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Journal Articles

The $$^{59}$$Fe(n,$$gamma$$)$$^{60}$$Fe cross section from the surrogate ratio method and its effect on the $$^{60}$$Fe nucleosynthesis

Yan, S. Q.*; Li, X. Y.*; Nishio, Katsuhisa; Lugaro, M.*; Li, Z. H.*; Makii, Hiroyuki; Pignatari, M.*; Wang, Y. B.*; Orlandi, R.; Hirose, Kentaro; et al.

Astrophysical Journal, 919(2), p.84_1 - 84_7, 2021/10

 Times Cited Count:0

Journal Articles

Multiple magnetic bilayers and unconventional criticality without frustration in BaCuSi$$_2$$O$$_6$$

Allenspach, S.*; Biffin, A.*; Stuhr, U.*; Tucker, G. S.*; Kawamura, Seiko; Kofu, Maiko; Voneshen, D. J.*; Boehm, M.*; Normand, B.*; Laflorencie, N.*; et al.

Physical Review Letters, 124(17), p.177205_1 - 177205_7, 2020/05

 Times Cited Count:5 Percentile:77.76(Physics, Multidisciplinary)

Journal Articles

The $$^{95}$$Zr($$n, gamma$$)$$^{96}$$Zr cross section from the surrogate ratio method and its effect on $$s$$-process nucleosynthesis

Yan, S. Q.*; Li, Z. H.*; Wang, Y. B.*; Nishio, Katsuhisa; Lugaro, M.*; Karakas, A. I.*; Makii, Hiroyuki; Mohr, P.*; Su, J.*; Li, Y. J.*; et al.

Astrophysical Journal, 848(2), p.98_1 - 98_8, 2017/10

 Times Cited Count:3 Percentile:13.13(Astronomy & Astrophysics)

Journal Articles

Magnon polarons in the spin Seebeck effect

Kikkawa, Takashi*; Shen, K.*; Flebus, B.*; Duine, R. A.*; Uchida, Kenichi*; Qiu, Z.*; Bauer, G. E. W.*; Saito, Eiji

Physical Review Letters, 117(20), p.207203_1 - 207203_6, 2016/11

 Times Cited Count:87 Percentile:96.97(Physics, Multidisciplinary)

Journal Articles

Examination of the surrogate ratio method for the determination of the $$^{93}$$Zr(n,$$gamma$$)$$^{94}$$Zr cross section with $$^{90,92}$$Zr($$^{18}$$O,$$^{16}$$O)$$^{92,94}$$Zr reactions

Yan, S. Q.*; Li, Z. H.*; Wang, Y. B.*; Nishio, Katsuhisa; Makii, Hiroyuki; Su, J.*; Li, Y. J.*; Nishinaka, Ichiro; Hirose, Kentaro; Han, Y. L.*; et al.

Physical Review C, 94(1), p.015804_1 - 015804_5, 2016/07

 Times Cited Count:5 Percentile:40.15(Physics, Nuclear)

Journal Articles

Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids

Althammer, M.*; Meyer, S.*; Nakayama, Hiroyasu*; Schreier, M.*; Altmannshofer, S.*; Weiler, M.*; Huebl, H.*; Gepr$"a$gs, S.*; Opel, M.*; Gross, R.*; et al.

Physical Review B, 87(22), p.224401_1 - 224401_15, 2013/06

 Times Cited Count:330 Percentile:99.39(Materials Science, Multidisciplinary)

We experimentally investigate and quantitatively analyze the spin Hall magnetoresistance (SMR) effect in ferromagnetic insulator (FI)/Pt and FI/nonmagnetic metal/Pt hybrid structures. For the FI, we use either YIG, nickel ferrite, or magnetite and for the nonmagnet, Cu or Au. The SMR is theoretically ascribed to the combined action of spin Hall and inverse spin Hall effect in the Pt top layer. It therefore should characteristically depend upon the orientation of the magnetization in the adjacent ferromagnet and prevail even if an additional, nonmagnetic metal layer is inserted between Pt and the ferromagnet. Our experimental data corroborate these theoretical conjectures. Using the SMR theory to analyze our data, we extract the spin Hall angle and the spin diffusion length in Pt. For a spin-mixing conductance of $$4times 10^{14}Omega^{-1}$$m$$^{-2}$$, we obtain a spin Hall angle of 0.11 $$pm$$ 0.08 and a spin diffusion length of (1.5 $$pm$$ 0.5) nm for Pt in our samples.

Journal Articles

Signature splitting inversion and backbending in $$^{80}$$Rb

He, C.*; Shen, S.*; Wen, S.*; Zhu, L.*; Wu, X.*; Li, G.*; Zhao, Y.*; Yan, Y.*; Bai, Z.*; Wu, Y.*; et al.

Physical Review C, 87(3), p.034320_1 - 034320_10, 2013/03

 Times Cited Count:5 Percentile:42.24(Physics, Nuclear)

Journal Articles

Thermally driven spin and charge currents in thin NiFe$$_{2}$$O$$_{4}$$/Pt films

Meier, D.*; Kuschel, T.*; Shen, L.*; Gupta, A.*; Kikkawa, Takashi*; Uchida, Kenichi*; Saito, Eiji; Schmalhorst, J.-M.*; Reiss, G.*

Physical Review B, 87(5), p.054421_1 - 054421_5, 2013/02

 Times Cited Count:96 Percentile:95.94(Materials Science, Multidisciplinary)

Journal Articles

From a single-band metal to a high-temperature superconductor via two thermal phase transitions

He, R.-H.*; Hashimoto, Makoto*; Karapetyan, H.*; Koralek, J. D.*; Hinton, J. P.*; Testaud, J. P.*; Nathan, V.*; Yoshida, Yoshiyuki*; Yao, H.*; Tanaka, Kiyohisa*; et al.

Science, 331(6024), p.1579 - 1583, 2011/03

 Times Cited Count:252 Percentile:98.82(Multidisciplinary Sciences)

The nature of the pseudogap phase of cuprate high-temperature superconductors is a major unsolved problem in condensed matter physics. We studied the commencement of the pseudogap state at temperature $$T^*$$ using three different techniques (angle-resolved photoemission spectroscopy, polar Kerr effect, and time-resolved reflectivity) on the same optimally doped Bi2201 crystals. We observed the coincident, abrupt onset at $$T^*$$ of a particle-hole asymmetric antinodal gap in the electronic spectrum, a Kerr rotation in the reflected light polarization, and a change in the ultrafast relaxational dynamics, consistent with a phase transition. Upon further cooling, spectroscopic signatures of superconductivity begin to grow close to the superconducting transition temperature ($$T_c$$), entangled in an energy-momentum dependent manner with the preexisting pseudogap features, ushering in a ground state with coexisting orders.

Journal Articles

Unified beam control system of J-PARC linac

Sako, Hiroyuki; Allen, C. K.*; Ikeda, Hiroshi*; Shen, G.*

IEEE Transactions on Nuclear Science, 57(3), p.1528 - 1535, 2010/06

 Times Cited Count:0 Percentile:0.01(Engineering, Electrical & Electronic)

A beam control system has been developed for the J-PARC linac to achieve strict design goals of beam performance and beam loss suppression in the high-intensity H-beams. An emerging concept of unified beam control has been adopted in the system, where a unified data source, standardized control units, aunified online model, and uniform high-level application frameworks have been designed and implemented. For precise beam controls, various beam tuning algorithms have been developed and tested. Design goals of beam performance, beam stability, and beam loss suppression have been achieved in the linac.

Journal Articles

Tuning of RF amplitude and phase for the separate-type drift tube linac in J-PARC

Shen, G.; Ikegami, Masanori*

Nuclear Instruments and Methods in Physics Research A, 598(2), p.361 - 371, 2009/01

 Times Cited Count:6 Percentile:45.46(Instruments & Instrumentation)

In the beam commissioning of J-PARC linac, the RF set-point has been determined for 15 SDTL modules based on a beam experiment. In the beam-based tuning, a phase scan method is employed with the concept of phase signature matching. The obtained phase scan curve shows an excellent agreement with that from a numerical model, and the tuning accuracy of 1 deg in phase and 1 % in amplitude is achieved with a sufficient margin. In the phase scan tuning, the range of phase scanning is restricted to two critical regions to avoid the unfavorable influence from debunching. An analogous scheme has successfully been applied to the RF set-point tuning for bunchers and debunchers. The tuning goals for these cavities are set to 5 deg in phase and 5 % in amplitude. The tuning goal is expected to be met for those cavities, while the debuncher tuning is to be confirmed by directly monitoring the debuncher functions.

Journal Articles

Performance of the control system for the J-PARC LINAC

Yoshikawa, Hiroshi; Suzuki, Takahiro; Sakaki, Hironao; Ito, Yuichi; Kato, Yuko; Kawase, Masato; Sako, Hiroyuki; Shen, G.; Takahashi, Hiroki; Fukuta, Shimpei; et al.

Proceedings of 24th International Linear Accelerator Conference (LINAC 2008) (CD-ROM), p.52 - 54, 2009/00

LINAC of J-PARC began to operate in November, 2006, and a achieved an initial performance in January, 2007. Afterwards, the beam supply to RCS begins, and it is operating extremely with stability up to now. Here, the evaluation for comparison of the design and realities of architecture and performance of the LINAC control system are shown. Especially, the conceptual idea of function arrangement in the hierarchy of the control system architecture is shown. Now, the LINAC control system is in the second phase for the high power beam and reducing the beam loss, and the analysis of the system response identification for the high precision beam control is started.

Journal Articles

Tuning of RF amplitude and phase for the drift tube linac in J-PARC

Shen, G.; Ikegami, Masanori*

Chinese Physics C, 33(7), p.577 - 582, 2008/09

 Times Cited Count:4 Percentile:35.66(Physics, Nuclear)

In the beam commissioning of J-PARC linac, the RF set-point tuning has been performed based on a phase scan method. In the tuning of DTL2 and DTL3, the phase scan curves show a remarkable agreement with the numerical model. In the DTL1 tuning, however, the phase scan curves show a notable discrepancy from the numerical model especially with the RF set-points far from its design value. A three-dimensional particle simulation has been conducted with IMPACT, and the generation of the low energy component and the severe filamentation are identified as the main sources of the observed discrepancy. To circumvent this difficulty, we have adopted two phase scan curves as the reference restricting the parameter range for the phase scan. The reference curves and scanning phase range are carefully determined to avoid the influence from the filamentation. The tuning goal of 1$$^{circ}$$ in phase and 1% in amplitude is satisfied for DTL1 with the two-reference scheme.

Journal Articles

Beam energy measurement at J-PARC linac

Sato, Susumu; Igarashi, Zenei*; Tomisawa, Tetsuo; Miura, Akihiko; Ueno, Akira; Sako, Hiroyuki; Morishita, Takatoshi; Kondo, Yasuhiro; Shen, G.; Akikawa, Hisashi*; et al.

Proceedings of 5th Annual Meeting of Particle Accelerator Society of Japan and 33rd Linear Accelerator Meeting in Japan (CD-ROM), p.500 - 502, 2008/00

no abstracts in English

Journal Articles

Beam commissioning software and database for J-PARC LINAC

Sako, Hiroyuki; Sakaki, Hironao; Shen, G.; Takahashi, Hiroki; Yoshikawa, Hiroshi; Ikeda, Hiroshi*; Allen, C. K.*

Proceedings of International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS '07) (CD-ROM), p.698 - 700, 2007/10

A beam commissioning software system based on a relational database has been developed for J-PARC LINAC. A high level application framework with SAD script interperter, JCE was developed in Java. JCE and XAL developed in SNS has been used to write commissioning applications with functions of device control, online modeling and data analysis. A commissioning database system has been developed a base data source for commissioning tools.

Journal Articles

Current status of the control system for J-PARC accelerator complex

Yoshikawa, Hiroshi; Sakaki, Hironao; Sako, Hiroyuki; Takahashi, Hiroki; Shen, G.; Kato, Yuko; Ito, Yuichi; Ikeda, Hiroshi*; Ishiyama, Tatsuya*; Tsuchiya, Hitoshi*; et al.

Proceedings of International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS '07) (CD-ROM), p.62 - 64, 2007/10

J-PARC is a large scale facility of the proton accelerators for the multi-purpose of scientific researches in Japan. This facility consists of three accelerators and three experimental stations. Now, J-PARC is under construction, and LINAC is operated for one year, 3GeV synchrotron has just started the commissioning in this October the 1st. The completion of this facility will be next summer. The control system of accelerators established fundamental performance for the initial commissioning. The most important requirement to the control system of this facility is to minimize the activation of accelerator devices. In this paper, we show that the performances of each layer of this control system have been achieved in the initial stage.

Journal Articles

Profile measurement and transverse matching in J-PARC linac

Akikawa, Hisashi*; Igarashi, Zenei*; Ikegami, Masanori*; Lee, S.*; Sato, Susumu; Shen, G.; Tomisawa, Tetsuo; Ueno, Akira

Proceedings of 2007 Particle Accelerator Conference (PAC '07) (Internet), p.1472 - 1474, 2007/08

Beam commissioning of J-PARC linac has been performed since November 2006. We have wire scanners in order to measure beam profile and perform transverse matching. Four wire scanners are installed at each matching section. We report the result of measurement of beam profile and matching.

Journal Articles

Beam position monitor and its calibration in J-PARC LINAC

Sato, Susumu; Tomisawa, Tetsuo; Sako, Hiroyuki; Shen, G.; Ueno, Akira; Akikawa, Hisashi*; Igarashi, Zenei*; Lee, S.*; Ikegami, Masanori*; Kamikubota, Norihiko*

Proceedings of 2007 Particle Accelerator Conference (PAC '07) (Internet), p.4072 - 4074, 2007/08

The beam commissioning of J-PARC LINAC has been started in November 2006. Beam Position Monitors (BPM's) which had been calibrated on the bench setup with a scanning wire, take beam-based-calibration method in order to enable the beam to pass at the centre of a quadrupole magnet (Q-magnet). The installed BPM's and their calibration methods are described.

Journal Articles

Transverse matching in J-PARC LINAC ccmmissioning

Sako, Hiroyuki; Shen, G.; Ueno, Akira; Okawa, Tomohiro; Akikawa, Hisashi*; Ikegami, Masanori*

Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.598 - 600, 2007/00

Transverse matching has been performed at J-PARC LINAC for matching sections at DTL-SDTL, S01A-S03B, MEBT2-ACS, and L3BT. Each matching section consists of 4 wire scanners and upstream 4 quadrupole magnets. From r.m.s. of beam profiles measured at 4 wire scanners, transverse Twiss parameters and emittance are fitted with Newton method based on an online model. Field of quadrupole magnets with matching conditions is calculated based on the model. At beam current of 5 mA and 25 mA, matching factors of within 4% were achieved.

Journal Articles

Tuning of RF amplitude and phase of J-PARC DTL and SDTL

Shen, G.; Sako, Hiroyuki; Sato, Susumu; Ikegami, Masanori*

Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.522 - 524, 2007/00

An accurate tuning has been performed for the RF amplitude and phase of J-PARC (Japan Proton Accelerator Research Complex) LINAC during the beam commissioning. The tuning has been performed using a phase-scan method for all RF cavities, including buncher, debuncher, DTL (Drift Tube LINAC), and SDTL (Separate-type DTL). An adequate set-point is determined with satisfied accuracy, which is within 1$$^{circ}$$; for phase and 1% for amplitude, by matching measured absolute beam energy with those from a modeling. This paper presents detail procedures of RF tuning.

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