@article{hwangbo2026plasma,title={Plasma pulse induced dust release from tungsten co-deposited layer},author={Hwangbo, Dogyun and Kajita, Shin and Murakami, Sou and Hayashi, Yuki and Tanaka, Hirohiko and Morgan, TW},journal={Nuclear Fusion},volume={66},pages={034002},year={2026},publisher={IOP Publishing},doi={10.1088/1741-4326/ae3c34},dimensions={true},}
D. Hwangbo, S. Kajita, S. Murakami, Y. Hayashi, H. Tanaka, T. Morgan, "Plasma pulse induced dust release from tungsten co-deposited layer," Nuclear Fusion 66 (2026) 034002.
https://doi.org/10.1088/1741-4326/ae3c34
2025
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
@article{hwangbo2025formation,title={Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure},author={Hwangbo, Dogyun and Feng, Shuangyuan and Kajita, Shin and Tanaka, Hirohiko and Zhang, Rongshi and Hayashi, Yuki and Morbey, Maria and Timmer, Remco and Vernimmen, Jordy and Scholten, John and Morgan, Thomas},journal={Scientific Reports},volume={15},number={1},pages={7903},year={2025},publisher={Nature Publishing Group UK London},doi={10.1038/s41598-025-92412-y},dimensions={true},}
D. Hwangbo, S. Feng, S. Kajita, H. Tanaka, R. Zhang, Y. Hayashi, M. Morbey, R. Timmer, J. Vernimmen, J. Scholten, T. Morgan, "Formation of hot spots and arc ignition on tungsten with nano-tendril bundles under high-density hydrogen plasma exposure," Scientific Reports 15 (2025) 7903.
https://doi.org/10.1038/s41598-025-92412-y
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
@article{zhang2025formation,title={Formation of micro-pillars on W by He plasma irradiation with N2/Ar impurities},author={Zhang, Rongshi and Kajita, Shin and Hwangbo, Dogyun and Tanaka, Hirohiko and Yamamoto, Yuta and Ohno, Noriyasu},journal={Materialia},pages={102341},volum={39},year={2025},publisher={Elsevier},doi={10.1016/j.mtla.2025.102341},dimensions={true},}
R. Zhang, S. Kajita, D. Hwangbo, H. Tanaka, Y. Yamamoto, N. Ohno, "Formation of micro-pillars on W by He plasma irradiation with N2/Ar impurities," Materialia (2025) 102341.
https://doi.org/10.1016/j.mtla.2025.102341
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
@article{saito2025trapping,title={Trapping and release of deuterium in helium-induced tungsten fuzz at low temperature},author={Saito, K and Hwangbo, D and Miyamoto, M and Yoshida, H and Sasaki, R and Murakami, S and Sakamoto, M},journal={Nuclear Materials and Energy},pages={101859},year={2025},publisher={Elsevier},doi={10.1016/j.nme.2024.101859},dimensions={true},}
K. Saito, D. Hwangbo, M. Miyamoto, H. Yoshida, R. Sasaki, S. Murakami, M. Sakamoto, "Trapping and release of deuterium in helium-induced tungsten fuzz at low temperature," Nuclear Materials and Energy (2025) 101859.
https://doi.org/10.1016/j.nme.2024.101859
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
@article{hayashi2025dynamic,title={Dynamic response of atomic processes in detached helium plasma induced by high-density transient pulse in Magnum-PSI},author={Hayashi, Yuki and Tanaka, Hirohiko and Kajita, Shin and Ohno, Noriyasu and Hwangbo, Dogyun and Vernimmen, Jordy and Scholten, John and van der Meiden, Hennie Johannes and Classen, Ivo GJ and Morgan, TW},journal={Nuclear Fusion},volume={65},pages={086013},year={2025},publisher={IOP Publishing},doi={10.1088/1741-4326/adeac4},dimensions={true},}
Y. Hayashi, H. Tanaka, S. Kajita, N. Ohno, D. Hwangbo, J. Vernimmen, J. Scholten, H. Meiden, I. Classen, T. Morgan, "Dynamic response of atomic processes in detached helium plasma induced by high-density transient pulse in Magnum-PSI," Nuclear Fusion 65 (2025) 086013.
https://doi.org/10.1088/1741-4326/adeac4
2024
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
@article{hwangbo2024vessel,title={In-vessel inspection of arc traces on the W7-X plasma facing components after the operation phase OP2.1},author={Hwangbo, D and Dhard, CP and Kajita, S and Naujoks, D and Gao, Y and others},journal={Nuclear Materials and Energy},pages={101846},year={2024},publisher={Elsevier},doi={10.1016/j.nme.2024.101846},dimensions={true},}
D. Hwangbo, C. Dhard, S. Kajita, D. Naujoks, Y. Gao, . others, "In-vessel inspection of arc traces on the W7-X plasma facing components after the operation phase OP2.1," Nuclear Materials and Energy (2024) 101846.
https://doi.org/10.1016/j.nme.2024.101846
Nucl. Mater. Energy
Utilization of D2 molecular band emission for electron density measurement
D Nishijima, MJ Baldwin, F Chang, D Hwangbo, and GR Tynan
@article{nishijima2024utilization,title={Utilization of D2 molecular band emission for electron density measurement},author={Nishijima, D and Baldwin, MJ and Chang, F and Hwangbo, D and Tynan, GR},journal={Nuclear Materials and Energy},volume={41},pages={101796},year={2024},publisher={Elsevier},doi={10.1016/j.nme.2024.101796},dimensions={true},}
D. Nishijima, M. Baldwin, F. Chang, D. Hwangbo, G. Tynan, "Utilization of D2 molecular band emission for electron density measurement," Nuclear Materials and Energy 41 (2024) 101796.
https://doi.org/10.1016/j.nme.2024.101796
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
@article{barengolts2024operating,title={Operating voltage of a W-fuzz cathode arc and the mass/charge composition of the arc plasma depending on the fuzz thickness},author={Barengolts, SA and Zemskov, Yu A and Shmelev, DL and Hwangbo, D and Kajita, S},journal={Nuclear Materials and Energy},pages={101727},year={2024},publisher={Elsevier},doi={10.1016/j.nme.2024.101727},dimensions={true},}
S. Barengolts, Y. Zemskov, D. Shmelev, D. Hwangbo, S. Kajita, "Operating voltage of a W-fuzz cathode arc and the mass/charge composition of the arc plasma depending on the fuzz thickness," Nuclear Materials and Energy (2024) 101727.
https://doi.org/10.1016/j.nme.2024.101727
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
@article{grulke2024overview,title={Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components},author={Grulke, O and Albert, C and Belloso, JA Alcuson and Aleynikov, P and Aleynikova, K and Alonso, A and Anda, G and Andreeva, T and Arvanitou, M and Ascasibar, E and others},journal={Nuclear Fusion},volume={64},number={11},pages={112002},year={2024},publisher={IOP Publishing},doi={10.1088/1741-4326/ad2f4d},dimensions={true},}
O. Grulke, C. Albert, J. Belloso, P. Aleynikov, K. Aleynikova, A. Alonso, G. Anda, T. Andreeva, M. Arvanitou, E. Ascasibar, . others, "Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components," Nuclear Fusion 64 (2024) 112002.
https://doi.org/10.1088/1741-4326/ad2f4d
2023
Mater. Res. Express
Field emission properties of nano-tendril bundles formed via helium plasma exposure with various additional impurity gases
@article{zhang2023field,title={Field emission properties of nano-tendril bundles formed via helium plasma exposure with various additional impurity gases},author={Zhang, Rongshi and Kajita, Shin and Hwangbo, Dogyun and Tanaka, Hirohiko and Feng, Shuangyuan and Ohno, Noriyasu},journal={Materials Research Express},volume={10},number={5},pages={054002},year={2023},publisher={IOP Publishing},doi={10.1088/2053-1591/acd1d4},dimensions={true},}
R. Zhang, S. Kajita, D. Hwangbo, H. Tanaka, S. Feng, N. Ohno, "Field emission properties of nano-tendril bundles formed via helium plasma exposure with various additional impurity gases," Materials Research Express 10 (2023) 054002.
https://doi.org/10.1088/2053-1591/acd1d4
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
@article{barengolts2023arc,title={Arc erosion characteristics of {W-fuzz} samples with different thicknesses of the nanostructured layer},author={Barengolts, Sergey A. and Hwangbo, Dogyun and Kajita, Shin},journal={Nuclear Materials and Energy},volume={37},pages={101541},year={2023},publisher={Elsevier},doi={10.1016/j.nme.2023.101541},dimensions={true},}
S. Barengolts, D. Hwangbo, S. Kajita, "Arc erosion characteristics of W-fuzz samples with different thicknesses of the nanostructured layer," Nuclear Materials and Energy 37 (2023) 101541.
https://doi.org/10.1016/j.nme.2023.101541
2022
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 Physics62 (2022) SA1007
@article{hwangbo2022motion,title={Motion analysis of arc spots on tungsten fuzz by means of self-avoiding random walk model},author={Hwangbo, Dogyun and Nishijima, Daisuke and Kajita, Shin and Ohno, Noriyasu},journal={Japanese Journal of Applied Physics},volume={62},number={SA},pages={SA1007},year={2022},publisher={IOP Publishing},doi={10.35848/1347-4065/ac79fe},dimensions={true},}
D. Hwangbo, D. Nishijima, S. Kajita, N. Ohno, "Motion analysis of arc spots on tungsten fuzz by means of self-avoiding random walk model," Japanese Journal of Applied Physics 62 (2022) SA1007.
https://doi.org/10.35848/1347-4065/ac79fe
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 Research17 (2022) 2405062–2405062
@article{sakai2022effect,title={Effect of Deuterium Fluence on Deuterium Retention in Tungsten with Fibrous Nanostructured Layer in a Compact Plasma Device {APSEDAS}},author={Sakai, Takahisa and Hwangbo, Dogyun and Orikasa, Naoki and Kusumoto, Mikoto and Takatsu, Katsutomo and Yoshida, Haru and Fujimori, Aoi and Nitta, Ryusei and Sakamoto, Mizuki},journal={Plasma and Fusion Research},volume={17},pages={2405062--2405062},year={2022},publisher={The Japan Society of Plasma Science and Nuclear Fusion Research},doi={10.1585/pfr.17.2405062},dimensions={true},}
T. Sakai, D. Hwangbo, N. Orikasa, M. Kusumoto, K. Takatsu, H. Yoshida, A. Fujimori, R. Nitta, M. Sakamoto, "Effect of Deuterium Fluence on Deuterium Retention in Tungsten with Fibrous Nanostructured Layer in a Compact Plasma Device APSEDAS," Plasma and Fusion Research 17 (2022) 2405062–2405062.
https://doi.org/10.1585/pfr.17.2405062
Nucl. Mater. Energy
Changes in morphology and field emission property of nano-tendril bundles after high temperature annealing
@article{zhang2022changes,title={Changes in morphology and field emission property of nano-tendril bundles after high temperature annealing},author={Zhang, Rongshi and Kajita, Shin and Hwangbo, Dogyun and Sinelnikov, Dmitry and Tanaka, Hirohiko and Ohno, Noriyasu},journal={Nuclear Materials and Energy},volume={31},pages={101178},year={2022},publisher={Elsevier},doi={10.1016/j.nme.2022.101178},dimensions={true},}
R. Zhang, S. Kajita, D. Hwangbo, D. Sinelnikov, H. Tanaka, N. Ohno, "Changes in morphology and field emission property of nano-tendril bundles after high temperature annealing," Nuclear Materials and Energy 31 (2022) 101178.
https://doi.org/10.1016/j.nme.2022.101178
2021
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
@article{hwangbo2021status,title={Status and prospects of arcing in the magnetic confinement fusion studies},author={Hwangbo, Dogyun},journal={Journal of Plasma and Fusion Research (Japanese)},volume={97},number={4},pages={221--228},year={2021},dimensions={true},}
D. Hwangbo, "Status and prospects of arcing in the magnetic confinement fusion studies," Journal of Plasma and Fusion Research (Japanese) 97 (2021) 221–228.
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
@article{kulagin2021nano,title={Nano-tendril bundles behavior under plasma-relevant electric fields},author={Kulagin, VV and Sinelnikov, DN and Bulgadaryan, DG and Efimov, NE and Kurnaev, VA and Hwangbo, D and Ohno, N and Kajita, S},journal={Vacuum},volume={183},pages={109799},year={2021},publisher={Pergamon},doi={10.1016/j.vacuum.2020.109799},dimensions={true},}
V. Kulagin, D. Sinelnikov, D. Bulgadaryan, N. Efimov, V. Kurnaev, D. Hwangbo, N. Ohno, S. Kajita, "Nano-tendril bundles behavior under plasma-relevant electric fields," Vacuum 183 (2021) 109799.
https://doi.org/10.1016/j.vacuum.2020.109799
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 Research16 (2021) 1202061–1202061
@article{hayashi2021observation,title={Observation of Arc Trails with Significant Damage due to Glow Discharge Wall Conditioning in the Large Helical Device},author={Hayashi, Yuki and Masuzaki, Suguru and Motojima, Gen and Hwangbo, Dogyun and Fujiwara, Yutaka and Zhao, Mingzhong and Group, LHD Experiment and others},journal={Plasma and Fusion Research},volume={16},pages={1202061--1202061},year={2021},publisher={The Japan Society of Plasma Science and Nuclear Fusion Research},doi={10.1016/j.nme.2020.100843},dimensions={true},}
Y. Hayashi, S. Masuzaki, G. Motojima, D. Hwangbo, Y. Fujiwara, M. Zhao, L. Group, . others, "Observation of Arc Trails with Significant Damage due to Glow Discharge Wall Conditioning in the Large Helical Device," Plasma and Fusion Research 16 (2021) 1202061–1202061.
https://doi.org/10.1016/j.nme.2020.100843
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
@article{dhard2021plasma,title={Plasma-wall interaction studies in {W7-X}: main results from the recent divertor operations},author={Dhard, CP and Brezinsek, S and Mayer, M and Naujoks, D and Masuzaki, S and Zhao, D and Yi, R and Oelmann, J and Schmid, K and Romazanov, J and others},journal={Physica Scripta},volume={96},number={12},pages={124059},year={2021},publisher={IOP Publishing},doi={10.1016/j.nme.2020.100843},dimensions={true},}
C. Dhard, S. Brezinsek, M. Mayer, D. Naujoks, S. Masuzaki, D. Zhao, R. Yi, J. Oelmann, K. Schmid, J. Romazanov, . others, "Plasma-wall interaction studies in W7-X: main results from the recent divertor operations," Physica Scripta 96 (2021) 124059.
https://doi.org/10.1016/j.nme.2020.100843
Plasma Fusion Res.
Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX
@article{gamo2021influence,title={Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of {GAMMA 10/PDX}},author={Gamo, Hiroki and Ezumi, Naomichi and Sugiyama, Tsukasa and Nojiri, Kunpei and Kondo, Ayane and Hirata, Mafumi and Kohagura, Junko and Yoshikawa, Masayuki and Nakashima, Yousuke and Hwangbo, Dogyun and others},journal={Plasma and Fusion Research},volume={16},pages={2402041--2402041},year={2021},publisher={The Japan Society of Plasma Science and Nuclear Fusion Research},doi={10.1585/pfr.16.2402041},dimensions={true},}
H. Gamo, N. Ezumi, T. Sugiyama, K. Nojiri, A. Kondo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, D. Hwangbo, . others, "Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX," Plasma and Fusion Research 16 (2021) 2402041–2402041.
https://doi.org/10.1585/pfr.16.2402041
Plasma Fusion Res.
Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases
@article{zhang2021enhancement,title={Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases},author={Zhang, Rongshi and Kajita, Shin and Hwangbo, Dogyun and Tanaka, Hirohiko and Ohno, Noriyasu},journal={Plasma and Fusion Research},volume={16},pages={2405069--2405069},year={2021},publisher={The Japan Society of Plasma Science and Nuclear Fusion Research},doi={10.1585/pfr.16.2405069},dimensions={true},}
R. Zhang, S. Kajita, D. Hwangbo, H. Tanaka, N. Ohno, "Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases," Plasma and Fusion Research 16 (2021) 2405069–2405069.
https://doi.org/10.1585/pfr.16.2405069
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
@article{mccarthy2021effects,title={The effects of impurity gas seeding on the growth of fuzzy tungsten},author={McCarthy, Patrick and Hwangbo, Dogyun and Kajita, Shin and Bradley, James W},journal={Journal of Nuclear Materials},volume={556},pages={153125},year={2021},publisher={North-Holland},doi={10.1016/j.jnucmat.2021.153125},dimensions={true},}
P. McCarthy, D. Hwangbo, S. Kajita, J. Bradley, "The effects of impurity gas seeding on the growth of fuzzy tungsten," Journal of Nuclear Materials 556 (2021) 153125.
https://doi.org/10.1016/j.jnucmat.2021.153125
2020
Plasma Fusion Res.
Inspection of Arc Trails formed in stellarator/heliotron devices W7-X and LHD
@article{hwangbo2020inspection,title={Inspection of Arc Trails formed in stellarator/heliotron devices {W7-X} and {LHD}},author={Hwangbo, Dogyun and Kajita, Shin and Dhard, Chandra Prakash and Tokitani, Masayuki and Krause, Marco and Naujoks, Dirk and Masuzaki, Suguru and Klose, S{\"o}ren and Ohno, Noriyasu and others},journal={Plasma and Fusion Research},volume={15},pages={2402012--2402012},year={2020},publisher={The Japan Society of Plasma Science and Nuclear Fusion Research},doi={10.1585/pfr.15.2402012},dimensions={true},}
D. Hwangbo, S. Kajita, C. Dhard, M. Tokitani, M. Krause, D. Naujoks, S. Masuzaki, S. Klose, N. Ohno, . others, "Inspection of Arc Trails formed in stellarator/heliotron devices W7-X and LHD," Plasma and Fusion Research 15 (2020) 2402012–2402012.
https://doi.org/10.1585/pfr.15.2402012
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 Technology29 (2020) 125015
@article{hwangbo2020unipolar,title={Unipolar arc plasmas on nanostructured tungsten surfaces under perpendicular magnetic field},author={Hwangbo, Dogyun and Nishijima, Daisuke and Kajita, Shin and Doerner, Russell P and Ohno, Noriyasu},journal={Plasma Sources Science and Technology},volume={29},number={12},pages={125015},year={2020},publisher={IOP Publishing},doi={10.1088/1361-6595/abc817},dimensions={true},}
D. Hwangbo, D. Nishijima, S. Kajita, R. Doerner, N. Ohno, "Unipolar arc plasmas on nanostructured tungsten surfaces under perpendicular magnetic field," Plasma Sources Science and Technology 29 (2020) 125015.
https://doi.org/10.1088/1361-6595/abc817
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
@article{dhard2020inspection,title={Inspection of {W7-X} plasma-facing components after the operation phase {OP1.2b}: observations and first assessments},author={Dhard, CP and {\"A}k{\"a}slompolo, S and Balden, M and Baldzuhn, J and Biedermann, C and Br{\"a}uer, T and Brezinsek, S and Endler, M and Hayashi, Y and Hwangbo, D and others},journal={Physica Scripta},volume={2020},number={T171},pages={014033},year={2020},publisher={IOP Publishing},doi={10.1088/1402-4896/ab4b3f},dimensions={true},}
C. Dhard, S. Äkäslompolo, M. Balden, J. Baldzuhn, C. Biedermann, T. Bräuer, S. Brezinsek, M. Endler, Y. Hayashi, D. Hwangbo, . others, "Inspection of W7-X plasma-facing components after the operation phase OP1.2b: observations and first assessments," Physica Scripta 2020 (2020) 014033.
https://doi.org/10.1088/1402-4896/ab4b3f
Nucl. Fusion
Enhanced fuzzy tungsten growth in the presence of tungsten deposition
Patrick McCarthy, Dogyun Hwangbo, Matthew Bilton, Shin Kajita, and James W Bradley
@article{mccarthy2020enhanced,title={Enhanced fuzzy tungsten growth in the presence of tungsten deposition},author={McCarthy, Patrick and Hwangbo, Dogyun and Bilton, Matthew and Kajita, Shin and Bradley, James W},journal={Nuclear Fusion},volume={60},number={2},pages={026012},year={2020},publisher={IOP Publishing},doi={10.1088/1741-4326/ab6060},dimensions={true},}
P. McCarthy, D. Hwangbo, M. Bilton, S. Kajita, J. Bradley, "Enhanced fuzzy tungsten growth in the presence of tungsten deposition," Nuclear Fusion 60 (2020) 026012.
https://doi.org/10.1088/1741-4326/ab6060
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
@article{barengolts2020dynamics,title={Dynamics of the changes in the parameters of the arc plasma during the destruction of a helium-induced tungsten fuzz by arc pulses},author={Barengolts, SA and Hwangbo, D and Kajita, S and Ohno, N and Frolova, VP and Nikolaev, AG and Oks, EM and Shmelev, DL and Tsventoukh, MM and Yushkov, G Yu},journal={Nuclear Fusion},volume={60},number={4},pages={044001},year={2020},publisher={IOP Publishing},doi={10.1088/1741-4326/ab73c3},dimensions={true},}
S. Barengolts, D. Hwangbo, S. Kajita, N. Ohno, V. Frolova, A. Nikolaev, E. Oks, D. Shmelev, M. Tsventoukh, G. Yushkov, "Dynamics of the changes in the parameters of the arc plasma during the destruction of a helium-induced tungsten fuzz by arc pulses," Nuclear Fusion 60 (2020) 044001.
https://doi.org/10.1088/1741-4326/ab73c3
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
@article{khan2020helium,title={Helium irradiation effects on the surface modification and recrystallization of tungsten},author={Khan, Aneeqa and De Temmerman, Gregory and Kajita, Shin and Greuner, Henri and Balden, M and Hunger, K and Ohno, N and Hwangbo, D and Tomita, Y and Tokitani, M and others},journal={Physica Scripta},volume={2020},number={T171},pages={014050},year={2020},publisher={IOP Publishing},doi={10.1088/1402-4896/ab52c6},dimensions={true},}
A. Khan, G. De Temmerman, S. Kajita, H. Greuner, M. Balden, K. Hunger, N. Ohno, D. Hwangbo, Y. Tomita, M. Tokitani, . others, "Helium irradiation effects on the surface modification and recrystallization of tungsten," Physica Scripta 2020 (2020) 014050.
https://doi.org/10.1088/1402-4896/ab52c6
Nucl. Mater. Energy
Size distribution of nano-tendril bundles with various additional impurity gases
@article{zhang2020size,title={Size distribution of nano-tendril bundles with various additional impurity gases},author={Zhang, Rongshi and Hwangbo, Dogyun and Kajita, Shin and Tanaka, Hirohiko and Ohno, Noriyasu},journal={Nuclear Materials and Energy},volume={25},pages={100843},year={2020},publisher={Elsevier},doi={10.1016/j.nme.2020.100843},dimensions={true},}
R. Zhang, D. Hwangbo, S. Kajita, H. Tanaka, N. Ohno, "Size distribution of nano-tendril bundles with various additional impurity gases," Nuclear Materials and Energy 25 (2020) 100843.
https://doi.org/10.1016/j.nme.2020.100843
2019
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 Science47 (2019) 3617–3625
@article{hwangbo2019ignition,title={Ignition and sustainment of arcing on nanostructured tungsten under plasma exposure},author={Hwangbo, Dogyun and Nishijima, Daisuke and Kajita, Shin and Doerner, Russell P and Barengolts, Sergey A and Tsventoukh, Mikhail M and Tanaka, Hirohiko and Ohno, Noriyasu},journal={IEEE Transactions on Plasma Science},volume={47},number={8},pages={3617--3625},year={2019},publisher={IEEE},doi={10.1109/TPS.2019.2910839},dimensions={true},}
D. Hwangbo, D. Nishijima, S. Kajita, R. Doerner, S. Barengolts, M. Tsventoukh, H. Tanaka, N. Ohno, "Ignition and sustainment of arcing on nanostructured tungsten under plasma exposure," IEEE Transactions on Plasma Science 47 (2019) 3617–3625.
https://doi.org/10.1109/TPS.2019.2910839
Nucl. Mater. Energy
Growth process of nano-tendril bundles with sputtered tungsten
Dogyun Hwangbo, Shin Kajita, Hirohiko Tanaka, and Noriyasu Ohno
@article{hwangbo2019growth,title={Growth process of nano-tendril bundles with sputtered tungsten},author={Hwangbo, Dogyun and Kajita, Shin and Tanaka, Hirohiko and Ohno, Noriyasu},journal={Nuclear Materials and Energy},volume={18},pages={250--257},year={2019},publisher={Elsevier},doi={10.1016/j.nme.2019.01.008},dimensions={true},}
D. Hwangbo, S. Kajita, H. Tanaka, N. Ohno, "Growth process of nano-tendril bundles with sputtered tungsten," Nuclear Materials and Energy 18 (2019) 250–257.
https://doi.org/10.1016/j.nme.2019.01.008
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
@article{nishijima2019influence,title={Influence of heavier impurity deposition on surface morphology development and sputtering behavior explored in multiple linear plasma devices},author={Nishijima, D and Kreter, A and Baldwin, MJ and Borodin, D and Eksaeva, A and Hwangbo, D and Kajita, S and Miyamoto, M and Ohno, N and Patino, M and others},journal={Nuclear materials and energy},volume={18},pages={67--71},year={2019},publisher={Elsevier},doi={10.1016/j.nme.2018.12.008},dimensions={true},}
D. Nishijima, A. Kreter, M. Baldwin, D. Borodin, A. Eksaeva, D. Hwangbo, S. Kajita, M. Miyamoto, N. Ohno, M. Patino, . others, "Influence of heavier impurity deposition on surface morphology development and sputtering behavior explored in multiple linear plasma devices," Nuclear materials and energy 18 (2019) 67–71.
https://doi.org/10.1016/j.nme.2018.12.008
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 Science47 (2019) 3609–3616
@article{kajita2019ignition,title={Ignition and behavior of arc spots on helium irradiated tungsten under fusion relevant condition},author={Kajita, Shin and Hwangbo, Dogyun and Ohno, Noriyasu},journal={IEEE Transactions on Plasma Science},volume={47},number={8},pages={3609--3616},year={2019},publisher={IEEE},doi={10.1109/TPS.2019.2908193},dimensions={true},}
S. Kajita, D. Hwangbo, N. Ohno, "Ignition and behavior of arc spots on helium irradiated tungsten under fusion relevant condition," IEEE Transactions on Plasma Science 47 (2019) 3609–3616.
https://doi.org/10.1109/TPS.2019.2908193
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 Science47 (2019) 5186–5190
@article{sinelnikov2019field,title={Field emission from nanostructured tendril bundles},author={Sinelnikov, Dmitry and Bulgadaryan, Daniel and Hwangbo, Dogyun and Kajita, Shin and Kurnaev, Valery and Ohno, Noriyasu},journal={IEEE Transactions on Plasma Science},volume={47},number={11},pages={5186--5190},year={2019},publisher={IEEE},doi={10.1109/TPS.2019.2942725},dimensions={true},}
D. Sinelnikov, D. Bulgadaryan, D. Hwangbo, S. Kajita, V. Kurnaev, N. Ohno, "Field emission from nanostructured tendril bundles," IEEE Transactions on Plasma Science 47 (2019) 5186–5190.
https://doi.org/10.1109/TPS.2019.2942725
2018
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
@article{hwangbo2018ignition,title={Ignition and erosion of materials by arcing in fusion-relevant conditions},author={Hwangbo, Dogyun and Kajita, Shin and Barengolts, Sergey A and Tsventoukh, Mikhail M and Kawaguchi, Shota and Mesyats, Vadim G and Ohno, Noriyasu},journal={Contributions to Plasma Physics},volume={58},number={6-8},pages={608--615},year={2018},publisher={WILEY-VCH Verlag GmbH \& Co. KGaA Weinheim},doi={10.1002/ctpp.201700157},dimensions={true},}
D. Hwangbo, S. Kajita, S. Barengolts, M. Tsventoukh, S. Kawaguchi, V. Mesyats, N. Ohno, "Ignition and erosion of materials by arcing in fusion-relevant conditions," Contributions to Plasma Physics 58 (2018) 608–615.
https://doi.org/10.1002/ctpp.201700157
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
@article{hwangbo2018growth,title={Growth of nano-tendril bundles on tungsten with impurity-rich {He} plasmas},author={Hwangbo, Dogyun and Kajita, Shin and Ohno, Noriyasu and McCarthy, Patrick and Bradley, James W and Tanaka, Hirohiko},journal={Nuclear Fusion},volume={58},number={9},pages={096022},year={2018},publisher={IOP Publishing},doi={10.1088/1741-4326/aacd1f},dimensions={true},}
D. Hwangbo, S. Kajita, N. Ohno, P. McCarthy, J. Bradley, H. Tanaka, "Growth of nano-tendril bundles on tungsten with impurity-rich He plasmas," Nuclear Fusion 58 (2018) 096022.
https://doi.org/10.1088/1741-4326/aacd1f
Plasma. Fusion Res.
Pulsation effects of incident ion energy on W fuzz growth
@article{kajita2018pulsation,title={Pulsation effects of incident ion energy on W fuzz growth},author={Kajita, Shin and Kawaguchi, Shota and Hwangbo, Dogyun and Tanaka, Hirohiko and Ohno, Noriyasu},journal={Plasma and Fusion Research},volume={13},pages={1205001--1205001},year={2018},publisher={The Japan Society of Plasma Science and Nuclear Fusion Research},doi={10.1585/pfr.13.1205001},dimensions={true},}
S. Kajita, S. Kawaguchi, D. Hwangbo, H. Tanaka, N. Ohno, "Pulsation effects of incident ion energy on W fuzz growth," Plasma and Fusion Research 13 (2018) 1205001–1205001.
https://doi.org/10.1585/pfr.13.1205001
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 Atoms434 (2018) 9–12
@article{bulgadaryan2018proton,title={Proton scattering from tungsten fuzz},author={Bulgadaryan, D and Sinelnikov, D and Kurnaev, V and Kajita, S and Hwangbo, D and Ohno, N},journal={Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},volume={434},pages={9--12},year={2018},publisher={North-Holland},doi={10.1016/j.nimb.2018.07.038},dimensions={true},}
D. Bulgadaryan, D. Sinelnikov, V. Kurnaev, S. Kajita, D. Hwangbo, N. Ohno, "Proton scattering from tungsten fuzz," Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 434 (2018) 9–12.
https://doi.org/10.1016/j.nimb.2018.07.038
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 Science46 (2018) 4044–4050
@article{barengolts2018effect,title={Effect of the nanostructured layer thickness on the dynamics of cathode spots on tungsten},author={Barengolts, Sergey A and Mesyats, Vadim G and Tsventoukh, Mikhail M and Kajita, Shin and Hwangbo, Dogyun and Ohno, Noriyasu},journal={IEEE Transactions on Plasma Science},volume={46},number={11},pages={4044--4050},year={2018},publisher={IEEE},doi={10.1109/TPS.2018.2859953},dimensions={true},}
S. Barengolts, V. Mesyats, M. Tsventoukh, S. Kajita, D. Hwangbo, N. Ohno, "Effect of the nanostructured layer thickness on the dynamics of cathode spots on tungsten," IEEE Transactions on Plasma Science 46 (2018) 4044–4050.
https://doi.org/10.1109/TPS.2018.2859953
2017
Nucl. Mater. Energy
Erosion of nanostructured tungsten by laser ablation, sputtering and arcing
Dogyun Hwangbo, Shota Kawaguchi, Shin Kajita, and Noriyasu Ohno
@article{hwangbo2017erosion,title={Erosion of nanostructured tungsten by laser ablation, sputtering and arcing},author={Hwangbo, Dogyun and Kawaguchi, Shota and Kajita, Shin and Ohno, Noriyasu},journal={Nuclear Materials and Energy},volume={12},pages={386--391},year={2017},publisher={Elsevier},doi={10.1016/j.nme.2017.03.004},dimensions={true},}
D. Hwangbo, S. Kawaguchi, S. Kajita, N. Ohno, "Erosion of nanostructured tungsten by laser ablation, sputtering and arcing," Nuclear Materials and Energy 12 (2017) 386–391.
https://doi.org/10.1016/j.nme.2017.03.004
IEEE TPS
Field emission from metal surfaces irradiated with helium plasmas
Dogyun Hwangbo, Shin Kajita, Noriyasu Ohno, and Dmitry Sinelnikov
IEEE Transactions on Plasma Science45 (2017) 2080–2086
@article{hwangbo2017field,title={Field emission from metal surfaces irradiated with helium plasmas},author={Hwangbo, Dogyun and Kajita, Shin and Ohno, Noriyasu and Sinelnikov, Dmitry},journal={IEEE Transactions on Plasma Science},volume={45},number={8},pages={2080--2086},year={2017},publisher={IEEE},doi={10.1109/TPS.2017.2679211},dimensions={true},}
D. Hwangbo, S. Kajita, N. Ohno, D. Sinelnikov, "Field emission from metal surfaces irradiated with helium plasmas," IEEE Transactions on Plasma Science 45 (2017) 2080–2086.
https://doi.org/10.1109/TPS.2017.2679211
2016
Sci. Rep.
Fuzzy nanostructure growth on Ta/Fe by He plasma irradiation
Shin Kajita, Tomoya Ishida, Noriyasu Ohno, Dogyun Hwangbo, and Tomoko Yoshida
@article{kajita2016fuzzy,title={Fuzzy nanostructure growth on {Ta/Fe} by He plasma irradiation},author={Kajita, Shin and Ishida, Tomoya and Ohno, Noriyasu and Hwangbo, Dogyun and Yoshida, Tomoko},journal={Scientific Reports},volume={6},number={1},pages={30380},year={2016},publisher={Nature Publishing Group UK London},doi={10.1038/srep30380},dimensions={true},}
S. Kajita, T. Ishida, N. Ohno, D. Hwangbo, T. Yoshida, "Fuzzy nanostructure growth on Ta/Fe by He plasma irradiation," Scientific Reports 6 (2016) 30380.
https://doi.org/10.1038/srep30380
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 Series748 (2016) 012012
@article{sinelnikov2016arc,title={Arc tracks on nanostructured surfaces after microbreakdowns},author={Sinelnikov, D and Bulgadaryan, D and Hwangbo, Dogyun and Kajita, S and Kolodko, D and Kurnaev, V and Ohno, N},journal={Journal of Physics: Conference Series},volume={748},number={1},pages={012012},year={2016},organization={IOPscience},doi={10.1088/1742-6596/748/1/012012},dimensions={true},}
D. Sinelnikov, D. Bulgadaryan, D. Hwangbo, S. Kajita, D. Kolodko, V. Kurnaev, N. Ohno, "Arc tracks on nanostructured surfaces after microbreakdowns," Journal of Physics: Conference Series 748 (2016) 012012.
https://doi.org/10.1088/1742-6596/748/1/012012
2014
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
@article{hwangbo2014transition,title={Transition in velocity and grouping of arc spot on different nanostructured tungsten electrodes},author={Hwangbo, Dogyun and Kajita, Shin and Barengolts, Sergey A and Tsventoukh, Mikhail M and Ohno, Noriyasu},journal={Results in Physics},volume={4},pages={33--39},year={2014},publisher={Elsevier},doi={10.1016/j.rinp.2014.03.001},dimensions={true},}
D. Hwangbo, S. Kajita, S. Barengolts, M. Tsventoukh, N. Ohno, "Transition in velocity and grouping of arc spot on different nanostructured tungsten electrodes," Results in Physics 4 (2014) 33–39.
https://doi.org/10.1016/j.rinp.2014.03.001
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
@article{kajita2014arc,title={Arc spot grouping: An entanglement of arc spot cells},author={Kajita, Shin and Hwangbo, Dogyun and Ohno, Noriyasu and Tsventoukh, Mikhail M and Barengolts, Sergey A},journal={Journal of Applied Physics},volume={116},number={23},year={2014},publisher={AIP Publishing},doi={10.1063/1.4904917},dimensions={true},}
S. Kajita, D. Hwangbo, N. Ohno, M. Tsventoukh, S. Barengolts, "Arc spot grouping: An entanglement of arc spot cells," Journal of Applied Physics 116 (2014).
https://doi.org/10.1063/1.4904917
2013
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 Physics52 (2013) 11NC02
@article{hwangbo2013spectroscopic,title={Spectroscopic study and motion analysis of arc spot initiated on nanostructured tungsten},author={Hwangbo, Dogyun and Kajita, Shin and Osaka, Masashi and Ohno, Noriyasu},journal={Japanese Journal of Applied Physics},volume={52},number={11S},pages={11NC02},year={2013},publisher={IOP Publishing},doi={10.7567/JJAP.52.11NC02},dimensions={true},}
D. Hwangbo, S. Kajita, M. Osaka, N. Ohno, "Spectroscopic study and motion analysis of arc spot initiated on nanostructured tungsten," Japanese Journal of Applied Physics 52 (2013) 11NC02.