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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

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

Time structure of an accelerated beam using a ratio-frequency quadrupole linac with direct plasma injection scheme

Kashiwagi, Hirotsugu; Okamura, Masahiro*; Jameson, R. A.*; Hattori, Toshiyuki*; Hayashizaki, Noriyosu*

Review of Scientific Instruments, 81(2), p.02B724_1 - 02B724_4, 2010/02

 Times Cited Count:2 Percentile:14.37(Instruments & Instrumentation)

Journal Articles

Acceleration of high current fully stripped carbon ion beam by direct injection scheme

Kashiwagi, Hirotsugu; Fukuda, Mitsuhiro; Okamura, Masahiro*; Jameson, R. A.*; Hattori, Toshiyuki*; Hayashizaki, Noriyosu*; Sakakibara, Kazuhiko*; Takano, Jumpei*; Yamamoto, Kazuo*; Iwata, Yoshiyuki*; et al.

Review of Scientific Instruments, 77(3), p.03B305_1 - 03B305_4, 2006/03

 Times Cited Count:12 Percentile:54.47(Instruments & Instrumentation)

Acceleration of a 17mA 100keV/u C$$^{6+}$$ ion beam has been successfully achieved with an RFQ linac by means of "Direct injection scheme". The Direct injection scheme is a new scheme for injecting an ion beam from a laser ion source to the RFQ linac without a low energy beam transport line to avoid a beam loss due to the space charge effect. The high current C$$^{6+}$$ beam is required for single turn injection to a synchrotron to reduce the size of synchrotron magnets. The high current C$$^{6+}$$ beam produced by an ion source with a Nd-YAG laser was injected to the RFQ linac by the Direct injection scheme. It has been proved experimentally that the fully-stripped carbon ion beam with a current more than 10mA can be accelerated by the RFQ linac.

Journal Articles

High current carbon beam production with direct plasma injection scheme

Okamura, Masahiro*; Kashiwagi, Hirotsugu; Sakakibara, Kazuhiko*; Takano, Jumpei*; Hattori, Toshiyuki*; Hayashizaki, Noriyosu*; Jameson, R. A.*; Yamamoto, Kazuo*

Review of Scientific Instruments, 77(3), p.03B303_1 - 03B303_3, 2006/03

 Times Cited Count:10 Percentile:49.28(Instruments & Instrumentation)

We have been studying a new heavy-ion production technique called "direct plasma injection scheme", DPIS, since 2000. A new radio frequency quadrupole "RFQ" designed especially for the DPIS was commissioned in 2004 and very intense carbon beam was successfully obtained, reaching more than 60 mA accelerated current from the RFQ. Most of the contents of the accelerated beam was carbon 4+ as verified by beam analysis.

Journal Articles

Acceleration of high current and highly charged carbon beam using direct injection scheme

Kashiwagi, Hirotsugu; Okamura, Masahiro*; Jameson, R. A.*; Hattori, Toshiyuki*; Hayashizaki, Noriyosu*; Sakakibara, Kazuhiko*; Takano, Jumpei*; Yamamoto, Kazuo*; Iwata, Yoshiyuki*; Fujimoto, Tetsuya*

Proceedings of 2nd Annual Meeting of Particle Accelerator Society of Japan and 30th Linear Accelerator Meeting in Japan, p.182 - 184, 2005/07

The carbon beam from a Nd-YAG laser ion source was accelerated successfully by an RFQ linac using Direct injection scheme. The "Direct injection scheme" is the way to inject an ion beam to the RFQ linac without a low energy beam transport line to avoid space charge effect due to a high intensity beam from the laser ion source. About 30mA of a carbon beam was detected by a faraday cup just behind the RFQ linac.

Journal Articles

R&D status for J-PARC ACS

Ao, Hiroyuki; Ueno, Akira; Morishita, Takatoshi; Hasegawa, Kazuo; Yamazaki, Yoshishige; Ikegami, Masanori*; Hayashizaki, Noriyosu*

Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.323 - 325, 2004/08

no abstracts in English

Journal Articles

Cold-model tests and fabrication status for J-PARC ACS

Ao, Hiroyuki; Akikawa, Hisashi; Ueno, Akira; Hasegawa, Kazuo; Yamazaki, Yoshishige; Ikegami, Masanori*; Noguchi, Shuichi*; Hayashizaki, Noriyosu*; Paramonov, V.*

Proceedings of 22nd International Linear Accelerator Conference (LINAC 2004), p.75 - 77, 2004/00

The J-PARC (Japan Proton Accelerator Research Complex) LINAC will be commissioned with energy of 181-MeV using 50-keV ion source, 3-MeV RFQ, 50-MeV DTL and 181-MeV SDTL (Separated DTL) on September 2006. It is planed to be upgraded by using a 400-MeV ACS (Annular Coupled Structure), which is a high-beta structure most suitable for the J-PARC, in a few years from the commissioning. The first ACS type cavity, which will be used as the first buncher between the SDTL and the ACS, is under fabrication. Detailed design and tuning procedure of ACS cavities has been studied with RF simulation analysis and cold-model measurements. The results of cold-model measurements, fabrication status, and related development items are described in this paper.

Journal Articles

Measurement of aluminum models of J-PARC ACS

Akikawa, Hisashi; Ao, Hiroyuki; Hayashizaki, Noriyosu*

Proceedings of 28th Linear Accelerator Meeting in Japan, p.242 - 243, 2003/08

no abstracts in English

Journal Articles

Development of ACS accelerating tank for J-PARC

Hayashizaki, Noriyosu*; Ao, Hiroyuki; Akikawa, Hisashi; Hasegawa, Kazuo; Yamazaki, Yoshishige; Ikegami, Masanori*

Proceedings of 28th Linear Accelerator Meeting in Japan, p.75 - 77, 2003/08

no abstracts in English

Journal Articles

Present status of ACS cavity RF measurements

Ao, Hiroyuki; Akikawa, Hisashi; Hayashizaki, Noriyosu*

Dai-14-Kai Kasokuki Kagaku Kenkyu Happyokai Hokokushu, p.365 - 367, 2003/00

The first J-PARC ACS cavity is under fabrication. Aluminum and OFC test cells were fabricated and tested for RF properties. This paper discusses the RF measurement setup, comparing the measurements and analyses, and the outlook for the next step.

Journal Articles

Cold-model tests of an annular coupled structure for upgrade of a J-PARC Linac

Ao, Hiroyuki; Hayashizaki, Noriyosu*; Paramonov, V.*

Proceedings of 2003 Particle Accelerator Conference (PAC 2003) (CD-ROM), p.2826 - 2828, 2003/00

An Annular Coupled Structure (ACS) has been developed for upgrade of a J-PARC (Japan Proton Accelerator Research Complex) linac from 180 MeV to 400 MeV. Although install area is prepared for the ACS cavities at an initial construction, it will be used as a beam-transport line temporarily. Aluminum and copper models were fabricated for RF properties confirmation based on an initial design, and for final optimization. RF measurement procedure of the ACS structure was also studied thorough the R&D process. Many items should be considered for mass production; schedule, handling parts, utilities, and so on. The measurement results of models and some fabrication status are presented.

Journal Articles

Power-handling capability of the annular coupled structure linac for the JAERI/KEK joint project

Yamazaki, Yoshishige; Hayashizaki, Noriyosu*; Paramonov, V.*

Proceedings of 21st International Linac Conference, p.752 - 754, 2003/00

The power-handling capability is the critical issue for a high intensity proton linac of normal-conducting coupled-cavity type. In the JAERI/KEK Joint Project, a coupled-cavity linac with the Annular Coupled Structure (ACS) has been developed in order to operate with 3 % duty factor. The ACS accelerating module consists of two ACS tanks and one bridge coupler. The cooling water circuits in the ACS cells ensure the effective and uniform cooling, stabilizing the deviation of cell frequencies. Some of excited cells in the bridge coupler are equipped with fast movable tuners to tune the cavity to the operating frequency. The results of thermal and structural analysis are presented, together with the RF parameter analysis, for different linac regimes. For the adopted ACS module design, the results of the analyses suggest that the operation with the heat loading of up to 90 kW/m is possible, which is corresponding to the 15 % duty factor operation.

Journal Articles

The Complete 3-D coupled RF-thermal-structural-RF analysis procedure for a normal conducting accelerating structure for high intensity hadron linac

Joshi, S. C.*; Paramonov, V.*; Skassyrskaya, A.*; Hayashizaki, Noriyosu*; Ikegami, Masanori*; Yamazaki, Yoshishige

Proceedings of 21st International Linac Conference, p.216 - 218, 2003/00

The normal conducting coupled-cavity linac with the Annular Coupled Structure (ACS) is adopted for 190-400 MeV part of high intensity proton linac for the JAERI/KEK Joint Project. The operating frequency is 972 MHz and the 23 modules will be constructed. The basic configuration is based on that investigated for L-band (1296 MHz) in the previous Japan Hadron Project research. However, the structure design is revised and optimized in order to meet requirements of reliability, operation efficiency and cost reduction for the newly proposed Joint Project. As the results of development, the transverse dimensions of the ACS tank are reduced sufficiently with the improvement in RF characteristics. The structure segmentation and essential points of the design are described.

28 (Records 1-20 displayed on this page)