From: Jim Terry <TERRY@PSFC.MIT.EDU>
Reply-To: TERRY@PSFC.MIT.EDU
Subject: Alcator C-Mod Weekly Highlights
Newsgroups: sci.physics.plasma
Organization: MIT


Alcator C-Mod Weekly Highlights
July 20, 1999


Tokamak operations resumed last week. July 15th was devoted
to power supply testing and check-out. A full length, clean
tokamak plasma was obtained the next day (Friday). RF power
was coupled into the plasma through the E port antenna. It
was poorly tuned, but otherwise the system worked as it should
have. After this, the run was halted because of concerns about
overheating the alternator during the heat wave (> 95 deg. F)
experienced in the northeast last week. (The river water
used for alternator cooling was hotter than normal.)
Tokamak-plasma runs are scheduled for Wednesday, Thursday, and
Friday of this week. They will be devoted to RF conditioning.

Abstracts to the American Physical Society - Division of Plasma
Physics meeting, to be held in November, were submitted. From
C-Mod there will be 4 Invited Oral presentations, 11 Contributed Orals,
and 32 Contributed Posters. A list of the first authors and titles of
the oral presentations follows:

Invited:

Bonoli, P., (MIT), ``Mode Conversion Electron Heating in Alcator C-Mod:
Theory and Experiment''

Boivin, R., (MIT), ``Effects of Neutral Particles on Edge Dynamics in
Alcator C-Mod Plasmas''

Rice, J., (MIT), ``Toroidal Rotation in Alcator C-Mod Plasmas with No
Direct Momentum Input''

Pitcher, C.S., (MIT), ``The Effect of Divertor Baffling on Alcator C-Mod
Discharges''

Contributed Orals:

Terry, J., (MIT), ``Recent Results from Alcator C-Mod''
Mossessian, D., (MIT), ``H-Mode Pedestal Measurements on Alcator C-Mod''
Granetz, R., (MIT), ``Impurity Transport and H-mode Edge Pedestals in
Alcator C-Mod''
Pedersen, T., (MIT), ``Poloidal Asymmetries in Soft X-ray Pedestals
from Alcator C-Mod''
Mikkelsen, D., (PPPL) ``Ion Temperature Gradient Scale Length in Alcator
C-Mod: Theory and Experiment''
Taylor, G., (PPPL) ``Electron Power Deposition During ICRF Heating on C-Mod''
In, Y. (MIT) ``Observation of n=1 Resistive Interchange Mode in low-beta
Plasmas''
Mazurenko, A., (MIT) ``New Results from the Phase Contrast Imaging on
Alcator C-Mod''
Heard, J., (Auburn Univ.) ``Cross-field Particle Transport through the
Separatrix and Scrape-off Layer in Alcator C-Mod''
Goetz, J., (MIT) ``Impurity Screening Studies on Alcator C-Mod''
Boswell, C., (MIT) ``2-D Profiles of Volume Recombination in the Alcator
C-Mod Divertor''


Engineering
-----------

The RF power systems are nearing operational capability. Initially,
the FMIT #1 transmitter, which feeds the D port antenna, delivered
1 MW into a dummy load. Subsequently, leaks in the transmitter
cooling channels were found and repaired. Again the power output
was successfully tested into a dummy load, and this system is
now being conditioned into vacuum. FMIT #2, powering the E port
antenna, has passed the operational tests of 1.4 MW into a dummy
load and 90 kW into vacuum. FMIT #3 and #4 feed the J port 4-strap
antenna. The phase shifter in the FMIT #3 transmission line, which
had arced, was repaired, reassembled, and re-calibrated. Vacuum
conditioning of the #3 and #4 power trains will begin today, July 20.


Travel and Visitors
-------------------

A large fraction of the physics staff is attending the meeting
in Snowmass, CO on ``Opportunities and Directions in Fusion
Energy Science for the Next Decade''.

Dr. Christopher Watts of Auburn Univ. visited for the week of July 12th.
He was working with John Heard on hardware modifications and documentation
for the ECE correlation radiometer.

Dr. Ron Bravenec was on-site beginning July 16. He will remain through
July 22, measuring D-alpha profiles and working on BES CAMAC data
acquisition.