Ryo Nishikiori

Numerical–Experimental Benchmarking of a Probabilistic Code for Prediction of Voltage Holding in High Vacuum

N. Pilan, A. Kojima, Ryo Nishikiori, Masahiro Ichikawa et autres

In the framework of the program for the construction of 1 MeV-16 MW negative neutral beam injector (NNBI) for ITER, a research and development activity on voltage holding in vacuum has been initiated since 2009, aimed at supporting the design, construction, and …

it (code pays fourni par la source)

Analysis on acceleration of DT-mixed ion beams in a negative ion accelerator for a DT-mixed Neutral Beam Injector

A. Kojima, M. Kashiwagi, Sylvia Maria Matsuda, M. Hanada et autres

jp (code pays fourni par la source)

Measurements of Interaction Cross Sections for 19–27F Isotopes

Akira Homma, M. Takechi, Takashi Ohtsubo, D. Nishimura et autres

jp, de, cn (code pays fourni par la source)

Development of long-pulse high-power-density negative ion beams with a multi-aperture multi-grid accelerator

A. Kojima, J. Hiratsuka, N. Umeda, Masaya Hanada et autres

jp, us (code pays fourni par la source)

Determination of the meniscus shape of a negative ion beam from an experimentally obtained beam profile

Masahiro Ichikawa, A. Kojima, G. Chitarin, P. Agostinetti et autres

In order to understand the physics mechanism of a negative ion extraction in negative ion sources, an emission surface of the negative ions around an aperture at a plasma grid, so-called a meniscus, has been analyzed by an inverse calculation of the …

jp, it (code pays fourni par la source)

Evaluation of Dark Current Profile for Prediction of Voltage Holding Capability on Multi-Aperture Multi-Grid Accelerator for ITER

Ryo Nishikiori, A. Kojima, Masaya Hanada, M. Kashiwagi et autres

Dark current analysis to estimate the current density of the field-emitted electrons have been developed for the prediction of the yoltage holding capability of multi-aperture multi-grid accelerators used in JT-60SA and ITER neutral beam injectors. From the experimental measurement of the field-emitted …

jp (code pays fourni par la source)

Investigation of Oxygen-Induced-Arcing in Cs-Seeded Negative Ion Source

Masahiro Ichikawa, M. Yoshida, A. Kojima, Masaya Hanada et autres

High-power and long-pulse arc discharges of 150 kW for 100 s have been achieved for the first time by suppressing oxygen-induced-arcing which was one of the critical issues on JT-60SA negative ion source. Toward the realization of such arc discharge, the suppression …

jp (code pays fourni par la source)

Development of the negative ion beams relevant to ITER and JT-60SA at Japan Atomic Energy Agency

M. Hanada, A. Kojima, H. Tobari, Ryo Nishikiori et autres

In order to realize negative ion sources and accelerators to be applicable to International Thermonuclear Experimental Reactor and JT-60 Super Advanced, a large cesium (Cs)-seeded negative ion source and a multi-aperture and multi-stage electric acceleration have been developed at Japan Atomic Energy …

jp, us (code pays fourni par la source)

Measurement of heat load density profile on acceleration grid in MeV-class negative ion accelerator

J. Hiratsuka, Masaya Hanada, A. Kojima, N. Umeda et autres

To understand the physics of the negative ion extraction/acceleration, the heat load density profile on the acceleration grid has been firstly measured in the ITER prototype accelerator where the negative ions are accelerated to 1 MeV with five acceleration stages. In order …

jp (code pays fourni par la source)

Development of design technique for vacuum insulation in large size multi-aperture multi-grid accelerator for nuclear fusion

A. Kojima, M. Hanada, H. Tobari, Ryo Nishikiori et autres

Design techniques for the vacuum insulation have been developed in order to realize a reliable voltage holding capability of multi-aperture multi-grid (MAMuG) accelerators for fusion application. In this method, the nested multi-stage configuration of the MAMuG accelerator can be uniquely designed to …

jp, us (code pays fourni par la source)

Evidence of halo structure in Mg 37 observed via reaction cross sections and intruder orbitals beyond the island of inversion

M. Takechi, Sinji Suzuki, D. Nishimura, Mitsunori Fukuda et autres

Precise reaction cross sections (${\ensuremath{\sigma}}_{R}$) for $^{24\ensuremath{-}38}\mathrm{Mg}$ on C targets at energies around 240 MeV/nucleon have been measured at the Radioactive Isotope Beam Factory at RIKEN. The ${\ensuremath{\sigma}}_{R}$ for $^{36\ensuremath{-}38}\mathrm{Mg}$ have been measured for the first time. An enhancement of ${\ensuremath{\sigma}}_{R}$ compared …

de, jp, cn (code pays fourni par la source)

In-beam γ-ray Spectroscopy of 30P via the 28Si(3He,pγ)30P Reaction

E. McNeice, K. Setoodehnia, Bhupendra Kumar Singh, Yasuaki ABE et autres

ca, jp, it (code pays fourni par la source)