Topic/Presenter: Optics / C. Stewart/M. Vincent

Question/Comment: 

How do we align the instrument and Lyot stop?

Submitted by: Bruce Gillespie


NIC-FPS Response:

On 2002-07-03, Jon Barentine supplied us with an instrument to
telescope alignment tolerance of 5 mm. This is much looser 
than the machining tolerances involved in the fabrication 
of NIC-FPS. We foresee no problems in aligning the instrument 
to the telescope that tip/tilting the tertiary cannot correct.

Tests on Zemax has shown that aligning the Lyot stop to the 
optical axis within NIC-FPS will be sufficient to accommodate 
any misalignments mentioned above. We expect to undersize 
the outer radius of the stop by 100-150 microns out of a 
~40 mm diameter. The centeral obstruction for the secondary 
will be similarly oversized.


Status: Further details at Critical Design Review.