Epi2 status

[maurice stevens]

The epi has had repeated problems this week with chamber over pressure.  
The system protects itself for damage by going into isolation.
Ted has replaced the pressure control valve (PCV) twice this week and we 
are still seeing the problem.  We will look at the pump tomorrow.

The pressure deviation/overpressure  always happens during the etch 
program.  So the system is not getting a complete etch.    We have shut 
the system down tonight because if we continue to put deposits on the 
dome (without etching) we will have to open the system and replace it.

We will send an update tomorrow.

-m


-- 
maurice at stanford.edu

Maurice Stevens
Stanford Nanofabrication Facility
CIS Room 142, Mail Code 4070
Stanford, CA  94305
P. (650)725-3660
F. (650)725.6278