I am currently a Ph.D candiate in Prof. Komurasaki's laboratory at the University of Tokyo. Main research works of Komurasaki Laboratory cover high energy beam propulsion, electric propulsion, wireless energy transmission, and Lunar resources utilization. My research interests are on plasma structure, electron transport and discharge oscillation in Hall thrusters which can be categorized as ExB plasma.
Room502, Eng.7 Bldg., Univ. of Tokyo
7-3-1, Hongo, Bunkyo-ku
Tokyo 113-8656 JAPAN
Ph.D. candidate in Aeronautics and Astronautics• Sep. 2016 - Current
M.Eng. in the field of Aeronautics and Astronautics• Oct. 2014 - Sep. 2016
B.S. in Mechanics and Aerospace Engineering• Mar. 2006 - Feb. 2014
Visiting Student Research Collaborator• Sep. 2016 - Oct. 2016
Laser Induced Incandescence (LII) signal modeling, and particle temperature/size simulation to characterize nano-synthesis in carbon arc discharge.
 R. Kawashima, J. Bak, S. Matsuzawa, T. Inamori, "Particle Simulation of Plasma Drag Force Generation in the Magnetic Plasma Deorbit," J. of Spacecr. Rockets, Vol. 55, No. 5, pp. 1074-1082 (2018)
 R. Kawashima, J. Bak, K. Komurasaki, H. Koizumi, "Two-dimensional Modeling of the Hall Thruster Discharge with Nonuniform Propellant Supply in Azimuth," Front. Appl. Plasma Technol., Vol. 11, No. 1, pp. 7-12 (2018)
 Y. Hamada, J. Bak, R. Kawashima, et al., "Hall Thruster Development for Japanese Space Propulsion Programs," Trans. Japan Soc. Aero. Space Sci., Vol. 60, No. 5, p. 320-326 (2017)
 S. Yatom, J. Bak, A. Khrabryi, and Y. Raitses, "Detection of nanoparticles in carbon arc discharge with laser-induced incandescence," Carbon, Vol. 117, pp. 154-162 (2017)
 朴俊輝, 川嶋嶺, 水川将暢, 小紫公也, 小泉宏之, "推進剤が不一様に供給されたホールスラスタ内のプラズマ諸量," プラズマ応用科学, Vol. 25, No. 1, pp. 9-14 (2017)
 濱田悠嗣, 朴俊輝, 小紫公也, 江川雄亮, 山本直嗣, 高畑侑弥, 角間徹生, 古久保裕介, 田原弘一, "5 kW級ホールスラスタ RAIJIN の性能解析", 日本航空宇宙学会論文集, Vol. 65, No.2, pp. 82-86 (2017)
 水川将暢, 朴俊輝, 濱田悠嗣, 小紫公也, 川嶋嶺, 小泉宏之, "マグネティックシールディング搭載アノードレイヤ型ホールスラスタの放電室磁場形状改良によるプルーム発散抑制," プラズマ応用科学, Vol. 24-1, pp. 3-8, 2016.
 J. Bak, R. Kawashima, B. Van Loo, K. Komurasaki and H. Koizumi, “Investigation of Electron Cross-field Transport in Hall Thrusters with Inhomogeneity of Plasma Density and Potential in Azimuth”, 2nd Asia-Pacific Conference on Plasma Physics(AAPPS-DPP 2018), Kanazawa, Japan, 12th - 17th Nov. 2018
 S. Yatom, A. Gerakis, A. Khrabry, J. Bak, H. Belanger, M. Shneider, J. Mitrani, I. Kaganovich, A. Khodak, B. Stratton, V. Vekselman and Y. Raitses, “In Situ Approaches for Diagnostics of Nanoparticles in Plasmas”, 71st Annual Gaseous Electronics Conference, Portland, OR, USA, 5th - 9th Nov. 2018
 J. Bak, R. Kawashima, K. Komurasaki, H. Koizumi, “Effect of Density Inhomogeneity in Azimuth on Discharge Oscillation Suppression and Electron Diffusion in Hall Thrusters”, 54th AIAA/SAE/ASEE Joint Propulsion Conference, Cincinnati, OH, USA, 9th - 11th Jul. 2018
 R. Kawashima, J. Bak, K. Komurasaki, H. Koizumi and K. Hara, “Effect of Azimuthal Non-uniformity on the Hall Thruster Discharge”, 35th International Electric Propulsion Conference, Atlanta, GA, USA, 8th – 12th Oct. 2017
 S. Yatom, J. Bak, J.M. Mitrani, M.N. Shneider, B.C. Stratton, and Y. Raitses, “Investigation of nanoparticles formation in carbon arc with Laser Induced Incandescence (LII)”, 69th Annual Gaseous Electronics Conference, Bochum, Germany, 10th - 14th Oct. 2016
 J. Bak, Y. Hamada, Y. Hirano, K. Komurasaki, et al., “Operational Properties of UT-58 Anode Layer Hall Thruster with Modified Magnetic Field and Guard-ring Material”, 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, UT, USA, 25th - 27th Jul. 2016
 T. Schönherr, Y. Hirano, J. Suzuki, S. Akagi, J. Bak, et al., “Erosion Reduction Measures in Anode Layer Type Hall Thruster”, 5th Space Propulsion 2016, Rome, Italy, 2nd - 6th May 2016
 Y. Hamada, Y. Hirano, J. Bak, R. Kawashima, et al., “Thrust Performance Measurement of High-power RAIJIN Hall Thruster Using Improved Dual Pendulum Thrust Stand”, 8th AJCPP, Kagawa, JAPAN, 16th - 19th Mar. 2016
 T. Inamori, K. Iwanaga, J. Bak, P. Saisutjarit, “Interplanetary Attitude Control System Using IMF in a Small Sized Spacecraft”, 37th IEEE Aerospace Conference, Big Sky, MT, USA, 5th - 12th Mar. 2016
• Nov. 2018: AAPPS-DPP Poster Prize, 2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP 2018), AAPPS
• Apr. 2018 - Mar. 2020: Research Fellowship for Young Scientists, Japan Society for the Promotion of Science, Japan
• Apr. 2014 - Mar. 2018: Japanese Government (MEXT) Scholarship, Ministry of Education, Culture, Sports, Science and Technology, Japan
• Hall thrusters performance data archive “CLICK HERE for Open Google Spreadsheet”
Built iodine feed system being automatically controlled by LabVIEW, testing its validity.
Supervisor : Prof. Kimiya KomurasakiHall Thrusters, Iodine
Research on an attitude control system for nano-spacecraft using a magnetic torque generated by an electromagnetic coil under an interplanetary magnetic field. Worked on analysing solar wind magnetic field from OMNI data by using MATLAB.
Supervisor : Dr. Takaya InamoriIMF, ACS, Small Spacecrafts
Worked on developing a location determination program with MATLAB, which utilizes the magnetic field generated by magnetic coils on the satellites and estimates of the location of a magnetic sensor on a deployable part on the satellites.
Supervisor : Dr. Takaya InamoriSmall Spacecrafts
Generating characteristic maps of discharge oscillation amplitude and anode efficiency of anode layer thruster. Observed the relation between magnetic topology and thruster performance.
Supervisor : Prof. Kimiya KomurasakiHall thrusters, Discharge Oscillation
Nanomaterials can revolutionize many fields of science and technology.
As one of several diagnostics, the laser-induced incandescence (LII) diagnostic is used for
in situ characterization of nanoparticle synthesis in a background, atmospheric-pressure plasma.
I developed MATLAB tool to simulate LII signal covering nm-μm particle size to understand
nano-synthesis mechanism in carbon arc discharge, and evaluated particle sizes and energy
balance at radial location in carbon arc discharge.
The detail of my work can be found from the publication button below. For more details of nanosynthesis researsh in PPPL, please visit PPPL nano Laboratory.
Research on developing magnetic plasma deorbit system using magnetic torque interference with space plasma. Working on adjusting a pre-developed electromagnetic particle-in-cell code to simulate the interference between satellite body and space plasma.Deorbit
Investigation of how azimuthal non-uniform parameters in anode layer thruster influence on discharge oscillation characteristic and electron transport.
Supervisor : Prof. Kimiya KomurasakiPlasma inhomogeneity
* 2019 Sep. IEPC, Vienna, Austria
* 2019 Jul. ICPIG, Sapporo, Japan
Room502, Eng.7 Bldg., Univ. of Tokyo 7-3-1, Hongo, Bunkyo-ku Tokyo 113-8656 JAPAN
Tel : +81-3-5841-6559
E-mail : j.bak[at]al.t.u-tokyo.ac.jp