Stanford Raith 150 Status Friday 18:30 hours -- we have been unable to identify the root cause of the vacuum pumping problem so far.

James Conway jwc at
Fri Jun 13 18:43:28 PDT 2008

Greetings Raith Users:

The RAITH system will remain in shut down mode and we will be off line 
to all users over the weekend.  Qualified Users may utilize the raith 
computer to prepare their GDS II patterns, etc...

We encountered vacuum pumping problems Monday early morning and in the 
course of troubleshooting the system have swapped out the Membrane 
mechanical pump and now the Turbo pump in an effort to restore vacuum to 
the system.  Today we spent the entire afternoon leak checking all 
components in line between the turbo and mechanical pumps and we still 
cannot achieve suitable vacuum to reach the set point to fire up the ion 
pumps in the column.  The mechanical pump vacuum level is at the 
specified 2000 mt pressure.  We are unsure if the turbo pump or 
controller are functioning properly but it was reported to have been 
tested after it was rebuilt by Pro-Vac in Santa Cruz.

We will continue troubleshooting the system on Monday late morning. 

Thank you for your support!

James Conway
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