Newsgroups:
sci.physics.plasma
From IRBY@CMOD2.PFC.MIT.EDU Wed Jan 3 12:19:47 1996
From:
IRBY@CMOD2.PFC.MIT.EDU
Organization: MIT
Subject: Alcator C-MOD
Weekly Highlights
Alcator
C-MOD Weekly Highlights
Jan
3, 1996
After a two-week maintenance period, Alcator C-Mod
will resume operation this
week. The major activities during the
maintenance period included final
preparations for boronization, and an
upgrade to the EF1 power supply.
The boronization procedures have
now been reviewed, and we are ready for
delivery of the diborane by the
end of this week. Security measures
for
the power room and cell will be stepped up once the diborane has
been
installed in the cell gas cabinet.
Instrumentation and control software
and hardware has been
debugged, and we are ready for full system tests with
helium gas
substituting for the diborane. The
Chromex spectrograph
diagnostic is being upgraded to provide more views
around the torus
so that information about the toroidal symmetry of the
boron deposition
can be obtained.
The new transformer for the
EF1 power supply has been installed and is
now undergoing tests. This upgrade will allow higher voltages to
be
applied to the EF1 coils with a resulting improvement in plasma
control.
Some additional ground fault instrumentation was also installed,
since the
new transformer completely decouples the EF1 upper and lower
supplies,
which previously shared a common ground.
We continue
to work on transmitter 3 and 4 installation.
Power
room layouts are now complete, and some of the new components
have
been moved into position. In addition, components from the old
EF4
power supplies have been removed from the power room to make room
for
the new equipment. The new
dummy load is now ready for installation,
and the 13.8 kV cables from the
fuse disconnect to the switch-gear
have been run.
The cryopump
prototype assembly has been delayed somewhat by late
delivery of the
bellows which form the LHe containment pots.
However,
assembly of the pump is now moving quickly. The PC/PLC control hardware
and
software development is well underway.
This system will monitor pump
temperatures and pressures and
control the LN2 and LHe flow to the pump.
H.G. Esser will be
arriving this week from Julich to work with us on
the boronization. He has also volunteered to take moly test
samples
exposed to the ECDC discharge back with him for analysis.