Validation of the ‘full reconnection model’ of the sawtooth instability in KSTAR
SCOPUS
- Title
- Validation of the ‘full reconnection model’ of the sawtooth instability in KSTAR
- Authors
- Nam, Y. B.; Ko, J. S.; CHOE, GYUENG HYUEN; Bae, Y.; Choi, M. J.; Lee, W.; Yun, G. S.; Jardin, S.; Park, H. K.
- Date Issued
- 2018-04
- Publisher
- INT ATOMIC ENERGY AGENCY
- Abstract
- The central safety factor (q0) during sawtooth oscillation has been measured with a great
accuracy with the motional Stark effect (MSE) system on KSTAR and the measured value
was ∼1.0±0.03.However, this measurement alone cannot validate the disputed full and
partial reconnection models definitively due to nontrivial offset error (~0.05). Supplemental
experiment of the excited m = 2, m = 3 modes that are extremely sensitive to the background
q0 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 q0 >= 1.0 in the MHD quiescent period
after the crash and q0 < 1.0 before the crash. Additional measurement of the long lived m = 3,
m = 5 modes in a nonsawtoothing discharge (presumably q0>= 1.0) further validates the ‘full
reconnection model’.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/51049
- DOI
- 10.1088/1741-4326/aab972
- ISSN
- 0029-5515
- Article Type
- Article
- Citation
- NUCLEAR FUSION, vol. 58, no. 6, page. 066009, 2018-04
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- There are no files associated with this item.
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