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Journal Articles

Numerical and experimental study of H$$^{-}$$ beam dynamics in J-PARC LEBT

Shibata, Takanori*; Ikegami, Kiyoshi*; Liu, Y.*; Miura, Akihiko; Naito, Fujio*; Nammo, Kesao*; Oguri, Hidetomo; Okoshi, Kiyonori; Otani, Masashi*; Shinto, Katsuhiro; et al.

Proceedings of 29th International Linear Accelerator Conference (LINAC 2018) (Internet), p.519 - 521, 2019/01

Transport process of negative hydrogen ion (H$$^{-}$$) in LEBT (Low Energy Beam Transport) is investigated by comparison of experimental and numerical results. A three dimensional Particle-In-Cell (PIC) particle transport model has been developed in order to take into account (i) axial magnetic field by two solenoids in J-PARC LEBT and (ii) radial electric field by space charge (SC) effect. Ratio of H$$^-$$ beam particles inside the RFQ (Radio Frequency Quadrupole) acceptance to the total particles at the RFQ entrance is calculated for different current conditions in LEBT solenoid 1 and 2. The results are compared with RFQ transmission rate measured in the J-PARC linac commissioning. The double peak of RFQ transmission rate to the solenoid applied current seen in the measurement is explained by the calculation results. The results indicate that presence of the LEBT orifice for differential pumping plays a role as a collimator to reduce emittance at RFQ entrance.

Journal Articles

Beam monitor for J-PARC linac accelerator

Tomisawa, Tetsuo; Kishiro, Junichi; Igarashi, Zenei*; Lee, S.*; Hiroki, Fumio

Proceedings of 28th Linear Accelerator Meeting in Japan, p.428 - 430, 2003/08

It is an important factor whether to have a beam loss held how, and the part of the beam diagnosis is important with the accurate beam transport, the occurrence of the high quality beam to accelerate a high intensity proton beam to handle with J-PARC linac accelerator safely. It responds to the purpose, and the beam monitor used for this beam diagnosis has it variously. There are an electric current monitor, a phase monitor, a beam position monitor, a profile monitor, a beam size monitor, a screen monitor, a beam loss monitor, and so on. Report it about these beam monitors in the present condition.

Journal Articles

Development of visual beam adjustment method for the beam transport

Agematsu, Takashi; Arakawa, Kazuo; *

Cyclotrons and Their Applications 1998 (Cyclotrons'98), p.232 - 235, 1998/00

no abstracts in English

JAEA Reports

None

; Toyama, Shinichi; ; Konashi, Kenji; Sasao, Nobuyuki; Sato, Isamu

PNC-TN8410 91-048, 92 Pages, 1991/02

PNC-TN8410-91-048.pdf:1.75MB

None

Journal Articles

Bunching system of the linac for SPring-8

Yoshikawa, Hiroshi; Nakamura, Naoki*; ; ; ; ; Yokomizo, Hideaki

Proc. of the 8th Symp. on Accelerator Science and Technology, p.304 - 305, 1991/00

no abstracts in English

Journal Articles

Operation of ECR and multi-cusp ion sources for JAERI AVF cyclotron

Yokota, Wataru; Ishibori, Ikuo; Okumura, Susumu; Agematsu, Takashi; Fukuda, Mitsuhiro; Nara, Takayuki; Kamiya, Tomihiro; Nakamura, Yoshiteru; Arakawa, Kazuo; Tachikawa, T.*; et al.

Proc. of the 8th Symp. on Accelerator Science and Technology, p.70 - 72, 1991/00

no abstracts in English

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