Transformation of the Beam Intensity Distribution and Formation of a Uniform Ion Beam by Means of Nonlinear Focusing

Avoiding undesirable thermal stress or damage of a target vessel is an essential subject in high-intensity beam irradiation for accelerator-driven neutron production. A promising method to tailor the transverse beam intensity distribution for uniform beam irradiation on the target is the use of mult...

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Bibliographic Details
Published inPlasma and Fusion Research Vol. 9; p. 4406106
Main Authors YUYAMA, Takahiro, OKUMURA, Susumu, ISHIBORI, Ikuo, YURI, Yosuke, ISHIZAKA, Tomohisa
Format Journal Article
LanguageEnglish
Published The Japan Society of Plasma Science and Nuclear Fusion Research 2014
Subjects
beam intensity distribution
beam transport system
ion beam
multipole magnet
octupole magnet
uniform irradiation
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ISSN1880-6821
1880-6821
DOI10.1585/pfr.9.4406106

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Summary:Avoiding undesirable thermal stress or damage of a target vessel is an essential subject in high-intensity beam irradiation for accelerator-driven neutron production. A promising method to tailor the transverse beam intensity distribution for uniform beam irradiation on the target is the use of multipole magnets. We, therefore, study the transformation and uniformization of the transverse intensity distribution by means of nonlinear focusing induced from multipole magnets. It is theoretically described how the intensity distribution is transformed and made uniform by the nonlinear focusing force. Large-area uniform proton and heavy-ion beams are experimentally formed using octupole magnets at the azimuthally-varying-field cyclotron in Japan Atomic Energy Agency.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.9.4406106