Conferences

学生・教員による会議発表成果のまとめ

2025

  1. IPTJC
    Tungsten surface changes under divertor relevant environments and their responses to high-density plasma exposures
    Dogyun Hwangbo, Kajita Shin, Yuki Hayashi, Hirohiko Tanaka, and Thomas Morgan
    In The International Plasma Technology Joint Conference 2025 (IPTJC2025), Jun 2025
  2. OS
    Fabrication of tungsten co-deposited layers with deuterium and helium plasma exposures
    Dogyun Hwangbo, Kajita Shin, Maria Sakamoto, Takuto Okugi, and Mizuki Sakamoto
    In 14th International Conference on Open Magnetic Systems for Plasma Confinement (OS2025), Sep 2025
  3. OS
    Preparation of deuterium-tungsten co-deposited layer suitable for STEM-EELS analysis
    Kota Saito, Dogyun Hwangbo, Takuto Okugi, Maria Sakamoto, and Mizuki Sakamoto
    In 14th International Conference on Open Magnetic Systems for Plasma Confinement (OS2025), Sep 2025
  4. OS
    The relationship between D-Ar plasma exposure conditions, W-D co-deposited structural properties, and D absorption properties
    Takuto Okugi, Dogyun Hwangbo, Kota Saito, Ryo Sasaki, and Mizuki Sakamoto
    In 14th International Conference on Open Magnetic Systems for Plasma Confinement (OS2025), Sep 2025
  5. OS
    Effect of DC+RF combined biasing on surface structural changes of tungsten induced by pure helium plasma irradiation
    Yukiya Numata, Dogyun Hwangbo, Kota Saito, Maria Sakamoto, Takuto Okugi, and Mizuki Sakamoto
    In 14th International Conference on Open Magnetic Systems for Plasma Confinement (OS2025), Sep 2025
  6. OS
    Deuterium retention in He-W co-deposited layers: analysis of temperature effects
    Maria Sakamoto, Dogyun Hwangbo, Kota Saito, Ryo Sasaki, Takuto Okugia, Aoi Kataniwa, and Mizuki Sakamoto
    In 14th International Conference on Open Magnetic Systems for Plasma Confinement (OS2025), Sep 2025
  7. OS
    Effect of controlling the termination plate potential on mode transitions in RF plasmas of APSEDAS
    Hana Kida, Dogyun Hwangbo, Noriyasu Ohno, Yuta Kinashi, Takumi Seto, Naomichi Ezumi, Mafumi HIrata, and Mizuki Sakamoto
    In 14th International Conference on Open Magnetic Systems for Plasma Confinement (OS2025), Sep 2025
  8. OS
    Separation of He-W Co-deposited Layers on NaCl Substrate with Evaluation of Structural Properties and Deuterium Retention
    Aoi Kataniwa, Dogyun Hwangbo, Kota Saito, Ryo Sasaki, Takuto Okugi, and Mizuki Sakamoto
    In 14th International Conference on Open Magnetic Systems for Plasma Confinement (OS2025), Sep 2025
  9. IFCRM
    Deuterium retention properties of He-W co-deposited layers formed at different sample temperature and flux ratio of W to He
    Maria Sakamoto, Dogyun Hwangbo, Kota Saito, Haru Yoshida, Ryo Sasaki, Sou Murakami, Takuto Okugi, Aoi Kataniwa, and Mizuki Sakamoto
    In 22nd International Conference on Fusion Reactor Materials (IFFRM-22), Sep 2025
  10. IFCRM
    Comparison of deuterium desorption from tungsten fuzz between multiple plasma devices
    Kota Saito, Dogyun Hwangbo, Daisuke Nishijima, Anže Založnik, Maria Sakamoto, Takuto Okugi, Matthew Baldwin, and Mizuki Sakamoto
    In 22nd International Conference on Fusion Reactor Materials (IFFRM-22), Sep 2025
  11. Tsukuba Conf.
    Paradigm shift for Fusion Energy development: Role of university and young scientists
    Dogyun Hwangbo
    In Tsukuba Conference 2025, Oct 2025
  12. JAGFoS
    Unipolar arc ignition on nanostructured tungsten in nuclear fusion-relevant conditions
    Dogyun Hwangbo
    In 6th Japanese-American-German Kavli Frontiers of Science Symposium, Oct 2025

2024

  1. PSI
    In-vessel inspection of W7-X after the first operation with actively cooled CFC divertor
    CP Dhard, M Endler, M Balden, S Brezinsek, T Dittmar, J Fellinger, Y Gao, D Hartmann, Dogyun Hwangbo, M Jakubowski, and others
    In 26th International Conference on Plasma Surface Interaction in Controlled Fusion Devices (PSI-26), May 2024
  2. PSI
    In-vessel inspection of arc traces on the W7-X plasma facing components after the operation phase OP2.1
    Dogyun Hwangbo, CP Dhard, S Kajita, D Naujoks, and others
    In 26th International Conference on Plasma Surface Interaction in Controlled Fusion Devices (PSI-26), May 2024
  3. PSI
    Trapping and release of deuterium in helium-induced tungsten fuzz at low temperature
    K Saito, Dogyun Hwangbo, M Miyamoto, H Yoshida, R Sasaki, S Murakami, and M Sakamoto
    In 26th International Conference on Plasma Surface Interaction in Controlled Fusion Devices (PSI-26), May 2024
  4. AAPPS-DPP
    Plasma-wall interaction, exhaust and wall conditioning studies in the stellarator Wendelstein 7-X with actively cooled high heat flux divertor and experiments with tungsten PFCs
    CP Dhard, M Balden, T Bräuer, S Brezinsek, T Dittmar, V Haak, Dogyun Hwangbo, S Kajita, C Kawan, A Knieps, and others
    In 8th Asia-Pacific Conference on Plasma Physics (AAPPS-DPP 2024), Nov 2024
  5. AAPPS-DPP
    Global observation and potential effects of arc traces in fusion devices
    Dogyun Hwangbo, Chandra Prakash Dhard, Gen Motojima, Yuki Hayashi, Masayuki Tokitani, S Kajita, S Masuzaki, D Naujoks, and others
    In 8th Asia-Pacific Conference on Plasma Physics (AAPPS-DPP 2024), Nov 2024

2023

  1. ISDEIV
    Arc ignition and hot spot formation on tungsten with nano-tendril bundles under hydrogen plasma exposure
    Dogyun Hwangbo, Shuangyuan Feng, Rongshi Zhang, Shin Kajita, MD Maria Cunha, Remco Timmer, Jordy Vernimmen, John Scholten, Hirohiko Tanaka, Yuki Hayashi, and others
    In 2023 30th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), Jun 2023
  2. ISDEIV
    Field emission current from protrusion structures formed by helium plasma with various impurity gases
    Rongshi Zhang, Shin Kajita, Hirohiko Tanaka, Dogyun Hwangbo, and Noriyasu Ohno
    In 30th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), Jun 2023
  3. GPF
    Spectroscopic measurement of deuterium recycling at molybdenum surfaces
    Dogyun Hwangbo and Daisuke Nishijima
    In Global Plasma Forum in Aomori, Oct 2023
  4. PMIF
    Present Status of a Pilot GAMMA PDX-SC project
    Mizuki Sakamoto, T. Kariya, M. Yoshikawa, N. Ezumi, R. Minami, M. HIrata., J. Kohagura, T. Numakura, S. Togo, D. Hwangbo, K. Emoto, A. Sugiyama, Y. Washo, Y. Endo, Y. Shima, K. Ookawa, I. Katanuma, Y. Nakashima, T. Imai, M. Ichimura, and B. Unterberg
    In 8th International Workshop on Plasma Material Interaction Facilities for Fusion Research (PMIF2023), Oct 2023
  5. iFPC&OS
    Contribution of Mirror Devices in Tsukuba to Fusion Energy Development
    Mizuki Sakamoto, T. Kariya, M. Yoshikawa., N. Ezumi, R. Minami, M. Hirata, J. Kohagura, T. Numakura, S. Togo, D. HWangbo, I. Katanuma, Y. Nakashima, T. Imai, M. Ichimura, and B. Unterberg
    In 2nd International Fusion and Plasma Conference & 13th International Conference on Open Magnetic Systems for Plasma Confinement (iFPC & OS2023), Aug 2023
  6. ISDEIV
    Overheating of Nanostructured Tendril Bundles due to Thermo-Field Emission
    Dmitry Sinelnikov, Daniel Bulgadaryan, Nikita Efimov, Dogyun Hwangbo, Vladimi Kulagin, Valery Kurnaev, Shin Kajita, and Noriyasu Ohno
    In 29th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV), Jun 2023
  7. FEC
    Design, Construction and First Operation of Pilot GAMMA PDX-SC Superconducting Mirror Device
    Mizuki Sakamoto, Tsuyoshi Kariya, Masayuki Yoshikawa, Naomichi Ezumi, R. Minami, M. Hirata, J. Kohagura, T. Numakura, Togo. S., D. Hwangbo, A. Sugiyama, Y. Washo., Y. Endo, Shima. Y., K. Ookawa, I. Katanuma, Y. Nakashima, T. Imai, and M. Ichimura
    In 29th IAEA Fusion Energy Conference (FEC 2023), Oct 2023
  8. PFMC
    Formation of He-W co-deposition layer on W surface and its effect on deuterium retention properties
    D. Hwangbo, K. Takatsu, K. Saito, M. Kusumoto, R. Sasaki, S. Murakami, H. Yoshida, K. Onoda, and M. Sakamoto
    In 19th International Conference on Plasma-Facing Materials and Components for Fusion Applications (PFMC-19), May 2023
  9. PFMC
    Investigation of low temperature desorption peaks of deuterium and helium in tungsten nanostructured layers
    K. Saito, D. Hwangbo, K. Takatsu, M. Kusumoto, H. Yoshida, K. Onoda, R. Sasaki, S. Murakami, and M. Sakamoto
    In 19th International Conference on Plasma-Facing Materials and Components for Fusion Applications (PFMC-19), May 2023

2022

  1. PSI
    Spatiotemporal observation of N-MAR in GAMMA 10/PDX
    Naomichi Ezumi, H. Gamo, S. Takahashi, T. Sugiyama, T. Okamoto, N. Shigematsu, K. Takanashi, A. Kondo, T. Seto, S. Togo, M. Hirata, D. Hwangbo, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, N. Ohno, K. Sawada, and S. Masuzaki
    In 25th International Conference on Plasma Surface Interaction in Controlled Fusion Devices (PSI-25), Jun 2022
  2. PSI
    Hydrogen recycling near fuzz tungsten surfaces under high-vacuum background condition
    Dogyun Hwangbo, T. Sugiyama, M. Sakamoto, H. Gamo, A. Kondo, T. Sakai, N. Ezumi, Y. Nakashima, S. Togo, M. Hirata, M. Yoshikawa, J. Kohagura, T. Kariya, R. Minami, and T. Numakura
    In 25th International Conference on Plasma Surface Interaction in Controlled Fusion Devices (PSI-25), Jun 2022

2021

  1. ITC
    Effect of helium pre-exposure on deuterium retention of tungsten in a compact plasma device APSEDAS
    Takahisa Sakai, Mizuki Sakamoto, Dogyun Hwangbo, Naoki Orikasa, Mikoto Kusumoto, Katsutomo Takatsu, Haru Yoshida, Ryusei Nitta, and Aoi Fujimori
    In The 30th International Toki Conference on Plasma and Fusion Research (ITC-30), Nov 2021
  2. OS mini-workshop
    Present status of GAMMA 10/PDX and a new project of a superconducting mirror machine
    Mizuki Sakamoto, Tsuyoshi Kariya, Masayuki Yoshikawa, Naomichi Ezumi, Ryutaro Minami, Mafumi Hirata, Junko Kohagura, T. Numakura, S. Togo, D. Hwangbo, I. Katanuma, Yousuke Nakashima, T. Imai, Makoto Ichimura, and B. Unterberg
    In International Mini-Workshop on Open Magnetic Systems for Plasma Confinement (OS2021), Aug 2021
  3. AAPPS-DPP
    Hydrogen recycling study using a high temperature target in GAMMA 10/PDX tandem mirror
    Mizuki Sakamoto, Y. Miyake, H. Gamo, T. Sugiyama, A. Kondo, N. Shigematsu, T. Seto, K. Nojiri, Yousuke Nakashima, D. Hwangbo, S. Togo, Junko Kohagura, Mafumi Hirata, Naomichi Ezumi, and Masayuki Yoshikawa
    In 5th Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2021), Sep 2021
  4. GDT-FNS
    Recent results of GAMMA 10/PDX and construction of a superconducting mirror machine
    Mizuki Sakamoto, Tsuyoshi Kariya, Masayuki Yoshikawa, Naomichi Ezumi, Ryutaro Minami, Mafumi Hirata, Junko Kohagura, T. Numakura, S. Togo, D. Hwangbo, I. Katanuma, Yousuke Nakashima, T. Imai, Makoto Ichimura, and B. Unterberg
    In 3rd International Workshop on Gas Dynamic Trap based Fusion Neutron Source (GDT-FNS), Sep 2021
  5. ISPlasma
    Motion analysis of arc spots on tungsten fuzz by means of self-avoiding random walk model
    Dogyun Hwangbo, Daisuke Nishijima, Shin Kajita, and Noriyasu Ohno
    In 14th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials, Mar 2021

2020

  1. ITC
    Influence of nitrogen ratio during combined seeding with hydrogen on plasma detachment in the divertor simulation experimental module of GAMMA 10/PDX
    Hiroki GAMO, Naomichi Ezumi, Tsukasa SUGIYAMA, Kunpei NOJIRI, Ayane KONDO, Mafumi HIRATA, Junko KOHAGURA, Masayuki YOSHIKAWA, Yousuke NAKASHIMA, Dogyun HWANGBO, Mizuki SAKAMOTO, Renato PERILLO, Tatsuya KUWABARA, Hirohiko TANAKA, Noriyasu OHNO, Keiji SAWADA, Akira TONEGAWA, and Suguru MASUZAKI
    In The 29th International Toki Conference on Plasma and Fusion Research (ITC-29), Oct 2020
  2. ITC
    Effects of V-shaped target angle on plasma behavior in the GAMMA 10/PDX divertor simulation experimental module
    Tsukasa SUGIYAMA, Naomichi Ezumi, Hiroki GAMO, Kunpei NOJIRI, Ayane KONDO, Mafumi HIRATA, Masayuki YOSHIKAWA, Dogyun HWANGBO, Houyang GUO, Junko KOHAGURA, Yousuke NAKASHIMA, Mizuki SAKAMOTO, Tatsuya KUWABARA, Hirohiko TANAKA, Noriyasu OHNO, Keiji SAWADA, Akira TONEGAWA, Suguru MASUZAKI, and Gakushi KAWAMURA
    In The 29th International Toki Conference on Plasma and Fusion Research (ITC-29), Oct 2020
  3. ITC
    Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases
    Rongshi Zhang, Shin Kajita, Dogyun Hwangbo, Hirohiko Tanaka, and Noriyasu Ohno
    In 29th International Toki Conference on Plasma and Fusion Research (ITC), Oct 2020
  4. ISPlasma
    Motion analysis of arc spots on nanostructured tungsten under axial magnetic field
    Dogyun Hwangbo, D. Nishijima, S. Kajita, R.P. Doerner, and N. Ohno
    In 13th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials, Mar 2020

2019

  1. ITC
    Inspection of arc trails formed in stellarator/heliotron devices W7-X and LHD
    Dogyun Hwangbo, S. Kajita, C. P. Dhard, M. Tokitani, M. Krause, D. Naujoks, S. Masuzaki, N. Ohno, and S. Klose
    In The 28th International Toki Conference on Plasma and Fusion Research (ITC-28), Nov 2019
  2. ICPIG
    Arc behavior on tungsten nanostructure under helium plasma exposure
    Dogyun Hwangbo, D. Nishijima, S. Kajita, R.P. Doerner, N. Ohno, and H. Tanaka
    In 34th International Conference on Phenomena in ionized Gases (ICPIG), Jul 2019