Explanipedia

Intense vanadium ion beam production for super-heavy element research experiments Open

Y. Higurashi, G. Q. Saquilayan, J. Ohnishi, T. Nagatomo · 2024

Long-term production of an intense 51 V 13+ ion beam was imperative for synthesizing a new element (Z=119) at RIKEN. We systematically measured the beam intensity as a function of microwave power and material consumption rate for effective…

Beam Emittance Growth of Highly Charged Ion Beams from the RIKEN 28-GHz SC-ECRIS Open

G. Q. Saquilayan, T. Nagatomo, Y. Higurashi, J. Ohnishi, Takatoshi Nakagawa , et al. · 2024

Different factors that affect the beam emittance of highly charged ions extracted from the RIKEN 28-GHz superconducting ECR ion source have been investigated. Since the ion source parameters, space charge effects and various beamline compo…

Space-Charge Effects on Transverse Emittance in the Extraction Region of the RIKEN 28-GHz ECRIS Open

T. Nagatomo, Keita Kamakura, Yasuyuki MORITA, G. Q. Saquilayan, Y. Higurashi , et al. · 2024

To confirm the significance of space-charge effects (SCEs) on the emittance growth in the “extraction region” of the RIKEN 28-GHz electron-cyclotron-resonance ion source (ECRIS), we reconstructed the phase-space distribution of argon (Ar) …

Development of an Image Analysis Method for Pepperpot Emittance Monitors Open

Yasuyuki MORITA, T. Nagatomo, Yutaka Nakashima · 2024

At the RIKEN Nishina Center for Accelerator-Based Science, we developed a pepperpot emittance monitor using a method that can change the distance between the pepperpot mask and the screen. The accuracy can be improved by correctly identify…

Producing intense uranium ion beam for RIKEN RI beam factory Open

Y. Higurashi, G. Q. Saquilayan, J. Ohnishi, Hiromitsu Haba, T. Nagatomo · 2024

Intense highly charged uranium (U) ion beams were produced using RIKEN 28 GHz superconducting electron cyclotron resonance (ECR) ion source in a high-temperature oven (HTO). We used a double-oven system to ensure ample vapor supply. Moreov…

Recent Progress in RIKEN RI Beam Factory Open

O. Kamigaito, Tomoyuki Dantsuka, Masaki Fujimaki, Nobuhisa Fukunishi, Hiroo Hasebe , et al. · 2020

Recent efforts at the RIKEN RI Beam Factory (RIBF) are aimed at increasing the beam intensity for very heavy ions such as xenon and uranium. This paper presents upgrade programs carried out over the past few years, including modifications …

Present status of and recent developments at RIKEN RI beam factory Open

H. Okuno, Tomoyuki Dantsuka, Makoto Fujimaki, Nobuhisa Fukunishi, H. Hasebe , et al. · 2020

The Radioactive Isotope Beam Factory (RIBF) is a cyclotron-based accelerator facility that is used for nuclear science studies and was completed at the end of 2006. RIBF can produce the most intense RI beams using fragmentation or fission …

学習ジャーナルによる英語授業の振り返りの検証 : 自己効力感・メタ認知の観点から Open

千勢笠井, 隆志長友, Chise Kasai, タカシナガトモ, Chise Kasai , et al. · 2019

New 28-GHz Superconducting ECR Ion Source for Synthesizing New Super Heavy Elements of Z > 118 Open

T. Nagatomo, Masaki Fujimaki, Nobuhisa Fukunishi, Y. Higurashi, O. Kamigaito , et al. · 2019

To increase the intensity of heavy-ion beams such as V and Cr for synthesizing new super heavy elements (SHE), we started to construct a new 28-GHz Superconducting ECR ion source (SC-ECRIS) for RIKEN Linear Accelerator (RILAC) in 2017. The…

Present Status of and Recent Developments at RIKEN RI Beam Factory Open

H. Okuno, Tomoyuki Dantsuka, Masaki Fujimaki, Nobuhisa Fukunishi, Hiroo Hasebe , et al. · 2019

Present status and recent developments of RIKEN RI Beam Factory will be presented.

Residual gas effect in LEBT on transverse emittance of multiply charged heavy ion beams extracted from ECR ion source Open

T. Nagatomo, Vasilis Tzoganis, J. P. Mira, T. Nakagawa, O. Kamigaito · 2018

By utilizing a pepper-pot emittance meter, we have measured the four-dimensional transverse phase-space distribution for multiply charged argon ions generated by an 18-GHz superconducting electron cyclotron resonance ion source (18-GHz SC-…

Operational Experience and Upgrade Plans of the RIBF Accelerator Complex Open

H. Okuno, Tomoyuki Dantsuka, Masaki Fujimaki, Nobuhisa Fukunishi, Hiroo Hasebe , et al. · 2017

The Radioactive Isotope Beam Factory (RIBF) is the cyclotron based accelerator facility for nuclear science, completed in the end of 2006. Now RIBF can provide the most intense RI beams. Continuous efforts since the first beam has increase…

Four-Dimension Transverse Phase-Space Distribution Measured by a Pepper-Pot Emittance Meter Open

T. Nagatomo, T. Nakagawa, Vasilis Tzoganis, O. Kamigaito, M. Kase , et al. · 2016

Four-dimensional (4-D) transverse emittance of the highly charged heavy ion beam extracted from ECR ion source is invariant under linear 4-D symplectic operation. Thus, it is essential quantity to improve the beam quality. Measurement of t…

Status Report on the Operation of the RIBF Ring Cyclotrons Open

Kazutaka Ozeki, Tomoyuki Dantsuka, Masaki Fujimaki, T. Fujinawa, Nobuhisa Fukunishi , et al. · 2016

Operational status of four ring cyclotrons (RRC, fRC, IRC, SRC) from August 2014 to July 2015 is reported. We are engaging in the improvements and adjustments for increasing beam intensities year after year, and maintenances for the stabil…

Status Report of the Operation of the RIKEN AVF Cyclotron Open

K. Suda, Masaki Fujimaki, Nobuhisa Fukunishi, Seiji Fukuzawa, Makoto Hamanaka , et al. · 2016

The RIKEN AVF cyclotron was commissioned in 1989. Since then, it has been operated as an injector for the RIKEN ring cyclotron. The AVF cyclotron also provides low energy ion beams for the Radio-Isotope Beam separator (CRIB) of the Center …

Emittance Measurements and Operation Optimization for ECR Ion Sources Open

Vasilis Tzoganis, O. Kamigaito, T. Nagatomo, T. Nakagawa, Carsten Welsch · 2016

Electron Cyclotron Resonance (ECR) ion sources supply a broad range of ions for post acceleration in cyclotrons. Here, an effort to improve the beam transfer from RIKEN's 18 GHz ECR ion source to the Low Energy Beam Transfer (LEBT) line an…

Development of an Online Emittance Monitor for Low Energy Heavy Ion Beams Open

Vasilis Tzoganis, O. Kamigaito, M. Kase, T. Nagatomo, T. Nakagawa , et al. · 2016

RIKEN's 18 GHz ECR ion source supplies the AVF cyclotron with beams ranging from protons to heavy ions as xenon. From comparison with the use of the RILAC (RIKEN Linear Accelerator) and beam transport simulations it was found that the tran…

Present Status and Future Plan of RIKEN RI Beam Factory Open

O. Kamigaito, Tomoyuki Dantsuka, Masaki Fujimaki, Nobuhisa Fukunishi, Hiroo Hasebe , et al. · 2016

Recent efforts concerning the accelerators of the RIKEN RI Beam Factory (RIBF) have been directed towards achieving higher heavy-ion beam intensities. As shown at the IPAC2014 conference, the intensities of these ion beams have improved si…

Muonic Atom Formation by Muon Transfer Process in C6H6or C6H12and CCl4Mixtures Open

M. Inagaki, Kazuhiko Ninomiya, Kazuya Fujihara, Go Yoshida, Y. Kasamatsu , et al. · 2015

Elemental Analysis of Bronze Artifacts by Muonic X-ray Spectroscopy Open

Kazuhiko Ninomiya, M. K. Kubo, P. Strasser, T. Nagatomo, Yoshio Kobayashi , et al. · 2015

Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan Colleage of Liberal Arts, International Christian University, 3-10-2 Osawa, Mitaka, Tokyo 181-8585, Japan Institute of Materials Structure Sci…

Tuning of Ultra-Slow Muon Transport System Open

T. Adachi, Yutaka Ikedo, Kusuo Nishiyama, Atsushi Yabuuchi, T. Nagatomo , et al. · 2015

The ultra-slow muon beam is expected to be a new probe for surface and interface physics.A new beamline for the ultra-slow muon is now under construction at the J-PARC.Before transporting ultra-slow muons through the transport system, we t…

Tuning of the ultra slow muon beamline by utilizing ionized hydrogen. Open

T. Adachi, Yutaka Ikedo, Atsushi Yabuuchi, P. Strasser, Kenji Kojima , et al. · 2015

The ultra-slow muon beam is expected to be a new probe for surface and interface physics.A new beamline for the ultra-slow muon is now under construction at the J-PARC.Before transporting ultra-slow muons through the transport system, we t…

Production of Spin Polarized 58Cu and its Magnetic Moment Open

M. Mihara, Yoko Ishibashi, Yasushi Abe, Y. Kamisho, Yusuke Morita , et al. · 2015

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