[labnetwork] After-hours work in cleanroom and laboratories

[Daniel Christensen]

At the University of Wisconsin-Madison the cleanrooms are accessible 
24/7 and we enforce a buddy policy outside of our normally staffed hours 
(M-F 8:00 a.m. to 5:00 p.m.).  The buddy policy requires 2 users to be 
in the cleanroom suite (spread throughout any of the bays).We allow all 
activities to be conducted off-hours except equipment maintenance 
operations, but researchers are encouraged to do processing 
using hazardous gases only when staff is in the building. The hazardous 
gas vaults themselves are highly restricted and cannot be accessed 
except by a very few staff.

We have video cameras installed throughout the cleanroom.The output goes 
to our hard drive storage system and we put a video monitor into each of 
the cleanroom bays.We have the live video output on display at all times 
on these monitors.The displays sequence through the cameras.The idea is 
to allow a user in Bay 8 to see what is going on in Bays 1-7 while they 
are sitting at their tool.Also we hoped that the users would further 
realize that they are being monitored for proper after hours 
behavior.However, I don't think the presence of the display monitors has 
changed behavior.

Our 8 cleanroom bays are contiguous and have a single entry point where 
the gowning room door connects to a central clean corridor.We have a pc 
_on each side_ of this door to allow for "log-in" and "log-out" of the 
cleanroom . This log in/out of the cleanroom enters data into our 
"Coral-like" lab monitoring system (called CRESS) which allows for 
real-time monitoring of everyone in the cleanrooms .CRESS keeps a 
running total of the "body count" in the cleanroom.The system generates 
a report to the staff of buddy system violations.

During non-business hours (remember to do special programming to make 
M-F holidays buddy hours) the system does the following:

-When no one is in the cleanroom, two users must log in with-in a couple 
of minutes of each other to enter.

-When there are >2 users in the cleanroom, a user may leave the 
cleanroom as normal.

-When there are just two users left in the cleanroom and "User A" tries 
to leave, the logout pc tells"User A" that they are leaving a lone 
user.The pc then allows them to click a button to continue their exit or 
another button to abort their exit.Normally, "User A" will then click to 
exit followed within a couple of minutes by User B exiting via the 
logout pc.

-We consider it a buddy system violation for BOTH "User A" and User B" 
in the above scenario if User A leaves the cleanroom and User B doesn't 
leave very shortly thereafter.

-- 
Daniel C. Christensen
Laboratory Manager
WI Center for Applied Microelectronics
University of WI-Madison
608-262-6877

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