Re: [ATM] Re: ATM Digest, Vol 7, Issue 11

["Jeff Anderson-Lee" <jonah@cs.berkeley.edu>]

Arjan te Marvelde wrote:

>>In my study on 18 point cells I found that construction errors on the
>>order on 1 mm to 2 mm could seemingly result in varying amounts of
>>performance changes, depending on the cell design.  For non-refocus
>>    
>>
>
>Plop assumes that the supports are points.
>Would the design still be as sensitive for construction errors when the
>supports instead are pads of RTV, or some other compliant material?
>
To be honest, I don't know.  Several people have tried modeling broad 
supports in Plop, but the modeling has been more of "stiff" supports 
than "compliant" ones.  I don't know how to model compliant supports 
that are spread across and area using Plop.

Anecdotal evidence would seem to indicate that RTV pads work, but I do 
not have the tools to model them well enough to understand the physics 
of it all and whether they would be more tollerant of placement errors. 

It would seem that they might be more tolerant, but I have no proof of 
the fact.

Jeff

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