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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone
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Overview of the KSTAR research progress and future plan toward ITER and K-DEMO

22 Oct 2018, 14:50
25m
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Overview OV - Overviews OV/2 Overview Magnetic Fusion

Speaker

Prof. HYEON KEO PARK (UNIST)

Description

The KSTAR research efforts have been focused on expansion of the KSTAR operating space for ITER and K-DEMO[1], validation of critical physics and search of new physics. The operating regimes are high bp (up to ~2.8) non-inductive long pulse up to ~8s, high bN up to ~ 4.3, and k of ~2.16 and a long H-mode discharge over a minute. An improved underlying physics of resonant and non-resonant magnetic perturbation (RMP and NRMP) with the IVCC coils resulted in a long pulse edge localized mode (ELM)-crash suppressed H-mode discharge (~34s).[2] The ELM-crash suppression dependence on critical physical parameters, such as q95, d, andn was extensively investigated. Identification of the role of turbulence induced by RMPs in suppression of the ELMs identified the turbulence flow (ω_(⊥e)) physics during the RMP ramp up and down periods.[3] The study of L/H transition threshold power (Pth) dependence on the non-axisymmetric field found that the Pth is significantly affected by RMPs while NRMP components had no influence on Pth.[4] New physics of interaction between the macroscopic fluctuation (2/1 island) and micro turbulences [5] and validation of q0 issue in sawtooth instability has been explored.[6] Also the misaligned RMP configurations are used to test the divertor heat flux dispersal. [6] A major upgrade plan in KSTAR will be initiated in ~2021 for stable higher beta long pulse operation. Emphasis will be placed on a new actively cooled tungsten divertor possibly with new first wall materials and current drive (LHCD/Helicon). For the search of metal wall materials in the KSTAR upgrade plan, test of specially designed castellated tungsten block tiles of various shapes,[7] impurity transport physics experiments via injection of trace Ar and Kr gases and tungsten dust were performed. *This work is supported by the KSTAR research project funded by Korea Ministry of Science, ICT and Future Planning. References: [1] Y.K. Oh et al., FED 84 344 (2009) [2] Y. In et al., NF 55, 043004 (2015) [3] J. Lee et al., PRL, 117 (7), 075001 (2016), J. Lee et al., ibid (2018) [4] W.H. Ko et al., APS bulletin (2017) [5] J.M. Kwon et al., ibid (2018), M.J. Choi et al., NF 57, 126058 (2017) [6] Y. In et al., ibid (2018) [7] S.H. Hong et al., ibid (2018)
Paper Number OV/2-3
Country or International Organization Korea, Republic of

Primary author

Prof. HYEON KEO PARK (UNIST)

Co-authors

Dr Alberto Loarte (ITER IO) Dr Choongseock Chang (PPPL) Dave Humphreys (GA) Dr Dennis Mueller (PPPL) Prof. Gunsu Yun (POSTECH) Dr Hyungho Park (NFRI) Dr Jaehyun Lee (NFRI) Dr Jayhyun Kim (NFRI) Dr Jinil Chung (NFRI) Dr Jinseok Ko (NFRI) Dr Jonggu KWAK (NFRI) Dr Jongkyu PARK (PPPL) Dr Jsemin Kwon (NFRI) Dr Junwook Ahn (ORNL) Dr K.C. Lee (NFRI) Dr Minjun CHOI (NFRI) Dr Richard Pitts (ITER IO) Dr Sanghee Hahn (NFRI) Dr Siwoo Yoon (NFRI) Dr Steve Sabbagh (Columbia) Dr Sukho HONG (NFRI) Dr Wonha Ko (NFRI) Dr Wonho Choe (KAIST) Dr Woochang Lee (NFRI) Dr Yong Chu (NFRI) Prof. Yonggyun In (UNIST) Dr Yongkuk Oh (NFRI) Dr Yongseok park (Columbia) Dr Youngmu JEON (NFRI) Dr sunjong Wang (NFRI) Dr yongun Nam (nfri)

Presentation Materials