Kyoung-Jae Chung
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View article: Discharge mode transition in partially magnetized E × B Penning discharge
Discharge mode transition in partially magnetized E × B Penning discharge Open
We investigate the discharge mode transition accompanied by a change in the global “discharge current oscillation” and the “azimuthally rotating spoke” in an E × B Penning discharge. It is observed in the experiments that large-scale (m=2,…
View article: Electrical conductivity of copper in the low temperature region of warm dense matter
Electrical conductivity of copper in the low temperature region of warm dense matter Open
In this study, electrical conductivity of copper in the low temperature part of a warm dense matter regime is investigated utilizing underwater electrical wire explosion. Specifically, for the vapor/plasma region with a density of ∼0.01 no…
View article: Generation of low-energy abundant electron energy probability functions using a magnetized plasma source
Generation of low-energy abundant electron energy probability functions using a magnetized plasma source Open
The generation of low-energy electrons is essential for the plasma source of the charge neutralizer system within the ion implanter process of semiconductors and displays, owing to their exceptional capability of being effectively transpor…
View article: SPH code development for X-pinch plasma simulation
SPH code development for X-pinch plasma simulation Open
We have developed the first smoothed particle hydrodynamics code for investigating X-pinch plasmas driven by pulsed power generators. To achieve the required code performance, we incorporated and discussed appropriate physics models capabl…
View article: Unintended gas breakdowns in narrow gaps of advanced plasma sources for semiconductor fabrication industry
Unintended gas breakdowns in narrow gaps of advanced plasma sources for semiconductor fabrication industry Open
Occurrence of unintended gas breakdown in the narrow gaps of plasma processing chambers is one of the critical challenges in developing advanced plasma sources. We present a combined experimental and theoretical study of unintended dischar…
View article: Liquid–vapor phase transition process during underwater electrical wire explosion
Liquid–vapor phase transition process during underwater electrical wire explosion Open
The liquid–vapor two-phase region has attracted the attention of various fundamental studies and applications. To explore the liquid–vapor two-phase region, underwater electrical wire explosion (UEWE) is a useful tool. In this work, we obs…
View article: Kinetic electron cooling in magnetic nozzles: experiments and modeling
Kinetic electron cooling in magnetic nozzles: experiments and modeling Open
As long-distance space travel requires propulsion systems with greater operational flexibility and lifetimes, there is a growing interest in electrodeless plasma thrusters that offer the opportunity for improved scalability, larger throttl…
View article: Estimation of plasma parameters of X-pinch with time-resolved x-ray spectroscopy
Estimation of plasma parameters of X-pinch with time-resolved x-ray spectroscopy Open
We estimate the parameters of a Cu plasma generated by an X-pinch by comparing experimentally measured x-rays with synthetic data. A filtered absolute extreme ultraviolet diode array is used to measure time-resolved x-ray spectra with a sp…
View article: Rotating spoke frequency in <i>E</i> × <i>B</i> penning source with two-ion-species plasma
Rotating spoke frequency in <i>E</i> × <i>B</i> penning source with two-ion-species plasma Open
In E B sources with different degrees of magnetization between electrons and ions, collisionless Simon–Hoh instability is prone to be induced, which may result in long-wavelength and low-frequency plasma oscillations along the azimuthal …
View article: Kinetic Electron Cooling in Magnetic Nozzles: Experiments and Modeling
Kinetic Electron Cooling in Magnetic Nozzles: Experiments and Modeling Open
As long-distance space travel requires propulsion systems with greater operational flexibility and lifetimes, there is a growing interest in electrodeless plasma thrusters that offer the opportunity of improved scalability, larger throttle…
View article: Discharge characteristics and dynamics of a magnetized current-carrying line-tied plasma
Discharge characteristics and dynamics of a magnetized current-carrying line-tied plasma Open
Discharge characteristics and dynamic behaviors of a current-carrying line-tied (screw pinch) plasma have been experimentally studied. Besides its compactness, the novelty of this design is to utilize a single plasma source for both arc di…
View article: Measurement on the electrical conductivity of copper along the binodal curve in warm dense regime
Measurement on the electrical conductivity of copper along the binodal curve in warm dense regime Open
This paper presents the electrical conductivity data of copper along the gas branch of the binodal curve in the warm dense matter (WDM) regime as a function of mass density and temperature. All data are obtained using the underwater wire e…
View article: Electric potential in partially magnetized <i>E</i> × <i>B</i> discharges
Electric potential in partially magnetized <i>E</i> × <i>B</i> discharges Open
Ability to control the electric potential inside the plasma is promising for various applications of E × B plasma because the trajectory of particles, which meets the desired purpose, is mainly determined by the drift motions in the extern…
View article: Dependence of the polytropic index of plasma on magnetic field
Dependence of the polytropic index of plasma on magnetic field Open
Determination of the polytropic index of plasma in a magnetic field provides description of plasma physics ranging from laboratory plasma in the Earth to black hole in the Universe. Accordingly, a lot of efforts have been devoted to reveal…
View article: Development of neutron time-of-flight measurement system for 1.7-MV tandem proton accelerator with lithium target
Development of neutron time-of-flight measurement system for 1.7-MV tandem proton accelerator with lithium target Open
In this study, we developed a neutron time-of-flight (nTOF) measurement system for a 1.7-MV tandem proton accelerator with a target covered with 300-nm-thick lithium (Li) layer. With implementation of beam chopping module after its ion sou…
View article: Numerical Simulation on the Formation and Pinching Plasma in X-pinch Wires on 2-D Geometry
Numerical Simulation on the Formation and Pinching Plasma in X-pinch Wires on 2-D Geometry Open
대기압의 백만 배 이상의 강한 압력(> 1 Mbar)이 물질에 가해지면 중성입자가 전리되어 플라즈마 상태로 변하는데, 이를 고에너지밀도 플라즈마라고 한다. 이러한 플라즈마는 물질에 레이저를 조사하여 압축하는 관성 압축과 강한 펄스전류로 유도되는 자기장을 활용하는 자장 압축 방식으로 구분되며, 이중 펄스전류에 의한 세선의 내폭 현상(implosion)을 활용하는 자장 압축은 관성 핵융합(ICF, inertial confi…
View article: Magnetic confinement and instability in partially magnetized plasma
Magnetic confinement and instability in partially magnetized plasma Open
Discharge with an external magnetic field is promising for various applications of low-temperature plasmas from electric propulsion to semiconductor processes owing to high plasma density. It is essential to understand plasma transport acr…
View article: Non-Maxwellian Electron Energy Probability Functions in an Indirectly Heated Cathode Bernas Source
Non-Maxwellian Electron Energy Probability Functions in an Indirectly Heated Cathode Bernas Source Open
The indirectly heated cathode (IHC) Bernas source is used in plasma process devices as it can produce a high current of desired ion species. The formation of various ion species is associated with the complex electron production mechanism …
View article: Time-dependent kinetic analysis of trapped electrons in a magnetically expanding plasma
Time-dependent kinetic analysis of trapped electrons in a magnetically expanding plasma Open
A deep understanding of the kinetic properties of the electrons in a magnetic nozzle (MN), which is attracting attention as an acceleration stage for thrusters, is of great significance as it directly contributes to the development of the …
View article: Thermodynamics of a magnetically expanding plasma with isothermally behaving confined electrons
Thermodynamics of a magnetically expanding plasma with isothermally behaving confined electrons Open
Thermodynamics of a magnetically expanding plasma (magnetic nozzle (MN)) has been investigated considering the existence of confined electrons bouncing back and forth inside a potential well formed by a combination of external magnetic fie…
View article: Enhanced shock wave generation via pre-breakdown acceleration using water electrolysis in negative streamer pulsed spark discharges
Enhanced shock wave generation via pre-breakdown acceleration using water electrolysis in negative streamer pulsed spark discharges Open
This paper presents a method for enhancement of shock waves generated from underwater pulsed spark discharges with negative (anode-directed) subsonic streamers, for which the pre-breakdown process is accelerated by preconditioning a gap wi…
View article: Kinetics of electrons and neutral particles in radio-frequency transformer coupled plasma H<sup>−</sup>ion source at Seoul National University
Kinetics of electrons and neutral particles in radio-frequency transformer coupled plasma H<sup>−</sup>ion source at Seoul National University Open
In volume production H ^− ion sources, control of electron temperature is essential due to its close correlation with the generation of vibrationally-excited hydrogen molecules in the driver region as well as the generation of H ^− ions by…
View article: Publisher’s Note: “Electron density profile measurements from hydrogen line intensity ratio method in Versatile Experiment Spherical Torus” [Rev. Sci. Instrum. 87, 11E540 (2016)]
Publisher’s Note: “Electron density profile measurements from hydrogen line intensity ratio method in Versatile Experiment Spherical Torus” [Rev. Sci. Instrum. 87, 11E540 (2016)] Open
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