Flux Concentration During Solar Observation For Alma Antennas Abs.
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ALMA Memo # 575
Flux Concentration During Solar Observation For Alma Antennas
Fred Schwab and Jingquan Cheng
2008-01-06
This memo describes the calculation of the incident heat flux on the subreflector surface of an ALMA antenna when the bidirectional reflectance distribution function (BRDF) of the main reflector panels is known. Theory and related formulae are provided for the calculation. A convolutional approach is used in this memo. When the FWHM of the bidirectional scattering distribution function (BSDF) of the primary panel surface is large, the flux on the subreflector during solar observation is relatively small. The memo provides the flux numbers and the flux intensity on the subreflector.
View a pdf version of ALMA Memo #575.
