26 results on '"Umeda, N."'
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2. Achievement of high power and long pulse negative ion beam acceleration for JT-60SA NBI
3. Development of design technique for vacuum insulation in large size multi-aperture multi-grid accelerator for nuclear fusion
4. Time evolution of negative ion profile in a large cesiated negative ion source applicable to fusion reactors
5. Development of the negative ion beams relevant to ITER and JT-60SA at Japan Atomic Energy Agency
6. Long-pulse beam acceleration of MeV-class H− ion beams for ITER NB accelerator
7. 100 s extraction of negative ion beams by using actively temperature-controlled plasma grid
8. Development of negative ion extractor in the high-power and long-pulse negative ion source for fusion application
9. Vacuum insulation of the high energy negative ion source for fusion application
10. Effect of non-uniform electron energy distribution function on plasma production in large arc driven negative ion source
11. Voltage holding study of 1 MeV accelerator for ITER neutral beam injector
12. Beam optics in a MeV-class multi-aperture multi-grid accelerator for the ITER neutral beam injector
13. Analyses of high power negative ion accelerators for ITER neutral beam injector (invited)
14. Long pulse H− ion beam acceleration in MeV accelerator
15. Analysis of secondary particle behavior in multiaperture, multigrid accelerator for the ITER neutral beam injector
16. Acceleration of ampere class H− ion beam by MeV accelerator
17. Uniform H− ion beam extraction in a large negative ion source with a tent-shaped magnetic filter
18. Spectroscopic observations of beam and source plasma light and testing Cs-deposition monitor in the large area negative ion source for LHD-NBI
19. Embedment of ZnO nanoparticles in SiO2 by ion implantation and low-temperature oxidation
20. Optical transitions of Cu2O nanocrystals in SiO2 fabricated by ion implantation and two-step annealing
21. Zn and ZnO nanoparticles fabricated by ion implantation combined with thermal oxidation, and the defect-free luminescence
22. Fabrication of ZnO nanoparticles in SiO2 by ion implantation combined with thermal oxidation
23. Fabrication of nickel oxide nanoparticles in SiO2 by metal-ion implantation combined with thermal oxidation
24. Present status of the negative ion based neutral beam injector for JT-60U
25. Surface morphology and structural changes in insulators induced by high-current 60 keV Cu− implantation
26. Power flow in the negative-ion based neutral beam injection for JT-60
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