Formation and collapse of an internal transport barrier

A. Fukuyama; K. Itoh; S. I. Itoh; M. Yagi

doi:10.1088/0029-5515/40/3Y/332

Formation and collapse of an internal transport barrier

A. Fukuyama, K. Itoh, S. I. Itoh, M. Yagi

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A theoretical model of an internal transport barrier (ITB) is developed. The transport model based on the self-sustained turbulence theory of the current diffusive ballooning mode is extended to include the effects of E×B rotation shear. Delayed formation of the ITB is observed in transport simulations. The influence of finite gyroradius is also discussed. Simulation of the current ramp-up experiment successfully described the radial profile of density, temperature and safety factor. A model of ITB collapse due to magnetic braiding is proposed. Sudden enhancement of transport triggered by overlapping of magnetic islands terminates the ITB. The possibility of destabilizing global low n modes is also discussed.

Original language	English
Pages (from-to)	685-692
Number of pages	8
Journal	Nuclear Fusion
Volume	40
Issue number	SPEC. ISS. 3
DOIs	https://doi.org/10.1088/0029-5515/40/3Y/332
Publication status	Published - Jan 1 2000

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/40/3Y/332

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abstract = "A theoretical model of an internal transport barrier (ITB) is developed. The transport model based on the self-sustained turbulence theory of the current diffusive ballooning mode is extended to include the effects of E×B rotation shear. Delayed formation of the ITB is observed in transport simulations. The influence of finite gyroradius is also discussed. Simulation of the current ramp-up experiment successfully described the radial profile of density, temperature and safety factor. A model of ITB collapse due to magnetic braiding is proposed. Sudden enhancement of transport triggered by overlapping of magnetic islands terminates the ITB. The possibility of destabilizing global low n modes is also discussed.",

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AU - Fukuyama, A.

AU - Itoh, K.

AU - Itoh, S. I.

AU - Yagi, M.

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Y1 - 2000/1/1

N2 - A theoretical model of an internal transport barrier (ITB) is developed. The transport model based on the self-sustained turbulence theory of the current diffusive ballooning mode is extended to include the effects of E×B rotation shear. Delayed formation of the ITB is observed in transport simulations. The influence of finite gyroradius is also discussed. Simulation of the current ramp-up experiment successfully described the radial profile of density, temperature and safety factor. A model of ITB collapse due to magnetic braiding is proposed. Sudden enhancement of transport triggered by overlapping of magnetic islands terminates the ITB. The possibility of destabilizing global low n modes is also discussed.

AB - A theoretical model of an internal transport barrier (ITB) is developed. The transport model based on the self-sustained turbulence theory of the current diffusive ballooning mode is extended to include the effects of E×B rotation shear. Delayed formation of the ITB is observed in transport simulations. The influence of finite gyroradius is also discussed. Simulation of the current ramp-up experiment successfully described the radial profile of density, temperature and safety factor. A model of ITB collapse due to magnetic braiding is proposed. Sudden enhancement of transport triggered by overlapping of magnetic islands terminates the ITB. The possibility of destabilizing global low n modes is also discussed.

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JO - Nuclear Fusion

JF - Nuclear Fusion

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ER -

Formation and collapse of an internal transport barrier

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