Title :
Calibration loads for ALMA
Author :
Yagoubov, P. ; Murk, A. ; Wylde, R. ; Bell, G. ; Tan, G.H.
Author_Institution :
Eur. Southern Obs., Garching, Germany
Abstract :
This paper presents the design of the ALMA Calibration Loads based on the folded cone geometry. The design is supported by ray-tracing simulations of the multilayer absorber cones and comprehensive thermal analysis. Experimental verifications of the Loads´ performance included reflection measurements between 30-700 GHz with a vector network analyzer and radiometric tests at different frequencies between 91 GHz and 700 GHz.
Keywords :
astronomical techniques; calibration; millimetre wave measurement; radiometry; radiotelescopes; ray tracing; shapes (structures); thermal analysis; ALMA calibration load; comprehensive thermal analysis; folded cone geometry; frequency 30 GHz to 700 GHz; multilayer absorber cones; radiometric test; ray tracing simulation; reflection measurement; vector network analyzer; Backscatter; Calibration; Nonhomogeneous media; Radiometry; Temperature; Temperature measurement; Temperature sensors;
Conference_Titel :
Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2011 36th International Conference on
Conference_Location :
Houston, TX
Print_ISBN :
978-1-4577-0510-6
Electronic_ISBN :
2162-2027
DOI :
10.1109/irmmw-THz.2011.6105120
