Edge profile measurements using Thomson scattering on the KSTAR tokamak

Lee, J. H.; Oh, Seungtae; Lee, W. R.; Ko, W. H.; Kim, K. P.; Lee, K. D.; Jeon, Y.M.; Yoon, S.W.; Cho, K. W.; Narihara, K.; Yamada, I.; Yasuhara, Ryo; Hatae, T.; Yatsuka, E.; Ono, Taeko; Hong, Jin

doi:10.1063/1.4890258

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The kinetic pro les presented in Fig. 2c are obtained at the outboard side from Thomson Scattering systems (TS) 62 for the electron temperature and density and Charge Exchange Spectroscopy (CES) 63 for the impurity Carbon temperature and toroidal velocity. A Two-Colour Interferometer (TCI) with the CO 2 laser and Diodepumped-solid-state (DPSS) laser 64 and Electron Cyclotron Emission (ECE) measurements are used to determine the electron density and the temperature complementary to the TS measurements.…”

Section: Diagnosticsmentioning

confidence: 99%

A sustained high-temperature fusion plasma regime facilitated by fast ions

Han

Park

Sung

et al. 2022

Nature

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We report a discovery of a fusion plasma regime suitable for commercial fusion reactor where the ion temperature was sustained above 100 million degree about 20 s for the rst time. Nuclear fusion as a promising technology for replacing carbon-dependent energy sources has currently many issues to be resolved to enable its large-scale use as a sustainable energy source. State-of-the-art fusion reactors cannot yet achieve the high levels of fusion performance, high temperature, and absence of instabilities required for steady-state operation for a long period of time on the order of hundreds of seconds. This is a pressing challenge within the eld, as the development of methods that would enable such capabilities is essential for the successful construction of commercial fusion reactor. Here, a new plasma con nement regime called fast ion roled enhancement (FIRE) mode is presented. This mode is realized at Korea Superconducting Tokamak Advanced Research (KSTAR) and subsequently characterized to show that it meets most of the requirements for fusion reactor commercialization. Through a comparison to other well-known plasma con nement regimes, the favourable properties of FIRE mode are further elucidated and concluded that the novelty lies in the high fraction of fast ions, which acts to stabilize turbulence and achieve steady-state operation for up to 20 s by self-organization. We propose this mode as a promising path towards commercial fusion reactors.

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Section: Diagnosticsmentioning

confidence: 99%

A sustained high-temperature fusion plasma regime facilitated by fast ions

Han

Park

Sung

et al. 2022

Nature

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Diagnosticsmentioning

confidence: 99%

A new regime that “FIRE”s fusion plasmas for long sustained and high performance reactor conditions

Han

Park

et al. 2021

Preprint

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We report a discovery of a fusion plasma regime suitable for commercial fusion reactor where the ion temperature was sustained above 100 million degree about 20 s for the first time. Nuclear fusion as a promising technology for replacing carbon-dependent energy sources has currently many issues to be resolved to enable its large-scale use as a sustainable energy source. State-of-the-art fusion reactors cannot yet achieve the high levels of fusion performance, high temperature, and absence of instabilities required for steady-state operation for a long period of time on the order of hundreds of seconds. This is a pressing challenge within the field, as the development of methods that would enable such capabilities is essential for the successful construction of commercial fusion reactor. Here, a new plasma confinement regime called fast ion roled enhancement (FIRE) mode is presented. This mode is realized at Korea Superconducting Tokamak Advanced Research (KSTAR) and subsequently characterized to show that it meets most of the requirements for fusion reactor commercialization. Through a comparison to other well-known plasma confinement regimes, the favourable properties of FIRE mode are further elucidated and concluded that the novelty lies in the high fraction of fast ions, which acts to stabilize turbulence and achieve steady-state operation for up to 20 s by self-organization. We propose this mode as a promising path towards commercial fusion reactors.

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Characteristics of toroidal rotation and ion temperature pedestals between ELM bursts in KSTAR H-mode plasmas

Kwon

et al. 2016

Physics of Plasmas

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Steep pedestal profiles of ion temperature (Ti) and toroidal rotation (VФ) are routinely observed in neutral beam injection (NBI)-heated KSTAR H-mode plasmas [W. H. Ko et al Nucl. Fusion 55 083013 (2015)]. In this work, we report a result of detailed analysis of pedestal characteristics. By analyzing a set of data with different experimental conditions, we show that Ti and Vφ pedestals are coupled to each other and correlation between them becomes stronger when NBI-torque is lower. This suggests the existence of intrinsic toroidal torque in the pedestal. Based on a 1D transport analysis, we find that the prevalence of residual micro-turbulences is necessary to explain momentum transport in the pedestal. The estimated strength of intrinsic torque is shown to be comparable to that from a 2.7MW NBI source. Finally, we show that non-diffusive momentum flux is indispensable to explain momentum transport in the pedestal and a residual stress model fits the observed momentum flux reasonably. [1] W. H. Ko et al Nucl. Fusion 55 083013 (2015)

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Edge profile measurements using Thomson scattering on the KSTAR tokamak

Cited by 3 publications

References 5 publications

A sustained high-temperature fusion plasma regime facilitated by fast ions

A sustained high-temperature fusion plasma regime facilitated by fast ions

A new regime that “FIRE”s fusion plasmas for long sustained and high performance reactor conditions

Characteristics of toroidal rotation and ion temperature pedestals between ELM bursts in KSTAR H-mode plasmas

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