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This content will become publicly available on March 26, 2019

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

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'.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [4] ;  [4] ; ORCiD logo [3] ;  [5] ;  [6]
  1. Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of)
  2. National Fusion Research Inst. (NFRI), Daejeon (Korea, Republic of); Univ. of Science and Technology, Daejeon (Korea, Republic of)
  3. Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  4. National Fusion Research Inst. (NFRI), Daejeon (Korea, Republic of)
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  6. Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of); National Fusion Research Inst. (NFRI), Daejeon (Korea, Republic of)
Publication Date:
Grant/Contract Number:
AC02-09CH11466; NRF- 2014 M1A 7A1A03029865
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 6; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
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 Org:
USDOE; National Research Foundation of Korea (NRF); Ministry of Science, ICT and Future Planning (MSIP) of Korea
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1437609