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Electric Probe Measurements at Edge Region During H-Mode Discharges in KSTAR

Title
Electric Probe Measurements at Edge Region During H-Mode Discharges in KSTAR
Author
Keywords
Characteristics of SOL and divertor; Edge plasma; Fast reciprocating Langmuir probe assembly; Fixed edge Langmuir probe array; H-mode discharge; KSTAR; Radial flux due to electrical turbulence
Issue Date
2013-01
Publisher
Wiley
Citation
Contributions to Plasma Physics, January 2013, 53(1), p.69-74
Abstract
Electrical probe measurements are carried out at the scrape‐off‐layer (SOL) and divertor regions in order to investigate the characteristics of edge plasmas during H‐mode discharges in the Korea Superconducting Tokamak Advanced Research (KSTAR) device. Radial profiles of plasma parameters such as electron temperature Te, plasma density ne, and parallel flow velocity v‖ are measured by using a fast reciprocating Langmuir probe assembly (FRLPA) at the SOL region. From the FRLPA measurements, it is found that the decay length of temperature λTe and that of density λne are 2 ∼ 4 cm and 1 ∼ 3 cm, respectively. The magnitude of v‖ near the last closed flux surface (LCFS) is 4 ∼ 15 km/s. The radial flux due to edge turbulence at the SOL region is investigated by using spectra analysis on electrostatic fluctuation levels such as ion saturation current Ĩis and floating potential $\tilde{\rm V}_f$ obtained from the FRLPA measurement. The value of the flux is estimated as ∼ 1020 particle m−2 s −1 near the LCFS. The poloidal distribution of the ion saturation current density jis is measured by fixed edge Langmuir probe array (ELPA) at the divertor region, and it is found that the positions of strike points from the ELPA measurement agree well with those reconstructed from the EFIT result using magnetic diagnostic data. From the spectrum analysis on the ELPA measurements at the divertor region during edge localized modes (ELMs) control in the H‐mode discharges, it is observed that the magnitude of $\tilde{\rm j}_{is}$(ω) near strike point decreases when the ELMs are suppressed or mitigated (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
URI
https://onlinelibrary.wiley.com/doi/abs/10.1002/ctpp.201310012https://repository.hanyang.ac.kr/handle/20.500.11754/70659
ISSN
0863-1042
DOI
10.1002/ctpp.201310012
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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