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Journal Articles

Development of inter-digital H-mode drift-tube linac prototype with alternative phase focusing for a muon linac in the J-PARC muon g-2/EDM experiment

Nakazawa, Yuga*; Iinuma, Hiromi*; Iwata, Yoshiyuki*; Iwashita, Yoshihisa*; Otani, Masashi*; Kawamura, Naritoshi*; Mibe, Tsutomu*; Yamazaki, Takayuki*; Yoshida, Mitsuhiro*; Kitamura, Ryo; et al.

Journal of Physics; Conference Series, 1350, p.012054_1 - 012054_7, 2019/12

 Times Cited Count:0 Percentile:0.07

An inter-digital H-mode drift-tube linac (IH-DTL) is developed in a muon linac at the J-PARC E34 experiment. IH-DTL will accelerate muons from 0.34 MeV to 4.5 MeV at a drive frequency of 324 MHz. Since IH-DTL adopts an APF method, with which the beam is focused in the transverse direction using the rf field only, the proper beam matching of the phase-space distribution is required before the injection into the IH-DTL. Thus, an IH-DTL prototype was fabricated to evaluate the performance of the cavity and beam transmission. As a preparation of the high-power test, tuners and coupler are designed and fabricated. In this paper, the development of the tuner and the coupler and the result of the low-power measurement will be presented.

Journal Articles

Disk and washer coupled cavity linac design and cold-model for muon linac

Otani, Masashi*; Futatsukawa, Kenta*; Mibe, Tsutomu*; Naito, Fujio*; Hasegawa, Kazuo; Ito, Takashi; Kitamura, Ryo; Kondo, Yasuhiro; Morishita, Takatoshi; Iinuma, Hiromi*; et al.

Journal of Physics; Conference Series, 1350, p.012097_1 - 012097_7, 2019/12

 Times Cited Count:1 Percentile:65.18

A disk and washer (DAW) coupled cavity linac (CCL) has been developed for a middle velocity part in a muon linac to measure muon anomalous magnetic moment and search for electric dipole moment. I will accelerate muons from $$v/c$$ = $$beta$$ = 0.3 to 0.7 at an operational frequency of 1.3GHz. In this poster, the cavity design, beam dynamics design, and the cold-model measurements will be presented.

Journal Articles

Prototype of an Inter-digital H-mode Drift-Tube Linac for muon linac

Nakazawa, Yuga*; Iinuma, Hiromi*; Iwata, Yoshiyuki*; Iwashita, Yoshihisa*; Otani, Masashi*; Kawamura, Naritoshi*; Mibe, Tsutomu*; Yamazaki, Takayuki*; Yoshida, Mitsuhiro*; Kitamura, Ryo*; et al.

Proceedings of 29th International Linear Accelerator Conference (LINAC 2018) (Internet), p.180 - 183, 2019/01

We have developed an Interdigital H-mode (IH) Drift-Tube Linac (DTL) design with an alternative phase focusing (APF) scheme for a muon linac, in order to measure the anomalous magnetic moment and electric dipole moment (EDM) of muons at the Japan Proton Accelerator Research Complex (J-PARC). The IH-DTL accelerates muons from beta 0.08 to 0.28 at an operational frequency of 324 MHz. The output beam emittances are calculated as 0.315 $$pi$$ and 0.195 $$pi$$ mm mrad in the horizontal and vertical directions, respectively, which satisfies the experimental requirement.

Journal Articles

Development of a muon linac for the g-2/EDM experiment at J-PARC

Otani, Masashi*; Kawamura, Naritoshi*; Mibe, Tsutomu*; Naito, Fujio*; Yoshida, Mitsuhiro*; Hasegawa, Kazuo; Ito, Takashi; Kondo, Yasuhiro; Hayashizaki, Noriyosu*; Iwashita, Yoshihisa*; et al.

Proceedings of 28th International Linear Accelerator Conference (LINAC 2016) (Internet), p.1037 - 1041, 2017/05

We are developing a linac dedicated to the muon acceleration. It enables us to measure the muon anomalous magnetic moment with an accuracy of 0.1 ppm and search for electric dipole moment with a sensitivity of 10$$^{-21}$$ cm to explore beyond Standard Model of elementary particle physics. As a first step for demonstration of the muon acceleration, we are developing the source of slow muon with which RFQ acceleration is conducted. This paper describes status of these developments.

Journal Articles

The Muon linac for the precise measurement of muon g-2/EDM at J-PARC

Kondo, Yasuhiro; Hasegawa, Kazuo; Ito, Takashi; Artikova, S.; Otani, Masashi*; Mibe, Tsutomu*; Naito, Fujio*; Yoshida, Mitsuhiro*; Kitamura, Ryo*; Iwashita, Yoshihisa*; et al.

Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.66 - 69, 2016/11

We are developing a muon linac for the measurement of the muon anomalous magnetic moment and search for the muon electric dipole moment to explore beyond the Standard Model of elementary particle physics. This muon linac accelerate from room temperature to 212 MeV with normalized transverse emittances of about 1.5 $$pi$$ mm mrad. The muon linac consists of an ultra-slow muon source, a radio frequency quadrupole (RFQ) linac, an inter-digital H-mode drift tube linac (IH-DTL), a disk and washer coupled cavity linac (DAW CCL), and disk loaded structure (DLS) traveling-wave linac. In this paper, the status of the muon linac development, especially, the beam dynamics simulation is descried.

Journal Articles

Inter-digital H-mode drift-tube linac design with alternative phase focusing for muon linac

Otani, Masashi*; Mibe, Tsutomu*; Yoshida, Mitsuhiro*; Hasegawa, Kazuo; Kondo, Yasuhiro; Hayashizaki, Noriyosu*; Iwashita, Yoshihisa*; Iwata, Yoshiyuki*; Kitamura, Ryo*; Saito, Naohito

Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.858 - 862, 2016/11

We have developed an interdigital H-mode (IH) drift-tube linac (DTL) design with an alternative phase focusing (APF) scheme for a muon linac, in order to measure the anomalous magnetic moment and electric dipole moment (EDM) of muons at the Japan Proton Accelerator Research Complex (J-PARC). The IH-DTL accelerates muons from beta 0.08 to 0.28 at an operational frequency of 324 MHz. The output beam emittances are calculated as 0.315 $$pi$$ and 0.195 $$pi$$ mm mrad in the horizontal and vertical directions, respectively, which satisfies the experimental requirement.

Journal Articles

Development of muon linac for the muon g-2/EDM experiment at J-PARC

Otani, Masashi*; Naito, Fujio*; Mibe, Tsutomu*; Yoshida, Mitsuhiro*; Hasegawa, Kazuo; Ito, Takashi; Kondo, Yasuhiro; Hayashizaki, Noriyosu*; Iwashita, Yoshihisa*; Iwata, Yoshiyuki*; et al.

Proceedings of 7th International Particle Accelerator Conference (IPAC '16) (Internet), p.1543 - 1546, 2016/06

We are developing a linac dedicated to the muon acceleration. It enables us to measure the muon anomalous magnetic moment with an accuracy of 0.1 ppm and search for electric dipole moment with a sensitivity of 10-21e cm to explore beyond Standard Model of elementary particle physics. As a first step for demonstration of the muon acceleration, we are developing the source of slow muon with which RFQ acceleration is conducted. This paper described status of these developments.

Journal Articles

APF IH-DTL design for the muon linac in the J-PARC muon g-2/EDM experiment

Otani, Masashi*; Mibe, Tsutomu*; Yoshida, Mitsuhiro*; Hasegawa, Kazuo; Kondo, Yasuhiro; Hayashizaki, Noriyosu*; Iwashita, Yoshihisa*; Iwata, Yoshiyuki*; Kitamura, Ryo*; Saito, Naohito

Proceedings of 7th International Particle Accelerator Conference (IPAC '16) (Internet), p.1539 - 1542, 2016/06

We have developed an interdigital H-mode (IH) drift-tube linac (DTL) design with an alternative phase focusing (APF) scheme for a muon linac, in order to measure the anomalous magnetic moment and electric dipole moment (EDM) of muons at the Japan Proton Accelerator Research Complex (J-PARC). The IH-DTL accelerates muons from beta 0.08 to 0.28 at an operational frequency of 324 MHz. The output beam emittances are calculated as 0.315 $$pi$$ and 0.195 $$pi$$ mm mrad in the horizontal and vertical directions, respectively, which satisfies the experimental requirement.

Journal Articles

Interdigital $$H$$-mode drift-tube linac design with alternative phase focusing for muon linac

Otani, Masashi*; Mibe, Tsutomu*; Yoshida, Mitsuhiro*; Hasegawa, Kazuo; Kondo, Yasuhiro; Hayashizaki, Noriyosu*; Iwashita, Yoshihisa*; Iwata, Yoshiyuki*; Kitamura, Ryo*; Saito, Naohito

Physical Review Accelerators and Beams (Internet), 19(4), p.040101_1 - 040101_8, 2016/04

 Times Cited Count:16 Percentile:81.37(Physics, Nuclear)

We have developed an interdigital H-mode (IH) drift-tube linac (DTL) design with an alternative phase focusing (APF) scheme for a muon linac, in order to measure the anomalous magnetic moment and electric dipole moment (EDM) of muons at the Japan Proton Accelerator Research Complex (J-PARC). The IH-DTL accelerates muons from beta 0.08 to 0.28 at an operational frequency of 324 MHz. The output beam emittances are calculated as 0.315 $$pi$$ and 0.195 $$pi$$ mm mrad in the horizontal and vertical directions, respectively, which satisfies the experimental requirement.

Journal Articles

Status of ERL superconducting spoke cavity fabrication

Sawamura, Masaru; Hajima, Ryoichi; Nishimori, Nobuyuki; Nagai, Ryoji; Iwashita, Yoshihisa*; Tongu, Hiromu*; Kubo, Takayuki*; Saeki, Takayuki*

Proceedings of 12th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.583 - 586, 2015/09

no abstracts in English

Journal Articles

Demonstration of muon acceleration and cavity design of the muon linac for J-PARC E34

Otani, Masashi*; Mibe, Tsutomu*; Yoshida, Mitsuhiro*; Saito, Naohito; Kitamura, Ryo*; Iwashita, Yoshihisa*; Kondo, Yasuhiro

Proceedings of 12th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.56 - 61, 2015/09

We are developing a linac dedicated to the muon acceleration. It enables us to measure the muon anomalous magnetic moment with an accuracy of 0.1 ppm and search for electric dipole moment with a sensitivity of 10$$^{-21}$$e$$cdot$$cm to explore beyond Standard Model of elementary particle physics. As a first step for demonstration of the muon acceleration, we are developing the source of slow muon with which RFQ acceleration is conducted. This paper described status of these developments.

Journal Articles

Development of superconducting spoke cavities for laser Compton scattered X-ray sources

Hajima, Ryoichi; Sawamura, Masaru; Kubo, Takayuki*; Saeki, Takayuki*; Cenni, E.*; Iwashita, Yoshihisa*; Tongu, Hiromu*

Proceedings of 6th International Particle Accelerator Conference (IPAC '15) (Internet), p.2902 - 2904, 2015/06

A 5-year research program on the development of superconducting spoke cavities for electron accelerators has been funded by MEXT, Japan since 2013. The purpose of our program is establishing design and fabrication processes of superconducting spoke cavity optimized for compact X-ray sources based on laser Compton scattering. The spoke cavity is expected to realize a compact industrial-use X-ray source with a reasonable cost and easy operation. We have chosen a cavity frequency at 325 MHz due to possible operation at 4 K and carried out cavity shape optimization in terms of electromagnetic and mechanical properties. Production of press-forming dies is also in progress. In this paper, we present overview and up-to-date status of the research program.

Journal Articles

Development of muon linac for the muon g-2/EDM experiment at J-PARC

Otani, Masashi*; Mibe, Tsutomu*; Fukao, Yoshinori*; Saito, Naohito; Yoshida, Mitsuhiro*; Kitamura, Ryo*; Kondo, Yasuhiro; Iwashita, Yoshihisa*

Proceedings of 6th International Particle Accelerator Conference (IPAC '15) (Internet), p.2541 - 2544, 2015/06

Muon acceleration is beyond our experiences. It enables us to measure the muon anomalous magnetic moment with an accuracy of 0.1 ppm and search for electric dipole moment with a sensitivity of 10$$^{-21}$$ e$$cdot$$cm to explore beyond Standard Model of elementary particle physics. We are developing a linac dedicated to the muon acceleration and planning to try the muon acceleration by utilizing slow negative muonium production. This paper described status of these developments.

Journal Articles

Multipactor simulations in 325 MHz superconducting spoke cavity for an electron accelerator

Kubo, Takayuki*; Saeki, Takayuki*; Cenni, E.*; Iwashita, Yoshihisa*; Tongu, Hiromu*; Hajima, Ryoichi; Sawamura, Masaru

Proceedings of 6th International Particle Accelerator Conference (IPAC '15) (Internet), p.2892 - 2894, 2015/06

no abstracts in English

Journal Articles

Development of superconducting spoke cavity for electron accelerators

Kubo, Takayuki*; Saeki, Takayuki*; Cenni, E.*; Fujisawa, Hiroshi*; Iwashita, Yoshihisa*; Tongu, Hiromu*; Hajima, Ryoichi; Sawamura, Masaru

Proceedings of 27th International Linear Accelerator Conference (LINAC 2014) (Internet), p.1030 - 1033, 2014/12

A 325 MHz superconducting spoke cavity for the electron acceleration is under development to realize a compact industrial-use X-ray source with the laser-Compton scattering. Optimum designs of the spoke cavity have been searched by using the genetic algorithm, and multipactor simulations are currently in progress to finalize the detailed design. In parallel to the design-optimization efforts, studies toward fabrication processes are also being carried out. In this paper, progresses made so far and a current situation are briefly reviewed.

Journal Articles

Status of ERL superconducting spoke cavity development

Sawamura, Masaru; Nagai, Ryoji; Nishimori, Nobuyuki; Hajima, Ryoichi; Iwashita, Yoshihisa*; Fujisawa, Hiroshi*; Tongu, Hiromu*; Kubo, Takayuki*; Saeki, Takayuki*

Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.618 - 620, 2014/10

no abstracts in English

Journal Articles

Development of superconducting spoke cavity for laser Compton scattered photon sources

Sawamura, Masaru; Hajima, Ryoichi; Nagai, Ryoji; Kubo, Takayuki*; Fujisawa, Hiroshi*; Iwashita, Yoshihisa*; Tongu, Hiromu*

Proceedings of 5th International Particle Accelerator Conference (IPAC '14) (Internet), p.1946 - 1948, 2014/07

We have launched a 5-year research program to develop superconducting spoke cavity for laser Compton scattered (LCS) photon sources. For realizing a wide use of LCS X-ray and $$gamma$$-ray sources in academic and industrial applications, we adopt 325-MHz super-conducting spoke cavity to electron beam drivers. The spoke cavity, originally invented for ion and proton acceleration, can be used for electron accelerators, in which we can make best use of features of spoke cavity: relative compactness in comparison with a TM cavity of the same frequency, robustness with respect to manufacturing inaccuracy due to its strong cell-to-cell coupling, couplers on outer conductor for the better packing in a linac, and so on. In this paper, we present our research plan and results of cavity shape optimization.

Journal Articles

Multipactor simulation on superconducting spoke cavity for laser Compton scattered photon sources

Iwashita, Yoshihisa*; Fujisawa, Hiroshi*; Tongu, Hiromu*; Hajima, Ryoichi; Nagai, Ryoji; Sawamura, Masaru; Kubo, Takayuki*

Proceedings of 5th International Particle Accelerator Conference (IPAC '14) (Internet), p.2543 - 2545, 2014/07

Superconducting spoke cavities for laser Compton scattered (LCS) photon sources is under development. The operating frequency is 325-MHz to accelerate electron beam for the LCS sources, where the size of the spoke cavity is less than an elliptical cavities with the same frequency. Because of the complicated shape of the cavity, it may be suffered from a strong multipactor effect. Some trial of multipactor analysis is described.

Journal Articles

Proposal of superconducting spoke cavity development for electron accelerators

Hajima, Ryoichi; Sawamura, Masaru; Iwashita, Yoshihisa*

Kasokuki, 10(4), p.238 - 245, 2014/01

We have launched a development program of superconducting spoke cavities for electron beam acceleration. While the spoke cavity was originally invented for proton and ion acceleration for a velocity range of $$beta$$ = 0.3-0.5, it can be also applicable to electron acceleration, $$beta$$ = 1, with a minor modification. We plan to design and fabricate superconducting spoke cavities for laser Compton scattered photon sources, where the spoke cavities are expected to realize a compact industrial-use X-ray source with a reasonable cost and easy operation. In this paper, we describe features of the spoke cavity and results of cavity shape optimization for electromagnetic and mechanical properties.

Journal Articles

A Novel technique for monitoring the reproducibility of laser tape-target interactions using an X-ray pinhole camera

Ogura, Koichi; Fukumi, Atsushi*; Li, Z.*; Orimo, Satoshi; Sagisaka, Akito; Nishiuchi, Mamiko; Kado, Masataka; Mori, Michiaki; Yogo, Akifumi; Hayashi, Yukio; et al.

Journal of the Vacuum Society of Japan, 52(10), p.570 - 574, 2009/10

For accurate control of relativistic laser-plasma interaction under the repetitive operation, we have to measure and control the laser irradiation conditions such as laser parameters, the target shooting accuracy and so on as well as measuring proton parameter on each laser shot. The displacement of the laser shooting position on a tape target, that are used in the high energy proton generation using an ultra-short Ti:sapphire laser system, is measured by observing an X-ray image from laser plasma with an X-ray pinhole camera for each laser shot. The displacement of the shooting position on the target is about 20micron and the accuracy of the target positioning is within 20micron which is small enough for present laser focusing optics with an F number of 3.6 (f=179mm). The technique contributes to accurate control of a repetitive laser driven proton accelerators.

66 (Records 1-20 displayed on this page)