Computer Science – Performance
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8502o&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #85.02; Bulletin of the American Astronomical Society, V
Computer Science
Performance
Scientific paper
The Atacama Large Millimeter Array (ALMA) is a millimeter wavelength telescope. It comprises about fifty 12meter antennas located in Chile, South America. ALMA is an international astronomy facility. ALMA construction and operations are led on behalf of North America by the National Radio Astronomy Observatory (NRAO), operated by Associated Universities, Inc. (AUI). ALMA is scheduled to be completed and become fully operational by 2012.
In the summer of 2006, the prototype of the front end cartridge bias board of the ALMA telescope was simulated and measured to ensure that the bias box met the required specification before it was mass produced, assembled and finally shipped off to Chile for installation.
It is critical that the ALMA amplifiers meet their required performance specifications under normal operating conditions.
The Allan Variance stability, voltage and current noise densities are specified in the ALMA Front End Cartridge Bias Module Technical Specifications document number FEND-40.04.02.00-005-A-SPE. In order for the front-end cartridge to meet the required specifications, the bias voltage provided by the circuitry must be extremely stable and relatively free of noise. These specifications allow the given antenna resolution, imaging, array configuration, spatial resolution and sensitivity as stated in the ALMA scientific agreement to be met.
With my poster presentation, I intend to:
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Present the results of the observations and analysis I made at the NRAO site located in Green Bank, West Virginia and explain its relevance to the on-going ALMA project.
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Correlate the critical role of good engineering lay out and pre-design simulation of astronomical telescopes to their relative high performance based on my experience at Green Bank.
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Discuss the applications of intrinsic low noise amplifiers, filters, and miniature electrical components to Radio Astronomy.
Sponsors: The NRAO and NSF
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