Cascade vacuum problem (please read)

[Mihir Tendulkar]

All,

      Last week it was discovered that the Cascade has a vacuum  
problem for the 13mm piece setting (vacuum holes in the center of the  
chuck).

      The switch is broken and has been taped to maintain vacuum. DO  
NOT FLIP THE 13mm SWITCH OR REMOVE THE TAPE.

      The central holes have continuous vacuum due to the broken  
switch. I've placed a dummy wafer over the holes to stop the leak when  
the system is not in use. If you use the system, please put the dummy  
piece in the 3" holder next to the system (labeled SW10). When you are  
done measuring, please replace the dummy sample.

      I will contact the Cascade technician tomorrow. I don't know how  
long it will take to fix, so let's work together to keep it running in  
the meantime. Thanks.

-- 
Mihir Tendulkar
Applied Physics PhD Candidate
Nishi Group, Stanford University