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• W139556617 abstract "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. I. INTRODUCTION achieved and define a system that can be easily maintained over its lifetime. As a benchmark we note that to achieve a 1 % enhancement in sensitivity by increasing the collecting area of the array would cost an estimated $US 2-3M. Al- though this document does not deal directly with cost, reli- ability, or maintenance issues it gives sufficient details of optical performance evaluation for the trade-offs to be exam- ined once those other issues are addressed. Since the optics is an area where sensitivity may be easily compromised, this memo discusses performance of low-loss optics in detail. Relevant concerns are: dissipative and scat- tering losses; spillover losses; receiver and telescope aberra- tions; window sizes; materials; infrared filters; feed elements; frequency dependence; and geometrical constraints. We start with a general discussion of the effects of optical losses on system performance. This is followed by a survey of the properties of materials available for millimeter and sub-millimeter optical components. Pertinent characteristics of various optical elements and their influence on perform- ance are covered. Finally, we look at general design princi- ples for high performance optical systems illustrated by a design example. This uses concepts of paraxial beams includ- ing higher order effects required to describe the non-Gaussian nature of real feeds. All the parameters affecting sensitivity by a fraction of a percent or more are discussed quantita- tively." @default.
• W139556617 created "2016-06-24" @default.
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• W139556617 date "2001-01-01" @default.
• W139556617 modified "2023-09-24" @default.
• W139556617 title "Optics Study for ALMA Receivers" @default.
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