Magnetic equilibrium design for the SMART tokamak

S.J. Doyle; D. Lopez-Aires; A. Mancini; M. Agredano-Torres; J.L. Garcia-Sanchez; J. Segado-Fernandez; J. Ayllon-Guerola; M. Garcia-Muñoz; E. Viezzer; C. Soria-Hoyo; J. Garcia-Lopez; G. Cunningham; P.F. Buxton; M.P. Gryaznevich; Y.S. Hwang; K.J. Chung

doi:10.1016/j.fusengdes.2021.112706

Magnetic equilibrium design for the SMART tokamak

S.J. Doyle^* (Corresponding Author)
, D. Lopez-Aires
, A. Mancini
, M. Agredano-Torres
, J.L. Garcia-Sanchez
, J. Segado-Fernandez
, J. Ayllon-Guerola
, M. Garcia-Muñoz
, E. Viezzer
, C. Soria-Hoyo
, J. Garcia-Lopez
, G. Cunningham
, P.F. Buxton
, M.P. Gryaznevich
, Y.S. Hwang
, K.J. Chung

^*Corresponding author for this work

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

23 Citations (Scopus)

2 Downloads (Pure)

Abstract

The SMall Aspect Ratio Tokamak (SMART) device is a new compact (plasma major radius m, minor radius m, aspect ratio ) spherical tokamak, currently in development at the University of Seville. The SMART device has been designed to achieve a magnetic field at the plasma center of up to T with plasma currents up to kA and a pulse length up to ms. A wide range of plasma shaping configurations are envisaged, including triangularities between and elongations of . Control of plasma shaping is achieved through four axially variable poloidal field coils (PF), and four fixed divertor (Div) coils, nominally allowing operation in lower-single null, upper-single null and double-null configurations. This work examines phase 2 of the SMART device, presenting a baseline reference equilibrium and two highly-shaped triangular equilibria. The relevant PF and Div coil current waveforms are also presented. Equilibria are obtained via an axisymmetric Grad-Shafranov force balance solver (Fiesta), in combination with a circuit equation rigid current displacement model (RZIp) to obtain time-resolved vessel and plasma currents.

Original language	English
Article number	112706
Number of pages	9
Journal	Fusion Engineering and Design
Volume	171
Early online date	27 Sept 2021
DOIs	https://doi.org/10.1016/j.fusengdes.2021.112706
Publication status	Published - Oct 2021
Externally published	Yes

Funding

The authors would like to thank the VEST team for their technical and engineering support. This work received funding from the Fondo Europeo de Desarollo Regional (FEDER) by the European Commission under grant agreement numbers IE17-5670 and US-15570. In addition support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 805162) is gratefully acknowledged.

Funders	Funder number
European Research Council	IE17-5670, 805162

Keywords

Spherical tokamak
Equilibrium
Null-field
Breakdown
SMART

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Doyle, S. J., Lopez-Aires, D., Mancini, A., Agredano-Torres, M., Garcia-Sanchez, J. L., Segado-Fernandez, J., Ayllon-Guerola, J., Garcia-Muñoz, M., Viezzer, E., Soria-Hoyo, C., Garcia-Lopez, J., Cunningham, G., Buxton, P. F., Gryaznevich, M. P., Hwang, Y. S., & Chung, K. J. (2021). Magnetic equilibrium design for the SMART tokamak. Fusion Engineering and Design, 171, Article 112706. https://doi.org/10.1016/j.fusengdes.2021.112706

Doyle, SJ, Lopez-Aires, D, Mancini, A, Agredano-Torres, M, Garcia-Sanchez, JL, Segado-Fernandez, J, Ayllon-Guerola, J, Garcia-Muñoz, M, Viezzer, E, Soria-Hoyo, C, Garcia-Lopez, J, Cunningham, G, Buxton, PF, Gryaznevich, MP, Hwang, YS & Chung, KJ 2021, 'Magnetic equilibrium design for the SMART tokamak', Fusion Engineering and Design, vol. 171, 112706. https://doi.org/10.1016/j.fusengdes.2021.112706

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abstract = "The SMall Aspect Ratio Tokamak (SMART) device is a new compact (plasma major radius m, minor radius m, aspect ratio ) spherical tokamak, currently in development at the University of Seville. The SMART device has been designed to achieve a magnetic field at the plasma center of up to T with plasma currents up to kA and a pulse length up to ms. A wide range of plasma shaping configurations are envisaged, including triangularities between and elongations of . Control of plasma shaping is achieved through four axially variable poloidal field coils (PF), and four fixed divertor (Div) coils, nominally allowing operation in lower-single null, upper-single null and double-null configurations. This work examines phase 2 of the SMART device, presenting a baseline reference equilibrium and two highly-shaped triangular equilibria. The relevant PF and Div coil current waveforms are also presented. Equilibria are obtained via an axisymmetric Grad-Shafranov force balance solver (Fiesta), in combination with a circuit equation rigid current displacement model (RZIp) to obtain time-resolved vessel and plasma currents.",

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AU - Segado-Fernandez, J.

AU - Ayllon-Guerola, J.

AU - Garcia-Muñoz, M.

AU - Viezzer, E.

AU - Soria-Hoyo, C.

AU - Garcia-Lopez, J.

AU - Cunningham, G.

AU - Buxton, P.F.

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AU - Chung, K.J.

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KW - Breakdown

KW - SMART

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DO - 10.1016/j.fusengdes.2021.112706

M3 - Article

VL - 171

JO - Fusion Engineering and Design

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M1 - 112706

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Magnetic equilibrium design for the SMART tokamak

Abstract

Funding

Keywords

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