from Alberto Loarte (currently at NET) and
Raymond Monk
(from JET) last week. The 2-D B2-EIRENE
modelling of C-Mod
by Loarte was discussed. He is finding results that
seem to support a recent paper by
Umansky regarding transport in the SOL.
The future direction of this
modelling was also discussed. Ray
Monk
also participated in these discussions.