Volume measurement of cryogenic deuterium pellets by Bayesian analysis of single shadowgraphy images.

Volume measurement of cryogenic deuterium pellets by Bayesian analysis of single shadowgraphy images. Research Abstract Details 

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Volume measurement of cryogenic deuterium pellets by Bayesian analysis of single shadowgraphy images. Abstract Text:

T Szepesi,S ,G Kocsis,P T Lang,C Wittmann,

In situ commissioning of the Blower-gun injector for launching cryogenic deuterium pellets at ASDEX Upgrade tokamak was performed. This injector is designed for high repetitive launch of small pellets for edge localised modes pacing experiments. During the investigation the final injection geometry was simulated with pellets passing to the torus through a 5.5 m long guiding tube. For investigation of pellet quality at launch and after tube passage laser flash camera shadowgraphy diagnostic units before and after the tube were installed. As indicator of pellet quality we adopted the pellet mass represented by the volume of the main remaining pellet fragment. Since only two-dimensional (2D) shadow images were obtained, a reconstruction of the full three-dimensional pellet body had to be performed. For this the image was first converted into a 1-bit version prescribing an exact 2D contour. From this contour the expected value of the volume was calculated by Bayesian analysis taking into account the likely cylindrical shape of the pellet. Under appropriate injection conditions sound pellets with more than half of their nominal mass are detected after acceleration; the passage causes in average an additional loss of about 40% to the launched mass. Analyzing pellets arriving at tube exit allowed for deriving the injector's optimized operational conditions. For these more than 90% of the pellets were arriving with sound quality when operating in the frequency range 5-50 Hz.

Volume measurement of cryogenic deuterium pellets by Bayesian analysis of single shadowgraphy images. Publishing Authors By Initials

T Szepesi,S ,G Kocsis,PT Lang,C Wittmann,

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Volume measurement of cryogenic deuterium pellets by Bayesian analysis of single shadowgraphy images. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Review of scientific instruments

VOLUME: 79

Page Numbers: 033501

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ISSN: 0034-6748

DAY: 1

MONTH: Mar

YEAR: 2008

Volume measurement of cryogenic deuterium pellets by Bayesian analysis of single shadowgraphy images. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Volume measurement of cryogenic deuterium pellets by Bayesian analysis of single shadowgraphy images.

AFFILIATION: KFKI Research Institute for Particle and Nuclear Physics, EURATOM Association, P.O. Box 49, H-1525 Budapest-114, HungaryMax-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstr. 2, 85748 Garching, Germany.

Country: United States

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MEDLINETA: Rev Sci Instrum

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