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Modification of argon impurity transport by electron cyclotron heating in KSTAR H-mode plasmas
Hong, Joohwan,Henderson, S.S.,Kim, Kimin,Seon, C.R.,Song, Inwoo,Lee, H.Y.,Jang, Juhyeok,Park, Jae Sun,Lee, S.G.,Lee, J.H.,Lee, Seung Hun,Hong, Suk-Ho,Choe, Wonho International Atomic Energy Agency 2017 Nuclear fusion Vol.57 No.3
<P>Experiments with a small amount of Ar gas injection as a trace impurity were conducted in the Korea Superconducting Tokamak Advanced Research (KSTAR) H-mode plasma (<img ALIGN='MIDDLE' ALT='${{B}_{\text{T}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn001.gif'/> = 2.8 T, <img ALIGN='MIDDLE' ALT='${{I}_{\text{P}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn002.gif'/> = 0.6 MA, and <img ALIGN='MIDDLE' ALT='${{P}_{\text{NBI}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn003.gif'/> = 4.0 MW). 170 GHz electron cyclotron resonance heating (ECH) at 600 and 800 kW was focused along the mid-plane with a fixed major radial position of <img ALIGN='MIDDLE' ALT='$R$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn004.gif'/> = 1.66 m. The emissivity of the Ar<SUP>16+</SUP> (3.949 <img ALIGN='MIDDLE' ALT='${\mathring{\text{A}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn005.gif'/>) and Ar<SUP>15+</SUP> (353.860 <img ALIGN='MIDDLE' ALT='${\mathring{\text{A}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn006.gif'/>) spectral lines were measured by x-ray imaging crystal spectroscopy (XICS) and a vacuum UV (VUV) spectrometer, respectively. ECH reduces the peak Ar<SUP>15+</SUP> emission and increases the Ar<SUP>16+</SUP> emission, an effect largest with 800 kW. The ADAS-SANCO impurity transport code was used to evaluate the Ar transport coefficients. It was found that the inward convective velocity found in the plasma core without ECH was decreased with ECH, while diffusion remained approximately constant resulting in a less-peaked Ar density profile. Theoretical results from the NEO code suggest that neoclassical transport is not responsible for the change in transport, while the microstability analysis using GKW predicts a dominant ITG mode during both ECH and non-ECH plasmas.</P>
Design of ITER divertor VUV spectrometer and prototype test at KSTAR tokamak
Seon, Changrae,Hong, Joohwan,Song, Inwoo,Jang, Juhyeok,Lee, Hyeonyong,An, Younghwa,Kim, Bosung,Jeon, Taemin,Park, Jaesun,Choe, Wonho,Lee, Hyeongon,Pak, Sunil,Cheon, MunSeong,Choi, Jihyeon,Kim, Hyeonse Springer-Verlag 2017 The European physical journal. D, Atomic, molecula Vol.71 No.12
<P>Design and development of the ITER divertor VUV spectrometer have been performed from the year 1998, and it is planned to be installed in the year 2027. Currently, the design of the ITER divertor VUV spectrometer is in the phase of detail design. It is optimized for monitoring of chord-integrated VUV signals from divertor plasmas, chosen to contain representative lines emission from the tungsten as the divertor material, and other impurities. Impurity emission from overall divertor plasmas is collimated through the relay optics onto the entrance slit of a VUV spectrometer with working wavelength range of 14.6-32 nm. To validate the design of the ITER divertor VUV spectrometer, two sets of VUV spectrometers have been developed and tested at KSTAR tokamak. One set of spectrometer without the field mirror employs a survey spectrometer with the wavelength ranging from 14.6nm to 32nm, and it provides the same optical specification as the spectrometer part of the ITER divertor VUV spectrometer system. The other spectrometer with the wavelength range of 5-25nm consists of a commercial spectrometer with a concave grating, and the relay mirrors with the same geometry as the relay mirrors of the ITER divertor VUV spectrometer. From test of these prototypes, alignment method using backward laser illumination could be verified. To validate the feasibility of tungsten emission measurement, furthermore, the tungsten powder was injected in KSTAR plasmas, and the preliminary result could be obtained successfully with regard to the evaluation of photon throughput.</P>
Development of a particle injection system for impurity transport study in KSTAR.
Lee, H Y,Hong, Suk-Ho,Hong, Joohwan,Lee, Seung Hun,Jang, Siwon,Jang, Juhyeok,Jeon, Taemin,Park, Jae Sun,Choe, Wonho American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>A solid particle injection system is developed for KSTAR. The system has a compact size, compatibility with a strong magnetic field and high vacuum environment, and the capability to inject a small amount of solid particles with a narrow injection angle. The target flight-distance of 10 cm has been achieved with a particle loss rate of less than 10%. Solid impurity particles such as tungsten and carbon will be injected by this system at the midplane in KSTAR. The impurity transport feature will be studied with a soft X-ray array, a vacuum ultra-violet diagnostic, and Stand Alone Non-Corona code.</P>
Lee, Seung Hun,Jang, Juhyeok,Hong, Joohwan,Pacella, D,Romano, A,Gabellieri, L,Jang, Siwon,Kim, Junghee,Choe, Wonho American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>Four-array system of soft X-ray diagnostics was installed on KSTAR tokamak. Each array has 32 viewing chords of two photo-diode array detectors with spatial resolution of 2 cm. To estimate signals from the soft X-ray radiation power, typical ne, Te, and argon impurity line radiation profiles in KSTAR are chosen. The photo-diodes were absolutely calibrated as a function of the incident photon energy in 2-40 keV range with a portable X-ray tube. Two-dimensional Te image properties by multi-energy method were simulated and visualized with six combinations of beryllium filter sets within the dynamic range of signal ratio.</P>
Study of fibroblast growth factor 2 administration in bleomycin induced pulmonary fibrosis mice
Se Bi Lee,Hyeokku Lee,Jungyu Baek,Eunhyeok Choi,Hyunseung Lee,Juhyeok Hong,Jaehyun Kim,Jeong Yun Park,Gichang Jeong,Jieun Jeon,Jooyeon Lee,Jaehyun Park,Jimin Jang,Sang-Ryul Cha,Se-Ran Yang 한국실험동물학회 2023 한국실험동물학회 학술발표대회 논문집 Vol.2023 No.2
Siwon Jang,Sang Gon Lee,Chang Hwy Lim,Hyun Ok Kim,Sang Yeol Kim,Seung Hun Lee,Joohwan Hong,Juhyeok Jang,전태민,문명국,최원호 한국물리학회 2013 Current Applied Physics Vol.13 No.5
An advanced tangential X-ray pinhole camera (TXPC) has been developed for KSTAR by utilizing a 2-D duplex multi-wire proportional counter (MWPC) detector. The KSTAR MWPC employs a 2-D parallel type readout system for high temporal resolution and adopts a duplex type for the capability of electron temperature measurement via the multi-color method. This paper presents the performance test result of the developed MWPC system utilizing a Fe-55 X-ray source. As a preliminary experimental result from the 2012 KSTAR campaign, the clear presentation of sawtooth activities and its frequency change, and 2-D plasma images during the vertical disruption event are given.