Formation of a large-area uniform ion beam using multipole magnets in the TIARA cyclotron

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

doi:10.1016/j.nima.2011.03.055

Cited by 14 publications

(4 citation statements)

References 11 publications

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“…For MeV-class heavy-ion beams, the energy loss due to multiple scattering is significant. The foil is, therefore, placed in the location where the beam envelope is not a local minimum and the betatron phase from the scattering foil to the target was optimized in order to enhance the scattering effect with the energy loss as low as possible [5,12]. The scattering angle, energy, and chargestate distribution of the scattered beam agreed well with the theory [13,14] and SRIM simulation [15].…”

Section: Methodsmentioning

confidence: 58%

“…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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Section: Methodsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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

Self Cite

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“…One is to scan beams and the other is to expand beam diameter. Beam expansion optics [7] is applied for this purpose. It is difficult to obtain average low current density, spatial density minimum was selected in this case.…”

Section: Cooling With Latent Heatmentioning

confidence: 99%

Diffusion bonded Be neutron target using 8MeV proton beam

Kurihara

Kobayashi

2020

EPJ Web Conf.

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The development of the high intensity compact neutron source is mainly conducted by using accelerators for medical purposes. Recently, a lot of compact neutron sources have been developed, and most of them are for boron neutron capture therapy (BNCT). Compared with the common accelerators used for industries, accelerators for BNCT have to accelerate a 100 times larger current of charged particles because of the low conversion efficiency of neutron moderators. To attain a reliable target for the BNCT neutron source, two obstacles have to be overcome; radiation damage (blistering) and heat issue. We introduce diffusion bonding method aiming to make defect free Be neutron target and 1 MPa latent heat water-cooling system. We also install beam expansion optics using quadrupole and octupole magnets to reduce the charge density. Our facility has been operating for more than three years from the commissioning period and we report the recent situation as following. 1) Diffusion bonding method was applied to the solid neutron target of Be with latent heat cooling system. 2) Amount of integrated coulomb value of protons implanted to the Be target is nearly 3000 C now 3) Amount of neutron dose rate was measured. 4) A laser reflection microscope (LRM) method has been developed to observe the neutron target condition (especially radiation damage) through viewport with a few meters working distance. 5) Direct observation of the surface of the Be target was done during the period of improving nearly target vacuum and residual radiation conditions. From these evidences, we conclude our neutron target already produces neutrons capable to treat nearly 500 patients of malignant melanoma.

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“…Solar cells for space use and polymer films are irradiated at the LD beamline in a vacuum. At the LB beamline, a large-area beam formation method using the non-linear focusing force of multipole magnets was developed for efficient low-fluence irradiation without a beam scanner [14]. Two couples of octupole and sextupole magnets are installed near the end of the beamline.…”

Section: Large-area Uniform Irradiation Apparatusmentioning

confidence: 99%

Irradiation Facilities of the Takasaki Advanced Radiation Research Institute

Kurashima

Satoh

Saitoh

et al. 2017

QuBS

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Abstract:The ion beam facility at the Takasaki Advanced Radiation Research Institute, the National Institutes for Quantum and Radiological Science and Technology, consists of a cyclotron and three electrostatic accelerators, and they are dedicated to studies of materials science and bio-technology. The paper reviews this unique accelerator complex in detail from the viewpoint of its configuration, accelerator specification, typical accelerator, or irradiation technologies and ion beam applications. The institute has also irradiation facilities for electron beams and 60 Co gamma-rays and has been leading research and development of radiation chemistry for industrial applications in Japan with the facilities since its establishment. The configuration and utilization of those facilities are outlined as well.

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Formation of a large-area uniform ion beam using multipole magnets in the TIARA cyclotron

Cited by 14 publications

References 11 publications

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

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

Diffusion bonded Be neutron target using 8MeV proton beam

Irradiation Facilities of the Takasaki Advanced Radiation Research Institute

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