**Papers**

2017 | H. Togashi, H. Yamazaki, A. Ejiri, Y. Takase, N. Tsujii, S. Yajima, Y. Yoshida and TST-2 team, "Development of a Hard X-Ray Profile Measurement System in the TST-2 Spherical Tokamak", Plasma and Fusion Res. 12, 1402030 (2017). |

2017 | H. Furui, A. Ejiri, Y. Nagashima, Y. Takase, M. Sonehara, N. Tsujii, B. Roidl, T. Shinya, H. Togashi, H. Homma, K. Nakamura, T. Takeuchi, S. Yajima, Y. Yoshida, K. Toida, W. Takahashi, and H. Yamazaki, "Measurements of edge plasma parameters during internal reconnection events in the TST-2 spherical tokamak", Phys. Plasmas 24, 062504 (2017). |

2017 | Y. Takase, A. Ejiri, T. Fujita, N. Fukumoto, A. Fukuyama, K. Hanada, H. Idei, M. Nagata, Y. Ono, H. Tanaka, M. Uchida, R. Horiuchi, Y. Kamada, H. Kasahara, S. Masuzaki, Y. Nagayama, T. Oishi, K. Saito, Y. Takeiri and S. Tsuji-Iio, "Overview of spherical tokamak research in Japan", Nucl. Fusion 57, 102005 (2017). |

2017 | K. Kondo, M. Inomoto, X. Guo, T. Ushiki., T. Sugawara, T. Mihara, S. Kamio, H. Tanabe, Y. Ono, "Separated Double-Current Layersin a High-Guide-Field Reconnction Experiment", Plasma and Fusion Res. 12, 1202033 (2017). |

2017 | X. Guo, R. Horiuchi, C.Z. Cheng, Y. Kaminou, Y. Ono, "Energy conversion mechanism for electron perpendicular energy in high guide-field reconenction", Phys. Plasmas 24, 032901 (2017). |

2017 | Y. Kaminou, X. Guo, M. Inomoto, Y. Ono, R. Horiuchi, "Numerical study of Hall effects on counter-helicity spheromak merging by two-dimensional Hall-MHD siulations", Phys. Plasmas 24, 032508 (2017). |

2016 | K. Hanada, H. Zushi, H. Idei, K. Nakamura, M. Ishiguro, S. Tashima, E.I. Kalinnikova, Y. Nagashima, M. Hasegawa, A. Fujisawa, A.Higashijima, S. Kawasaki, H. Nakashima, O. Mitarai, A. Fukuyama, Y. Takase, X. Gao, H. Liu, J. Qian, M. Ono, R. Raman, "Power balance estimation in long duration discharges on QUEST", Plasma Science and Technology Vol.18, No.11, 1069-1075 (2016.11) |

2016 | K. Nakamuraa, M.M. Alam, Y.Z. Jiang, O. Mitarai, K. Kurihara, Y. Kawamata, M. Sueokae, M. Takechi, M. Hasegawa, K. Tokunaga, K. Araki, H. Zushi, K. Hanada, A. Fujisawa, H. Idei, Y. Nagashima, S. Kawasaki, H. Nakashima, A. Higashijima, T. Nagata, A. Fukuyama, "Analysis of plasma equilibrium based on orbit-driven current density profile in steady-state plasma on QUEST", Fusion Engineering and Design 109?111 (2016) 1528?1533 |

2016 | T. Shinya, Y. Takase, S. Yajima, C. Moeller, H. Yamazaki, N. Tsujii, Y. Yoshida, A. Ejiri, H. Togashi, K. Toida, H. Furui, H. Homma, K. Nakamura, B. Roidl, M. Sonehara, W. Takahashi and T. Takeuchi, "Plasma current start-up experiments using outboard- and top-launch lower hybrid wave on the TST-2 spherical tokamak", Nucl. Fusion, 57 036006 (2016). |

2016 | T. Ushiki, M. Inomoto, K. Yamasaki, X. Guo, T. Sugawara, K. Matsuyama, H. Koguchi, T. Yamada, "Generation of Energetic Electrons during Spherical Tokamak Merging in UTST", Plasma and Fusion Res. 11, 2402100 (2016). |

2016 | H. Tanaka, M. Uchida, T. Maekawa, Y.-S. Bae, M. Joung, J.H. Jeong and KSTAR tearm, "Non-inductive initiation of closed flux surfaces by ECH/ECCD on KSTAR using an oblique fundamental O-mode injection from the low field side", Nucl. Fusion 56, 046003 (2016) |

2016 | A. Kuwahata, M. Inomoto, R. Yanai and Y. Ono, "Energy flux due to electromagnetic fluctuations during guide field magnetic reconnection", Plasma and Fusion Res. 11, 1301087 (2016) |

2016 | R. Yanai, A. Kuwahata and M. Inomoto, "Characteristics of Magnetic Fluctuations during Magnetic Reconnection in Counter-helicity Spheromak Merging Experiment", Plasma and Fusion Res. 11, 2401069 (2016) |

2016 | M. M. Alam, K. Nakamura, F. Xia, O. Mitarai, M. Hasegawa, K. Tokunaga, K. Araki, H. Zushi, K. Hanada, A. Fujisawa, H. Idei, Y. Nagashima, S. Kawasaki, H. Nakashima, A. Higashijima, "Comparison of Current Density Profiles Based on Particle Orbit-Driven Current in Steady-State Plasma on QUEST", Fusion Engineering and Design 109-111, 1624-1630 (2016) |

2016 | O. Mitarai, K. Nakamura, M. Hasegawa, T. Onchi, H. Idei, A. Fujisawa, K. Hanada, H. Zushi, A. Higashijima, H. Nakashima, S. Kawasaki, QUEST group, K. Matsuoka, S. Koike, T. Takahashi, H. Tsutsui, "Comparative studies of inner and outer divertor discharges and a fueling study in QUEST", Fusion Engineering and Design 109-111, 1385-1370 (2016) |

2016 | K. Nakamura, M. M. Alam, Y. Jiang, O. Mitarai, M. Takechi, M. Hasegawa, K. Tokunaga, K. Araki, H. Zushi, K. Hanada, A. Fujisawa, H. Idei, Y. Nagashima, S. Kawasaki, H. Nakashima, A. Higashijima, A. Fukuyama, "Analysis of Plasma Equilibrium Based on Orbit-Driven Current Density Profile in Steady-State Plasma on QUEST", Fusion Engineering and Design 109-111, 1528-1533 (2016) |

2015 | K. Hanada, H. Zushi, N. Yoshida, N. Yugami, T. Honda, M. Hasegawa, K. Mishra, A. Kuzmin, K. Nakamura,A. Fujisawa, H. Idei, Y. Nagashima, O. Watanabe, T. Onchi, H. Watanabe, K. Tokunaga, A. Higashijima, S.Kawasaki, H.Nakashima, Y.Takase, A.Fukuyama, O.Mitarai, and Y. K. M. Peng, "Particle balance in long duration RF driven plasmas on QUEST", Journal of Nuclear Materials 463, 1084-1086 (2015) |

2015 | T. Shinya, Y. Takase, T. Wakatsuki, A. Ejiri, H. Furui, J. Hiratsuka, K. Imamura, T. Inada, H. Kakuda, H. Kasahara, R. Kumazawa, C. Moeller, T. Mutoh, Y. Nagashima, K. Nakamura, A. Nakanishi, T. Oosako, K. Saito, T. Seki, M. Sonehara, H. Togashi, S. Tsuda, N. Tsujii, T. Yamaguchi, "Non-inductive Plasma Start-up Experiments on the TST-2 Spherical Tokamak Using Waves in the Lower-hybrid Frequency Range", Nucl. Fusion 55 (7), 073003 (2015) |

2015 | S. Tsuda, A. Ejiri, H. Tanaka, Y. Takase, M. Uchida, T. Maekawa N. Tsujii and T. Takeuchi, "Measurement of Ion Temperature and Flow in RF Start-Up Plasmas in TST-2 and LATE", Plasma and Fusion Res. 10, 1202064 (2015) |

2015 | 菅原拓路、郭学瀚、井通暁、「中性粒子ビーム入射に向けた合体生成球状トカマクプラズマの電子温度・密度の評価」、電気学会論文誌A 135、pp.727-728 (2015) |

2015 | K. Yamasaki, S. Inoue, S. Kamio, T. G. Watanabe, T. Ushiki, X. Guo, T. Sugawara, K. Matsuyama, N. Kawakami, T. Yamada, M. Inomoto, and Y. Ono, "Laboratory study of diffusion region with electron energization during high guide field reconnection", Phys. Plasmas 22, 101202 (2015) |

2015 | X. Guo, M. Inomoto, T. Sugawara, K. Yamasaki, T. Ushiki, Y. Ono, and TS Group, "Localized Electron Heating by Strong Guide-Field Magnetic Reconnection", Phys. Plasmas 22, 101201 (2015) |

2015 | K. Mishra, H. Zushi, H. Idei, M. Hasegawa, T. Onchi, S. Tashima, S. Banerjee, H. Hanada, H. Togashi, T. Yamaguchi, A. Ejiri, Y. Takase, K. Nakamura, A. Fujisawa, Y. Nagashima, A. Kuzmin and QUEST team, "Self organization of high βp plasma equilibrium with an inboard poloidal magnetic field null in QUEST", Nucl. Fusion 55, 083009 (2015) |

2015 | K. Gi, Y. Ono, M. Nakamura, Y. Someya, H. Utoh, K. Tobita, M. Ono, "Conceptual design study of the moderate size superconducting spherical tokamak power plant", Nucl. Fusion (2015) |

2015 | S. Tsuda, A. Ejiri, H. Tanaka, Y. Takase, M. Uchida, T. Maekawa, N. Tsujii, T. Takeuchi, “Measurement of ion temperature and flow in RF start-up plasmas on TST-2 and LATE”, Plasma and Fusion Res. 10, 1202064 (2015) |

2015 | X. Guo, M. Inomoto, T. Sugawara, T.G. Watanabe, K. Yamasaki, T. Ushiki, Y. Ono, “Two-dimensional electron temperature measurement during strong guide-field reconnection by using slide-type Thomson scattering system”, Plasma and Fusion Res. 10, 3402017 (2015) |

2015 | M. Inomoto, T.G. Watanabe, K. Gi, K. Yamasaki, S. Kamio, R. Imazawa, T. Yamada, X. Guo, T. Ushiki, H. Ishikawa, H. Nakamata, N. Kawakami, T. Sugawara, K. Matsuyama, K. Noma, A. Kuwahata, H. Tanabe, “Centre-solenoid-free merging start-up of spherical tokamak plasmas in UTST”, Nucl. Fusion 55, 033013 (2015) |

2014 | 江尻晶、「今日からはじめる磁場閉じ込めプラズマ実験 5.楽しい実験は安全第一の精神から」、プラズマ・核融合学会誌、90、732-739 (2014) |

2014 | M. Hasegwa, K. Nakamura, H. Zushi, K. Hanada, A. Fujisawa, K. Matsuoka, H. Idei, Y. Nagashima, K. Tokunaga, S. Kawasaki, H. Nakashima, A. Higashijima, "Development of a Plasma Control System for Steady-state Operation on QUEST", Journal of the Korean Physical Society, Vol. 65, 1191-1195 (2014) |

2014 | 郭学瀚, 井通暁, 小野靖, "スライド型２次元トムソン散乱計測を用いた球状トカマク合体時の電子加熱の定量的評価", 電気学会論文誌A、2014年9月号 |

2014 | 牛木知彦, 井通暁, 小野靖, "球状トカマク合体時の磁気リコネクションにおける軟Ｘ線放射の観測", 電気学会論文誌A、2014年9月号 |

2013 | H. Itagaki, M. Inomoto, S. Kamio, Q.H. Cao, K. Takemura, K. Yamasaki, T.G. Watanabe, T. Yamada, "Development of a Quasi-steady Equilibrium Field System for Plasma Merging ST Startup Experiments on the UTST Device", Plasma and Fusion Res. 8, 1402139 (2013) |

**Presentations**

2014 | K. Kadowaki, A. Sato, M. Inomoto, Y. Ono, "Coronal mass ejection experiment using internal current torus plasma", Plasma Conference 2014, 19PB-063, Niigata, Japan, Nov. 18-21, 2014 |

2014 | R. Yanai, A. Kuwahata, M. Inomoto, Y. Ono, "Structure of Two Component Magnetic Reconnection and the Generation of High Frequency Magnetic Fluctuations by the Counter-helicity Merging", Plasma Conference 2014, 19PB-065, Niigata, Japan, Nov. 18-21, 2014 |

2014 | H. Tanabe, T. Yamada, T.G. Watanabe, K. Gi, A. Kuwahata, K. Kadowaki, Y. Kaminou, H. Koike, K. Nishida, S. Imanaka, H. Yamanaka, C. Michael, B. Crowley, N. Conway, R. Scannell, M. Gryaznevich, M. Inomoto, Y. Ono et al., "Ion heating during merging/reconnection startup of ST in MAST", Plasma Conference 2014, 21pC1-3, Niigata, Japan, Nov. 18-21, 2014 |

2014 | H. Ishikawa, T.G. Watanabe, N. Kawakami, M. Inomoto, "Impurity line spectroscopy during spherical tokamak merging in UTST", Plasma Conference 2014, 19pB-4, Niigata, Japan, Nov. 18-21, 2014 |

2014 | H. Nakamata, T.G. Watanabe, K. Yamasaki, A. Wang, H. Ishikawa, T. Ushiki, X. Guo, M. Inomoto, Y. Ono, "Localized Electromagnetic Fluctuation during High Guide Field Magnetic Reconnection", 20pD2-7, Niigata, Japan, Nov. 18-21, 2014 |

2014 | T. Ushiki, K. Ishiguchi, K. Matsuyama, H. Koguchi, M. Inomoto, "Study of Electron Acceleration during Magnetic Reconnection in UTST device", Plasma Conference 2014, 19PB-007, Niigata, Japan, Nov. 18-21, 2014 |

2014 | X. Guo, T. Sugawara, A. Wang, M. Inomoto, Y. Ono, "Evaluation of Electron Heating during Strong Guide-Field Magnetic Reconnection in UTST Merging Experiment", Plasma Conference 2014, 19PA-003, Niigata, Japan, Nov. 18-21, 2014 |

2014 | K. Yamasaki, S. Inoue, S. Kamio, T.G. Watanabe, A. Wang, T. Ushiki, H. Ishikawa, X. Guo, H. Nakamata, C.Z. Cheng, M. Inomoto, Y. Ono, "Investigation of high guide field reconnection in UTST merging experiment using floating potential measurement", Plasma Conference 2014, 19PB-067, Niigata, Japan, Nov. 18-21, 2014 |

2014 | T.G. Watanabe, H. Tanabe, H. Ishikawa, N. Kawakami, K. Yamasaki, A. Wang, T. Ushiki, X. Guo, H. Nakamata, S. Kamio, T. Yamada, M. Inomoto, Y. Ono, "Verification of heating mechanism during spherical tokamak merging using Doppler spectroscopy", Plasma Conference 2014, 19PB-101, Niigata, Japan, Nov. 18-21, 2014 |

2014 | M. Inomoto, T.G. Watanabe, K. Yamasaki, T. Ushiki, X. Guo, H. Ishikawa, H. Nakamata, Y. Ono, "High-beta spherical tokamak start-up by using outer PF coils and plasma merging in UTST", Plasma Conference 2014, 21PA-020, Niigata, Japan, Nov. 18-21, 2014 |

2014 |
M. Inomoto, T.G. Watanabe, K. Yamasaki, S. Kamio, T. Yamada, A. Wang, X.
Guo, T. Ushiki, H. Ishikawa, H. Nakamata, H. Itagaki, A. Kuwahata, B. Gao,
R. Yanai, "Generation of Energetic Electrons by Magnetic Reconnection |

2014 | K. Gi, Y. Ono, M. Nakamura, Y. Someya, N. Aiba, H. Utoh, K. Tobita, "Conceptual Design Study of the Large Size and Low Magnetic Field Superconducting Spherical Tokamak Power Plant", 25th IAEA Fusion Energy Confrence, FIP/P7-15, Saint Petersburg, Russia, Oct. 13-18, 2014 |

2014 | K. Mishra, H. Zushi, H. Idei, M. Hasegawa, T. Onchi, S. Tashima, S. Banerjee, H. Hanada, K. Nakamura, A. Kuzmin, A. Fujisawa, Y. Nagashima, QUEST team, "Self Organization of High βp Plasma Equilibrium with an Inboard Poloidal Null Sustained by Fully Non-inductive Current Drive in QUEST", 25th IAEA Fusion Energy Confrence, EX/P1-39, Saint Petersburg, Russia, Oct. 13-18, 2014 |

2014 | H. Zushi, A. Kuzmin, I. Takagi, S.K. Sharma, M. Hasegawa, M. Kobayashi, Y. Hirooka, N. Yoshida, A. Rusinov, A. Inoue, H. Zhou, A. Fujisawa, K. Hanada, H. Idei, K. Nakamura, Y. Nagashima, K. Matsuoka, T. Onchi, S. Tashima, S. Banerjee, M. Sakaguchi, E. Kalinnikova, K. Mishra, X. Liu, S. Kubo, Y. Ueda, T. Fujita, S. Ide, N. Ohno, A. Hatayama, A. Ejiri, T. Yamaguchi, J. Hiratsuka, H. Togashi, Y. Takase, A. Fukuyama, O. Mitarai, "Determination of the system function for the particle circulation process using perturbation technique in QUEST", 25th IAEA Fusion Energy Confrence, EX/P1-36, Saint Petersburg, Russia, Oct. 13-18, 2014 |

2014 | H. Tanaka, M. Uchida, T. Maekawa, K. Kuroda, C. Ikeda, T. Shigemura, K. Nagano, M. Wada, "Observation of Intermittent Plasma Ejection from a Highly Overdense Spherical Tokamak Plasma Maintained by Electron Bernstein Wave Heating and Current Drive in LATE ", 25th IAEA Fusion Energy Confrence, EX/P7-41, Saint Petersburg, Russia, Oct. 13-18, 2014 |

2014 | K. Nakamura, H. Fujita, X. Liu, E. Xue, O. Mitarai, M. Hasegawa, K. Tokunaga, K. Araki, H. Zushi, K. Hanada, A. Fujisawa, H. Idei, Y. Nagashima, S. Kawasaki, H. Nakashima, A. Higashijima, "Quaternion Analysis of Matrix Converter and Three-Phase Power Electronic Circuit", International Conference on Electrical Engineering 2014, APE1179, Jeju, Korea, June 15-19, 2014 |

2013 | K. Hanada, H. Zushi, N. Yoshida, M. Hasegawa, K. Mishra, A. Kuzmin, K. Nakamura, A. Fujisawa, H. Idei, Y. Nagashima, O. Watanabe, T. Onchi, H. Watanabe, K. Tokunaga, A. Higashijima, S.Kawasaki, H.Nakashima, Y.Takase, A.Fukuyama, O.Mitarai, T.Maekawa, Y. K. M. Peng, "Particle balance in long duration RF driven plasmas on QUEST", 21st International Conference on Plasma Surface Interactions 2014, Kanazawa, Japan, May 26-30, 2014 |

2013 | M. Hasegawa, K. Nakamura, H. Zushi, K. Hanada, A. Fujisawa, K. Matsuoka, H. Idei, Y. Nagashima, K. Tokunaga, S. Kawasaki, H. Nakashima, A.Higashijima, "Development of plasma control system for steady state operation on QUEST", 9th Asia Plasma and Fusion Association Conference, Gyeongju, Korea, Nov. 5-8, 2013, TP-75 (2013.11.5) |

2013 | H. Tanaka, M. Uchida, T. Maekawa, Y-S. Bae, M. Joung, J.H. Jeong. "CS-less Tokamak Start-up by ECH/ECCD in KSTAR", 9th Asia Plasma and Fusion Association Conference, Gyeongju, Korea, Nov. 5-8, 2013, TP-88 (2013.11.5) |

2013 | T. Maekawa, H. Tanaka, M. Uchida, K. Kuroda, C. Ikeda, T. Shigemura, "Recent Progress in ECH/ECCD Experiments on LATE", 9th Asia Plasma and Fusion Association Conference, Gyeongju, Korea, Nov. 5-8, 2013, TP-89 (2013.11.5) |

2013 | K. Nakamura, H. Fujita, X.L. Liu, E.B. Xue, O. Mitarai, M. Hasegawa, K. Tokunaga, H. Zushi, K. Hanada, A. Fujisawa, H. Idei, Y. Nagashima, S. Kawasaki, H. Nakashima, A. Higashijima, K. Araki, ”Quaternion Concept in Matrix Converter Design for Feedback Stabilization by Magnetic Field Coil”, International Conference on Electrical Engineering 2013, S7-02/FP0393, Xiamen, China, July 14-17, 2013 |

2013 | K. Gi, H. Tanabe, T. Watanabe, T. Yamada, M. Inomoto, M. Gryaznevich, Y. Ono, "Non-inductive Reconnection Start-up Experiment of Spherical Tokamak", 12th International Workshop on the Interrelationship between Plasma Experiments in the Laboratory and in Space, Hakuba, Japan, July 1-5, 2013, P-5 (2013.7.1) |

2013 | S. Inoue, Y. Kaminou, K. Yamasaki, Y. Ono, R. Horiuchi, C.Z. Cheng, "Full-particle Simulation of High-energy Ions during Guide Field Magnetic Reconnection", 12th International Workshop on the Interrelationship between Plasma Experiments in the Laboratory and in Space, Hakuba, Japan, July 1-5, 2013, P-12 (2013.7.1) |

2013 | T. G. Watanabe, Q. H. Cao, H. Itagaki, K. Yamasaki, S. Kamio, T. Yamada, M. Inomoto, Y. Ono, "Plasmoid-induced Helicity Injection Experiments in UTST Spherical Tokamak Experiment", 12th International Workshop on the Interrelationship between Plasma Experiments in the Laboratory and in Space, Hakuba, Japan, July 1-5, 2013, P-6 (2013.7.1) |

2013 | K. Yamasaki, S. Kamio, S. Inoue, K. Takemura, A. Wang, X. Guo, H. Ishikawa, T. Ushiki, H. Nakamata, T. G. Watanabe, Q. H. Cao, H. Itagaki, T. Yamada, M. Inomoto, C. Z. Cheng, Y. Ono, "Floating Potential Measurement of Magnetic Reconnection Region with High Guide Field in the UTST Merging Experiment", 12th International Workshop on the Interrelationship between Plasma Experiments in the Laboratory and in Space, Hakuba, Japan, July 1-5, 2013, P-11 (2013.7.1) |

2013 | K. Kitazumi, S. Ito, M. Inomoto, Y. Ono, "Development of Two-dimensional Thomson Scattering Measurement using Multiple Reflection and the Time-of-flight of Laser Light for TS-4 Magnetic Reconnection Experiment", 12th International Workshop on the Interrelationship between Plasma Experiments in the Laboratory and in Space, Hakuba, Japan, July 1-5, 2013, P-7 (2013.7.1) |

2013 | K.Hanada, H.Zushi, H.Idei, K.Nakamura, M.Ishiguro, S.Tashima, E.I.Kalinnikova, Y.Nagashima, M.Hasegawa, A.Fujisawa, A.Higashijima, S.Kawasaki, H.Nakashima, O.Mitarai, T.Maekawa, A.Fukuyama, Y.Takase, X. Gao, H.Liu, J.Qian, M.Ono, R.Raman, M. Peng, "Power balance estimation in long duration discharges on QUEST", A3 Foresight Program Workshop on Critical Physics Issues Specific to Steady State Sustainment of High-Performance Plasmas, Beijing, China, May 20-23, 2013 (2013.5.22) |

2013 | K. Nakamura, H. Fujita, X.L. Liu, E.B. Xue, F. Xia, O. Mitarai, K. Kurihara, Y. Kawamata, M. Sueoka, M. Hasegawa, K. Tokunaga, H. Zushi, K. Hanada, A. Fujisawa, K. Matsuoka, H. Idei, Y. Nagashima, S. Kawasaki, H. Nakashima, A. Higashijima, K. Araki, and A. Fukuyama, "Shape reconstruction of steady state divertor plasma on QUEST", A3 Foresight Program Workshop on Critical Physics Issues Specific to Steady State Sustainment of High-Performance Plasmas, Beijing, China, May 20-23, 2013 (2013.5.22) |