منابع مشابه
The Green Bank Telescope
Following two months of very successful commissioning and the first science observations on the GBT (see the following articles), operation was suspended in early April, one month earlier than planned, to work on the azimuth track. As described in previous NRAO Newsletters, the azimuth track wear strips, on which the azimuth wheels roll, were shifting slightly in a circumferential direction as ...
متن کاملRangefinder Metrology for the Green Bank Telescope
A scanning laser rangefinder metrology system for the 100-meter Green Bank Telescope is de¬ scribed. Use of this system for correction of the primary reflector's shape and pointing of the tele¬ scope is described.
متن کاملThe Green Bank Telescope Active Surface System
During the design phase of the Green Bank Telescope (GBT), various means of providing an accurate surface (0.220 mm) on a large aperture paraboloid (100 m), were considered. Automated jacks supporting the primary reflector were selected as the appropriate technology since they promised greater performance and potentially lower costs than a homologous or carbon fiber design, and had certain adva...
متن کاملOut-Of-Focus Holography at the Green Bank Telescope
We describe phase-retrieval holography measurements of the 100-m diameter Green Bank Telescope using astronomical sources and an astronomical receiver operating at a wavelength of 7 mm. We use the technique with parameterization of the aperture in terms of Zernike polynomials and employing a large defocus, as described by Nikolic et al. (2006). Individual measurements take around 25 minutes and...
متن کاملGreen Bank Telescope Studies of Giant Pulses from Millisecond Pulsars
We have conducted a search for giant pulses from four millisecond pulsars using the 100m Green Bank Telescope. Coherently dedispersed time-series from PSR J0218+4232 were found to contain giant pulses of very short intrinsic duration whose energies follow power-law statistics. The giant pulses are in phase with the two minima of the radio integrated pulse profile but are phase aligned with the ...
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ژورنال
عنوان ژورنال: Physics Today
سال: 2000
ISSN: 0031-9228,1945-0699
DOI: 10.1063/1.1325196