Characteristics of typical Pierce guns for PPM focused TWTs

Harper, Richard W.; Puri, Manish

doi:10.1063/1.38394

Cited by 3 publications

(2 citation statements)

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“…Early predictions were made by Harper (1989) and Gillingham (1991) that the high Antarctic plateau might be an excellent location for an astronomical observatory. Marks et al (1999) used balloon-borne microthermal sensors to profile the optical turbulence over the South Pole and found that the median freeatmosphere seeing was remarkably low, at 0.32″.…”

Section: Introductionmentioning

confidence: 99%

Thickness of the Atmospheric Boundary Layer Above Dome A, Antarctica, during 2009

Bonner¹,

Ashley²,

Cui³

et al. 2010

PUBL ASTRON SOC PAC

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The domes, or local elevation maxima, on the Antarctic plateau provide a unique opportunity for ground-based astronomy in that the turbulent boundary layer is so thin that a telescope on a small tower can be in the free atmosphere, i.e., the portion of the atmosphere in which the turbulence is decoupled from the effect of the Earth's surface. There, it can enjoy a free atmosphere which itself appears to offer superior conditions to that of temperate sites. This breaks the problem of characterizing the turbulence at Antarctic plateau sites into two separate tasks: determining the variability, distribution and thickness of the boundary layer, and characterizing the free atmosphere. In this article we tackle the first of these tasks using a high-resolution, low minimum sample height sonic radar (SODAR) called Snodar that has been specifically designed to characterize the Antarctic boundary thickness and structure. Snodar delivers a vertical resolution of 0.9 m, with a minimum sampling height of 8 m. Snodar sampled the first 180 m of the atmosphere with 0.9 m resolution every 10 s at Dome A, Antarctica between 2009 February 4 and 2009 August 18. The median thickness of the boundary layer over this period was 13.9 m, with the 25th and 75th percentiles at 9.7 m and 19.7 m, respectively. The data collected from Dome A also show that, while the boundary layer can be stable for several hundred hours at a time, it can also be highly variable and must be sampled on the time scale of minutes to properly characterize its thickness.

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Section: Introductionmentioning

confidence: 99%

Thickness of the Atmospheric Boundary Layer Above Dome A, Antarctica, during 2009

Bonner¹,

Ashley²,

Cui³

et al. 2010

PUBL ASTRON SOC PAC

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“…For all these reasons, the highest point on the plateau, Dome A, has been considered for many years to represent the ultimate observing site on the plateau, and hence the earth (Harper 1989;Gillingham 1991). The advantages are expected to be particularly strong in the far-infrared/submillimeter part of the spectrum, where the high altitude and low water vapor content can be expected to offer unparalleled transmission (Lawrence 2004).…”

Section: Motivationmentioning

confidence: 99%

The PLATO Dome A Site-Testing Observatory: Instrumentation and First Results

Yang¹,

Allen²,

Ashley³

et al. 2009

PUBL ASTRON SOC PAC

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The PLATeau Observatory (PLATO) is an automated self-powered astrophysical observatory that was deployed to Dome A, the highest point on the Antarctic plateau, in 2008 January. PLATO consists of a suite of site-testing instruments designed to quantify the benefits of the Dome A site for astronomy, and science instruments designed to take advantage of the unique observing conditions. Instruments include CSTAR, an array of optical telescopes for transient astronomy; Gattini, an instrument to measure the optical sky brightness and cloud cover statistics; DASLE, an experiment to measure the statistics of the meteorological conditions within the near-surface layer; Pre-HEAT, a submillimeter tipping radiometer measuring the atmospheric transmission and water vapor content and performing spectral line imaging of the Galactic plane; and Snodar, an acoustic radar designed to measure turbulence within the near-surface layer. PLATO has run completely unattended and collected data throughout the winter 2008 season. Here we present a detailed description of the PLATO instrument suite and preliminary results obtained from the first season of operation.

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Electron Beam Formation, Focusing, and Collection in Microwave Tubes

True¹

1995

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Characteristics of typical Pierce guns for PPM focused TWTs

Cited by 3 publications

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Thickness of the Atmospheric Boundary Layer Above Dome A, Antarctica, during 2009

Thickness of the Atmospheric Boundary Layer Above Dome A, Antarctica, during 2009

The PLATO Dome A Site-Testing Observatory: Instrumentation and First Results

Electron Beam Formation, Focusing, and Collection in Microwave Tubes

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