cancelling my write due to construction noise
jwc at snf.stanford.edu
Thu Feb 21 10:20:42 PST 2008
Greetings Raith and Ebeam Users:
It should be noted and advised to Users that the dwell times of almost
any feature write written on any Ebeam tool is much much shorter in time
than the frequency of vibrations from the construction and demolition
activities ongoing in the neighborhood. In fact the amplitude of these
vibrations is somewhat less than what we experienced during the shoring
and pile driving operations of the Clark Center Bio-X project two years
ago. So far I have not seen any feature irregularity that could have
been caused by vibration.
On the other hand imaging particularly at slow scan rates will show many
horizontal image ripples as an artifact of the -Y scanning and
vibration, acoustic, and acceleration events.
If any user has what they think is a feature that was affected by these
issues please send me or post a copy for everyones review. I have been
writing some rather difficult gratings on 100 200 and 650 nm pitches and
have yet to find anything unusual.
Your comments are invited as this could prove to be an interesting
discussion on our beam tools mail list.
FYI: Construction activities generally finish at about 15:05 hours each
Ilya Fushman wrote:
> It looks like the dots I burn are not circular and jitter too much
> when I image. I'm assuming that this is construction noise. So I will
> not write. So afternoon jwc session is open.
> Ilya Fushman
> Applied Physics
> Stanford University
> cvitae.org/ilya/ <http://cvitae.org/ilya/>
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