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Journal Articles

A Possible breakthrough of power handling by plasma shaping in tokamak

Kikuchi, Mitsuru; Fasoli, A.*; Takizuka, Tomonori*; Diamond, P. H.*; Medvedev, S.*; Wu, Y.*; Duan, X.*; Kishimoto, Yasuaki*; Hanada, Kazuaki*; Pueschel, M. J.*; et al.

Proceedings of 8th IAEA Technical Meeting on Steady State Operation of Magnetic Fusion Devices (CD-ROM), 20 Pages, 2015/05

The standard D shaped H-mode operation showed excellent plasma confinement ut has important issues of transient and steady state heat flux. To solbe this issues, we proposed new scenario using plasma shaping as one of possible scenario of future tokamak reactor.

Journal Articles

Negative triangularity as a possible tokamak scenario

Kikuchi, Mitsuru; Takizuka, Tomonori*; Furukawa, Masaru*

JPS Conference Proceedings (Internet), 1, p.015014_1 - 015014_4, 2014/03

Recent scaling of SOL e-folding length by Goldston shows pessimistic prediction to ITER and DEMO. This seems caused by the SOL acceleration mechanism found by Takizuka. In the negative D shaped plasma, this SOL acceleration may be significantly reduced. Negative D also has TEM eigen mode structure tilted poloidally and confinement in L mode is two times of L-mode. Based on these facts, we discuss possibility of negative D as a possible operation candidate of tokamak.

Journal Articles

Assessment of olfactory nerve by SPECT-MRI image with nasal thallium-201 administration in patients with olfactory impairments in comparison to healthy volunteers

Shiga, Hideaki*; Taki, Junichi*; Washiyama, Koshin*; Yamamoto, Jumpei*; Kinase, Sakae; Okuda, Koichi*; Kinuya, Seigo*; Watanabe, Naoto*; Tonami, Hisao*; Koshida, Kichiro*; et al.

PLOS ONE (Internet), 8(2), p.e57671_1 - e57671_8, 2013/02

 Times Cited Count:18 Percentile:68.96(Multidisciplinary Sciences)

Oral presentation

Negative D shape plasma as possible operation scenario of tokamak reactor

Kikuchi, Mitsuru; Takizuka, Tomonori*; Furukawa, Masaru*

no journal, , 

APTWG is an international conference on plasma transport organized by Japan, China and Korea. 3rd APTWG will be held at Jeju and the chairman of the organizing committee (Prof. Diamond, director of WCI fusion theory center, NFRI) asked to give an plenary talk. The talk will address issues of heat flux scaling by R. Goldston and negative D shape plasma will be discussed as its counter measure.

Oral presentation

Possibility of negative triangular tokamak as a fusion plasma, 1; Characteristics of configuration

Kikuchi, Mitsuru; Takizuka, Tomonori*; Furukawa, Masaru*

no journal, , 

Assessment of negative triangular tokamak is reported. With negative delta, we can increase major radius of the divertor plate by 2.5 and also by $$sim$$3 using snowfrake leading to $$sim$$7 times lower heat flux.

Oral presentation

Progress of understanding negative triangular tokamak configuration

Kikuchi, Mitsuru; Fasoli, A.*; Takizuka, Tomonori*; Diamond, P.*; Medvedev, S.*; Duan, X.*; Zushi, Hideki*; Furukawa, Masaru*; Kishimoto, Yasuaki*; Wu, Y.*; et al.

no journal, , 

Power and particle control is challenging for standard D-shaped H-mode scenario in tokamak. Possibility of negative triangularity as innovative tokamak concept is discussed by Kikuchi et al. Experimental and numerical studies of negative triangular plasma at CRPP-EPFL success-fully demonstrated improved connement and the weakening of the SOL flow acceleration is implied for the negative triangularity. Recent studies on mechanism of type II and grassy ELM show importance of closure of second stability access to achieve small ELM regimes and also kinetic effects. Medvedev showed that closure of second stability also occurs for negative triangularity. But the MHD stability in negative triangularity is a bit more complicated so that closure of second stability does not imply easy access to small ELM regimes. We discuss critical elements behind.

Oral presentation

Transport reduction mechanism in negative triangularity tokamak

Kikuchi, Mitsuru; Takizuka, Tomonori*; Furukawa, Masaru*

no journal, , 

While negative triangular tokamak configuration has possibility to improve power handling capability, mechanism of improved confinement observed in TCV is still not fully understood. In this talk, we will summarize present understanding of linear eigenmode structure of toroidal drift waves and also flow shear suppression of turbulence.

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