N. Umeda

1.8k total citations
80 papers, 733 citations indexed

About

N. Umeda is a scholar working on Aerospace Engineering, Nuclear and High Energy Physics and Electrical and Electronic Engineering. According to data from OpenAlex, N. Umeda has authored 80 papers receiving a total of 733 indexed citations (citations by other indexed papers that have themselves been cited), including 74 papers in Aerospace Engineering, 54 papers in Nuclear and High Energy Physics and 51 papers in Electrical and Electronic Engineering. Recurrent topics in N. Umeda's work include Particle accelerators and beam dynamics (72 papers), Magnetic confinement fusion research (53 papers) and Plasma Diagnostics and Applications (35 papers). N. Umeda is often cited by papers focused on Particle accelerators and beam dynamics (72 papers), Magnetic confinement fusion research (53 papers) and Plasma Diagnostics and Applications (35 papers). N. Umeda collaborates with scholars based in Japan, United States and France. N. Umeda's co-authors include M. Kashiwagi, K. Watanabe, H. Tobari, M. Taniguchi, M. Hanada, Takashi Inoue, L. Grisham, M. Dairaku, A. Kojima and Minoru Takahashi and has published in prestigious journals such as Review of Scientific Instruments, Nuclear Fusion and IEEE Transactions on Dielectrics and Electrical Insulation.

In The Last Decade

N. Umeda

77 papers receiving 685 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
N. Umeda Japan 15 621 556 449 167 104 80 733
B. Schunke France 10 480 0.8× 465 0.8× 350 0.8× 97 0.6× 124 1.2× 20 610
Yuanlai Xie China 13 513 0.8× 429 0.8× 325 0.7× 139 0.8× 143 1.4× 101 682
M. Dalla Palma Italy 14 745 1.2× 690 1.2× 411 0.9× 227 1.4× 204 2.0× 98 941
P. Agostinetti Italy 16 889 1.4× 798 1.4× 631 1.4× 164 1.0× 133 1.3× 106 990
J. Graceffa France 8 608 1.0× 520 0.9× 399 0.9× 110 0.7× 108 1.0× 18 676
E. Sartori Italy 16 817 1.3× 651 1.2× 531 1.2× 149 0.9× 177 1.7× 133 893
Mahendrajit Singh India 8 397 0.6× 353 0.6× 251 0.6× 88 0.5× 98 0.9× 30 462
F. Geli France 5 569 0.9× 493 0.9× 389 0.9× 89 0.5× 90 0.9× 11 631
Caichao Jiang China 16 635 1.0× 522 0.9× 492 1.1× 91 0.5× 94 0.9× 85 733
M. Kuriyama Japan 14 306 0.5× 338 0.6× 159 0.4× 133 0.8× 199 1.9× 45 526

Countries citing papers authored by N. Umeda

Since Specialization
Citations

This map shows the geographic impact of N. Umeda's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by N. Umeda with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites N. Umeda more than expected).

Fields of papers citing papers by N. Umeda

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by N. Umeda. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by N. Umeda. The network helps show where N. Umeda may publish in the future.

Co-authorship network of co-authors of N. Umeda

This figure shows the co-authorship network connecting the top 25 collaborators of N. Umeda. A scholar is included among the top collaborators of N. Umeda based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with N. Umeda. N. Umeda is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Ichikawa, Masahiro, A. Kojima, J. Hiratsuka, et al.. (2020). Achievement of stable negative ion production with Cs-seeded for long pulse beam operation in the prototype of Cs-seeded negative ion source for JT-60SA. Review of Scientific Instruments. 91(2). 23502–23502. 5 indexed citations
2.
Hiratsuka, J., Masahiro Ichikawa, N. Umeda, et al.. (2020). Experimental investigation of the Cs behavior in the cesiated H− ion source during high power long beam operation. Review of Scientific Instruments. 91(1). 13513–13513. 2 indexed citations
3.
Hiratsuka, J., M. Kashiwagi, Masahiro Ichikawa, et al.. (2020). Achievement of high power and long pulse negative ion beam acceleration for JT-60SA NBI. Review of Scientific Instruments. 91(2). 23506–23506. 13 indexed citations
4.
Tobari, H., M. Kashiwagi, K. Watanabe, et al.. (2017). Progress on design and manufacturing of dc ultra-high voltage component for ITER NBI. Fusion Engineering and Design. 123. 309–312. 4 indexed citations
5.
Ichikawa, Masahiro, M. Yoshida, A. Kojima, et al.. (2016). Investigation of Oxygen-Induced-Arcing in Cs-Seeded Negative Ion Source. Plasma and Fusion Research. 11(0). 2405108–2405108. 4 indexed citations
6.
Yoshida, M., M. Hanada, Akira Kojima, et al.. (2015). Time evolution of negative ion profile in a large cesiated negative ion source applicable to fusion reactors. Review of Scientific Instruments. 87(2). 02B144–02B144. 12 indexed citations
7.
Kashiwagi, M., N. Umeda, H. Tobari, et al.. (2014). Development of negative ion extractor in the high-power and long-pulse negative ion source for fusion application. Review of Scientific Instruments. 85(2). 02B320–02B320. 22 indexed citations
8.
Kashiwagi, M., M. Taniguchi, N. Umeda, et al.. (2013). Compensations of beamlet deflections for 1 MeV accelerator of ITER NBI. AIP conference proceedings. 227–236. 11 indexed citations
9.
Kojima, Akira, M. Hanada, M. Yoshida, et al.. (2013). Long-pulse production of the negative ion beams for JT-60SA. Fusion Engineering and Design. 88(6-8). 918–921. 5 indexed citations
10.
Shibata, Takemasa, M. Kashiwagi, Takashi Inoue, et al.. (2013). Analysis of electron temperature distribution by Kinetic modeling of electron energy distribution function in JAEA 10 ampere negative ion source. AIP conference proceedings. 177–186. 7 indexed citations
11.
Taniguchi, M., M. Kashiwagi, N. Umeda, et al.. (2012). Voltage holding study of 1 MeV accelerator for ITER neutral beam injector. Review of Scientific Instruments. 83(2). 02B121–02B121. 14 indexed citations
12.
Watanabe, K., Masahiro Yamamoto, Yasuo Yamashita, et al.. (2009). Design of a −1 MV dc UHV power supply for ITER NBI. Nuclear Fusion. 49(5). 55022–55022. 25 indexed citations
13.
Kashiwagi, M., Takashi Inoue, L. R. Grisham, et al.. (2009). Compensation of beamlet repulsion in a large negative ion source with a multi aperture accelerator. AIP conference proceedings. 421–430. 6 indexed citations
14.
Taniguchi, M., H.P.L. de Esch, Lennart Svensson, et al.. (2009). Development of 1 MeV H[sup −] Accelerator at JAEA for ITER NB. AIP conference proceedings. 335–343. 10 indexed citations
15.
Taniguchi, M., Takashi Inoue, N. Umeda, et al.. (2008). Acceleration of ampere class H− ion beam by MeV accelerator. Review of Scientific Instruments. 79(2). 02C110–02C110. 11 indexed citations
16.
Hanada, M., Takashi Inoue, M. Kashiwagi, et al.. (2007). R&D progress at JAEA towards production of high power and large-area negative ion beams for ITER. Nuclear Fusion. 47(9). 1142–1146. 3 indexed citations
17.
Hanada, M., Takashi Inoue, M. Kashiwagi, et al.. (2006). Production of High Power and Large-Area Negative Ion Beams for ITER. 1 indexed citations
18.
Umeda, N., T. Yamamoto, M. Hanada, et al.. (2005). Recent progress of negative ion based neutral beam injector for JT-60U. Fusion Engineering and Design. 74(1-4). 385–390. 6 indexed citations
19.
Okano, Kunihiko, T. Suzuki, N. Umeda, et al.. (2005). Experimental Validation of Beam Particle Self Interaction in JT-60U by Use of N-NB. Journal of Plasma and Fusion Research. 81(8). 579–580. 1 indexed citations
20.
Grisham, L., et al.. (2001). Improvement of JT-60U negative ion source performance. Nuclear Fusion. 41(5). 597–601. 9 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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