dc.citation.conferencePlace |
BE |
- |
dc.citation.title |
43rd European Physical Society Conference on Plasma Physics |
- |
dc.contributor.author |
Park, Hyeon Keo |
- |
dc.contributor.author |
Lee, JH |
- |
dc.contributor.author |
Yun, GS |
- |
dc.contributor.author |
Lee, JE |
- |
dc.contributor.author |
Lee, W |
- |
dc.contributor.author |
Jeon, YM |
- |
dc.date.accessioned |
2023-12-19T20:36:29Z |
- |
dc.date.available |
2023-12-19T20:36:29Z |
- |
dc.date.created |
2017-01-10 |
- |
dc.date.issued |
2016-07-08 |
- |
dc.description.abstract |
Following the first operation of H-mode in KSTAR in 2009, study of the edge localized modes (ELM) has been actively conducted. A unique in-vessel control coil (IVCC) set (top,middle and bottom) capable of generating resonant (and non-resonant) magnetic perturbation (RMP) at low n(=1,2) number was successfully utilized to suppress and/or mitigate the ELM-crash [1] in KSTAR. Extensive study of dynamics of the ELMs in both pre-crash and crash suppressed phase under magnetic perturbation with the 2D/3D Electron Cyclotron Emission Imaging (ECEI) system revealed new phenomenology of the ELMs and ELM-crash dynamics that were not available from conventional diagnostics. Since the first 2D images of the ELM time evolution from growth to crash through saturation [2], the detailed images of the ELMs leading to the crash together with the fast RF emission (<200MHz) signal demonstrated that the pre-crash events are complex. The measured 2D image of the ELM was validated by direct comparison with the synthetic 2D image by the BOUT++ code [3] and non-linear modelling study is in progress. Recently, the observed dynamics of the ELMs at both high and low field sides [4] such as asymmetries in intensity, mode number and rotation direction casted a doubt in peeling-ballooning mode. Response of high field side ELM to the RMP was more pronounced compared to that of the low field side. Other study includes observation of multi-modes and sudden mode number transition. During the ELM-crash suppression experiment, various types of ELM-crash patterns were observed and often the suppression was marginal. The observed semi-coherent turbulence spectra under the RMP provided an evidence of non-linear interaction between the ELMs and turbulence [5]. |
- |
dc.identifier.bibliographicCitation |
43rd European Physical Society Conference on Plasma Physics |
- |
dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/36841 |
- |
dc.language |
영어 |
- |
dc.publisher |
European Physical Society |
- |
dc.title |
Dynamics of the ELMs in pre-crash and crash suppressed period in KSTAR |
- |
dc.type |
Conference Paper |
- |
dc.date.conferenceDate |
2016-07-04 |
- |