Diagnostics for first plasma and development plan on KSTAR

Lee, J. H.; Na, H. K.; Lee, S. G.; Bak, J. G.; Seo, D. C.; Seo, S. h.; Oh, Seung Tae; Ko, W. H.; Chung, Jae-Hoon; Nam, Y. U.; Lee, K. D.; Ka, E. M.; Oh, Y.K.; Kwon, M.; Jeong, Seung-Ho

doi:10.1063/1.3429942

Cited by 14 publications

(3 citation statements)

References 9 publications

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“…Our statistical analyses are focused on 0.9 < ψ N < 1.0 near the plasma edge, where ψ N is the normalized poloidal flux, which corresponds to the seventh (eighth) column of the BES channels for #18 296 and #18 396 (#18 306). A Mirnov coil located at the same toroidal position as the BES channels but separated by ∼50 cm from BES To perform various statistical analyses during the ELM crashes, we identify them by the D α monitor and filterscope (/TUBE07) measurements [39], as has been done for many other tokamaks [27,28]. ELMs in the D α signals are selected automatically using a prominence selection algorithm [40] (also known as a topographic prominence analysis [41,42]) which is widely used to classify summits in topography.…”

Section: Experimental Datamentioning

confidence: 99%

Nonlinear energy transfer from low frequency electromagnetic fluctuations to broadband turbulence during edge localized mode crashes

et al. 2020

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Long ELMy H-mode KSTAR discharges are used to show that low frequencies () of the ion-scale density fluctuations contain electromagnetic components that transfer energy from to higher frequency () fluctuations during ELM crashes via three-wave non-linear interactions. Such non-linear interactions are not observed during the inter-ELM phases. These observations suggest that investigations on the enhanced fluctuation and transport levels during ELM crashes require a careful analysis of the non-linear couplings between low frequency electromagnetic and broadband fluctuations in addition to other causes such as open (stochastic) magnetic fields and advective transport. Our results are based on conditionally ensemble-averaged second-order and third-order spectral analyses applied to 2, 660 ELMs obtained from three different KSTAR discharges to ensure statistical validity.

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Section: Experimental Datamentioning

confidence: 99%

Nonlinear energy transfer from low frequency electromagnetic fluctuations to broadband turbulence during edge localized mode crashes

et al. 2020

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“…A schematic view of the poloidal cross section of the KSTAR tokamak and most of the diagnostics for measurements discussed in this article are shown in figure 1 [10,11]. KSTAR is a medium sized tokamak with major and minor radii of 1.8 m and 0.5 m, respectively.…”

Section: Coherent Modes In Density Fluctuations In the Edge Plasmamentioning

confidence: 99%

Observation of modified divertor particle flux with coherent modes in KSTAR edge plasma

Thatipamula¹,

Kim²,

Bak³

et al. 2019

Plasma Phys. Control. Fusion

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The coherent modes in the edge plasma density of KSTAR high confinement mode plasma are found to affect the particle flux incident on the divertor. These coherent modes are synonymous with inter-edge-localized filamentary modes. The coherent structures that typically fall inside the fast toroidal rotation zone or toroidal rotation shear zone, undergo distortion and elongation followed by either breakage or significant modulation in the scrape-off layer (SOL) transport, possibly leading to the observed coherent fluctuations on the divertor slightly further (outward) from the outer strike point. The distorted coherent structures appear as spatially large sized in the poloidal plane and exhibit long range correlation in the edge plasma, extending into the scrapeoff layer in some cases. Further, the elongated structures possibly modify the particle flux at the plasma boundary after their onset, and lead to reduced particle flux close to the outer strike point. The coherent modes that occur with relatively smaller spatial size in the edge plasma density at the foot of the toroidal rotation zone do not show any noticeable modification in the particle flux on the divertor. The growth of coherent structures to a large spatial size and distortion is a possible consequence of the presence of strong toroidal flow or flow shear in the location of coherent modes and/or nonlinear evolution.

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“…The real-time control diagnostics have to operate with reliability and stable calibration and their output must be integrated into the control system in addition to providing data for physics analysis. Diagnostic systems for the first KSTAR experimental campaign were discussed previously [4]. In this paper, progresses and future plans of KSTAR diagnostics are introduced.…”

Section: Introductionmentioning

confidence: 99%

Overview and recent progress of KSTAR diagnostics

et al. 2022

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The 14th experimental campaign from the Korea Superconducting Tokamak Advanced Research (KSTAR) device has passed since the first experimental campaign was carried out in 2008. The basic diagnostic systems such as magnetic diagnostics, interferometer, inspection illuminator, visible spectrometer, ECE radiometer have been used for the first plasma experiment in KSTAR. Currently more than 50 diagnostic systems have been continuously installed including improved basic diagnostics and advanced imaging diagnostics in KSTAR. A recent progress and future plan of diagnostics for KSTAR are briefly discussed.

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Diagnostics for first plasma and development plan on KSTAR

Cited by 14 publications

References 9 publications

Nonlinear energy transfer from low frequency electromagnetic fluctuations to broadband turbulence during edge localized mode crashes

Nonlinear energy transfer from low frequency electromagnetic fluctuations to broadband turbulence during edge localized mode crashes

Observation of modified divertor particle flux with coherent modes in KSTAR edge plasma

Overview and recent progress of KSTAR diagnostics

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