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Title: A Permanent-Magnet Microwave Ion Source for a Compact High-Yield Neutron Generator

Abstract

We present recent work on the development of a microwave ion source that will be used in a high-yield compact neutron generator for active interrogation applications. The sealed tube generator will be capable of producing high neutron yields, 5x1011 n/s for D-T and ~;;1x1010 n/s for D-D reactions, while remaining transportable. We constructed a microwave ion source (2.45 GHz) with permanent magnets to provide the magnetic field strength of 87.5 mT necessary for satisfying the electron cyclotron resonance (ECR) condition. Microwave ion sources can produce high extracted beam currents at the low gas pressures required for sealed tube operation and at lower power levels than previously used RF-driven ion sources. A 100 mA deuterium/tritium beam will be extracted through a large slit (60x6 mm2) to spread the beam power over a larger target area. This paper describes the design of the permanent-magnet microwave ion source and discusses the impact of the magnetic field design on the source performance. The required equivalent proton beam current density of 40 mA/cm2 was extracted at a moderate microwave power of 400 W with an optimized magnetic field.

Authors:
;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
1023399
Report Number(s):
LBNL-4665E
TRN: US1104527
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: CAARI 2010 21st International Conference on the Application of Accelerators in Research and Industry, Fort Worth, Tx, 08/08/10-08/13/10
Country of Publication:
United States
Language:
English
Subject:
46; ACCELERATORS; BEAM CURRENTS; CURRENT DENSITY; DESIGN; ELECTRON CYCLOTRON-RESONANCE; ION SOURCES; MAGNETIC FIELDS; NEUTRON GENERATORS; NEUTRONS; PERFORMANCE; PERMANENT MAGNETS; PROTON BEAMS; TARGETS; Neutron generator, Microwave ion source, Active interrogation

Citation Formats

Waldmann, Ole, and Ludewigt, Bernhard. A Permanent-Magnet Microwave Ion Source for a Compact High-Yield Neutron Generator. United States: N. p., 2010. Web.
Waldmann, Ole, & Ludewigt, Bernhard. A Permanent-Magnet Microwave Ion Source for a Compact High-Yield Neutron Generator. United States.
Waldmann, Ole, and Ludewigt, Bernhard. Mon . "A Permanent-Magnet Microwave Ion Source for a Compact High-Yield Neutron Generator". United States. https://www.osti.gov/servlets/purl/1023399.
@article{osti_1023399,
title = {A Permanent-Magnet Microwave Ion Source for a Compact High-Yield Neutron Generator},
author = {Waldmann, Ole and Ludewigt, Bernhard},
abstractNote = {We present recent work on the development of a microwave ion source that will be used in a high-yield compact neutron generator for active interrogation applications. The sealed tube generator will be capable of producing high neutron yields, 5x1011 n/s for D-T and ~;;1x1010 n/s for D-D reactions, while remaining transportable. We constructed a microwave ion source (2.45 GHz) with permanent magnets to provide the magnetic field strength of 87.5 mT necessary for satisfying the electron cyclotron resonance (ECR) condition. Microwave ion sources can produce high extracted beam currents at the low gas pressures required for sealed tube operation and at lower power levels than previously used RF-driven ion sources. A 100 mA deuterium/tritium beam will be extracted through a large slit (60x6 mm2) to spread the beam power over a larger target area. This paper describes the design of the permanent-magnet microwave ion source and discusses the impact of the magnetic field design on the source performance. The required equivalent proton beam current density of 40 mA/cm2 was extracted at a moderate microwave power of 400 W with an optimized magnetic field.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {10}
}

Conference:
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