TY  - CONF
AU  - Yuri, Y.
AU  - Fukuda, M.
AU  - Yuyama, T.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Transverse Profile Shaping of a Charged-Particle Beam using Multipole Magnets - Formation of Hollow Beams -
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The use of multipole magnets enables us to shape the transverse profile of a charged-particle beam into various ones that can never be realized through linear beam optics. To date, the formation of a large-area beam with a uniform transverse intensity distribution has been actually realized using octupole magnets in several accelerator facilities. In this presentation, we demonstrate the formation of different beam profiles using multipole magnets rather than existing rectangular uniform beams. Results of tracking simulations and beam-formation experiments will be shown on the formation of clear-cut beams with different cross-sectional shapes, depending on the order and strength of applied multipole magnets. The dynamic behavior of a beam focused with multipole magnets is also investigated theoretically to better understand the numerical and experimental results.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 184
EP  - 186
KW  - octupole
KW  - target
KW  - optics
KW  - multipole
KW  - radiation
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-MOPGW041
UR  - http://jacow.org/ipac2019/papers/mopgw041.pdf
ER  - 

TY  - CONF
AU  - Nakao, M.
AU  - Fukuda, M.
AU  - Hara, S.
AU  - Hara, T.
AU  - Hatanaka, K.
AU  - Kamakura, K.
AU  - Kanda, H.
AU  - Koay, H.W.
AU  - Morinobu, S.
AU  - Morita, Y.
AU  - Nagayama, K.
AU  - Saito, T.
AU  - Takeda, K.
AU  - Tamura, H.
AU  - Yasuda, Y.
AU  - Yorita, T.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Extraction System of Upgraded AVF Cyclotron of RCNP
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - The AVF cyclotron of RCNP have been utilized for the purposes of basic research in physics, RI production for medicine and industrial applications as well as injector of ring cyclotron. Increasing beam intensity without decreasing beam quality can make improvements in all purposes. The improvement and repair of the AVF cyclotron are being carried out currently. We designed the new LEBT, injection, acceleration and extraction systems and we report on the extraction system here. High extraction efficiency is indispensable when increasing the beam intensity since beam loss causes activation of apparatus. New extraction system consists of deflector electrodes and two gradient correctors and probes. One gradient corrector causes a horizontally focus effect on the beam and the other causes horizontally defocus effect to avoid spreading of the beam with strong defocus effect caused by the main cyclotron magnetic field. Simulation study confirmed that 10 MeV proton, 65 MeV proton and 140 MeV alpha particles with 2 mm × 3 mrad could pass through the newly designed extraction system and the existing beam transport line. Beam simulation has been performed by utilizing SNOP* and OPAL** codes.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 1993
EP  - 1996
KW  - proton
KW  - extraction
KW  - cyclotron
KW  - septum
KW  - injection
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-TUPTS028
UR  - http://jacow.org/ipac2019/papers/tupts028.pdf
ER  -