Subject: Comment raith SNF 2008-02-26 14:19:04: elevated vibration and RFI levels are evident in SEM view
From: jwc@snf.stanford.edu
Date: Tue, 26 Feb 2008 14:19:05 -0800

Good Afternoon RAITH Users:
Elevated levels of Vibration and Radio Frequency Interference are present in the Ebeam
Lab today. 
Users working overnight and this morning have reported that SEM image views of contamination
shot dots are appearing to wave or wiggle with a regular frequency and amplitude (RFI)
in addition to a new very large amplitude signal from vibrations coming  into the Ebeam
Lab and building.  This was presumed to be from the current SEQII construction, just
across the street last week; but we are now seeking new sources of this vibration from
elsewhere in the lab or CIS building as it is present 24/7.
Users are requested to note any new signals observed or possible sources that these
perterbations can be traced to.
James Conway