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[ATM] Re: PLOP Calculations
> Richard suggests the RTV blobs instead of low friction
> axial supports, dispensing with the sling entirely.
> My intuitive take on this is that attaching anything to
> the mirror not having the same CTE is asking for trouble.
Not to mention the momentum the beams or triangles will impose on the mirror
back. This momentum can be significant when thedistance beam-mirror is
relatively large. Imagine PLOP results where the support points are pushing
/ pulling with up to 10% of the nominal force, when pointed near horizon.
Quick calculation example:
10" x 3/4" (i.e. 2kg) plate mirror, 6-point cell: three 75mm beams, 3mm
blobs of RTV
The maximum push or pull force is (2 x 3mm / 75mm) x the nominal Force per
support, or 8%
How many waves of surface deformation is this, in terms of PLOP?
/Arjan
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