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Technical Briefs

Cylindrical IEC Fusion Neutron Source for Broad Area NAA

[+] Author and Article Information
George H. Miley

Department of Nuclear, Plasma, and Radiological Engineering,  University of Illinois, 216 Talbot Laboratory, 104 S. Wright Street, Urbana, IL 61801ghmiley@illinois.edu

Hiromu Momota, Hugo Leon, Ben Ulmen, Guilherme Amadio, Atanu Khan, George Chen, William Matisiak, Ali Azeem, Paul Keutelian

Department of Nuclear, Plasma, and Radiological Engineering,  University of Illinois, 216 Talbot Laboratory, 104 S. Wright Street, Urbana, IL 61801

J. Eng. Gas Turbines Power 133(12), 124502 (Sep 14, 2011) (6 pages) doi:10.1115/1.4002889 History: Received July 14, 2010; Revised September 30, 2010; Published September 14, 2011; Online September 14, 2011

The development of a unique long cylindrical neutron source for broad area neutron activation analysis (NAA) is presented. This source uses inertial electrostatic confinement (IEC) to produce 2.54 MeV D-D or 14.1 MeV D-T fusion neutrons. The IEC offers a variety of applications ranging from security inspection stations to driven-subcritical research assemblies. This IEC design uses a biased grid to initial in a unique “star” mode plasma discharge creating beam-background gas (target) fusion reactions. They routinely produce ∼108 2.54 MeV D-D neutrons/s at steady state. Pulsed operation has achieved upto 109 n/s. (∼1011 n/s if a deuterium mixture is used). Indeed, a version of the IEC has been commercially produced as a portable neutron source for industrial NAA applications. While that IEC source used spherical geometry, the present work uses a cylindrical version which provides a unique long “linelike” neutron source for use in the present broad area NAA system.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Illustration of a spherical IEC. The discharge between the grid and vacuum wall creates an ion source that is extracted and directed toward the center by the negative grid. A photo of a typical UEC camber is in the center. A photo of the discharge through the view port shows the star mode discharge where ion beams pass through the grid openings. This allows long run times since ion bombardment of the grids, hence grid wire sputtering, is minimized.

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Figure 2

The two versions of the cylindrical IEC: (a) axially convergent ion beams (termed as the C-device) and (b) with radically convergent ion beams (termed as the RC-IEC), giving a dense fusion region along the axis

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Figure 3

Photograph of the C-device prototype

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Figure 4

Block diagram of pulsed power system

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Figure 5

Schematic (view from top) of a broad coverage IEC inspection system for luggage inspection

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Figure 6

Further illustration of the integrated system for ship container inspection

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