Transformation of the Transverse Beam Intensity Distribution by Sextupole Focusing in a Transport Line

Yuri, Yosuke; Yuyama, Takahiro; Ishizaka, Tomohisa; Ishibori, I.; Okumura, Susumu

doi:10.1143/jpsj.81.064501

Cited by 3 publications

(2 citation statements)

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“…The sextupole-focusing case has been obtained in Ref. [6]. The beam centroid, which can be obtained from the first-order moment in Eq.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…The transverse intensity distribution of the beam can be transformed into a uniform one through the nonlinear focusing force produced with multipole magnets (mainly, octupole magnets) in the nonlinear focusing method [1,2]. Actually, the uniform beam formation has been realized in several facilities using octupole [3][4][5] and sextupole magnets [6]. The nonlinear focusing method is attracting attention as a new technique for uniform irradiation with high-intensity beams in accelerator-driven neutron facilities: The use of multipole magnets is developed or planned in many high- power neutron facilities now in operation or under construction [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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

Yuri

Yuyama

Ishizaka

et al. 2014

Plasma and Fusion Research

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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.

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“…The sextupole-focusing case has been obtained in Ref. [6]. The beam centroid, which can be obtained from the first-order moment in Eq.…”

Section: Theoretical Analysismentioning

confidence: 99%