ALMA Memo No. 324 Proposal for ALMA Front End Optics
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Antenna 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...
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In this memo, we present measured phase drift data of a YIG-tuned oscillator (YTO) multiplied to mmwave frequencies, a prototype of the baseline ALMA LO source. The test setup and analysis algorithms are described. We also discuss phase drift added by mmwave multipliers and power amplifiers, with the conclusion that their contribution is insignificant. Various components and system concepts are...
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In this memo we argue that interoperability between the existing radio-interferometry packages provides a fast, robust, flexible, complete, and user-friendly data reduction package for ALMA. We discuss the meaning of these terms from the point of view of the end-user, the data reduction specialist, and the package maintainer, and show that an open software environment provides a cost effective,...
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With over 600 receiver cartridges, ALMA will have several thousand SMA connectors, many of which will be subjected to periodic cryogenic cooling. At present, ALMA has no specifications on the proper torquing of SMA connectors nor on whether any type of staking should be used. This note summarizes the experience of a number of engineers involved with receiver construction for radio astronomy and...
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تاریخ انتشار 2000