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DC Field | Value | Language |
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dc.citation.number | 8 | - |
dc.citation.startPage | 083029 | - |
dc.citation.title | NUCLEAR FUSION | - |
dc.citation.volume | 53 | - |
dc.contributor.author | Park, Y. S. | - |
dc.contributor.author | Sabbagh, S. A. | - |
dc.contributor.author | Bialek, J. M. | - |
dc.contributor.author | Berkery, J. W. | - |
dc.contributor.author | Lee, S. G. | - |
dc.contributor.author | Ko, W. H. | - |
dc.contributor.author | Bak, J. G. | - |
dc.contributor.author | Jeon, Y. M. | - |
dc.contributor.author | Park, J. K. | - |
dc.contributor.author | Kim, J. | - |
dc.contributor.author | Hahn, S. H. | - |
dc.contributor.author | Ahn, J. -W. | - |
dc.contributor.author | Yoon, S. W. | - |
dc.contributor.author | Lee, K. D. | - |
dc.contributor.author | Choi, M. J. | - |
dc.contributor.author | Yun, G. S. | - |
dc.contributor.author | Park, Hyeon Keo | - |
dc.contributor.author | You, K. -I. | - |
dc.contributor.author | Bae, Y. S. | - |
dc.contributor.author | Oh, Y. K. | - |
dc.contributor.author | Kim, W. -C. | - |
dc.contributor.author | Kwak, J. G. | - |
dc.date.accessioned | 2023-12-22T03:39:18Z | - |
dc.date.available | 2023-12-22T03:39:18Z | - |
dc.date.created | 2015-09-02 | - |
dc.date.issued | 2013-08 | - |
dc.description.abstract | Initial H-mode operation of the Korea Superconducting Tokamak Advanced Research (KSTAR) is expanded to higher normalized beta and lower plasma internal inductance moving towards design target operation. As a key supporting device for ITER, an important goal for KSTAR is to produce physics understanding of MHD instabilities at long pulse with steady-state profiles, at high normalized beta, and over a wide range of plasma rotation profiles. An advance from initial plasma operation is a significant increase in plasma stored energy and normalized beta, with W-tot = 340 kJ, beta(N) = 1.9, which is 75% of the level required to reach the computed ideal n = 1 no-wall stability limit. The internal inductance was lowered to 0.9 at sustained H-mode duration up to 5 s. In ohmically heated plasmas, the plasma current reached 1 MA with prolonged pulse length up to 12 s. Rotating MHD modes are observed in the device with perturbations having tearing rather than ideal parity. Modes with m/n = 3/2 are triggered during the H-mode phase but are relatively weak and do not substantially reduce W-tot. In contrast, 2/1 modes to date only appear when the plasma rotation profiles are lowered after H-L back-transition. Subsequent 2/1 mode locking creates a repetitive collapse of beta(N) by more than 50%. Onset behaviour suggests the 3/2 mode is close to being neoclassically unstable. A correlation between the 2/1 mode amplitude and local rotation shear from an x-ray imaging crystal spectrometer suggests that the rotation shear at the mode rational surface is stabilizing. As a method to access the ITER-relevant low plasma rotation regime, plasma rotation alteration by n = 1, 2 applied fields and associated neoclassical toroidal viscosity (NTV) induced torque is presently investigated. The net rotation profile change measured by a charge exchange recombination diagnostic with proper compensation of plasma boundary movement shows initial evidence of non-resonant rotation damping by the n = 1, 2 applied field configurations. The result addresses perspective on access to low rotation regimes for MHD instability studies applicable to ITER. Computation of active RWM control using the VALEN-3D code examines control performance using midplane locked mode detection sensors. The LM sensors are found to be strongly affected by mode and control coil-induced vessel current, and consequently lead to limited control performance theoretically | - |
dc.identifier.bibliographicCitation | NUCLEAR FUSION, v.53, no.8, pp.083029 | - |
dc.identifier.doi | 10.1088/0029-5515/53/8/083029 | - |
dc.identifier.issn | 0029-5515 | - |
dc.identifier.scopusid | 2-s2.0-84881447523 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/16569 | - |
dc.identifier.url | http://iopscience.iop.org/0029-5515/53/8/083029/article | - |
dc.identifier.wosid | 000322794000031 | - |
dc.language | 영어 | - |
dc.publisher | INT ATOMIC ENERGY AGENCY | - |
dc.title | Investigation of MHD instabilities and control in KSTAR preparing for high beta operation | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | TOROIDAL-MOMENTUM DISSIPATION | - |
dc.subject.keywordPlus | DIII-D | - |
dc.subject.keywordPlus | TOKAMAK | - |
dc.subject.keywordPlus | PLASMAS | - |
dc.subject.keywordPlus | NSTX | - |
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