Publications

[2024]

• Kim, Dong-Kwon; Lee, Jaehyun; Dongjae Lee; GS Yun*, "Development of a toroidally resolved broadband ECE imaging system for measurement of turbulent fluctuations on the KSTAR", accepted in Rev. Sci. Instrum.

• M.J. Choi et al. "Mesoscopic transport in KSTAR plasmas: avalanches and the E × B staircase", Plasma Phys. Control. Fusion. 66 (2024) 065013 

• Dongjae Kwak, DK Kim, MU Lee, JW Kim, B Peterson, J Kim*, GS Yun*, "Investigation of radiation power and carbon evaporation in infrared sensor bolometer", Fusion Engineering and Design 203 (2024) 114421

• Kim, Dong-Kwon; Lee, Jaehyun; Choi, Minjun; Yoon, Young Dae; Woo, Minho; Kim, Minho; Yun, Gunsu*, "Formation of small-scale modes via ECCD injection into KSTAR plasma core", Nucl. Fusion 64  (2024) 046004

• Woojin Song et al., "Case Study of Advanced Ramp-up Profile for HTS Magnet Based Carbon Therapy Synchrotron", IEEE Trans. Applied Superconductivity 34 (2024) 4402404

[2023]

• Sangwoong Yoon, Frank C. Park, Gunsu S Yun, Iljung Kim, Yung-Kyun Noh, "Variational Weighting for Kernel Density Ratios", accepted to NeurIPS 2023.

• Young Dae Yoon and Gunsu Yun, "Theory of collisionless current sheet relaxation and phase-space classification", submitted to PPCF.

• Young Dae Yoon, Paul M. Bellan, and Gunsu Yun, "Phase-space analysis of ordered and disordered nonthermal ion energization during magnetic reconnection", The Astrophysical Journal (2023) 956-105.

• Jaeuk Heo, Yeonguk Kim, Gunsu Yun, and Dong Eon Kim, "Gain Dynamics of Inner-Shell Vacancy States Pumped by High-Intensity XFEL in Mg, Al and Si", Optics Express 31 (2023) 26948

• Young Dae Yoon*, Deirde Wendel, and Gunsu Yun*, "Equilibrium selection via current sheet relaxation and guide field amplification", Nature Commun. 14 (2023) 139

• Minuk Lee*, Gunsu S. Yun*, and Jeong-Young Ji*, "Explicit dispersion relations for warm fluid waves in a uniform plasma", J. Korean Phys. Soc. 82 (2023) 740 (invited talk)

• Seokyong Jeong, Woojin Nam, Seungbo Shim, and Gunsu Yun*, "Investigation of the afterpeaks in pulsed microwave argon plasma at atmospheric pressure", Plasma Sources Sci. Tech. 32 (2023) 015003

• Seokyong Jeong, Jimo Lee, and Gunsu Yun*, "General parametric dependence of atmospheric pressure argon plasmas", J. Korean Phys. Soc. 82 (2023) 32

[2022]

• Kyung-Tae Kim, Woojin Nam, Seungtaek Lee, Jimo Lee, Seungbo Shim, and Gunsu S. Yun*, "Mode transition (α − γ) and hysteresis in microwave-driven low-temperature plasmas", Plasma Sources Sci. Tech. 31 (2022) 105006

• Minuk Lee*, Gunsu S. Yun*, and Jeong-Young Ji*, "Dispersion relation and instability for an anisotropic non-uniform flowing plasma",  Plasma Phys. Control. Fusion 64 (2022) 125003

• Minjun Choi*, et al., "Stochastic fluctuation and transport of tokamak edge plasmas with the resonant magnetic perturbation field", Phys. Plasmas 29 (2022) 122504

• Seungjun Lee, Jimo Lee, Woojin Nam, and Gunsu Yun*, "Enhanced production of hydroxyl radicals in plasma-treated water via a negative DC bias coupling", J. Phys. D: Applied Physics 55 (2022) 455201

• Hyeon K. Park, Minjun J. Choi, Minho Kim, Minwoo Kim, Jaehyun Lee, Dongjae Lee, Woochang Lee, and Gunsu Yun, "Advances in physics of the magneto-hydro-dynamic and turbulence-based instabilities in toroidal plasmas via 2-D/3-D visualization", Reviews of Modern Plasma Physics 6 (2022) 18

• Seungtaek Lee, Juho Lee, Young Dae Yoon, Dong Eon Kim, and Gunsu Yun*, "Characterization of strongly coupled plasmas produced in argon supercritical fluids", Plasma Phys. Control. Fusion 64 (2022) 095010

• BCG Reman et al., "First observation and interpretation of spontaneous collective radiation from fusion-born ions in a stellarator plasma",  Plasma Phys. Control. Fusion 64 (2022) 085008

• Minuk Lee, Jeong-Young Ji*, and Gunsu Yun*, "Nonlinear harmonics coupled by parallel wave propagations in a time-dependent plasma flow", Plasma Phys. Control. Fusion 64 (2022) 055005

• Gwan Hui Lee et al., "W-band Modular Antenna/Detector Array for the Electron Cyclotron Emission Imaging System in KSTAR", Appl. Sci. 12 (2022) 2431

[2021]

• Jaemin Yoo, Dongkyu Lee, Jimo Lee, Taehyeong Kim, Hyunggyu Jin*, and Gunsu S. Yun*, "Catalytic effect of laser-combined atmospheric pressure plasma in lowering the reduction temperature of hematite", RSC Advances 11 (2021) 35489

• Jimo Lee and Gunsu Yun*, "Tunable microwave plasma coaxial resonator", AIP Advances 11 (2021) 105014. Editor's Pick

• Seungtaek Lee, Juho Lee, Yeonguk Kim, Seokyong Jeong, Dong Eon Kim*, and Gunsu Yun*, "Quasi-equilibrium phase coexistence in single-component supercritical fluids", Nature Comm. 12 (2021) 4630

• Jeong-Young Ji*, Min Uk Lee, Eric D. Held, and Gunsu S. Yun, "Moments of the Boltzmann collision operator for Coulomb interactions", Phys. Plasmas 28 (2021) 072113

• Young Dae Yoon*, Gunsu Yun*, Deirdre Wendel, and James Burch, "Collisionless Relaxation of a Disequilibrated Current Sheet and Implications for Bifurcated Structures", Nature Comm. 12 (2021) 3774

• Young Dae Yoon*, Jeong-Young Ji, and Gunsu S. Yun, "Deterministic Scattering of Relativistic Electron Beams by Off-Resonant Circularly Polarized Electromagnetic Waves", Phys. Plasmas  28 (2021) 060702

• Min Uk Lee, Shekar G Thatipamula, Sehyun Bae, Jayhyun Kim, Jaewook Kim, Michael Lehnen, and Gunsu S Yun*, "Radiation Measurement in Plasma Disruption by Thin-foil Infrared Bolometer", Rev. Sci. Instrum. 92 (2021) 053536

• Reman, Bernard; Dendy, Richard; Akiyama, Tsuyoshi; Chapman, Sandra; Cook, James; Igami, Hiroe; Inagaki, Shigeru; Saito, Kenji; Seki, Ryosuke; Kim, Minho; Thatipamula, Shekar; Yun, Gunsu, "Density dependence of ion cyclotron emission from deuterium plasmas in the Large Helical Device", Nuclear Fusion 61 (2021) 066023

• Jieun Lee,  P.H. Seo, J.G. Bak, and Gunsu S. Yun*, "A machine learning approach to identify the solitary perturbation as a boundary burst trigger in magnetized toroidal plasmas" Scientific Reports 11 (2021) 3662

• Minjun Choi, Laszlo Bardoczi, Jae-Min Kwon, Taik Soo Hahm, Hyeon Park, Jayhyun Kim, Minho Woo, Byoung-Ho Park, Gunsu Yun, Eisung Yoon, and George McKee, "Effects of plasma turbulence on the nonlinear evolution of magnetic island in tokamak", Nature Comm. 12, (2021) 375

[2020]

• Seungtaek Lee, Juho Lee, Yeonguk Kim, Seok Jeong, Dong Eon Kim, Gunsu Yun*, "Quasi-equilibrium phase separation in supercritical fluids", preprint at Research Square

• Lee, Min Uk; Ji, Jeong-Young; Yun, Gunsu*, "Cold-hot coupled waves in a flowing magnetized plasma" Nuclear Fusion 60 (2020) 126036

• Kim, Minho; Thatipamula, Shekar; Kim, Jayhyun; Choi, Minjun; Lee, Jaehyun; Lee, Woochang; Kim, Minwoo; Yoon, Youngdae; Yun, Gunsu*, "Intense whistler-frequency emissions at the pedestal collapse in KSTAR H-mode plasmas" Nuclear Fusion 60 (2020) 126021

• Thatipamula, Shekar; Kim, Minho; Kim, Jayhyun; Kim, Junghee; Yun, Gunsu*,  "Radio frequency emissions driven by energetic ions from neutral beam in KSTAR low confinement mode plasma"   Plasma Phys. Control. Fusion 62 (2020) 035004

• Na, Yong-Su*.... Yun, Gunsu, "On hybrid Scenarios in KSTAR"  Nuclear Fusion 60 (2020) 086006

• Wonseok Kim, Jungeun Lee, Gunsu Yun, Gun Yong Sung, and Sung Jae Kim*, "Direct Visualization of Perm-Selective Ion Transportation", Scientific Reports 10 (2020) 8898. 

[2019]

• Lee, Jimo; Kim, Won Seok; Bae, Ki Beom; Yun, Gunsu*; Lee, Jae Koo*, "Variation of Physical Parameters and Anomalous Healing Observation in Plasma Wound Healing", IEEE Transactions on Plasma Science 47 (2019) 4833

• KIM Gnan,  YUN  Gunsu S.*, WOO Minho, and KSTAR team, "Mitigation of sawtooth crash as a manifestation of MHD mode coupling prior to disruption of KSTAR plasma"    Plasma Phys. Control. Fusion 60 (2019) 035009

• LEEM Jun-eok., JO Jawon, and Yun Gunsu S.*, "Semi-Analytic Shape Function of High-Harmonic Electron Cyclotron Emission in Magnetically Confined Plasma" , Phys. Plasmas 26 (2019) 043303

• Choi, Minjun J.;...; Yun, Gunsu S.; and KSTAR team, "Experimental observation of the non-diffusive avalanche-like electron heat transport events and their dynamical interaction with the shear flow structure", Nuclear Fusion 59 (2019) 086027 

• Chapman, Benjamin; Dendy, Richard; Chapman, Sandra; McClements, Kenneth; Yun, Gunsu; Thatipamula, Shekar; Kim, Minho,  "Interpretation of suprathermal emission at deuteron cyclotron harmonics from deuterium plasmas heated by neutral beam injection in the KSTAR tokamak",  Nuclear Fusion 59 (2019) 106021

• Reman, Bernard; Dendy, Richard; Akiyama, Tsuyoshi; Chapman, Sandra; Cook, James; Igami, Hiroe; Inagaki, Shigeru; Saito, Kenji; Yun, Gunsu, "Interpreting observations of ion cyclotron emission from Large Helical Device plasmas with beam-injected ion populations", Nuclear Fusion 59 (2019) 096013

• Kim M, Park HK, Lee J, Yun GS, Xu XQ, and Becoulet M, "BOUT++ nonlinear simulation for a comparative study with the measured 2D ELM structures in the KSTAR H-mode plasma" Phys. Plasmas 26 (2019) 052502

• LEE Jaehyun, JEON Young Mu, IN Yongkyoon, PARK Gunyoung, YUN Gunsu S., LEE Woochang, KIM Minwoo, LEE Jongha, KO WonHa, PARK Hyeon K., "Direct Evidence of E×B Flow Changes at the Onset of RMP-driven ELM-Crash Suppression"  Nuclear Fusion 59 (2019) 066003

• Park HK, ..., Yun GS, "Overview of KSTAR research progress and future plans toward ITER and K-DEMO", Nuclear Fusion 59 (2019) 112020

[ 2018 ] 

• Lee W et al., "Quasi-coherent fluctuation measurement with the upgraded microwave imaging reflectometer in KSTAR '' , Plasma Phys. Control. Fusion 60 (2018) 115009

• Choe GH, Yun GS*, Park HK, and Jeong JH, "Slow crash in modified sawtooth patterns driven by localized electron cyclotron heating and current drive in KSTAR", Nuclear Fusion 58 (2018) 106038

• Nam WJ, Jeong SY, Lee JK, and Yun GS*, "Intensification of Atomic and Continuum Emissions in Pulsed Microwave Plasmas at Atmospheric Pressure", J. Phys. D. 51 (2018) 444001

• Jeong SY, Nam WJ, Lee JK*, and Yun GS*, "Dependence of Reactive Species Generation on Microwave Pulse Parameters in the Atmospheric Argon/Oxygen Plasma",  J. Phys. D. 51 (2018) 454001

• Lee Jimo, Nam WJ, Lee ST, Lee JK, and Yun GS*, "Sheath and bulk expansion induced by RF field in atmospheric pressure microwave plasma", Plasma Sources Sci. Technol. 27  (2018) 075008

• Nam YB et al. "Condition of the core magnetic shear for the sawtooth oscillation in KSTAR", submitted.

• Minho Kim, Shekar G. Thatipamula, Jieun Lee, Minjun J. Choi, Hyeon K. Park, Tsuyoshi Akiyama, Gunsu S. Yun*, "Distinct stages of radio frequency emission at the onset of pedestal collapse in KSTAR H-mode plasmas", Nuclear Fusion 58 (2018) 096034 (also https://arxiv.org/abs/1803.09376 )

• B. Chapman, Dendy RO, Chapman SC, McClements KG, Yun GS, Thatipamula SG, and Kim MH, "Nonlinear wave interactions generate high-harmonic cyclotron emission from fusion-born protons during a KSTAR ELM crash", Nuclear Fusion 58 (2018) 096027

• Pengfei Wei, Meiyan Qin, ..., Seok Yong Jeong, Gunsu S. Yun, and Dong Eon Kim*, "Probing electron–atom collision dynamics in gas plasma by high-order harmonic spectroscopy", Optics Letters 43 (2018) 1970-1973.

• Youngmin Oh, Hyung Ju Hwang, Michael Leconte, Minwoo Kim, and Gunsu S. Yun*, "Effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas", AIP Advances 8 (2018), 025224. 

• Kim, Gnan; Yun, Gunsu S.*; Woo, Minho; Park, Hyeon K., "Interactions of toroidally coupled tearing modes in the KSTAR tokamak", Plasma Phys. Control. Fusion 60 (2018) 035009.

• Lee, Jihun et al., "Observation of Electron Driven Quasi-Coherent Modes and their Connection with Core Intrinsic Rotation in KSTAR ECH and Ohmic L-Mode Plasmas", Phys. Plasmas 25 (2018) 022513

• Lee W et al., "Study of ion-gyroscale fluctuations in low-density L-mode plasmas heated by NBI on KSTAR", Nuclear Fusion 58 (2018) 046009.

• Y.B. Nam, J. Ko, G.H. Choe, Y.S. Bae, M.J. Choi, W. Lee, G.S. Yun, S.C. Jardin and H.K. Park, "Validation of the “full reconnection model” of the sawtooth instability in KSTAR", Nuclear Fusion 58 (2018),  066009

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[ 2017 ] 

• Jeong-Young Ji, Gunsu S. Yun, Yong-Su Na, and Eric D. Held, "Electron parallel transport for arbitrary collisionality", Phys. Plasmas. 24 (2017) 112121

• Min Uk Lee, Jae Ku Lee*, and Gunsu S. Yun*, "Generation of Energetic Electrons in Pulsed Microwave Plasmas", Plasma Processes and Polymers (2017) e1700124. [One of 20 most downed articles in 2018]

• M.J. Choi et al., "Multiscale interaction between a large scale magnetic island and small scale turbulence", Nuclear Fusion 57 (2017) 126058

• M. Becoulet, M. Kim, G. Yun, et al., "Non-linear MHD modelling of Edge Localized Modes dynamics", Nuclear Fusion  57 (2017) 116059.

• K. Tanaka, ..., G. Yun, "Collisionality dependence and ion species effects on heat transport in He and H plasma and the role of ion scale turbulence in LHD", Nuclear Fusion  57 (2017) 116005.

• K. Itoh, ..., G. Yun et al., "Hysteresis and Fast Timescale in Transport Relation of Toroidal Plasmas", Nuclear Fusion 57 (2017) 102021.

• T. Kobayashi, K. Ida, S. Inagaki, H. Tsuchiya, N. Tamura, G.H. Choe, G.S. Yun, et al., "Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak devices", Nuclear Fusion 57 (2017) 076013.

• Jieun Lee, Gunsu S. Yun*, W. Lee, M.H. Kim, M. Choi, J. Lee, M. Kim, H.K. Park, J.G. Bak, W.H. Ko, and Y.S. Park, "Solitary perturbations in the steep boundary of magnetized toroidal plasma", Scientific Reports 7 (2017) 45075: http://rdcu.be/qltx

• Min Uk Lee, Jimo Lee, Gunsu S. Yun*, and Jae Ku Lee*, "Scalings and universality for high-frequency excited high-pressure argon microplasma", Eur. Phys. J. D 71 (2017) 94: http://rdcu.be/rlQD

• Woojin Nam, Seugntaek Lee, Seok Young Jeong, Jae Ku Lee, and Gunsu S. Yun*, "Asymmetric frequency dependence of plasma jet formation in resonator electrode", Eur. Phys. J. D 71 (2017) 134 :http://rdcu.be/sZI3

• Seugntaek Lee, Woojin Nam, Jae Ku Lee, and Gunsu S. Yun*, "In-situ impedance measurement of microwave atmospheric pressure plasma", Plasma Sources Sci. Technol. 26  (2017) 045004

• Min Uk Lee, Jimo Lee, Jae Ku Lee*, and Gunsu S. Yun*, Corrigendum: Extended scaling and Paschen law for micro-sized radiofrequency plasma breakdown (2017 Plasma Sources Sci. Technol. 26 034003)

• Min Uk Lee, Jimo Lee, Jae Ku Lee*, and Gunsu S. Yun*, "Extended scaling and Paschen law for micro-sized radiofrequency plasma breakdown", Plasma Sources Sci. Technol. 26 (2017) 034003 

• MK Ayub, GS Yun*, W Lee, and HK Park, "Interpretation of electron cyclotron emission signal from optically marginal plasmas", J. Korean Phys. Soc. 70(3) (2017) 268-275 

• Y.S. Park, ..., G.S. Yun, "Investigation of instabilities and rotation alteration in high beta KSTAR plasmas", Phys. Plasmas 24 (2017) 012512

• B. Chapman, R.O. Dendy, K.G. McClements, S.C. Chapman, G.S. Yun, S.G. Thatipamula, M.H.Kim, "Sub-microsecond temporal evolution of edge density during edge localized modes in KSTAR tokamak plasmas inferred from ion cyclotron emission", Nuclear Fusion 57 (2017) 124004.

• B. Chapman et al., "Ion cyclotron emission (ICE) during ELM crashes in KSTAR tokamak plasmas resolves local density changes on very fast time scales", 44th EPS Conference on Plasma Physics (2017) P4.401: http://ocs.ciemat.es/EPS2017PAP/pdf/P4.401.pdf

• R.O. Dendy et al., "Modelling ion cyclotron emission from beam-injected ions in magnetic confinement fusion plasmas", 44th EPS Conference on Plasma Physics (2017) P5.145: http://ocs.ciemat.es/EPS2017PAP/pdf/P5.145.pdf

Arxiv:

• Youngmin Oh, Gunsu S. Yun, and Hyung Ju Hwang, "Mathematical analysis of long-time behavior of magnetized fluid instabilities with shear flow": https://arxiv.org/abs/1706.08036 

• M.J. Choi et al., "Coupled evolution of temperature and flow profiles and turbulence near the magnetic island": https://arxiv.org/abs/1705.09487.

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[ 2016 IAEA Fusion Energy Conference (accepted papers)] 

• Gunsu Yun et al., "Edge-localized modes on KSTAR: global structure and distinct evolution stages involving quasi-steady state and phase transitions"

• Jaehyun Lee et al., "ELM, Edge Turbulence and Their Interaction in the ELM-crash Suppression Phase under the n=1 RMP"

• Minwoo Kim et al., "Study of Nonlinear Phase of the ELMs by Comparison between ECEI ELM Observation and Nonlinear MHD Simulations"

• Minjun Choi et al., "Study of the Locked Mode Disruption with the 3-D Imaging Data in KSTAR"

• Woochang Lee et al., "Ion-Scale Turbulence Study in KSTAR L-Mode Plasmas"

• Hyeon K. Park et al., "Validation of q(0)≥1.0 in the MHD Quiescent Time after Crash of the Sawtooth Instability in KSTAR"

• Marina Becoulet et al., "Non-linear MHD modelling of Edge Localized Modes dynamics"

• Kimitaka Itoh et al., "Hysteresis and Fast Timescale in Transport Relation of Toroidal Plasmas"

• Sang Gon Lee et al., "Long-lived pressure-driven MHD mode in KSTAR plasmas"

• Young-Seok Park et al., "Investigation of MHD Stability in KSTAR High Normalized Beta Plasmas"

• Rodolphe D'Inca et al., "Multi-machine experimental investigation of ion cyclotron emission"

[ 2016 ] 

• J Lee, GS Yun*, W Lee et al., "Nonlinear interaction of edge-localized modes and turbulent eddies in toroidal plasma under n=1 magnetic perturbation”, Phys. Rev. Lett. 117, 075001 (2016)

• MU Lee, SY Jeong, IH Won, SK Sung, GS Yun*, and JK Lee*, "Non-Maxwellian to Maxwellian transitions of atmospheric microplasmas at microwave frequencies", Phys. Plasmas 23, 070704 (2016)

• Sang Gon Lee, J Seol, HH Lee, A Aydemir, L Terzolo, KD Lee, YS Bae, JG Bak, GH Choe, GS Yun, and JW Yoo, "Long-lived pressure-driven coherent structures in KSTAR plasmas", Phys. Plasmas 23, 052511 (2016)

• M Leconte*, YM Jeon, and GS Yun, "Ginzburg-Landau model in a finite shear-layer and onset of transport barrier nonlinear oscillations: a paradigm for type-III ELMs", Contributions to Plasma Physics 56 (2016) 736-741

• W. Lee*, J. Leem, GS Yun, et al., "Ion gyroscale fluctuation measurement with microwave imaging reflectometer on KSTAR"  Rev. Sci. Instrum.. 87, 11E134 (2016)

• YB Nam, DJ Lee, J Lee, C Kim, GS Yun, W. Lee, HK Park,  "New compact and efficient local oscillator optic system for the KSTAR electron cyclotron emission imaging system", Rev. Sci. Instrum. 87, 11E1370(2016).

• W. Lee*, J. Leem, GS Yun, et al., "E x B flow velocity deduced from the poloidal motion of fluctuation patterns in neutral beam injected L-mode plasmas on KSTAR,"  Phys. Plasmas 23, 052510 (2016).

• MJ Choi, HK Park, GS Yun, et al.,  "Post calibration of the two-dimensional electron cyclotron emission imaging instrument with electron temperature characteristics of the magnetohydrodynamic instabilities", Rev. Sci. Instrum. 87, 013506 (2016).

• Y.J. Shi, ..., GS Yun, et al., "Toroidal rotation profile structure in KSTAR L-mode plasmas with mixed heating by NBI and ECH", Nuclear Fusion 56, 016014 (2016).

• SG Thatipamula, GS Yun*, et al., "Dynamic spectra of radio frequency bursts from high-confinement-mode plasma at KSTAR tokamak," Plasma Physics and Controlled Fusion 58, 065003  (2016).

• MK Ayub, GS Yun*, J. Leem, M. Kim, W. Lee and H. K. Park, "Estimation of the radial size and density fluctuation amplitude of edge localized modes using microwave interferometer array", J. Instrumentation 11 (03):T03006-T03006 (2016)

[ 2015 ] 

• Jieun Lee, GS Yun*, et al., "Toroidal mode number transition of the edge localized modes in the KSTAR plasmas,"  Nuclear Fusion 55, 113035 (2015).

• M Kim, J Lee, HK Park, GS Yun, W. Lee, C.W. Domier, N.C. Luhmann, Jr., and KSTAR team,  "Multimode excitation during the inter-ELM-crash periods in KSTAR H-mode plasma", Nuclear Fusion 55, 073001 (2015)

• SK Kang, HY Kim, GS Yun*, and JK Lee*, "Portable microwave air plasma device for wound healing", Plasma Sources Sci. Technol. 24, 035020 (2015)

• Kyungjin Kim, Yong-Su Na, Minhwa Kim, Y.M. Jeon, K.D. Lee, J.G. Bak, M.J. Choi, G.S. Yun, S.G. Lee, S. Park, J.H. Jeong, L. Terzolo, D.H. Na, M.G. Yoo, and KSTAR team, "Experiment and Simulation of Tearing Mode Evolution with Electron Cyclotron Current Drive in KSTAR", Current Appl. Physics 15, 547 (2015)

• HWk Lee; MS Kim, IH Won, GS Yun, and JK Lee*, "Self-prevention of instability in a low-power microwave Ar plasma jet for biomedical applications", Journal of Physics D: Applied Physics 48, 155203 (2015)

• GH Choe, GS Yun*, Y Nam, W Lee, HK Park, A Bierwage, CW Domier, NC Luhmann, Jr., JH Jeong, YS Bae, "Dynamics of multiple flux tubes in sawtoothing KSTAR plasmas heated by electron cyclotron waves: I. Experimental analysis of the tube structure", Nuclear Fusion 55, 013015 (2015)

• A. Bierwage, GS Yun, GH Choe, Y. Nam, W. Lee, HK Park, and YS Bae, "Dynamics of multiple flux tubes in sawtoothing KSTAR plasmas heated by electron cyclotron waves: II. Theoretical and numerical analysis", Nuclear Fusion 55, 013016 (2015)

[ 2014 ] 

• GS Yun*, W Lee, MJ Choi, J Lee, M Kim, J Leem, YB Nam, G Choe, HK Park, D Woo, KW Kim, CW Domier, NC Luhmann, Jr., N Ito, A Mase, SG Lee, "Quasi 3-D ECE Imaging System for Study of MHD instabilities in KSTAR," Rev. Sci. Instrum. 85, 11D820 (2014).

• M Kim, MJ Choi, GS Yun, W Lee, HK Park, CW Domier, NC Luhmann, Jr., XQ Xu, "Comparison of measured 2D ELMs with synthetic images from BOUT++ simulation in KSTAR," Nuclear Fusion 54, 093004 (2014).

• W Lee, GS Yun, HK Park, YB Nam, CR Seon, "The conceptual design of electron cyclotron emission imaging system for studying ITER-like high temperature plasmas," Plasma Phys. Control. Fusion 56, 095017 (2014)

• J Lee, GS Yun*, JE Lee, M Kim, MJ Choi, W Lee, HK Park, CW Domier, NC Luhmann, Jr., SA Sabbagh, YS Park, SG Lee, and JG Bak, "Toroidal mode number estimation of the edge-localized modes using the KSTAR 3-D electron cyclotron emission imaging system," Rev. Sci. Instrum. 85, 063505 (2014) 

• MJ Choi, GS Yun, W Lee, HK Park, YS Park, SA Sabbagh, KJ Gibson, C Bowman, CW Domier, NC Luhmann, Jr., JG Bak, SG Lee, and the KSTAR Team,"Improved accuracy in the estimation of the tearing mode stability parameters (∆.' and wc) using 2D ECEI data in KSTAR," Nuclear Fusion 54, 083010 (2014)

• CW Myung, IH Won, HY Kim, JS Lee, GS Yun, and JK Lee, "Finite Amplitude Effects on Landau Damping and Diminished Transportation of Trapped Electrons," J. Phys. Soc. Japan 83, 074502 (2014)

• W Lee, J Leem, JA Lee, YB Nam, M Kim, GS Yun, HK Park, YG Kim, H Park, KW Kim, CW Domier, NC Luhmann, Jr., KD Lee, YU Nam, WH Ko, JH Jeong, YS Bae, and the KSTAR team, "Microwave imaging reflectometry for density fluctuation measurement on KSTAR," Nuclear Fusion 54 023012 (2014)

• J Leem, W Lee, M Kim, JA Lee, Y Nam, GS Yun*, HK Park, YG Kim, H Park, KW Kim, CW Domier, and NC Luhmann, Jr., "2D Microwave Imaging Reflectometry (MIR) in KSTAR," JPS Conf. Proc. 1, 015028 (2014)

• HK Park, J Lee, GS Yun, M Kim, MJ Choi, W Lee, CW Domier, NC Luhmann, Jr., YM Jeon, SG Lee, XQ Xu, and the KSTAR team, "Enhanced  Understanding  of  MHD  Dynamics and ELM Control Physics via 2D/3D ECE Imaging in KSTAR," JPS Conf. Proc. 1, 015004 (2014)

[ 2013 ] 

• W Lee, J Leem, GS Yun, HK Park, JA Lee, YB Nam, YU Nam, WH Ko, JH Jeong, YS Bae, H Park, KW Kim, CW Domier, NC Luhmann, Jr., "Poloidal rotation velocity measurement with an MIR system on KSTAR," J. Instrum. 8, C10018 (2013)

• Y.S. Park, S.A. Sabbagh, ..., M.J. Choi, G.S. Yun, H.K. Park, et al., "Inverstigation of MHD instabiities and control in KSTAR preparing for high beta operation" Nuclear Fusion 53, 083029 (2013)

• Jong-Gu Kwak, ..., W. Lee,..., H. Park, ..., G.S. Yun, et al.,"An overview of KSTAR results" Nuclear Fusion 53, 104005 (2013)

[ 2012 ] 

• GS Yun, HK Park, W Lee, MJ Choi, GH Choe, S Park, YS Bae, KD Lee, SW Yoon, YM Jeon, CW Domier, NC Luhmann, Jr., B Tobias, AJH Donne, "Appearance and Dynamics of Helical Flux Tubes under Electron Cyclotron Resonance Heating in the Core of KSTAR Plasmas," Phys. Rev. Lett. 109, 145003 (2012)

• GS Yun, W Lee, MJ Choi, J Lee, HK Park, CW Domier, NC Luhmann, Jr., B Tobias, AJH. Donne, JH Lee, YM Jeon, SW Yoon, and KSTAR team, "Two-dimensional imaging of edge-localized modes in KSTAR plasmas unperturbed and perturbed by n=1 external magnetic fields," Phys. Plasmas 19, 056114 (2012)

• YM Jeon, J-K. Park, SW Yoon, WH Ko, SG Lee, KD Lee, GS Yun, YU Nam, WC Kim, JG Kwak, KS Lee, HK Kim, and HL Yang, "Suppression of Edge Localized Modes in High-Confinement KSTAR Plasmas by Nonaxisymmetric Magnetic Perturbations", Phys. Rev. Lett. 109, 035004 (2012)

• J Seol, SG Lee, BH Park, HH Lee, L Terzolo, KC Shaing, KI You, GS Yun, CC Kim, KD Lee, WH Ko, JG Kwak, WC Kim, YK Oh, JY Kim, SS Kim, and K Ida, "Effects of Electron-Cyclotron-Resonance-Heating-Induced Internal Kink Mode on the Toroidal Rotation in the KSTAR Tokamak," Phys. Rev. Lett. 109, 195003 (2012)

• J Leem, GS Yun*, and HK Park, "Development of fast RF spectrometer system for MHD detection," JINST 7, C01042 (2012)

• J Lee, GS Yun*, M Kim, W Lee, and HK Park, "Large-Aperture Broadband Polarization Rotator for the KSTAR ECE Imaging System," JINST 7, C01037 (2012)

• GS Yun, MJ Choi, W Lee, HK Park, CW Domier, and NC Luhmann, Jr., "High contrast 2D visualization of edge plasma instabilities by ECE imaging," JINST 7, C01024 (2012)

• I Hong, W Lee, J Leem, Y Nam, M Kim, GS Yun, HK Park, CW Domier, and NC Luhmann, Jr., "Evaluation of the imaging properties of Microwave Imaging Reflectometry," JINST 7, C01077 (2012)

• W Lee, I Hong, J Leem, M Kim, Y Nam, GS Yun, HK Park, YG Kim, KW Kim, CW Domier, and NC Luhmann, Jr., "Microwave imaging reflectometry for KSTAR," JINST 7, C01070 (2012)

• Y Nam, W Lee, GS Yun, HK Park, D Elbeze, JL Segui, R Sabot, JP Chenevoix, "Design of the reflective optics for Tore Supra ECEI system," Rev. Sci. Instrum. 83, 10E318 (2012)

• A Mase, ..., HK Park, G Yun, W Lee, S Padhi and KW Kim, "Reflectometric measurement of plasma imaging and applications," JINST 7, C01089 (2012).

• Jayhyun Kim, Y-M Jeon, WW Xiao, S-W Yoon, J-K Park, GS Yun, ..., GH Choe, ..., HK Park, et al., "ELM control experiments in the KSTAR device," Nuclear Fusion 52, 114011 (2012)

[ 2011 ]

• GS Yun, W Lee, MJ Choi, HK Park, B Tobias, CW Domier, NC Luhmann, Jr., AJH Donne, JH Lee, and KSTAR Team, "Two-Dimensional Visualization of Growth and Burst of the Edge-Localized Filaments in KSTAR H-mode Plasmas," Phy. Rev. Lett. 107, 045004 (2011)

• BJ Tobias, CW Domier, NC Luhmann, Jr., JE Boom, IGJ Classen, AJH. Donne, G Yun, HK Park, and RM Nazikian, "Sawtooth Precursor Oscillations on DIII-D," IEEE Transactions on Plasma Science 39, 3022 (2011)

• SW Yoon, ..., GS Yun, ..., HK Park, et al., "Characteristics of the first H-mode discharges in KSTAR," Nuclear Fusion 51, 113009 (2011)

• B. Tobias, ..., HK Park, ..., GS Yun, and DIII-D Team, "On the application of electron cyclotron emission imaging to the validation of theoretical models of magnetohydrodynamic activity," Phys. Plasmas 18, 056107 (2011)

[ 2010 ]

• GS Yun, W Lee, MJ Choi, JB Kim, HK Park, CW Domier, B Tobias, T Liang, X Kong, NC Luhmann, Jr., and AJH Donne, "Development of KSTAR ECE imaging system for measurement of temperature fluctuations and edge density fluctuations," Rev. Sci. Instrum. 81, 10D930 (2010)

• MJ Choi, GS Yun, HK Park, YM Jeon, and SH Jeong, "Relatively scaled ECE temperature profiles of KSTAR plasmas," Rev. Sci. Instrum. 81, 10D934 (2010)

• HK Park, I Hong, M Kim, GS Yun, W Lee, J Kim, B Tobias, CW Domier, NC Luhmann, Jr., and KW Kim, "Microwave imaging reflectometry studies for turbulence diagnostics on KSTAR," Rev. Sci. Instrum. 81, 10D933 (2010)

• W Lee, GS Yun, Y Nam, I Hong, JB Kim, HK Park, B Tobias, T Liang, CW Domier, and NC Luhmann, Jr., "Comparative study between the reflective optics and lens based system for microwave imaging system on KSTAR," Rev. Sci. Instrum. 81, 10D932 (2010)

• JB Kim, W Lee, GS Yun, HK Park, CW Domier, and NC Luhmann, Jr., "Data acquisition and processing system of the electron cyclotron emission imaging system of the KSTAR tokamak," Rev. Sci. Instrum. 81, 10D931 (2010)

• B Tobias, CW Domier, T Liang, X Kong, L Yu, GS Yun, H Park, IGJ Classen, JE Boom, AJH Donne, T Munsat, R Nazikian, M Van Zeeland, RL Boivin, and NC Luhmann, Jr., "Commissioning of electron cyclotron emission imaging instrument on the DIII-D tokamak and first data," Rev. Sci. Instrum. 81, 10D928 (2010)

• T Liang, B Tobias, X Kong, CW Domier, NC Luhmann, Jr., W Lee, GS Yun, and HK Park, "Innovations in optical coupling of the KSTAR electron cyclotron emission imaging diagnostic," Rev. Sci. Instrum. 81, 10D909 (2010)

• L Lei, B Tobias, CW Domier, NC Luhmann, Jr., GJ Kramer, EJ Valeo, W Lee, GS Yun, and HK Park, "A synthetic diagnostic for the evaluation of new microwave imaging reflectometry diagnostics for DIII-D and KSTAR," Rev. Sci. Instrum. 81, 10D904 (2010)

• T Munsat, CW Domier, X Kong, T Liang, NC Luhmann, Jr., BJ Tobias, W Lee, HK Park, G Yun, IGJ Classen, and AJH Donne, "Electron cyclotron emission imaging in tokamak plasmas," Applied Optics 49, E20 (2010)

• GS Yun and PM Bellan, "Plasma tubes becoming collimated as a result of magnetohydrodynamic pumping," Phys. Plasmas 17, 062108 (2010)