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Yamamoto, Masanobu; Ezura, Eiji*; Hara, Keigo*; Hasegawa, Katsushi*; Nomura, Masahiro; Omori, Chihiro*; Schnase, A.*; Shimada, Taihei; Takagi, Akira*; Takata, Koji*; et al.
JPS Conference Proceedings (Internet), 8, p.012015_1 - 012015_6, 2015/09
The J-PARC MR provides a coasting proton beam for nuclear physics experiments by slow extraction. The longitudinal emittance should be enlarged until the MR flat top to mitigate the microwave instability. We have investigated a Phase Modulation (PM) method by using a High Frequency Cavity (HFC) to increase the emittance. We have performed extensive simulation studies to find the appropriate parameters of the PM through the particle tracking simulation. We found that the effective HFC frequency has linear dependence with the PM frequency, where the emittance is smoothly enlarged. Furthermore, we found that the required HFC voltage is inverse proportional to the square root of the duration time of the PM. These PM properties will be used for the design of the HFC. We describe the particle tracking simulation results of controlled emittance blow-up by the PM.
Okawa, Tomohiro*; Ikegami, Masanori*
Proceedings of 2005 Particle Accelerator Conference (PAC '05) (CD-ROM), p.3091 - 3093, 2005/00
L3BT is beam transportation line from the linac to the 3-GeV RCS which is the part of the accelerators for the High-Intensity Proton Accelerator Facility Project, J-PARC. In this paper, especially results of the beam simulation of the injection section of the L3BT are presented. The injection section is necessary for a successful adjustment to the transported beam to the required parameters for ring injection. The matching of beams envelopes and dispersion function for space charge dominative beams are also discussed.
Hajima, Ryoichi
Nuclear Instruments and Methods in Physics Research A, 528(1-2), p.335 - 339, 2004/08
Times Cited Count：21 Percentile：77.22(Instruments & Instrumentation)Dilution of electron beam emittance through a return arc is one of critical problems in the design of an energy-recovery linac for high-power FEL and a synchrotron light source. We present that the emittance dilution can be compensated by establishing the matching between the phase ellipse orientation and the CSR kick direction, and the effect of coherent synchrotron radiation on the beam emittance dilution can be estimated from simple calculation of transfer matrices.
Kondo, Yasuhiro; Akikawa, Hisashi; Anami, Shozo*; Asano, Hiroyuki*; Fukui, Yuji*; Igarashi, Zenei*; Ikegami, Kiyoshi*; Ikegami, Masanori*; Ito, Takashi; Kawamura, Masato*; et al.
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.156 - 158, 2004/08
A commissioning of the J-PARC linac DTL1 is now under way at KEK. A 30mA H
beam was accelerated to 19.7-MeV, and 100% transmission was obtained with a 20-msec-pulse-width and 12.5-Hz-repetition beam. In this paper, present status of the DTL1 commissioning and preliminary results of the commissioning, such as emittance measurements, are presented.
Hajima, Ryoichi
Japanese Journal of Applied Physics, Part 2, 42(8A), p.L974 - L976, 2003/08
Times Cited Count：21 Percentile：61.22(Physics, Applied)A first-order transform matrix is proposed to calculate electron beam emittance dilution arising from coherent synchrotron radiation (CSR) in a next-generation light source based on an energy-recovery linac. The matrix approach enable us to scan a lot of parameters for the design of achromatic cells of minimum emittance dilution. The emitatce dilution can be minimized when the CSR wake dispersion matches to the betatron function envelope at the achromatic cell exit.
Hajima, Ryoichi
Proceedings of 28th Linear Accelerator Meeting in Japan, p.288 - 290, 2003/08
no abstracts in English
Watanabe, Kazuhiro; Iga, Takashi*; Morishita, Takatoshi; Kashiwagi, Mieko; Inoue, Takashi; Hanada, Masaya; Taniguchi, Masaki; Imai, Tsuyoshi
Proceedings of 28th Linear Accelerator Meeting in Japan, p.186 - 188, 2003/08
no abstracts in English
Watanabe, Kazuhiro
Purazuma, Kaku Yugo Gakkai-Shi, 78(6), p.535 - 540, 2002/06
Development of ion sources for International Fusion Materials Irradiation Facility (IFMIF) which is an accelerator based high intensity neutron source to test and develop materials for fusion machines has being conducted. Required specifications of the ion source are 100 keV, 155mA of D+ with CW operation. This report presents about the over view of the IFMIF and present status of the ion source development.
Iga, Takashi*; Okumura, Yoshikazu; Kashiwagi, Mieko
JAERI-Tech 2001-028, 16 Pages, 2001/05
JAERI-Tech-2001-028.pdf:0.95MB
no abstracts in English
Ishizuka, H.*; Kawasaki, S.*; ; ;
Japanese Journal of Applied Physics, 35(10), p.5471 - 5478, 1996/10
Times Cited Count：4 Percentile：25.90(Physics, Applied)no abstracts in English
in a single channel electrostatic quadrupole acceleratorJ.W.Kwan*; G.D.Ackerman*; C.F.Chan*; W.S.Cooper*; G.J.de-Vries*; W.F.Steele*; Stuart, M. E.*; M.C.Vella*; Wells, R. P.*; Inoue, Takashi; et al.
Review of Scientific Instruments, 66(7), p.3864 - 3868, 1995/07
Times Cited Count：8 Percentile：59.35(Instruments & Instrumentation)no abstracts in English
Ishizuka, H.*; ; Kawasaki, S.*; Musyoki, S.*; ; ;
JAERI-M 94-047, 19 Pages, 1994/03
no abstracts in English
Nara, Takayuki; Yokota, Wataru; Nakamura, Yoshiteru; Fukuda, Mitsuhiro; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Arakawa, Kazuo
Proc. of the 9th Symp. on Accelerator Science and Technology, p.89 - 91, 1993/00
no abstracts in English
Yokota, Wataru; Nara, Takayuki; Arakawa, Kazuo; Nakamura, Yoshiteru; Fukuda, Mitsuhiro; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tachikawa, T.*; ; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.336 - 339, 1993/00
no abstracts in English
Okumura, Yoshikazu; Inoue, Takashi; Oguri, Hidetomo; Tanaka, Hideki*
Proceedings of 1992 Linear Accelerator Conference, Vol.2, p.645 - 647, 1992/11
no abstracts in English
