Abstract:The balloon-borne VLBI (very long baseline interferometry) is a radio telescope for space observation from the stratosphere in the submillimeter wave band. The primary reflector has an aperture of 3 m in diameter whose degradation of aperture efficiency is required to be less than 17 % under the deformation due to variations of elevation angle and temperature during observation. In order to alleviate the deterioration of the aperture efficiency, the sub-reflector is equipped with a focal position adjustment me… Show more
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