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Journal Articles

Development of next-generation LLRF control system for J-PARC rapid cycling synchrotron

Tamura, Fumihiko; Sugiyama, Yasuyuki*; Yoshii, Masahito*; Ryoshi, Masatsugu*

IEEE Transactions on Nuclear Science, 66(7), p.1242 - 1248, 2019/07

The LLRF control system for the rapid cycling synchrotron of the J-PARC started its operation in 2007. The key functions of the LLRF control system are the dual harmonic auto voltage control and the multiharmonic rf feedforward to compensate the beam loading in the MA cavity caused by high intensity beams. The system has been working well without major problems for more than ten years. However, the old FPGAs are discontinued and not supported by the current development environment. It will be difficult to maintain the system in near future. Thus, we are planning to replace the existing VME-based LLRF control system with a new MicroTCA.4 based system. In this presentation, we present the configuration of the system under development, the implemented functions, and preliminary test results.

Journal Articles

Development of a radiological characterization submersible ROV for use at Fukushima Daiichi

Nancekievill, M.*; Jones, A. R.*; Joyce, M. J.*; Lennox, B.*; Watson, S.*; Katakura, Junichi*; Okumura, Keisuke; Kamada, So*; Kato, Michio*; Nishimura, Kazuya*

IEEE Transactions on Nuclear Science, 65(9), p.2565 - 2572, 2018/09

 Percentile:100(Engineering, Electrical & Electronic)

In order to contribute to the development of technology to search fuel debris submerged in water inside the primary containment vessel of the Fukushima Daiichi Nuclear Power Station, we are developing a remotely operated vehicle (ROV) system equipped with a compact radiation detector and sonar. A cerium bromide (CeBr$$_{3}$$) scintillator detector for dose rate monitoring and $$gamma$$ ray spectroscopy was integrated into ROV and experimentally validated with a $$^{137}$$Cs source, both in the conditions of laboratory and submerged. In addition, the ROV combined with the IMAGENEX 831L sonar could characterize the shape and size of a simulated fuel debris at the bottom of the water pool facility.

Journal Articles

Negative and positive muon-induced single event upsets in 65-nm UTBB SOI SRAMs

Manabe, Seiya*; Watanabe, Yukinobu*; Liao, W.*; Hashimoto, Masanori*; Nakano, Keita*; Sato, Hikaru*; Kin, Tadahiro*; Abe, Shinichiro; Hamada, Koji*; Tampo, Motonobu*; et al.

IEEE Transactions on Nuclear Science, 65(8), p.1742 - 1749, 2018/08

 Percentile:100(Engineering, Electrical & Electronic)

Recently, the malfunction of microelectronics caused by secondary cosmic-ray muon is concerned as semiconductor devices become sensitive to radiation. In this study, we have performed muon irradiation testing for 65-nm ultra-thin body and thin buried oxide (UTBB-SOI) SRAMs in the Japan Proton Accelerator Research Complex (J-PARC), in order to investigate dependencies of single event upset (SEU) cross section on incident muon momentum and supply voltage. It was found that the SEU cross section by negative muon are approximately two to four times larger than those by positive muon in the momentum range from 35 MeV/c to 39 MeV/c. The supply voltage dependence of muon-induced SEU cross section was measured with the momentum of 38 MeV/c. SEU cross sections decrease with increasing supply voltage, but the decreasing of SEU cross section by negative muon is gentler than that by positive muon. Experimental data of positive and negative muon irradiation with the momentum of 38 MeV/c were analyzed by PHITS. It was clarified that the negative muon capture causes the difference between the SEU cross section by negative muon and that by positive muon.

Journal Articles

Measurement and mechanism investigation of negative and positive muon-induced upsets in 65-nm Bulk SRAMs

Liao, W.*; Hashimoto, Masanori*; Manabe, Seiya*; Watanabe, Yukinobu*; Abe, Shinichiro; Nakano, Keita*; Sato, Hikaru*; Kin, Tadahiro*; Hamada, Koji*; Tampo, Motonobu*; et al.

IEEE Transactions on Nuclear Science, 65(8), p.1734 - 1741, 2018/08

 Percentile:100(Engineering, Electrical & Electronic)

Soft error induced by secondary cosmic-ray muon is concerned since susceptibility of semiconductor device to soft error increases with the scaling of technology. In this study, we have performed irradiation tests of muons on 65-nm bulk CMOS SRAM in the Japan Proton Accelerator Research Complex (J-PARC) and measured soft error rate (SER) to investigate mechanism of muon-induced soft errors. It was found that SER by negative muon increases above 0.5 V supply voltage, although SER by positive muon increases monotonically as the supply voltage lowers. SER by negative muon also increases with forward body bias. In addition, negative muon causes large multiple cell upset (MCU) of more than 20 bits and the ratio of MCU events to all the events is 66% at 1.2V supply voltage. These tendencies indicate that parasitic bipolar action (PBA) is highly possible to contribute to SER by negative muon. Experimental data are analyzed by PHITS. It was found that negative muon can deposit larger charge than positive muon, and such events that can deposit large charge may trigger PBA.

Journal Articles

Development of radiation-resistant in-water wireless transmission system using light emitting diodes and photo diodes

Takeuchi, Tomoaki; Shibata, Hiroshi; Otsuka, Noriaki; Uehara, Toshiaki; Tsuchiya, Kunihiko; Shibagaki, Taro*; Komanome, Hirohisa*

IEEE Transactions on Nuclear Science, 63(5), p.2698 - 2702, 2016/10

 Times Cited Count:1 Percentile:76.09(Engineering, Electrical & Electronic)

In response to the lesson of the accident at the Fukushima Dai-ichi Nuclear Power Plant, we started a development of a radiation-resistant in-water wireless transmission system. In this study, capability of light emitting diodes (LED) and photo diodes (PD) as light emitting and receiving devices was researched. Results of irradiation tests of LEDs and PDs up to 1 MGy indicated a main cause of the degradation of the optical performances of the diodes was not the radiation damage at the semiconductor parts but the coloring of the resin parts. Assuming that the use of the candidate LED and PD, the PD's output current generated by the emission light of the LED at five meters away in water was estimated to be detectable intensity even considering the effects of the absorption of the light by water and the increased dark current by 1 MGy irradiation. Therefore, a radiation resistant in-water transmission system can be constructed using LEDs and PDs in principle.

Journal Articles

Investigation of single-event damages on silicon carbide (SiC) power MOSFETs

Mizuta, Eiichi*; Kuboyama, Satoshi*; Abe, Hiroshi; Iwata, Yoshiyuki*; Tamura, Takashi*

IEEE Transactions on Nuclear Science, 61(4), p.1924 - 1928, 2014/08

 Times Cited Count:23 Percentile:3.93(Engineering, Electrical & Electronic)

Journal Articles

Enhanced charge collection by single ion strike in AlGaN/GaN HEMTs

Onoda, Shinobu; Hasuike, Atsushi*; Nabeshima, Yoshiaki*; Sasaki, Hajime*; Yajima, Kotaro*; Sato, Shinichiro; Oshima, Takeshi

IEEE Transactions on Nuclear Science, 60(6), p.4446 - 4450, 2013/12

 Times Cited Count:17 Percentile:9.29(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Heavy-ion induced anomalous charge collection from 4H-SiC Schottky barrier diodes

Makino, Takahiro; Deki, Manato; Iwamoto, Naoya; Onoda, Shinobu; Hoshino, Norihiro*; Tsuchida, Hidekazu*; Hirao, Toshio*; Oshima, Takeshi

IEEE Transactions on Nuclear Science, 60(4), p.2647 - 2650, 2013/08

 Times Cited Count:4 Percentile:62.81(Engineering, Electrical & Electronic)

Heavy ion induced anomalous charge collection was observed from 4H-SiC Schottky barrier diodes. It is suggested that the incident ion range with suspect to the thickness of the epi-layer of the SBD in key to understanding these observation and the understanding mechanism.

Journal Articles

Electronic transport transition of hydrogenated amorphous silicon irradiated with self ions

Sato, Shinichiro; Oshima, Takeshi

IEEE Transactions on Nuclear Science, 60(3), p.2288 - 2299, 2013/06

 Times Cited Count:1 Percentile:84.29(Engineering, Electrical & Electronic)

Electric conductivity variations of hydrogenated amorphous silicon due to self-ion irradiation are comprehensively investigated. The anomalous enhancement of dark conductivity (DC) and photoconductivity (PC) are firstly observed due to proton irradiation, and after that both decrease with increasing the irradiation fluence. The decrease in DC and PC is ascribed to the carrier removal effect and the carrier lifetime decrease accompanied by accumulation of dangling bonds, respectively. However, further irradiation causes the loss of photoconduction and the drastic increase in DC. This indicates that the dominant conduction mechanism changes from the band transport to the hopping transport due to excessive accumulation of dangling bonds. It is concluded that the conductivity variations caused by self-ion irradiation can be systematically categorized according to the ratio of the nuclear energy deposition to the electronic energy deposition of incident ions.

Journal Articles

Applicability of redundant pairs of SOI transistors for analog circuits and their applications to phase-locked loop circuits

Makihara, Akiko*; Yokose, Tamotsu*; Tsuchiya, Yoshihisa*; Miyazaki, Yoshio*; Abe, Hiroshi; Shindo, Hiroyuki*; Ebihara, Tsukasa*; Maru, Akifumi*; Morikawa, Koichi*; Kuboyama, Satoshi*; et al.

IEEE Transactions on Nuclear Science, 60(1), p.230 - 235, 2013/02

 Times Cited Count:2 Percentile:72.96(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Spatial, LET and range dependence of enhanced charge collection by single ion strike in 4H-SiC MESFETs

Onoda, Shinobu; Makino, Takahiro; Ono, Shuichi*; Katakami, Shuji*; Arai, Manabu*; Oshima, Takeshi

IEEE Transactions on Nuclear Science, 59(4), p.742 - 748, 2012/08

 Times Cited Count:3 Percentile:64.33(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Response measurement of a Bonner sphere spectrometer for high-energy neutrons

Masuda, Akihiko*; Matsumoto, Tetsuro*; Harano, Hideki*; Nishiyama, Jun*; Iwamoto, Yosuke; Hagiwara, Masayuki*; Satoh, Daiki; Iwase, Hiroshi*; Yashima, Hiroshi*; Nakamura, Takashi*; et al.

IEEE Transactions on Nuclear Science, 59(1), p.161 - 166, 2012/02

 Times Cited Count:11 Percentile:22.82(Engineering, Electrical & Electronic)

In this study, responses of Bonner sphere spectrometer (BSS) for 245 and 388 MeV neutrons was measured at RCNP, Osaka University. The neutrons are generated in the $$^{7}$$Li(p,n) reaction and its spectra consist of a high-energy peak and a continuum down to the low energy. Therefore, the observed counts of BSS caused by the continuum need to be subtracted. Adjusting a Li target angle and a collimator position, 0 deg and 30 deg component of generated neutron are available. While the 0 deg component contains both the peak and the continuum, the 30 deg component is considered to contain only the continuum. Therefore, the response of the peak is obtained. The spectra were measured using the time-of-flight (TOF) method with a NE213 scintillator.

Journal Articles

Single-alpha-particle-induced charge transient spectroscopy of the 6H-SiC p$$^+$$n diode irradiated with high-energy electrons

Iwamoto, Naoya; Koizumi, Atsushi*; Onoda, Shinobu; Makino, Takahiro; Oshima, Takeshi; Kojima, Kazutoshi*; Koike, Shumpei*; Uchida, Kazuo*; Nozaki, Shinji*

IEEE Transactions on Nuclear Science, 58(6), p.3328 - 3332, 2011/12

 Times Cited Count:5 Percentile:50.9(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Status of development on $$^{99}$$Mo production technologies in JMTR

Inaba, Yoshitomo; Iimura, Koichi; Hosokawa, Jinsaku; Izumo, Hironobu; Hori, Naohiko; Ishitsuka, Etsuo

IEEE Transactions on Nuclear Science, 58(3), p.1151 - 1158, 2011/06

 Times Cited Count:3 Percentile:66.23(Engineering, Electrical & Electronic)

The Japan Materials Testing Reactor (JMTR) is now under refurbishment, and the operation of the new JMTR will start in FY 2011. The new JMTR has a plan to produce $$^{99}$$Mo, which is the parent nuclide of $$^{99m}$$Tc, and two $$^{99}$$Mo production technologies have been developed: one is a solid irradiation method, and the other is a solution irradiation method. In this paper, the present status of the development on the $$^{99}$$Mo production technologies with the solid and solution irradiation methods was described. In the solid irradiation method, it was found that JMTR can provide about 20% of the $$^{99}$$Mo imported into Japan. In the solution irradiation method, the fundamental characteristics of the aqueous molybdate solutions selected as candidates for the irradiation target were cleared by the $$gamma$$-ray irradiation test.

Journal Articles

Imaging of carbon translocation to fruit using carbon-11-labeled carbon dioxide and positron emission tomography

Kawachi, Naoki; Kikuchi, Kaori*; Suzui, Nobuo; Ishii, Satomi; Fujimaki, Shu; Ishioka, Noriko; Watabe, Hiroshi*

IEEE Transactions on Nuclear Science, 58(2), p.395 - 399, 2011/04

 Times Cited Count:7 Percentile:39.29(Engineering, Electrical & Electronic)

Journal Articles

Transient analysis of an extended drift region in a 6H-SiC diode formed by a single alpha particle strike and its contribution to the increased charge collection

Iwamoto, Naoya; Onoda, Shinobu; Makino, Takahiro; Oshima, Takeshi; Kojima, Kazutoshi*; Koizumi, Atsushi*; Uchida, Kazuo*; Nozaki, Shinji*

IEEE Transactions on Nuclear Science, 58(1), p.305 - 313, 2011/02

 Times Cited Count:7 Percentile:39.29(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Charge enhancement effects in 6H-SiC MOSFETs induced by heavy ion strike

Onoda, Shinobu; Makino, Takahiro; Iwamoto, Naoya*; Vizkelethy, G.*; Kojima, Kazutoshi*; Nozaki, Shinji*; Oshima, Takeshi

IEEE Transactions on Nuclear Science, 57(6), p.3373 - 3379, 2010/12

no abstracts in English

Journal Articles

Characterization of microdose damage caused by single heavy ion observed in trench type power MOSFETs

Kuboyama, Satoshi*; Maru, Akifumi*; Ikeda, Naomi*; Hirao, Toshio; Tamura, Takashi*

IEEE Transactions on Nuclear Science, 57(6), p.3257 - 3261, 2010/12

 Times Cited Count:12 Percentile:26.04(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

DICE-based flip-flop with SET pulse discriminator on a 90 nm bulk CMOS process

Maru, Akifumi*; Shindo, Hiroyuki*; Ebihara, Tsukasa*; Makihara, Akiko*; Hirao, Toshio; Kuboyama, Satoshi*

IEEE Transactions on Nuclear Science, 57(6), p.3602 - 3608, 2010/12

 Times Cited Count:8 Percentile:39.88(Engineering, Electrical & Electronic)

no abstracts in English

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

 Percentile:100(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.

83 (Records 1-20 displayed on this page)