Newsgroups: sci.physics.plasma
From IRBY@CMOD2.PFC.MIT.EDU Tue May 28 21:37:21 1996
From: IRBY@CMOD2.PFC.MIT.EDU
Organization: MIT
Subject: Alcator C-MOD Weekly Highlights

Alcator C-MOD Weekly Highlights
May 28, 1996

Our maintenance period continues. Work proceeds on the divertor,
the divertor cryopump, RF systems, TF cooling, and diagnostic upgrades.
Welding of the divertor support plates is more than 60% complete.
All machining operations are complete on 20% of the plates. Outer
divertor modules can be re-installed invessel beginning late this week
or early next week.
The invessel fitup of the divertor cryopump is going well. A minor
change to the mounting hardware will be needed to leave more space for a flux
loop that runs under the divertor module. The pump vacuum feedthrough mated
properly with its flange. Measurements have been made that were needed to
complete fabrication of the 300K shield. A test fitup of the GH outer
divertor module, which covers the cryopump, will be done as soon as the module
is ready for installation. Following the fitup, the pump will be returned to
the vacuum test stand where PLC program development can continue, and more
pumping speed tests can be made.
The closed loop de-ionized water cooling system for the new
transmitters is nearly finished. The PLC interface control and indicator
wiring is complete. Work has begun on modifications to the new transmitter
driver cabinets. Support hardware for the new 9" coax runs is being
installed.
PLC control cabling to the new TF control valves is complete. PLC
programming and debugging can now proceed.
All alternator instrumentation has been re-installed and checked,
and the alternator is ready for operation. It will be brought up to
speed over the next two weeks.
Work continued on several other engineering and diagnostic systems.
The ceramic tubes that will house the retro-reflectors for the new tangential
interferometer were sent out to the vendor where the retro-reflectors will be
installed. Stainless steel standoffs for the new glow discharge system are
now fabricated and will be sent out for an electrically insulating spray
coating. The electrical feedthroughs for the glow discharge system are now
being installed on D-top flange. A final design review of the C-port
horizontal flange modifications was held and changes to the flange can
now begin. A-top flange is being modified for installation of a new RF
probe.
Brian LaBombard, Garry McCracken, and Bruce Lipschultz were at the
PSI meeting in France last week. Yuichi Takase was in Garching at both an
ITER design review meeting and the European Coordinating Committee
Meeting on Fast Wave Heating and Current Drive.

Contributions to the PSI meeting included:

Invited paper --

Experimental Investigation of Transport Phenomena in the Scrape-off Layer
and Divertor, B. LaBombard, J. Goetz, I. Hutchinson, D. Jablonski, J. Kesner,
C. Kurz, B. Lipschultz, G.M. McCracken, A. Niemczewski, J.L. Terry.

Contributed oral --

Modification of the Divertor Detachment Onset Density
B. Lipschultz, B. LaBombard, G.M. McCracken, J. Goetz, H. Ohkawa,
Y. Takase and J.L. Terry.

Contributed posters --

A Comparison of Impurity Screening Between Limiter and Divertor Plasmas in
the Alcator C-Mod Tokamak, R.S. Granetz, G.M. McCracken, F. Bombarda,
J.A. Goetz, D. Jablonski, B. LaBombard, B. Lipschultz, H. Ohkawa,
J. Rice, J.L. Terry, Y. Wang.

Screening of Recycling and Non-Recycling Impurities in the Alcator
C-Mod Tokamak, G.M. McCracken, R.S. Granetz, B. Lipschultz, B. LaBombard,
F. Bombarda, J.A. Goetz, D. Jablonski, S. Lisgo, D. Jablonski, H. Ohkawa,
J. Rice, P.C. Stangeby, J.L. Terry, Y. Wang.

Local Impurity Puffing as a Scrape-off Layer Diagnostic on the Alcator
C-Mod Tokamak, D. Jablonski, B. LaBombard, G.M. McCracken, S. Lisgo,
B. Lipschultz, I.H. Hutchinson, J.L. Terry, and P.C. Stangeby.