NDLI: FIRST MEASUREMENTS OF THE ION ENERGY DISTRIBUTION AT THE DIVERTOR STRIKE POINT DURING Dlll-D DISRUPTIONS

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FIRST MEASUREMENTS OF THE ION ENERGY DISTRIBUTION AT THE DIVERTOR STRIKE POINT DURING Dlll-D DISRUPTIONS

Content Provider	Semantic Scholar
Copyright Year	2008
Abstract	Plasma/wall interaction studies are being carried out using the Divertor Materials Exposure System (DiMES) on DIII-D. The objective of the experiment is to determine the kinetic energy and flux of deuterium ions reaching the divertor target during argon-induced radiative disruptions. The experiment utilizes a special slotted ion analyzer mounted over a Si sample to collect the fast charge-exchange (CX) deuterium neutrals emitted within the recycled cold neutral layer (CNL) which serves as a CX target for the incident ions. A theoretical interpretation of the experiment reveals a strong "forward" pitch-angle dependence in the approaching ion distribution function. The depth distribution of the trapped D in the Si sample was measured using low-energy direct recoil spectroscopy. Comparison with the TRIM code using monoenergetic ions indicated that the best fit to the data was obtained for an ion energy of 100 eV. An estimate of the CNL thickness Indl indicates that during disruptions the CNL "cushion" is thick enough to reduce the local ion heat load by -30% due to CX refluxing.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://digital.library.unt.edu/ark:/67531/metadc675215/m2/1/high_res_d/459432.pdf
Language	English
Access Restriction	Open
Subject Keyword	Analyzer, device Argon Cold Temperature Compute Node Linux Curve fitting Deuterium Ion-Exchange Chromatography Procedure Ions Kinetics Nikon CX format Plasma Reaching Recycling Reflux Thickness (graph theory)
Content Type	Text
Resource Type	Article

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