[asac] [almanews] ALMA Memo 359 Released

[Carolyn White]

ALMA Memo 359

Optics Study for ALMA Receivers

James Lamb

March 2001

The design of the receiver optics plays a crucial part in the ultimate
sensitivity of the ALMA array. We present some general design concepts to
guide the development of the optical layout of the final
receivers. Relevant properties of materials used in the optical path are
examined, and various types of optical elements are discussed. General
principles of high efficiency optical train designs are presented. In
general, simple systems are advocated, with minimal truncation losses.
The areas which have the greatest uncertainty are the windows and infrared
filters where the trade-offs between the RF losses, infrared blocking,
pressure resistance and gas permeability have to be carefully
considered. A sample design for Band 3 is given.


View a PDF version of ALMA Memo #359
     http://www.alma.nrao.edu/memos/html-memos/alma359/memo359.pdf

Download a postscript version of ALMA Memo #359
     http://www.alma.nrao.edu/memos/html-memos/alma359/memo359.ps
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