Reflector & Single Pixel Feed Panel Discussion

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Presentation transcript:

Reflector & Single Pixel Feed Panel Discussion Offset Optics SKA 2010, Manchester Lynn Baker 23 March 2010 Lynn Baker SKA 2010

Advantages of shaped, offset optics Clear optical path, low spillover, low edge illuminations. High aperture efficiency and low noise temperature. Low wide angle sidelobes “Real estate” to mount feeds and receivers Modest cost increase relative to symmetric paraboloid 23 March 2010 Lynn Baker SKA 2010

Example of 15 meter aperture design 23 March 2010 Lynn Baker SKA 2010

Design parameters Clear optical path, low spillover, low edge illuminations. High aperture efficiency and low noise temperature. Low wide angle sidelobes DVA-1. 23 March 2010 Lynn Baker SKA 2010

Physical Optics Analysis, Perfect Feed 23 March 2010 Lynn Baker SKA 2010

Comments & Caveats Analysis is for a perfect feed and perfect reflectors Corrugated horns can achieve close to this performance Surface errors will increase sidelobes Wide band feeds have reduced performance See German Cortes talk on Wed. afternoon 23 March 2010 Lynn Baker SKA 2010

12 Meter Conceptual Design, DVA-1 23 March 2010 Lynn Baker SKA 2010