## Recent Publications

### Journals

**"Mapping of power deposition zone of electron Bernstein waves externally excited in tokamak plasmas"**

T. Maekawa, H. Tanaka and M. Uchida

*Plasma Phys. Control. Fusion,***61 105017**(2019)**"Non-inductive build-up of a hot plasma by X-wave ECH/ECCD to remove initial high loop-voltage from start-up of fusion tokamaks"**

T. Maekawa, M. Uchida and H. Tanaka

*Nucl. Fusion,***58 016037**(2018)**"Non-inductive initiation of closed flux surfaces by ECH/ECCD on KSTAR using an oblique fundamental O-mode injection from the low-field side"**

H. Tanaka, M. Uchida, T. Maekawa, Y.-S. Bae, M. Joung, J.H. Jeong and KSTAR team

*Nucl. Fusion,***56 046003**(2016)**"Shift in principal equilibrium current from a vertical to a toroidal one towards the initiation of a closed flux surface in ECR plasmas in the LATE device"**

K.Kuroda, M.Wada, M.Uchida, H.Tanaka and T.Maekawa

*Plasma Phys. Control. Fusion,***58 025013**(2016)**"Cross-field potential hill arisen eccentrically in toroidal electron cyclotron resonance plasmas in the Low Aspect ratio Torus Experiment device to regulate electron and ion flows from source to boundary"**

K.Kuroda, M.Wada, M.Uchida, H.Tanaka and T.Maekawa

*Plasma Phys. Control. Fusion,***57 075010**(2015)**"Circular TE11-based waveguide polarizer for efficient coupling to electron Bernstein wave"**

Y.Noguchi, M.Hibino, M.Uchida, H.Tanaka and T.Maekawa

*Plasma Phys. Control. Fusion,***55 125005**(2013)**"Detection of Vertical Charge Separation Current in a Toroidal ECR plasma by Radially Aligned Multi-Electrodes"**

K.Kuroda, M.Uchida, H.Tanaka and T.Maekawa

*Plasma and Fusion Research, Letters,***7 1302098**(2012)**"Development of an ion beam probe system for potential measurement in the Low Aspect ratio Torus Experiment Device"**

H.Tanaka, S.Omi, J.Katsuma, Y.Yamamoto, M.Uchida, T.Maekawa and H.Iguchi

*IEEJ Trans. Fundamentals and Materials,***132 567**(2012)**"Open field equilibrium current and cross-field passing electrons as an initiator of a closed flux surface in EC-heated toroidal plasmas"**

T.Maekawa, T.Yoshinaga, M. Uchida, F.Watanabe and H.Tanaka

*Nucl. Fusion,***52 083008**(2012)**"Improvement of EC-driven spherical tokamak discharge by a radial magnetic perturbation on energetic trapped electrons"**

F.Watanabe, M.Uchida, H.Tanaka and T.Maekawa

*Plasma and Fusion Research, Rapid Communications,***7 1205004**(2012)**"Soft X-Ray CT Imaging of a Low-Aspect-Ratio Toroidal Plasma Maintained Solely by Electron Cyclotron Heating"**

H.Tanaka, T.Takeuchi, M.Uchida and T.Maekawa

*IEEE Trans. Plasma Science,***Vol.39 No.11 2480**(2011)**"Generation of Initial Closed Flux Surface by ECH at Conventional Aspect Ratio of R/a ~ 3; Experiments on the LATE device and JT-60U Tokamak"**

M.Uchida, T.Maekawa, H.Tanaka, S.Ide, Y.Takase, F.Watanabe, S.Nishi

*Nucl. Fusion,***51 063031**(2011)**"Study of Electron Orbits for Formation of Toroidal Closed Flux Surface by ECH"**

T.Maekawa, T.Yoshinaga, H.Tanaka, M.Uchida, F.Watanabe

*Plasma Sci. Technol.,***13 342**(2011)**"Current Circulation and Equilibrium in Toroidal Electron Cyclotron Resonance (ECR) Plasmas in the LATE Device"**

S.Nishi, T.Sakabe, M.Uchida, H.Tanaka, T.Maekawa

*Plasma Phys. Control. Fusion,***52 125004**(2010)**"Observation of Vertical Charge-Separation Current in an Electron- Cyclotron-Heated Toroidal Plasma"**

S.Nishi, T.Sakabe, M.Uchida, H.Tanaka, T.Maekawa

*Plasma Phys. Control. Fusion,***52 065011**(2010)**"Rapid Current Ramp-up by Cyclotron-Driving Electrons beyond Runaway Velocity"**

M.Uchida, T.Yoshinaga, H.Tanaka and T.Maekawa

*Phys. Rev. Lett.,***104 065001**(2010)**"A Current Profile Model for Magnetic Analysis of the Start-up Phase of Toroidal Plasma Driven by Electron Cyclotron Heating and Current Drive"**

T.Yoshinaga, M.Uchida, H.Tanaka and T.Maekawa

*Nucl. Fusion,***47 210**(2007)**"Spontaneous Formation of Closed Field Torus Equilibrium via Current Jump Observed in an Electron Cyclotron Heated Plasma"**

T.Yoshinaga, M.Uchida, H.Tanaka and T.Maekawa

*Phys. Rev. Lett.,***96 125005**(2006)

### IAEA Proceedings

- "Electron Beam Injection to Non-Inductively-Produced Spherical Tokamak Plasmas by Electron Bernstein Wave in LATE"

H. Tanaka, T. Kuzuma, R. Ashida, R. Kajita, T. Nagaeki, T. Nakai, S. Matsui, S. Yamagata, R. Nakai, X. Guo, Y. Nozawa, M. Uchida, T. Maekawa

**Proceedings of 28th IAEA Fusion Energy Conference**, Nice, France, (Virtual Event) (2021) EX/P7-18. - "Electron Bernstein Wave Heating and Current Drive with Multi-Electron Cyclotron Resonances During Non-inductive Start-up on LATE"

H. Tanaka, Y. Nozawa, M. Uchida, R. Kajita, Y. Omura, Y. Sakai, H. Shirai, J. Ootani, K. Goto, W. Tsukamoto, T. Noguchi, X. Guo, T. Maekawa

**Proceedings of 27th IAEA Fusion Energy Conference**, Ahmedabad, India, (2018) EX/P3-19. - "Non-inductive Production of Extremely Overdense Spherical Tokamak Plasma by Electron Bernstein Wave Excited via O-X-B Method in LATE"

H. Tanaka, M. Uchida, T. Maekawa, K. Kuroda, Y. Nozawa, A. Yoshida, D. Watanabe, K. Takamatsu, A. Hoshino, D. Honda, T. Kawaharada

**Proceedings of 26th IAEA Fusion Energy Conference**, Kyoto, Japan, (2016) EX/P4-45. - "Observation of Intermittent Plasma Ejection from a Highly Overdense Spherical Tokamak Plasma Maintained by Electron Bernstein Wave Heating and Current Drive in LATE"

H. Tanaka, M. Uchida, T. Maekawa, K. Kuroda, C. Ikeda, T. Shigemura, K. Nagao, M. Wada

**Proceedings of 25th IAEA Fusion Energy Conference**, Saint Petersburg, Russia, (2014) EX/P7-41. - "Noninductive Formation of Spherical Tokamak at 7 Times the Plasma Cutoff Density by Electron Bernstein Wave Heating and Current Drive on LATE"

M. Uchida, T. Maekawa, H. Tanaka, F. Watanabe, Y. Noguchi, K. Kuroda, S. Omi, T. Fukunaga, R. Hayashi, T. Kanemitsu, J. Katsuma, H. Mizogami

**Proceedings of 24th IAEA Fusion Energy Conference**, San Diego, USA, (2012) EX/P6-18. - "Generation of Initial Closed Flux Surface by ECH at Conventional Aspect Ratio of R/a ~ 3; Experiments on the LATE device and JT-60U Tokamak"

M.Uchida, T.Maekawa, H.Tanaka, S.Ide, Y.Takase, F.Watanabe, S.Nishi

**Proceedings of 23rd IAEA Fusion Energy Conference**, Daejeon, Korea, (2010) EXW/P2-12. - "Non-Solenoidal Formation of Spherical Torus by ECH/ECCD in LATE"

H.Tanaka, T.Maekawa, M.Uchida, T.Yoshinaga, S.Nishi, Y.Kawazu, K.Kurata and T.Takeuchi

**Proceedings of 22nd IAEA Fusion Energy Conference**, Geneve, Switzerland (2008) EX/P6-8.) - "Spherical Tokamak Startup and Formation by ECH without Central Solenoid on LATE"

H.Tanaka, T.Maekawa, M.Uchida, T.Yoshinaga, J.Yamada, T.Matsumoto, T.Tanahashi, K.Yoshida, Y.Yamahana, Y.Matsumoto, W.Hamada, K.Komiya and A.Iwamae

**Proceedings of 21st IAEA Fusion Energy Conference, Chengdu**, China (2006) EX/P6-6. - "Formation of Spherical Tokamak Equilibria by ECH in the LATE Device"

T.Maekawa, H.Tanaka, M.Uchida, S.Yamaguchi, H.Igami, T.Yoshinaga, M.Konno, K.Katsuura, K.Hayashi, Y.Abe and J.Yamada

**Proceedings of 20th IAEA Fusion Energy Conference**, Vilamoura, Portugal (2004) EX/P4-27. - "Start-up and Formation of ST Plasmas by ECH on the LATE Device"

T.Maekawa, H.Tanaka, M.Uchida, H.Igami, T.Yoshinaga and K.Higaki

**Proceedings of 19th IAEA Fusion Energy Conference**, Lyon, France (2002) EX/P4-16.