Alcator C-MOD Weekly Highlights
				April 28, 1994


Final preparations were completed this week, and the Phase II Operating
Campaign has now begun. The first attempt at plasma operation is scheduled for
today. 

Additional discharge cleaning (ECDC) was carried out over the weekend. ECDC in
D2 is being carried out this morning, prior to the run. Depending on results
of the first plasma runs, we will now be employing our standard pre-run
conditioning procedures. 

Cooldown of the machine structure to cryogenic operating temperature was
completed on Tuesday. 

Diagnostic installation and calibration is continuing. The PCX neutral particle
analyzer has now been installed in the cell. The TCI interferometer is
operational. The SRL Shearing Interferometer has been installed. The new halo
current rogowskis were calibrated during TF tests. 

Live power system tests were begun last Friday. The first experiment
(Miniproposal #042) of the present campaign was a non-plasma experiment, carried
out in conjunction with the power tests, to determine the dynamic response
(transfer function) of the Hybrid/Power Supplies/Coils/Structure. Single
supplies are driven with different frequency oscillating voltages (between 20
and 500 Hz) through the hybrid, and the resulting currents on all coils and on
internal magnetics are observed. These results will be used to improve our
modeling of the dynamic system response and better analyze the closed loop
behavior of the control system. This experiment was also a very stringent test
of the new PCS software, including the multiple segment feature; a couple of
minor bugs were uncovered and fixed.

During the power testing we found that one flux loop (out of 26) had been
damaged during the recent vent. The analysis and control algorithm software
have been modified to recognize the bad loop and compensate appropriately.