Publications

研究論文のまとめ

2026

  1. Nucl. Fusion
    Plasma pulse induced dust release from tungsten co-deposited layer
    Dogyun Hwangbo, Shin Kajita, Sou Murakami, Yuki Hayashi, Hirohiko Tanaka, and TW Morgan
    Nuclear Fusion 66 (2026) 034002

2025

  1. Sci. Rep.
    Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure
    Dogyun Hwangbo, Shuangyuan Feng, Shin Kajita, Hirohiko Tanaka, Rongshi Zhang, Yuki Hayashi, Maria Morbey, Remco Timmer, Jordy Vernimmen, John Scholten, and Thomas Morgan
    Scientific Reports 15 (2025) 7903
  2. Materialia
    Formation of micro-pillars on W by He plasma irradiation with N2/Ar impurities
    Rongshi Zhang, Shin Kajita, Dogyun Hwangbo, Hirohiko Tanaka, Yuta Yamamoto, and Noriyasu Ohno
    Materialia (2025) 102341
  3. Nucl. Mater. Energy
    Trapping and release of deuterium in helium-induced tungsten fuzz at low temperature
    K Saito, D Hwangbo, M Miyamoto, H Yoshida, R Sasaki, S Murakami, and M Sakamoto
    Nuclear Materials and Energy (2025) 101859
  4. Nucl. Fusion
    Dynamic response of atomic processes in detached helium plasma induced by high-density transient pulse in Magnum-PSI
    Yuki Hayashi, Hirohiko Tanaka, Shin Kajita, Noriyasu Ohno, Dogyun Hwangbo, Jordy Vernimmen, John Scholten, Hennie Johannes Meiden, Ivo GJ Classen, and TW Morgan
    Nuclear Fusion 65 (2025) 086013

2024

  1. Nucl. Mater. Energy
    In-vessel inspection of arc traces on the W7-X plasma facing components after the operation phase OP2.1
    D Hwangbo, CP Dhard, S Kajita, D Naujoks, Y Gao, and others
    Nuclear Materials and Energy (2024) 101846
  2. Nucl. Mater. Energy
    Utilization of D2 molecular band emission for electron density measurement
    D Nishijima, MJ Baldwin, F Chang, D Hwangbo, and GR Tynan
    Nuclear Materials and Energy 41 (2024) 101796
  3. Nucl. Mater. Energy
    Operating voltage of a W-fuzz cathode arc and the mass/charge composition of the arc plasma depending on the fuzz thickness
    SA Barengolts, Yu A Zemskov, DL Shmelev, D Hwangbo, and S Kajita
    Nuclear Materials and Energy (2024) 101727
  4. Nucl. Fusion
    Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components
    O Grulke, C Albert, JA Alcuson Belloso, P Aleynikov, K Aleynikova, A Alonso, G Anda, T Andreeva, M Arvanitou, E Ascasibar, and others
    Nuclear Fusion 64 (2024) 112002

2023

  1. Mater. Res. Express
    Field emission properties of nano-tendril bundles formed via helium plasma exposure with various additional impurity gases
    Rongshi Zhang, Shin Kajita, Dogyun Hwangbo, Hirohiko Tanaka, Shuangyuan Feng, and Noriyasu Ohno
    Materials Research Express 10 (2023) 054002
  2. Nucl. Mater. Energy
    Arc erosion characteristics of W-fuzz samples with different thicknesses of the nanostructured layer
    Sergey A. Barengolts, Dogyun Hwangbo, and Shin Kajita
    Nuclear Materials and Energy 37 (2023) 101541

2022

  1. Plasma Fusion Res.
    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
    Japanese Journal of Applied Physics 62 (2022) SA1007
  2. Plasma Fus. Res.
    Effect of Deuterium Fluence on Deuterium Retention in Tungsten with Fibrous Nanostructured Layer in a Compact Plasma Device APSEDAS
    Takahisa Sakai, Dogyun Hwangbo, Naoki Orikasa, Mikoto Kusumoto, Katsutomo Takatsu, Haru Yoshida, Aoi Fujimori, Ryusei Nitta, and Mizuki Sakamoto
    Plasma and Fusion Research 17 (2022) 2405062–2405062
  3. Nucl. Mater. Energy
    Changes in morphology and field emission property of nano-tendril bundles after high temperature annealing
    Rongshi Zhang, Shin Kajita, Dogyun Hwangbo, Dmitry Sinelnikov, Hirohiko Tanaka, and Noriyasu Ohno
    Nuclear Materials and Energy 31 (2022) 101178

2021

  1. J. Plasma Fusion Res.
    Status and prospects of arcing in the magnetic confinement fusion studies
    Dogyun Hwangbo
    Journal of Plasma and Fusion Research (Japanese) 97 (2021) 221–228
  2. Vacuum
    Nano-tendril bundles behavior under plasma-relevant electric fields
    VV Kulagin, DN Sinelnikov, DG Bulgadaryan, NE Efimov, VA Kurnaev, D Hwangbo, N Ohno, and S Kajita
    Vacuum 183 (2021) 109799
  3. Plasma Fusion Res.
    Observation of Arc Trails with Significant Damage due to Glow Discharge Wall Conditioning in the Large Helical Device
    Yuki Hayashi, Suguru Masuzaki, Gen Motojima, Dogyun Hwangbo, Yutaka Fujiwara, Mingzhong Zhao, LHD Experiment Group, and others
    Plasma and Fusion Research 16 (2021) 1202061–1202061
  4. Phys. Scr.
    Plasma-wall interaction studies in W7-X: main results from the recent divertor operations
    CP Dhard, S Brezinsek, M Mayer, D Naujoks, S Masuzaki, D Zhao, R Yi, J Oelmann, K Schmid, J Romazanov, and others
    Physica Scripta 96 (2021) 124059
  5. Plasma Fusion Res.
    Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX
    Hiroki Gamo, Naomichi Ezumi, Tsukasa Sugiyama, Kunpei Nojiri, Ayane Kondo, Mafumi Hirata, Junko Kohagura, Masayuki Yoshikawa, Yousuke Nakashima, Dogyun Hwangbo, and others
    Plasma and Fusion Research 16 (2021) 2402041–2402041
  6. Plasma Fusion Res.
    Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases
    Rongshi Zhang, Shin Kajita, Dogyun Hwangbo, Hirohiko Tanaka, and Noriyasu Ohno
    Plasma and Fusion Research 16 (2021) 2405069–2405069
  7. J. Nucl. Mater
    The effects of impurity gas seeding on the growth of fuzzy tungsten
    Patrick McCarthy, Dogyun Hwangbo, Shin Kajita, and James W Bradley
    Journal of Nuclear Materials 556 (2021) 153125

2020

  1. Plasma Fusion Res.
    Inspection of Arc Trails formed in stellarator/heliotron devices W7-X and LHD
    Dogyun Hwangbo, Shin Kajita, Chandra Prakash Dhard, Masayuki Tokitani, Marco Krause, Dirk Naujoks, Suguru Masuzaki, Sören Klose, Noriyasu Ohno, and others
    Plasma and Fusion Research 15 (2020) 2402012–2402012
  2. Plasma Sources Sci. Technol.
    Unipolar arc plasmas on nanostructured tungsten surfaces under perpendicular magnetic field
    Dogyun Hwangbo, Daisuke Nishijima, Shin Kajita, Russell P Doerner, and Noriyasu Ohno
    Plasma Sources Science and Technology 29 (2020) 125015
  3. Phys. Scr.
    Inspection of W7-X plasma-facing components after the operation phase OP1.2b: observations and first assessments
    CP Dhard, S Äkäslompolo, M Balden, J Baldzuhn, C Biedermann, T Bräuer, S Brezinsek, M Endler, Y Hayashi, D Hwangbo, and others
    Physica Scripta 2020 (2020) 014033
  4. Nucl. Fusion
    Enhanced fuzzy tungsten growth in the presence of tungsten deposition
    Patrick McCarthy, Dogyun Hwangbo, Matthew Bilton, Shin Kajita, and James W Bradley
    Nuclear Fusion 60 (2020) 026012
  5. Nucl. Fusion
    Dynamics of the changes in the parameters of the arc plasma during the destruction of a helium-induced tungsten fuzz by arc pulses
    SA Barengolts, D Hwangbo, S Kajita, N Ohno, VP Frolova, AG Nikolaev, EM Oks, DL Shmelev, MM Tsventoukh, and G Yu Yushkov
    Nuclear Fusion 60 (2020) 044001
  6. Phys. Scr.
    Helium irradiation effects on the surface modification and recrystallization of tungsten
    Aneeqa Khan, Gregory De Temmerman, Shin Kajita, Henri Greuner, M Balden, K Hunger, N Ohno, D Hwangbo, Y Tomita, M Tokitani, and others
    Physica Scripta 2020 (2020) 014050
  7. Nucl. Mater. Energy
    Size distribution of nano-tendril bundles with various additional impurity gases
    Rongshi Zhang, Dogyun Hwangbo, Shin Kajita, Hirohiko Tanaka, and Noriyasu Ohno
    Nuclear Materials and Energy 25 (2020) 100843

2019

  1. IEEE TPS
    Ignition and sustainment of arcing on nanostructured tungsten under plasma exposure
    Dogyun Hwangbo, Daisuke Nishijima, Shin Kajita, Russell P Doerner, Sergey A Barengolts, Mikhail M Tsventoukh, Hirohiko Tanaka, and Noriyasu Ohno
    IEEE Transactions on Plasma Science 47 (2019) 3617–3625
  2. Nucl. Mater. Energy
    Growth process of nano-tendril bundles with sputtered tungsten
    Dogyun Hwangbo, Shin Kajita, Hirohiko Tanaka, and Noriyasu Ohno
    Nuclear Materials and Energy 18 (2019) 250–257
  3. Nucl. Mater. Energy
    Influence of heavier impurity deposition on surface morphology development and sputtering behavior explored in multiple linear plasma devices
    D Nishijima, A Kreter, MJ Baldwin, D Borodin, A Eksaeva, D Hwangbo, S Kajita, M Miyamoto, N Ohno, M Patino, and others
    Nuclear materials and energy 18 (2019) 67–71
  4. IEEE TPS
    Ignition and behavior of arc spots on helium irradiated tungsten under fusion relevant condition
    Shin Kajita, Dogyun Hwangbo, and Noriyasu Ohno
    IEEE Transactions on Plasma Science 47 (2019) 3609–3616
  5. IEEE TPS
    Field emission from nanostructured tendril bundles
    Dmitry Sinelnikov, Daniel Bulgadaryan, Dogyun Hwangbo, Shin Kajita, Valery Kurnaev, and Noriyasu Ohno
    IEEE Transactions on Plasma Science 47 (2019) 5186–5190

2018

  1. Contrib. Plasma Phys.
    Ignition and erosion of materials by arcing in fusion-relevant conditions
    Dogyun Hwangbo, Shin Kajita, Sergey A Barengolts, Mikhail M Tsventoukh, Shota Kawaguchi, Vadim G Mesyats, and Noriyasu Ohno
    Contributions to Plasma Physics 58 (2018) 608–615
  2. Nucl. Fusion
    Growth of nano-tendril bundles on tungsten with impurity-rich He plasmas
    Dogyun Hwangbo, Shin Kajita, Noriyasu Ohno, Patrick McCarthy, James W Bradley, and Hirohiko Tanaka
    Nuclear Fusion 58 (2018) 096022
  3. Plasma. Fusion Res.
    Pulsation effects of incident ion energy on W fuzz growth
    Shin Kajita, Shota Kawaguchi, Dogyun Hwangbo, Hirohiko Tanaka, and Noriyasu Ohno
    Plasma and Fusion Research 13 (2018) 1205001–1205001
  4. Nucl. Instrum. Methods Phys. Res. B
    Proton scattering from tungsten fuzz
    D Bulgadaryan, D Sinelnikov, V Kurnaev, S Kajita, D Hwangbo, and N Ohno
    Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 434 (2018) 9–12
  5. IEEE TPS
    Effect of the nanostructured layer thickness on the dynamics of cathode spots on tungsten
    Sergey A Barengolts, Vadim G Mesyats, Mikhail M Tsventoukh, Shin Kajita, Dogyun Hwangbo, and Noriyasu Ohno
    IEEE Transactions on Plasma Science 46 (2018) 4044–4050

2017

  1. Nucl. Mater. Energy
    Erosion of nanostructured tungsten by laser ablation, sputtering and arcing
    Dogyun Hwangbo, Shota Kawaguchi, Shin Kajita, and Noriyasu Ohno
    Nuclear Materials and Energy 12 (2017) 386–391
  2. IEEE TPS
    Field emission from metal surfaces irradiated with helium plasmas
    Dogyun Hwangbo, Shin Kajita, Noriyasu Ohno, and Dmitry Sinelnikov
    IEEE Transactions on Plasma Science 45 (2017) 2080–2086

2016

  1. Sci. Rep.
    Fuzzy nanostructure growth on Ta/Fe by He plasma irradiation
    Shin Kajita, Tomoya Ishida, Noriyasu Ohno, Dogyun Hwangbo, and Tomoko Yoshida
    Scientific Reports 6 (2016) 30380
  2. J. Phys. Conf. Ser.
    Arc tracks on nanostructured surfaces after microbreakdowns
    D Sinelnikov, D Bulgadaryan, Dogyun Hwangbo, S Kajita, D Kolodko, V Kurnaev, and N Ohno
    Journal of Physics: Conference Series 748 (2016) 012012

2014

  1. Results Phys.
    Transition in velocity and grouping of arc spot on different nanostructured tungsten electrodes
    Dogyun Hwangbo, Shin Kajita, Sergey A Barengolts, Mikhail M Tsventoukh, and Noriyasu Ohno
    Results in Physics 4 (2014) 33–39
  2. J. Appl. Phys.
    Arc spot grouping: An entanglement of arc spot cells
    Shin Kajita, Dogyun Hwangbo, Noriyasu Ohno, Mikhail M Tsventoukh, and Sergey A Barengolts
    Journal of Applied Physics 116 (2014)

2013

  1. Jpn. J. Appl. Phys.
    Spectroscopic study and motion analysis of arc spot initiated on nanostructured tungsten
    Dogyun Hwangbo, Shin Kajita, Masashi Osaka, and Noriyasu Ohno
    Japanese Journal of Applied Physics 52 (2013) 11NC02