Alcator C-MOD  
			Weekly Highlight Report 
			July 15, 1993

The scheduled maintenance period begun last week is continuing on schedule:

Cell ventillation has been upgraded to 4000CFM, which should ameliorate
some of our low-oxygen alarm conditions during cooldown, and allow faster
access to the cell after runs.

An interlock such that a failure of the OH2 supply causes  a reclose of the
OH1 interrupter switch  has been installed. This interlock is required to
prevent such a failure from leading to an OH2 overcurrent condition at
higher pre-charges.  The OH1 interrupter circuit has been reconfigured to
the parallel configuration, allowing higher current operation at reduced
voltage.

The TMX supplies have had their transformer bracing upgraded. This corrects
a design flaw which was observed in the failure of one supply during the
recent campaign.

A multi-section ground-fault monitor and alarm has been implemented through
the UTILITY Paragon/PLC station.

Acessible seams in the LN2 cryostat which had been observed to be leaking
have been re-fiberglassed.  Internal instrumentation in the CRYO system
have been fixed.  The Paragon/PLC  software for the CRYO system has been
upgraded to allow manual control of individual valves.

Emergency exit aisles have been permanently marked on the floor of the
cell, in compliance with safety regulations. Cable trays and utility
bridges have been installed. Vacuum pump vent manifolds have been
installed.  

The Paragon Engineering file server has been replaced and tested. The
software for the HEAT PLC/Paragon system has been upgraded to allow
three-zone temperature control. 

All of the control-room VAXstation Model 4000/60 and 4000/90's had their
memory increased. 

The RF group has received from France sample test pieces of Boron Carbide-
coated TZM pieces. There had been no previous experience with B4C applied
to TZM, which is required for the protection tiles on the dipole antennas.
The test pieces appear to be satisfactory.

Plasma operation is scheduled to resume next week. As of this time, 9 new
mini-proposals have been submitted for research during the next run period.