Kubo Takayuki 久保毅幸

Researcher Number	30712666
Other IDs
Affiliation (Current)	2025: 大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 助教
Affiliation (based on the past Project Information) *help	2015 – 2025: 大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 助教 2017: 大学共同利用機関法人高エネルギー加速器研究機構, その他部局等, 助教 2015: 大学共同利用機関法人高エネルギー加速器研究機構, その他部局等, 助教 2014: 大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 研究員
Review Section/Research Field	Principal Investigator Particle/Nuclear/Cosmic ray/Astro physics Except Principal Investigator Basic Section 28020:Nanostructural physics-related / Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields / Basic Section 80040:Quantum beam science-related / Quantum beam science
Keywords	Principal Investigator 加速器 / 超伝導 / 加速空洞 / 薄膜 / 超伝導共振器 / 超伝導加速空洞 / 素粒子実験 / 超伝導材料・素子 / ニオブ３スズ / 窒化ニオブ … More / ニオブ / 積層薄膜 / Q値 / 表面抵抗 / 超伝導加速器 / 多層膜 … More Except Principal Investigator 薄膜 / 超伝導空洞 / 超伝導加速空洞 / 積層薄膜 / 超伝導 / 暗黒物質 / 磁気共鳴 / 量子情報技術 / マイクロ波共振器 / 成膜 / 積層薄膜構造 / 空洞 / 高調波 / 超伝導空胴 / 超伝導加速管 / 高周波 Less

Superconducting Resonators with High Quality Factors under millikelvin Temperatures and Strong Magnetic Fields
- Principal Investigator
  
  久保結丸
- Project Period (FY)
  2025 – 2027
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 28020:Nanostructural physics-related
- Research Institution
  Okinawa Institute of Science and Technology Graduate University
積層薄膜構造導入による次世代超伝導加速空洞開発のための新成膜手法の開発
- Principal Investigator
  
  片山領
- Project Period (FY)
  2023 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Review Section
  
  Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
- Research Institution
  High Energy Accelerator Research Organization
New phase of the study for the next-generation SRF cavity by introducing the artifical thin-film structure
- Principal Investigator
  
  Ryo Katayama
- Project Period (FY)
  2019 – 2023
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 80040:Quantum beam science-related
- Research Institution
  High Energy Accelerator Research Organization
超伝導積層薄膜構造における表面抵抗の磁場強度依存の研究Principal Investigator
- Principal Investigator
  
  久保毅幸
- Project Period (FY)
  2018 – 2024
- Research Category
  
  Fund for the Promotion of Joint International Research (Fostering Joint International Research)
- Research Field
  
  Particle/Nuclear/Cosmic ray/Astro physics
- Research Institution
  High Energy Accelerator Research Organization
Superconducting multilayer-structure for next-generation superconducting-acceleratorsPrincipal Investigator
- Principal Investigator
  
  Kubo Takayuki
- Project Period (FY)
  2017 – 2020
- Research Category
  
  Grant-in-Aid for Young Scientists (A)
- Research Field
  
  Particle/Nuclear/Cosmic ray/Astro physics
- Research Institution
  High Energy Accelerator Research Organization
Measurement of the magnetic field distribution in multilayer superconductorsPrincipal Investigator
- Principal Investigator
  
  Kubo Takayuki
- Project Period (FY)
  2014 – 2016
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Particle/Nuclear/Cosmic ray/Astro physics
- Research Institution
  High Energy Accelerator Research Organization
Dramatic improvement of superconducting accelerating cavity performance by introduction of laminated thin film structure
- Principal Investigator
  
  Iwashita Yoshihisa
- Project Period (FY)
  2014 – 2017
- Research Category
  
  Grant-in-Aid for Challenging Exploratory Research
- Research Field
  
  Quantum beam science
- Research Institution
  Kyoto University

All 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 Other

All Journal Article Presentation

[Journal Article] Tuning Critical Field, Critical Current, and Diode Effect of Narrow Thin-Film Superconductors Through Engineering Inhomogeneous Pearl Length2023
- Author(s)
  Kubo Takayuki
- Journal Title
  
  Physical Review Applied
  
  Volume: 20 Issue: 3 Pages: 034033-034033
- DOI
  10.1103/physrevapplied.20.034033
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17KK0100
[Journal Article] An Encouraging of Paternity Leave: A Physicist Who Has Become a Stay-at-Home Dad in New York2023
- Author(s)
  久保毅幸
- Journal Title
  
  Journal of the Particle Accelerator Society of Japan
  
  Volume: 20 Issue: 1 Pages: 50-56
- DOI
  10.50868/pasj.20.1_50
- ISSN
  1349-3833, 2436-1488
- Year and Date
  2023-04-30
- Language
  Japanese
- Open Access
- Data Source
  KAKENHI-PROJECT-17KK0100
[Journal Article] Effects of Nonmagnetic Impurities and Subgap States on the Kinetic Inductance, Complex Conductivity, Quality Factor, and Depairing Current Density2022
- Author(s)
  Kubo Takayuki
- Journal Title
  
  Physical Review Applied
  
  Volume: 17 Issue: 1 Pages: 014018-014018
- DOI
  10.1103/physrevapplied.17.014018
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17KK0100
[Journal Article] S’IS構造による加速空洞の高性能化に向けたNb3Sn薄膜の成膜プロセス最適化2021
- Author(s)
  永田智啓，伊藤亮平，井藤隼人，早野仁司，久保毅幸，佐伯学行，片山領，岩下芳久
- Journal Title
  
  Proceedings of the 17th Annual Meeting of Particle Accelerator Society of Japan
  
  Volume: - Pages: 747-751
- Open Access
- Data Source
  KAKENHI-PROJECT-19H04395
[Journal Article] NbN積層薄膜構造に対する磁束侵入磁場測定2021
- Author(s)
  井藤隼人，早野仁司，久保毅幸，佐伯学行，片山領，岩下芳久，頓宮拓，伊藤亮平，永田智啓
- Journal Title
  
  Proceedings of the 17th Annual Meeting of Particle Accelerator Society of Japan
  
  Volume: - Pages: 541-544
- Open Access
- Data Source
  KAKENHI-PROJECT-19H04395
[Journal Article] Depairing Current Density in a Nutshell2021
- Author(s)
  Takayuki KUBO
- Journal Title
  
  TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
  
  Volume: 56 Issue: 5 Pages: 277-282
- DOI
  10.2221/jcsj.56.277
- NAID
  130008090666
- ISSN
  0389-2441, 1880-0408
- Language
  Japanese
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17KK0100
[Journal Article] Superheating fields of semi-infinite superconductors and layered superconductors in the diffusive limit: structural optimization based on the microscopic theory2021
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Superconductor Science and Technology
  
  Volume: 34 Issue: 4 Pages: 045006-045006
- DOI
  10.1088/1361-6668/abdedd
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17KK0100, KAKENHI-PROJECT-19H04395, KAKENHI-PROJECT-17H04839
[Journal Article] Vortex penetration field measurement system based on third-harmonic method for superconducting RF materials2020
- Author(s)
  Hayato Ito, Hitoshi Hayano, Takayuki Kubo, and Takayuki Saeki
- Journal Title
  
  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
  
  Volume: 955 Pages: 163284-163284
- DOI
  10.1016/j.nima.2019.163284
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Superfluid flow in disordered superconductors with Dynes pair-breaking scattering: Depairing current, kinetic inductance, and superheating field2020
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Physical Review Research
  
  Volume: 2 Issue: 3 Pages: 033203-033203
- DOI
  10.1103/physrevresearch.2.033203
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17KK0100, KAKENHI-PROJECT-19H04395, KAKENHI-PROJECT-17H04839
[Journal Article] Weak-field dissipative conductivity of a dirty superconductor with Dynes subgap states under a dc bias current up to the depairing current density2020
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Physical Review Research
  
  Volume: 2 Issue: 1 Pages: 13302-13302
- DOI
  10.1103/physrevresearch.2.013302
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17KK0100, KAKENHI-PROJECT-17H04839
[Journal Article] Nb3Sn Thin Film Coating Method for Superconducting Multilayered Structure2019
- Author(s)
  R. Ito, T. Nagata, H. Hayano, R. Katayama, T. Kubo, T. Saeki, H. Ito, Y. Iwashita
- Journal Title
  
  JACoW Publishing
  
  Volume: - Pages: 628-631
- Open Access
- Data Source
  KAKENHI-PROJECT-19H04395
[Journal Article] 超伝導加速空洞の物理と課題、そして性能向上への理論的示唆ー新規参入の誘いー2019
- Author(s)
  久保毅幸
- Journal Title
  
  低温工学
  
  Volume: 54
- NAID
  130007686708
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Fabrication of 3.0-GHz Single-cell Cavities for Thin-film Study2019
- Author(s)
  T. Saeki, H. Hayano, T. Kubo, H. Inoue, R. Katayama, F. E. Hannon, R. Rimmer, A.-M. Valente-Feliciano, Y. Iwashita, H. Tongu, H. Ito
- Journal Title
  
  Proceedings of SRF2019
  
  Volume: - Pages: 177-181
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] 超伝導加速空洞の物理と課題、そして性能向上への理論的示唆ー新規参入の誘いー2019
- Author(s)
  久保毅幸
- Journal Title
  
  低温工学
  
  Volume: 54
- NAID
  130007686708
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17KK0100
[Journal Article] Evaluation of the Superconducting Characteristics of Multi-Layer Thin-Film Structures of NbN and SiO2 on Pure Nb Sunstrate2019
- Author(s)
  R. Katayama, H. Hayano, T. Kubo, T. Saeki, C.Z. Antoine, H. Ito, R. Ito, Y. Iwashita, H. Tongu, T. Nagata
- Journal Title
  
  Proceedings of SRF2019
  
  Volume: - Pages: 809-811
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Field-dependent nonlinear surface resistance and its optimization by surfacenanostructuring in superconductors2019
- Author(s)
  Takayuki Kubo and Alex Gurevich
- Journal Title
  
  Physical Review B
  
  Volume: 100 Issue: 6 Pages: 64522-64522
- DOI
  10.1103/physrevb.100.064522
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17KK0100, KAKENHI-PROJECT-19H04395, KAKENHI-PROJECT-17H04839
[Journal Article] Lower Critical Field Measurement of NbN Multilayer Thin Film Superconductor at KEK2019
- Author(s)
  H. Ito, H. Hayano, T. Kubo, T. Saeki, R. Katayama, Y. Iwashita, H. Tongu, R. Ito, T. Nagata, C. Z. Antoine
- Journal Title
  
  Proceedings of SRF2019
  
  Volume: - Pages: 634-638
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Optimum multilayer coating of superconducting particle accelerator cavities and effects of thickness dependent material properties of thin films2019
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Japanese Journal of Applied Physics
  
  Volume: 58 Issue: 8 Pages: 088001-088001
- DOI
  10.7567/1347-4065/ab2f0a
- NAID
  210000156608
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-19H04395, KAKENHI-PROJECT-17H04839
[Journal Article] Nb3Sn Thin Film Coating Method for Superconducting Multilayered Structure2019
- Author(s)
  R. Ito, T. Nagata, H. Hayano, R. Katayama, T. Kubo, T. Saeki, Y. Iwashita, H. Ito
- Journal Title
  
  Proceedings of SRF2019
  
  Volume: - Pages: 630-633
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Evaluation of the Superconducting Characteristics of Multi‐Layer Thin‐Film Structures of NbN/SiO2 on Pure Nb Substrate2019
- Author(s)
  R. Katayama, H. Hayano, T. Kubo, T. Saeki, C.Z. Antoine, H. Ito, R. Ito, Y. Iwashita, H. Tongu, T.Nagata
- Journal Title
  
  JACoW Publishing
  
  Volume: - Pages: 807-809
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19H04395
[Journal Article] Physics and Challenges of Superconducting Cavities for Particle Accelerators and Theoretical Implication towards Higher Performance:2019
- Author(s)
  Takayuki Kubo
- Journal Title
  
  TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
  
  Volume: 54 Issue: 4 Pages: 275-282
- DOI
  10.2221/jcsj.54.275
- NAID
  130007686708
- ISSN
  0389-2441, 1880-0408
- Year and Date
  2019-07-20
- Language
  Japanese
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17KK0100, KAKENHI-PROJECT-17H04839
[Journal Article] Development of Coating Technique for Superconducting Multilayered Structure2018
- Author(s)
  R. Ito, T. Nagata, H. Hayano, T. Kubo, T. Saeki, H. Ito, Y. Iwashita, R. Katayama, H. Oikawa
- Journal Title
  
  Proceedings of 9th International Particle Accelerator Conference
  
  Volume: - Pages: 4954-4956
- DOI
  10.18429/JACOW-IPAC2018-THPML120
- Open Access
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Progress on Characterization and Optimization of Multilayers2018
- Author(s)
  C. Z. Antoine, M. Aburas, H Hayano, S Kato, T Kubo, T Saeki, Y Iwashita
- Journal Title
  
  Proceedings of the 18th International Conference on RF Superconductivity
  
  Volume: 1 Pages: 368-373
- DOI
  10.18429/JACoW-SRF2017-TUYBA01
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] Precise Evaluation of Characteristic of the Multi-layer Thin-film Superconductor Consisting of NbN and Insulator on Pure Nb Substrate2018
- Author(s)
  R. Katayama, Y. Iwashita, H. Tongu, C. Z. Antoine, A. Four, H. Hayano, T. Kubo, T. Saeki, H. Ito, R. Ito, T. Nagata, H. Oikawa
- Journal Title
  
  Proceedings of 29th Linear Accelerator Conference
  
  Volume: - Pages: 391-394
- DOI
  10.18429/JACOW-LINAC2018-TUPO030
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] R&D OF THIN FILM COATING ON SUPERCONDUCTORS2018
- Author(s)
  Y. Iwashita, R. Katayama, H. Tongu, H. Hayano, T. Kubo, T. Saeki, M. Hino, H. Oikawa
- Journal Title
  
  Proceedings of the 18th International Conference on RF Superconductivity
  
  Volume: 1 Pages: 877-890
- DOI
  10.18429/JACoW-SRF2017-THPB058
- Open Access
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] Construction of Thin-film Coating System Toward the Realization of Superconducting Multilayered Structure2018
- Author(s)
  R. Ito, T. Nagata, H. Hayano, T. Kubo, T. Saeki, H. Ito, Y. Iwashita, R. Katayama, H. Oikawa
- Journal Title
  
  Proceedings of 29th Linear Accelerator Conference
  
  Volume: - Pages: 445-447
- DOI
  10.18429/JACOW-LINAC2018-TUPO050
- Open Access
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Lower Critical Field Measurement of Thin Film Superconductor2018
- Author(s)
  H. Ito, C.Z. Antoine, A. Four, H. Hayano, T. Kubo, T. Saeki, R. Ito, T. Nagata, Y. Iwashita, R. Katayama, H. Tongu, H. Oikawa
- Journal Title
  
  Proceedings of 29th Linear Accelerator Conference
  
  Volume: - Pages: 484-487
- DOI
  10.18429/JACOW-LINAC2018-TUPO066
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Lower Critical Field Measurement System of Thin Film Superconductor2018
- Author(s)
  H. Ito, C. Z. Antoine, A. Four, H. Hayano, T. Kubo, T. Saeki, R. Ito, T. Nagata, Y. Iwashita, R. Katayama, H. Tongu, H. Oikawa
- Journal Title
  
  Proceedings of 9th International Particle Accelerator Conference
  
  Volume: - Pages: 3882-3884
- DOI
  10.18429/JACOW-IPAC2018-THPAL105
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] EVALUATION OF SUPERCONDUCTING CHARACTERISTICS ON THE THIN-FILM STRUCTURE BY NbN AND INSULATOR COATINGS ON PURE Nb SUBSTRATE2018
- Author(s)
  R. Katayama, Y. Iwashita, H. Tongu A. Four, C. Z. Antoine, H. Hayano, T. Kubo, T. Saeki, Hayato Ito, R. Ito, T. Nagata, H. Oikawa
- Journal Title
  
  Proceedings of the 9th International Particle Accelerator Conference
  
  Volume: 1
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] Evaluation of superconducting characteristics on the thin-film structure by NbN and Insulator coatings on pure Nb substrate2018
- Author(s)
  R. Katayama, Y. Iwashita, H. Tongu, C.Z. Antoine, A. Four, H. Hayano, T. Kubo, T. Saeki, H. Ito, R. Ito, T. Nagata, H. Oikawa
- Journal Title
  
  Proceedings of 9th International Particle Accelerator Conference
  
  Volume: - Pages: 3653-3655
- DOI
  10.18429/JACOW-IPAC2018-THPAL015
- Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] Multilayer coating for higher accelerating fields in superconducting radio-frequency cavities: a review of theoretical aspects2017
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Superconductor Science and Technology
  
  Volume: 30 Issue: 2 Pages: 023001-023001
- DOI
  10.1088/1361-6668/30/2/023001
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-26800157, KAKENHI-PROJECT-26600142
[Journal Article] Measurement of Thin Film Coating on Superconductors2017
- Author(s)
  Y. Iwashita, Y. Fuwa, H. Tongu, H. Hayano, T. Kubo, T. Saeki, M. Hino, H. Oikawa
- Journal Title
  
  Proceedings of the 8th International Particle Accelerator Conference
  
  Volume: 1 Pages: 1043-1045
- DOI
  10.18429/JACoW-IPAC2017-MOPVA076
- Open Access
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] 三次高調波電圧誘導法による多層膜コーティング超伝導薄膜の評価2017
- Author(s)
  片山領，岩下芳久，頓宮拓，及川大基，加藤茂樹，久保毅幸，佐伯学行，早野仁司，日野正裕
- Journal Title
  
  Proceedings of the 14th Annual Meeting of Particle Accelerator Society of Japan
  
  Volume: 1 Pages: 27-29
- Open Access
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] Surface impedance and optimum surface resistance of a superconductor with an imperfect surface2017
- Author(s)
  Alex Gurevich and Takayuki Kubo
- Journal Title
  
  Physical Review B
  
  Volume: 96 Issue: 18 Pages: 184515-184515
- DOI
  10.1103/physrevb.96.184515
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Journal Article] 超伝導薄膜の特性測定2016
- Author(s)
  岩下芳久，頓宮拓，不破康裕，早野仁司，佐伯学行，久保毅幸
- Journal Title
  
  Proceedings of the 13th Annual Meeting of Particle Accelerator Society of Japan
  
  Volume: - Pages: 851-852
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] 薄膜超伝導体の高周波臨界磁場評価のためのニオブ製マッシュルーム型空洞の設計研究2016
- Author(s)
  及川大基，東口武史，岩下芳久，日野正裕，久保毅幸，加藤茂樹，佐伯学行，早野仁司
- Journal Title
  
  Proceedings of the 13th Annual Meeting of Particle Accelerator Society of Japan
  
  Volume: - Pages: 372-376
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] Dependence of trapped-flux-induced surface resistance of a large-grain Nb SRF cavity on spatial temperature gradient during cool-down through Tc2016
- Author(s)
  Shichun Huang, Takayuki Kubo, and R. L.Geng
- Journal Title
  
  Physical Review Accelerators and Beams
  
  Volume: 19 Issue: 8 Pages: 082001-082001
- DOI
  10.1103/physrevaccelbeams.19.082001
- Peer Reviewed / Acknowledgement Compliant / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157, KAKENHI-PROJECT-26600142
[Journal Article] EVALUATION OF SC PROPERTY COATED ON A SURFACE2016
- Author(s)
  Y. Iwashita, Y. Fuwa, M. Hino, T. Kubo, T. Saeki
- Journal Title
  
  Proceedings of the 17th International Conference on RF Superconductivity (SRF2015)
  
  Volume: - Pages: 723-725
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] Construction of Measurement System for Superconducting Characteristics on Thin-film Samples at KEK2016
- Author(s)
  T. Saeki,　H. Hayano,　T. Kubo,　Y. Iwashita,　H. Oikawa
- Journal Title
  
  Proceedings of IPAC2016
  
  Volume: - Pages: 2167-2169
- DOI
  10.18429/JACoW-IPAC2016-WEPMB021
- Data Source
  KAKENHI-PROJECT-26600142
[Journal Article] Flux trapping in superconducting accelerating cavities during cooling down with a spatial temperature gradient2016
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Progress of Theoretical and Experimental Physics
  
  Volume: 2016 Issue: 5 Pages: 053G01-053G01
- DOI
  10.1093/ptep/ptw049
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-26800157, KAKENHI-PROJECT-26600142
[Journal Article] Magnetic field enhancement at a pit on the surface of a superconducting accelerating cavity2015
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Progress of Theoretical and Experimental Physics
  
  Volume: 2015 Issue: 7 Pages: 073G01-073G01
- DOI
  10.1093/ptep/ptv088
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-26800157
[Journal Article] Field limit and nano-scale surface topography of superconducting radio-frequency cavity made of extreme type II superconductor2015
- Author(s)
  Takayuki Kubo
- Journal Title
  
  Progress of Theoretical and Experimental Physics
  
  Volume: 2015 Issue: 6 Pages: 63G01-0
- DOI
  10.1093/ptep/ptv082
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] 磁性・非磁性不純物、表面の薄い常伝導層との近接効果、サブギャップ状態密度は、どのように超伝導デバイスの特性に影響を与えるか：表面抵抗、力学インダクタンス、対破壊電流の観点から2024
- Author(s)
  久保毅幸
- Organizer
  応用物理学会
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] 不均一な不純物分布による超伝導薄膜の臨界磁場、臨界電流、およびダイオード効果の向上2024
- Author(s)
  久保毅幸
- Organizer
  応用物理学会
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] 超伝導加速空洞の理論研究2021
- Author(s)
  久保毅幸
- Organizer
  第15回日本物理学会若手奨励賞 (March 13, 2021)
- Data Source
  KAKENHI-PROJECT-19H04395
[Presentation] 超伝導加速空洞の理論研究2021
- Author(s)
  久保毅幸
- Organizer
  第76回日本物理学会年次大会
- Invited
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] 超伝導加速空洞の理論研究2021
- Author(s)
  久保毅幸
- Organizer
  第76回日本物理学会年次大会（オンライン）
- Invited
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] ILCが切り拓く加速器新技術2020
- Author(s)
  久保毅幸
- Organizer
  日本物理学会(Sep.15, 2020)
- Invited
- Data Source
  KAKENHI-PROJECT-19H04395
[Presentation] 粒子加速器のための超伝導共振空洞の高Q値化:空洞表面処理技術と理論研究の現状2020
- Author(s)
  久保毅幸
- Organizer
  超伝導エレクトロニクス研究会 (Nov.25, 2020)
- Invited
- Data Source
  KAKENHI-PROJECT-19H04395
[Presentation] 粒子加速器のための超伝導共振空洞の高Q値化:空洞表面処理技術と理論研究の現状2020
- Author(s)
  久保毅幸
- Organizer
  超伝導エレクトロニクス研究会
- Invited
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] BCS超伝導体の非線形表面抵抗のミクロな理論2020
- Author(s)
  久保毅幸
- Organizer
  第99回低温工学・超電導学会研究発表会（オンライン）
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] 超伝導加速空洞の高加速勾配・高Q値化のための理論的基礎2020
- Author(s)
  久保毅幸
- Organizer
  第17回加速器学会年会（オンライン）
- Invited
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] ILCが切り拓く加速器新技術2020
- Author(s)
  久保毅幸
- Organizer
  日本物理学会2020年秋季大会（オンライン）
- Invited
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] ILCが切り拓く加速器新技術2020
- Author(s)
  久保毅幸
- Organizer
  日本物理学会2020年秋季大会
- Invited
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Theory of field-dependent dissipative nonlinear conductivity in superconducting resonators2020
- Author(s)
  Takayuki Kubo
- Organizer
  10th ACASC / 2nd Asian-ICMC / CSSJ Joint Conference, Okinawa Convention Center (Okinawa)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] BCS超伝導体の非線形表面抵抗のミクロな理論2020
- Author(s)
  久保毅幸
- Organizer
  第99回低温工学・超電導学会研究発表会
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] 超伝導加速空洞の高加速勾配・高Q値化のための理論的基礎2020
- Author(s)
  久保毅幸
- Organizer
  第17回加速器学会年会
- Invited
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Theory of field-dependent dissipative nonlinear conductivity in superconducting resonators2020
- Author(s)
  Takayuki Kubo
- Organizer
  10th ACASC / 2nd Asian-ICMC / CSSJ Joint Conference, Okinawa Convention Center (Okinawa)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] 粒子加速器のための超伝導共振空洞の高Q値化:空洞表面処理技術と理論研究の現状2020
- Author(s)
  久保毅幸
- Organizer
  超伝導エレクトロニクス研究会（オンライン）
- Invited
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] 超伝導加速空洞の高加速勾配・高Q値化に繋がる理論的基礎の構築2020
- Author(s)
  久保毅幸
- Organizer
  第16回日本加速器学会奨励賞 (June 24, 2020)
- Data Source
  KAKENHI-PROJECT-19H04395
[Presentation] Fabrication of 3.0-GHz Single-cell Cavities for Thin-film Study2019
- Author(s)
  T. Saeki, H. Hayano, T. Kubo, H. Inoue, R. Katayama, F. E. Hannon, R. Rimmer, A.-M. Valente-Feliciano, Y. Iwashita, H. Tongu, H. Ito
- Organizer
  SRF2019, Dresden (Germany)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Field-dependent nonlinear surface resistance and its optimization by surface nano-structuring of the SRF cavities2019
- Author(s)
  T. Kubo
- Organizer
  The 19th International Conference on RF Superconductivity, Dresden (Germany)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Field-dependent nonlinear surface resistance and its optimization by surface nano-structuring of the SRF cavities2019
- Author(s)
  Takayuki Kubo
- Organizer
  The 19th International Conference on RF Superconductivity, Dresden (Germany)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] Evaluation of the Superconducting Characteristics of Multi-Layer Thin-Film Structures of NbN and SiO2 on Pure Nb Sunstrate2019
- Author(s)
  R. Katayama, H. Hayano, T. Kubo, T. Saeki, C.Z. Antoine, H. Ito, R. Ito, Y. Iwashita, H. Tongu, T. Nagata
- Organizer
  SRF2019, Dresden (Germany)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Nb3Sn Thin Film Coating Method for Superconducting Multilayered Structure2019
- Author(s)
  R. Ito, T. Nagata, H. Hayano, R. Katayama, T. Kubo, T. Saeki, Y. Iwashita, H. Ito
- Organizer
  SRF2019, Dresden (Germany)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Field-Dependent Nonlinear Surface Resistance and Its Optimization by Surface Nano-Structuring of the SRF Cavities2019
- Author(s)
  Takayuki Kubo and Alex Gurevich
- Organizer
  SRF2019, Dresden (Germany)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Field-Dependent Nonlinear Surface Resistance and Its Optimization by Surface Nano-Structuring of the SRF Cavities2019
- Author(s)
  Takayuki Kubo and Alex Gurevich
- Organizer
  SRF2019, Dresden (Germany)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] Lower Critical Field Measurement of NbN Multilayer Thin Film Superconductor at KEK2019
- Author(s)
  H. Ito, H. Hayano, T. Kubo, T. Saeki, R. Katayama, Y. Iwashita, H. Tongu, R. Ito, T. Nagata, C. Z. Antoine
- Organizer
  SRF2019, Dresden (Germany)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Field‐Dependent Nonlinear Surface Resistance and Its Optimization by Surface Nano‐Structuring of the SRF Cavities2019
- Author(s)
  久保毅幸
- Organizer
  The 19th International Conference on RF Superconductivity
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-19H04395
[Presentation] A theory of field-dependent surface resistance and possibilities of engineering optimal SN and SIS surface nano-structuring of the SRF cavities2018
- Author(s)
  Takayuki Kubo
- Organizer
  The 8th International Workshop on Thin Films and New Ideas for Pushing the Limits of RF Superconductivity, the Istituto Nazionale di Fisica Nucleare, Padova (Italy)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17KK0100
[Presentation] A theory of field-dependent surface resistance and possibilities of engineering optimal SN and SIS surface nano-structuring of the SRF cavities2018
- Author(s)
  T. Kubo
- Organizer
  The 8th International Workshop on Thin Films and New Ideas for Pushing the Limits of RF Superconductivity, the Istituto Nazionale di Fisica Nucleare, Padova (Italy)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] EVALUATION OF SUPERCONDUCTING CHARACTERISTICS ON THE THIN-FILM STRUCTURE BY NbN AND INSULATOR COATINGS ON PURE Nb SUBSTRATE2018
- Author(s)
  R. Katayama, Y. Iwashita, H. Tongu A. Four, C. Z. Antoine, H. Hayano, T. Kubo, T. Saeki, Hayato Ito, R. Ito, T. Nagata, H. Oikawa
- Organizer
  9th International Particle Accelerator Conference(IPAC18)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] The Next Technologies2017
- Author(s)
  Takayuki Kubo
- Organizer
  GARD-SRF Roadmap Workshop
- Place of Presentation
  Illinois (USA)
- Year and Date
  2017-02-09
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] The next technologies2017
- Author(s)
  Takayuki Kubo
- Organizer
  GARD-SRF Roadmap Workshop
- Place of Presentation
  Fermilab (Illinois.U.S.A.)
- Year and Date
  2017-02-09
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] 三次高調波電圧誘導法による多層膜コーティング超伝導薄膜の評価2017
- Author(s)
  片山領，岩下芳久，頓宮拓，及川大基，加藤茂樹，久保毅幸，佐伯学行，早野仁司，日野正裕
- Organizer
  第14回日本加速器学会年会
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] Surface impedance and optimum surface resistance of a superconductor with an imperfect surface2017
- Author(s)
  Takayuki Kubo
- Organizer
  TESLA Technology Collaboration (TTC) Topical Workshop, Batavia, Illinois (USA)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] Physics of superconducting cavity: towards realization of high-Q and high gradient2017
- Author(s)
  Takayuki Kubo
- Organizer
  第14回日本加速器学会年会, 北海道大学クラーク会館 (北海道・札幌)
- Invited
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] A unified theory of surface resistance and the residual resistance of SRF cavities at low temperatures2017
- Author(s)
  Takayuki Kubo
- Organizer
  the 18th International Conference on RF Superconductivity, SRF2017, Lanzhou (China)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-17H04839
[Presentation] R&D OF THIN FILM COATING ON SUPERCONDUCTORS2017
- Author(s)
  Y. Iwashita, R. Katayama, H. Tongu, H. Hayano, T. Kubo, T. Saeki, M. Hino, H. Oikawa
- Organizer
  18th International Conference on RF Superconductivity(SRF2017)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] Progress on Characterization and Optimization of Multilayers2017
- Author(s)
  C. Z. Antoine, M. Aburas, H Hayano, S Kato, T Kubo, T Saeki, Y Iwashita
- Organizer
  18th International Conference on RF Superconductivity(SRF2017)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] Measurement of Thin Film Coating on Superconductors2017
- Author(s)
  Y. Iwashita, Y. Fuwa, H. Tongu, H. Hayano, T. Kubo, T. Saeki, M. Hino, H. Oikawa
- Organizer
  8th International Particle Accelerator Conference(IPAC17)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] 薄膜超伝導体の高周波臨界磁場評価のためのニオブ製マッシュルーム型空洞の設計研究2016
- Author(s)
  及川大基，東口武史，岩下芳久，日野正裕，久保毅幸，加藤茂樹，佐伯学行，早野仁司
- Organizer
  第13回日本加速器学会年会
- Place of Presentation
  幕張メッセ国際会議場（千葉県千葉市）
- Year and Date
  2016-08-08
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] Reaching higher gradients in bulk Nb with nano-layer coating2016
- Author(s)
  Takayuki Kubo
- Organizer
  TESLA Technology Collaboration (TTC) meeting
- Place of Presentation
  CEA (Saclay, France)
- Year and Date
  2016-07-05
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] Magnetic fields in bulk, film, and multilayer superconductors in front of a multi-turn coil2016
- Author(s)
  Takayuki Kubo
- Organizer
  the 7th International Particle Accelerator Conference, IPAC16
- Place of Presentation
  Busan (Korea)
- Year and Date
  2016-05-08
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] 超伝導薄膜の特性測定2016
- Author(s)
  岩下芳久，頓宮拓，不破康裕，早野仁司，佐伯学行，久保毅幸
- Organizer
  第13回日本加速器学会年会
- Place of Presentation
  幕張メッセ国際会議場（千葉県千葉市）
- Year and Date
  2016-08-08
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] Construction of Measurement System for Superconducting Characteristics on Thin-film Samples at KEK2016
- Author(s)
  T. Saeki,　H. Hayano,　T. Kubo,　Y. Iwashita,　H. Oikawa
- Organizer
  The seventh International Particle Accelerator Conference(IPAC’16)
- Place of Presentation
  BEXCO Convention Center(Busan, Korea)
- Year and Date
  2016-05-08
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] The Next SRF Technologies2016
- Author(s)
  Takayuki Kubo
- Organizer
  The International Workshop on Future Linear Colliders (LCWS2016)
- Place of Presentation
  Aiina (岩手・盛岡)
- Year and Date
  2016-12-05
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Reaching higher gradients in bulk Nb with nano-layer coating2016
- Author(s)
  Takayuki Kubo
- Organizer
  TESLA Technology Collaboration (TTC) meeting
- Place of Presentation
  Saclay (France)
- Year and Date
  2016-07-05
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Magnetic fields in bulk, film, and multilayer superconductors in front of a multi-turn coil2016
- Author(s)
  Takayuki Kubo
- Organizer
  The seventh International Particle Accelerator Conference(IPAC’16)
- Place of Presentation
  BEXCO Convention Center(Busan, Korea)
- Year and Date
  2016-05-08
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] The next SRF technologies2016
- Author(s)
  Takayuki Kubo
- Organizer
  The International Workshop on Future Linear Colliders (LCWS2016)
- Place of Presentation
  Aiina Center & MALIOS (岩手県盛岡市)
- Year and Date
  2016-12-05
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] EVALUATION OF SC PROPERTY COATED ON A SURFACE2015
- Author(s)
  Y. Iwashita, Y. Fuwa, M. Hino, T. Kubo, T. Saeki
- Organizer
  SRF2015
- Place of Presentation
  Whistler, BC, Canada
- Year and Date
  2015-09-15
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26600142
[Presentation] Theory of multilayer coating for proof-of-concept experiments2015
- Author(s)
  Takayuki Kubo
- Organizer
  the 17th International Conference on RF Superconductivity, SRF 2015, Whistler, Canada (2015)
- Place of Presentation
  Whistler (Canada)
- Year and Date
  2015-09-13
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Theoretical Field Limit and Cavity Surface Conditions: Nano-Scale Topography and Submillimeter Pit2015
- Author(s)
  Takayuki Kubo
- Organizer
  the 17th International Conference on RF Superconductivity, SRF 2015, Whistler, Canada (2015)
- Place of Presentation
  Whistler (Canada)
- Year and Date
  2015-09-13
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Model to explain the role of thermal gradient in flux expulsion efficiency2015
- Author(s)
  Takayuki Kubo
- Organizer
  TESLA Technology Collaboration (TTC) meeting, Menlo Park, CA, USA (2015)
- Place of Presentation
  Menlo Park (USA)
- Year and Date
  2015-12-01
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Model of Flux Trapping in Cooling Down Process2015
- Author(s)
  Takayuki Kubo
- Organizer
  the 17th International Conference on RF Superconductivity, SRF 2015, Whistler, Canada (2015)
- Place of Presentation
  Whistler (Canada)
- Year and Date
  2015-09-13
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Two-dimensional models of the magnetic-field enhancement at pit and bumps
- Author(s)
  Takayuki Kubo
- Organizer
  the 5th International Particle Accelerator Conference, IPAC14
- Place of Presentation
  Dresden, Germany
- Year and Date
  2014-06-15 – 2014-06-20
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Superconducting nano-layer coating without insulator
- Author(s)
  Takayuki Kubo
- Organizer
  the 27th Linear Accelerator Conference, LINAC14
- Place of Presentation
  Geneva, Switzerland
- Year and Date
  2014-08-31 – 2014-09-05
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Review of the multilayer coating model
- Author(s)
  Takayuki Kubo
- Organizer
  the 5th International Particle Accelerator Conference, IPAC14
- Place of Presentation
  Dresden, Germany
- Year and Date
  2014-06-15 – 2014-06-20
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Field limit and nano-defects covering material surface
- Author(s)
  Takayuki Kubo
- Organizer
  TESLA Technology Collaboration (TTC) meeting
- Place of Presentation
  Tsukuba, Japan
- Year and Date
  2014-12-02 – 2014-12-05
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Theory of multilayer coating for proof-of-concept experiments
- Author(s)
  Takayuki Kubo
- Organizer
  the 16th International Conference on RF Superconductivity, SRF2015
- Place of Presentation
  Whistler, BC, Canada
- Year and Date
  2015-09-13 – 2015-09-18
- Invited
- Data Source
  KAKENHI-PROJECT-26800157
[Presentation] Vortex-penetration field at a groove with a depth smaller than the penetration depth
- Author(s)
  Takayuki Kubo
- Organizer
  the 27th Linear Accelerator Conference, LINAC14
- Place of Presentation
  Geneva, Switzerland
- Year and Date
  2014-08-31 – 2014-09-05
- Data Source
  KAKENHI-PROJECT-26800157

1. 佐伯学行 (70282506)

# of Collaborated Projects: 3 results

# of Collaborated Products: 22 results
2. Iwashita Yoshihisa (00144387)

# of Collaborated Projects: 2 results

# of Collaborated Products: 22 results
3. Ryo Katayama (60806959)

# of Collaborated Projects: 2 results

# of Collaborated Products: 4 results
4. 不破康裕 (00817356)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
5. 久保結丸 (20701436)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
6. 井藤隼人 (30881552)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
7. 新田龍海 (60962371)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results

Kubo Takayuki 久保 毅幸

Research Projects

Research Products

Co-Researchers

Superconducting Resonators with High Quality Factors under millikelvin Temperatures and Strong Magnetic Fields

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積層薄膜構造導入による次世代超伝導加速空洞開発のための新成膜手法の開発

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Review Section

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New phase of the study for the next-generation SRF cavity by introducing the artifical thin-film structure

Principal Investigator

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Review Section

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超伝導積層薄膜構造における表面抵抗の磁場強度依存の研究Principal Investigator

Principal Investigator

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Superconducting multilayer-structure for next-generation superconducting-acceleratorsPrincipal Investigator

Principal Investigator

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Measurement of the magnetic field distribution in multilayer superconductorsPrincipal Investigator

Principal Investigator

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Dramatic improvement of superconducting accelerating cavity performance by introduction of laminated thin film structure

Principal Investigator

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[Journal Article] Tuning Critical Field, Critical Current, and Diode Effect of Narrow Thin-Film Superconductors Through Engineering Inhomogeneous Pearl Length2023

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[Journal Article] An Encouraging of Paternity Leave: A Physicist Who Has Become a Stay-at-Home Dad in New York2023

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[Journal Article] Effects of Nonmagnetic Impurities and Subgap States on the Kinetic Inductance, Complex Conductivity, Quality Factor, and Depairing Current Density2022

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[Journal Article] S’IS構造による加速空洞の高性能化に向けたNb3Sn薄膜の成膜プロセス最適化2021

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Journal Title

Data Source

[Journal Article] NbN積層薄膜構造に対する磁束侵入磁場測定2021

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[Journal Article] Depairing Current Density in a Nutshell2021

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Data Source

Kubo Takayuki 久保毅幸

[Journal Article] 超伝導加速空洞の物理と課題、そして性能向上への理論的示唆ー新規参入の誘いー2019

[Journal Article] 超伝導加速空洞の物理と課題、そして性能向上への理論的示唆ー新規参入の誘いー2019