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Journal Articles

Multipacting studies for the JAEA-ADS five-cell elliptical superconducting RF cavities

Yee-Rendon, B.; Kondo, Yasuhiro; Maekawa, Fujio; Meigo, Shinichiro; Tamura, Jun; Cicek, E.*

Proceedings of 12th International Particle Accelerator Conference (IPAC 21) (Internet), p.793 - 795, 2021/08

The Five-cell Elliptical Superconducting Radio-Frequency Cavities (SRFC) provide the final acceleration in the JAEA-ADS linac (from 600 MeV to 1.5 GeV); thus, their performance is essential for the success of the JAEA-ADS project. After their optimization of the cavity geometry to achieve a high-acceleration gradient with lower electromagnetic peaks, the next step in the R&D strategy is the accurate estimation of beam-cavity effects which can affect the performance of the cavities. To this end, multipacting studies were developed to investigate its effect in the cavity operation regimen and find countermeasures. The results of this study will help in the development of the SRFC models and in the consolidation of the JAEA-ADS project.

Journal Articles

Electromagnetic design of the low beta cavities for the JAEA ADS

Yee-Rendon, B.; Kondo, Yasuhiro; Maekawa, Fujio; Meigo, Shinichiro; Tamura, Jun

Journal of Physics; Conference Series, 1350(1), p.012197_1 - 012197_7, 2019/12

Journal Articles

Design of the elliptical superconducting cavities for the JAEA ADS

Yee-Rendon, B.; Kondo, Yasuhiro; Maekawa, Fujio; Meigo, Shinichiro; Tamura, Jun

Journal of Physics; Conference Series, 1350(1), p.012198_1 - 012198_6, 2019/12

Journal Articles

Optical resonator optimization of JAERI ERL-FEL

Nagai, Ryoji; Hajima, Ryoichi; Sawamura, Masaru; Nishimori, Nobuyuki; Kikuzawa, Nobuhiro; Minehara, Eisuke

Nuclear Instruments and Methods in Physics Research A, 528(1-2), p.231 - 234, 2004/08

 Times Cited Count:2 Percentile:18.72(Instruments & Instrumentation)

An optical resonator geometry of JAERI ERL-FEL is optimized to ensure the high-power operation. Efficiency of the FEL strongly depends on performance of the optical resonator such as an output efficiency and interaction mode volume. The resonator geometry is optimized by maxmization of the output efficiency and minimization of the interaction mode volume. The output efficiency and the interaction mode volume of the optical resonator is calculated by a simulation code using Fox-Li procedure. To search rapidly with various parameters, the simulation code is improved utilizing Fast-Fourie-Transform.

Journal Articles

Feasilibity study of the K900 superconducting AVF cyclotron for materials science and biotechnology

Fukuda, Mitsuhiro; Okumura, Susumu; Kurashima, Satoshi; Miyawaki, Nobumasa; Ishii, Yasuyuki; Saito, Yuichi; Mizuhashi, Kiyoshi; Agematsu, Takashi; Chiba, Atsuya; Sakai, Takuro; et al.

Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.643 - 645, 2004/08

A superconducting AVF cyclotron with a bending limit of 900 MeV and a focusing limit of 300 MeV is being designed to meet the requirements for the research in materials science and biotechnology at TIARA facility of JAERI. The spiral-sector shape of the cyclotron magnet has been optimized for acceleration of a 300 MeV proton to produce sufficient focusing forces in an extraction region. An energy range of the superconducting AVF cyclotron overlaps with that of the present K110 JAERI AVF cyclotron. Characteristics of a resonator for the superconducting AVF cyclotron have been investigated using the MAFIA code. An acceleration voltage in a frequency range of 24 to 64 MHz can be produced by the resonator with a $$lambda$$/2 excitation mode.

Journal Articles

Reseach and development of superconducting twin quarter wave resonator for the acceleration of low velocity heavy ions

Kabumoto, Hiroshi; Takeuchi, Suehiro; Matsuda, Makoto; Nakanoya, Takamitsu

Dai-17-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.135 - 137, 2004/06

no abstracts in English

Journal Articles

Misalingment tolerance of a hole-coupling optical resonator for JAERI ERL-FEL

Nagai, Ryoji; Hajima, Ryoichi; Kikuzawa, Nobuhiro; Minehara, Eisuke; Nishimori, Nobuyuki; Sawamura, Masaru

Proceedings of 26th International Free Electron Laser Conference (FEL 2004) and 11th FEL Users Workshop (CD-ROM), p.255 - 257, 2004/00

no abstracts in English

Journal Articles

Beam development for flat-top acceleration in the JAERI AVF cyclotron

Kurashima, Satoshi; Miyawaki, Nobumasa; Fukuda, Mitsuhiro; Okumura, Susumu; Nara, Takayuki; Agematsu, Takashi; Ishibori, Ikuo; Yoshida, Kenichi; Nakamura, Yoshiteru; Arakawa, Kazuo

JAERI-Review 2003-033, TIARA Annual Report 2002, p.310 - 311, 2003/11

The JAERI AVF cyclotron provides a variety of ion beams especially for the research in biotechnology and materials science. Several cyclotron technologies such as cocktail beam acceleration, a uniform irradiation in a wide area and beam pulsation have been developed so far. A flat-top acceleration system for the JAERI AVF cyclotron has been designed to minimize the energy spread mainly for a microbeam production. The flat-top acceleration using fundamental and fifth-harmonic frequencies for an acceleration voltage is an excellent technique to reduce the energy spread.

Journal Articles

Operational status of superconducting resonators of the JAERI tandem-booster

Takeuchi, Suehiro; Matsuda, Makoto; Ishizaki, Nobuhiro; Tayama, Hidekazu; Iijima, Akihiko*; Yoshida, Takahiro*

Proceeding of 10th Workshop on RF Superconductivity (SRF 2001), p.591 - 593, 2001/00

no abstracts in English

Journal Articles

Linac RF control at transient beamloading

M.A.Chernogubovsky*; Sugimoto, Masayoshi

Nuclear Instruments and Methods in Physics Research A, 428(2-3), p.263 - 270, 1999/00

 Times Cited Count:0 Percentile:0.01(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

RF control at transient beamloading for high-duty-factor linacs

M.A.Chernogubovsky*; Sugimoto, Masayoshi

JAERI-Research 98-041, 29 Pages, 1998/08

JAERI-Research-98-041.pdf:1.32MB

no abstracts in English

Journal Articles

Estimation of optical resonator for FEL

Sawamura, Masaru; Nagai, Ryoji; Kikuzawa, Nobuhiro; Nishimori, Nobuyuki; Minehara, Eisuke

Free Electron Laser and Its Application in ASIA, p.195 - 199, 1997/00

no abstracts in English

JAEA Reports

Conceptual design of IFMIF accelerator RF systems

M.A.Chernogubovsky*; Sugimoto, Masayoshi

JAERI-Research 96-064, 9 Pages, 1996/12

JAERI-Research-96-064.pdf:0.64MB

no abstracts in English

JAEA Reports

Measurement system for the microwave surface resistance of oxide superconductors

*; Minehara, Eisuke; *

JAERI-M 91-074, 28 Pages, 1991/05

JAERI-M-91-074.pdf:0.91MB

no abstracts in English

Journal Articles

Fabrication and RF properties of the microwave cavity made of YBaCuO and BiPbSrCaCuO superconductors

Minehara, Eisuke; *; *; *

J. Supercond., 3(3), p.277 - 280, 1990/00

no abstracts in English

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