Search

Your search keyword '"Bak, Jun-Gyo"' showing total 15 results
Start Over Author "Bak, Jun-Gyo"
15 results on '"Bak, Jun-Gyo"'

2. Stochastic fluctuation and transport of tokamak edge plasmas with the resonant magnetic perturbation field

Author

Choi, Minjun J., Kwon, Jae-Min, Kim, Juhyung, Rhee, Tongnyeol, Bak, Jun-Gyo, Shin, Giwook, Kim, Hyun-Seok, Jhang, Hogun, Kim, Kimin, Yun, Gunsu S., Kim, Minwoo, Kim, SangKyeun, Kaang, Helen H., Park, Jong-Kyu, Lee, Hyung Ho, In, Yongkyoon, Lee, Jaehyun, Kim, Minho, Park, Byoung-Ho, and Park, Hyeon K.

Subjects
Physics - Plasma Physics
Abstract

We present that a statistical method known as the Complexity-Entropy analysis is useful to characterize a state of plasma turbulence and flux in the resonant magnetic perturbation (RMP) edge localized mode (ELM) control experiment. The RMP ELM suppression phase with the stochastic pedestal top temperature fluctuation can be distinguished from the natural ELM free phase with the chaotic fluctuation. It is discussed that the stochastic temperature fluctuation localized near the pedestal top can be originated from the narrow layer of the field penetration near the pedestal top. The forced magnetic island can emit the resonant drift wave of comparable sizes (relatively low-k) in the RMP ELM suppression phase, and it can results in the generation of stochastic higher wavenumber fluctuations coupled to tangled fields around the island. The analysis of the ion saturation current measurement around the main outer striking point on the divertor shows that it also becomes more stochastic as the stronger plasma response to the RMP field is expected.

Published
2021
Full Text
View/download PDF

11. Stochastic fluctuation and transport of tokamak edge plasmas with the resonant magnetic perturbation field

Author

Choi, Minjun J., primary, Kwon, Jae-Min, additional, Kim, Juhyung, additional, Rhee, Tongnyeol, additional, Bak, Jun-Gyo, additional, Shin, Giwook, additional, Kim, Hyun-Seok, additional, Jhang, Hogun, additional, Kim, Kimin, additional, Yun, Gunsu S., additional, Kim, Minwoo, additional, Kim, SangKyeun, additional, Kaang, Helen H., additional, Park, Jong-Kyu, additional, Lee, Hyung Ho, additional, In, Yongkyoon, additional, Lee, Jaehyun, additional, Kim, Minho, additional, Park, Byoung-Ho, additional, and Park, Hyeon K., additional

Published
2022
Full Text
View/download PDF

15. Improved accuracy in the estimation of the tearing mode stability parameters (Δ′ and wc) using 2D ECEI data in KSTAR.

Author

Choi, Minjun J, Yun, Gunsu S, Lee, Woochang, Park, Hyeon K, Park, Young-Seok, Sabbagh, Steve A, Gibson, Kieran J, Bowman, Christopher, Domier, Calvin W, Jr, Neville C Luhmann, Bak, Jun-Gyo, Lee, Sang G, and Team, the KSTAR

Subjects
PLASMA physics, ELECTRON temperature measurement, PLASMA stability, TEARING instability, HEAT equation
Abstract

The accuracy in estimation of two important tearing mode stability parameters (Δ′ and wc) is improved by employing two-dimensional (2D) ECE imaging data which help one to overcome the resolution limit of conventional one-dimensional data. The experimentally measured 2D images are directly compared with synthetic ones from a tearing mode Te model to estimate the parameters and an excellent agreement is achieved. The results imply that the observed tearing mode is classically stable but has non-negligible bootstrap current drive. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results