منابع مشابه
Mixer-Preamp to Receiver Interface Considerations for ALMA Band 6
The NRAO CDL is preparing to construct test receivers for use in production of the Band-6 mixer-preamps for ALMA. The discussion below applies primarily to the mixer-preamp to test receiver interface, but should also be useful as a guide to the mixer-preamp interface with the cartridges all the listed connections will be available on the mixer-preamp and can be used as desired by the cartridg...
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The front-end optical design for band 9 (600 to 720GHz) of the Atacama Large Millimeter Array (ALMA) is now completed and verified. A frequency independent design approach is used to couple radiation to the two orthogonal polarized mixed detectors from the large 12m ALMA Cassegrain telescope. As it is a heterodyne receiver, two local oscillator beam paths are integrated into the front-end optic...
متن کاملALMA Receiver Optics Design
A Workshop was held in Tucson in September 2000 to define a layout for the optics and dewar. Section 3 lists the design goals for the Workshop, and the configuration that emerged is detailed in this document. This includes the overall arrangement, and the details of the optics of the individual Bands. These bands are those defined by Wootten et al. [1] and endorsed with minor adjustment for Ban...
متن کاملAntenna beam pattern evaluation of ALMA band 9 subsystem
This report describes band 9 beam pattern measurements which were made at NA ALMA front end integration center during the visit of ALMA band 9 group representatives from 2 to 7 of June 2008. The Band 9 cartridge system was mounted within ALMA front end cryostat #2 and the overall system included the cryostat window and filters. Measurement set-up, experiment condition and sequence and results o...
متن کاملALMA MEMO 551 Cross-polarization characterization of GORE–TEXr slabs at band 9 frequencies
GORE–TEXr material, commonly used in radomes, is known to be transparent at microwave bands [1]. In ALMA a thin GORE–TEXr membrane will cover the aperture through which the RF beam enters the cabin at the primary vertex hole [2]. Slabs of GORE–TEXr are also generally employed in windows for intermediate temperature shields inside the cryostat. The purpose of these windows ideally is to allow th...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2015
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201425529