Raith system off line through tonight. Vacuum pump system problems, mechanical pump...

James Conway jwc at snf.stanford.edu
Mon Jan 14 12:15:49 PST 2008

Good Afternoon,

Mechanical pump or sensing issues have us off line this afternoon.  I am 
trying to recover system vacuum in attempt to bring system back up.

More information at 5 PM...

James Conway

-------- Original Message --------
Subject: 	Shutdown raith SNF 2008-01-14 12:07:19: mechanical pumping and 
sensing issues
Date: 	Mon, 14 Jan 2008 12:07:19 -0800
From: 	jwc at snf.stanford.edu
To: 	raith-pcs at snf.stanford.edu

Users last evening reported issues during session...  
Loss of vacuum to chamber and isolation of FE-Gun section.  
Several attempts to restart vacuum system encountered thermal overload of mechanical vacuum pump and/or 
time outs of vacuum target set points while waiting for turbo pump to come to speed. 
Suspect worn out mechanical pump motor or thermal switch or less likely possible failed penning gage in system chamber.
Three resets have encountered same problem.  Allowing pump to cool for an hour.  

Replacement mechanical pump requested from RAITH USA Inc asking for shipment on today's FED-X for overnight.  Will they make the truck?!!


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