Validation of the 'full reconnection model' of the sawtooth instability in KSTAR

Nam, Y. B.; Ko, J. S.; Choe, G. H.; Bae, Y.; Choi, M. J.; Lee, W.; Yun, G. S.; Jardin, S.; Park, H. K.

doi:10.1088/1741-4326/aab972

Title: Validation of the 'full reconnection model' of the sawtooth instability in KSTAR

Journal Article · Mon Mar 26 00:00:00 EDT 2018 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aab972· OSTI ID:1437609

Nam, Y. B. ^[1]; Ko, J. S. ^[2]; Choe, G. H. ^[3]; Bae, Y. ^[4];

^[4]; Lee, W. ^[4];

^[3]; Jardin, S. ^[5]; Park, H. K. ^[6]

Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of)
National Fusion Research Inst. (NFRI), Daejeon (Korea, Republic of); Univ. of Science and Technology, Daejeon (Korea, Republic of)
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
National Fusion Research Inst. (NFRI), Daejeon (Korea, Republic of)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of); National Fusion Research Inst. (NFRI), Daejeon (Korea, Republic of)

In this paper, the central safety factor (q ₀) during sawtooth oscillation has been measured with a great accuracy with the motional Stark effect (MSE) system on KSTAR and the measured value was However, this measurement alone cannot validate the disputed full and partial reconnection models definitively due to non-trivial off-set error (~0.05). Supplemental experiment of the excited m = 2, m = 3 modes that are extremely sensitive to the background q ₀ and core magnetic shear definitively validates the 'full reconnection model'. The radial position of the excited modes right after the crash and time evolution into the 1/1 kink mode before the crash in a sawtoothing plasma suggests that in the MHD quiescent period after the crash and before the crash. Finally, additional measurement of the long lived m = 3, m = 5 modes in a non-sawtoothing discharge (presumably ) further validates the 'full reconnection model'.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of); National Fusion Research Inst. (NFRI), Daejeon (Korea, Republic of)

Sponsoring Organization:: USDOE; National Research Foundation of Korea (NRF); Ministry of Science, ICT and Future Planning (MSIP) of Korea

Grant/Contract Number:: AC02-09CH11466; NRF- 2014 M1A 7A1A03029865

OSTI ID:: 1437609

Journal Information:: Nuclear Fusion, Vol. 58, Issue 6; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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