Design of ITER divertor VUV spectrometer and prototype test at KSTAR tokamak

Seon, C. R.; Hong, Jin; Song, In‐Hyuck; Jang, Juhyeok; Lee, Hyeon-Yong; An, Younghwa; Kim, Bosung; Jeon, Taemin; Park, Jae Sun; Choe, Wonho; Lee, Hyeon-Gon; Pak, S.; Cheon, MunSeong; Choi, Jaewon; Kim, Hyeonseok; Biel, W.; Bernascolle, Philippe; Barnsley, R.; O’Mullane, M.

doi:10.1140/epjd/e2017-70825-3

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…In KSTAR, several imaging diagnostics with tomographic reconstruction algorithms have been developed for impurity transport study [8][9][10][11], including the tungsten powder injection experiment. However, both the vacuum (VUV) and extreme ultraviolet (EUV) spectrometers [10,12] on KSTAR and the one planned for ITER [13], which have a capability of resolving the spatial distribution of line emissions, suffer from a limited viewing angle due to the narrow allocated space, which makes it difficult to accurately reconstruct the local emissivity profile of each line radiation from the chordintegrated data. The ITER VUV spectrometers are expected to employ 5 channels having different fields of view (FoVs) with different wavelengths [12][13][14].…”

Section: Local Profiles Of Line Emission Of Impurity Ions In Rotating...mentioning

confidence: 99%

“…However, both the vacuum (VUV) and extreme ultraviolet (EUV) spectrometers [10,12] on KSTAR and the one planned for ITER [13], which have a capability of resolving the spatial distribution of line emissions, suffer from a limited viewing angle due to the narrow allocated space, which makes it difficult to accurately reconstruct the local emissivity profile of each line radiation from the chordintegrated data. The ITER VUV spectrometers are expected to employ 5 channels having different fields of view (FoVs) with different wavelengths [12][13][14]. Therefore, inadequate lines of sight (LoSs) may lead to the inaccurate local profiles by using the conventional tomographic methods.…”

Section: Local Profiles Of Line Emission Of Impurity Ions In Rotating...mentioning

confidence: 99%

“…Two space-resolved spectrometers (compact advanced EUV spectrometer (CAES), and divertor VUV spectrometer) are in operation [10,12] on KSTAR for impurity study. As seen in figure 1(a), the viewing angles of the two spectrometers are relatively too narrow to achieve a quality inversion of the entire plasma cross-section when using the conventional tomographic techniques.…”

Section: Curvilinear Grid Of Pixels Based On the Magnetic Equilibriummentioning

confidence: 99%

“…As seen in figure 1(a), the viewing angles of the two spectrometers are relatively too narrow to achieve a quality inversion of the entire plasma cross-section when using the conventional tomographic techniques. The angular coverage of the ITER VUV diagnostics is also limited (21° spread angle) [12], and therefore care should be taken for reconstructing the emission data. To determine the solution, a priori information can be imposed.…”

Section: Curvilinear Grid Of Pixels Based On the Magnetic Equilibriummentioning

confidence: 99%

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Local profiles of line emission of impurity ions in rotating fusion plasmas

2020

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We analyze the poloidal distribution of impurity ions, such as C V, C VI and O VIII, in fast rotating KSTAR plasmas using the impurity emission lines in the 1–7 nm wavelength range obtained from the space-resolved extreme ultra violet spectrometer. This is aided particularly by a new tomographic reconstruction technique with limited viewing angles. The vacuum and extreme ultraviolet spectrometer system at ITER and its prototypes installed at KSTAR are one of the main diagnostic systems to monitor the impurity species in fusion plasmas; however, they have an insufficient field of view to utilize the conventional reconstruction method. The new algorithm developed in this work considers a curvilinear grid of pixels mapped onto the magnetic equilibrium and a weight factor considering toroidal rotational effect on impurity species. Validation tests with poloidally asymmetric images of synthetic plasma demonstrate that this method is highly useful for emission diagnostics that have a narrow field of view. The experimental results of the spatially resolved spectra from KSTAR plasma clearly show that even the light impurities such as carbon and oxygen are significantly affected by the toroidal rotation. Accordingly, the method is expected to be utilized for estimating the poloidal density profile of each charge state of an impurity species, which will play a key role in impurity transport studies.

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Section: Local Profiles Of Line Emission Of Impurity Ions In Rotating...mentioning

confidence: 99%

Section: Local Profiles Of Line Emission Of Impurity Ions In Rotating...mentioning

confidence: 99%

Section: Curvilinear Grid Of Pixels Based On the Magnetic Equilibriummentioning

confidence: 99%

Section: Curvilinear Grid Of Pixels Based On the Magnetic Equilibriummentioning

confidence: 99%

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Local profiles of line emission of impurity ions in rotating fusion plasmas

2020

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“…Murakami et al [16] presented a detailed collisional-radiative model for W 27+ , including a comprehensive set of excitation and recombination processes for plasma diagnostics. Further to this work, Seon et al [17] discussed progress on the design and development of an ITER diverter VUV spectrometer, particularly attuned to representative tungsten emission lines resulting from the tungsten diverter material. Its usefulness as a plasma diagnostic follows directly from the experimental and theoretical information on radiative transition probabilities.…”

Section: Summary Of Contributionsmentioning

confidence: 99%

Atomic and Molecular Data and their Applications

et al. 2018

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Abstract. This topical issue on Atomic and molecular data and their applications was motivated by the 10th International Conference on Atomic and Molecular Data (ICAMDATA 2016), which was held from September 26 to 29, 2016 in Gunsan, Republic of Korea. The topics of this issue reflect those of the conference program. The scientific papers in the topical issue cover the fields of atomic and molecular structure, radiative transitions, scattering processes, data base development, and the applications of atomic and molecular data to plasma modeling.

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Data acquisition and monitoring system for KSTAR VUV spectrometer systems

Kim

Shin

et al. 2022

Fusion Engineering and Design

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Design of ITER divertor VUV spectrometer and prototype test at KSTAR tokamak

Cited by 9 publications

References 11 publications

Local profiles of line emission of impurity ions in rotating fusion plasmas

Local profiles of line emission of impurity ions in rotating fusion plasmas

Atomic and Molecular Data and their Applications

Data acquisition and monitoring system for KSTAR VUV spectrometer systems

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