Evaluation of the ALMA Prototype Antennas

ABSTRACT The ALMA (Atacama Large Millimeter Array) North American and European prototype antennas have been evaluated by a variety of measurement systems to quantify the major performance specifications. Near‐field holography was used to set the reflector surfaces to 17 μm rms. Pointing and fast‐switching performance was determined with an optical telescope and by millimeter‐wavelength radiometry, yielding 2 \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\arcsec$\end{document} absolute and 0 \documentclass{aastex} \usepackage{a...