Single and double null equilibria in the SMART Tokamak

S J Doyle; A Mancini; M Agredano-Torres; J L Garcia-Sanchez; J Segado-Fernandez; J Ayllon-Guerola; M Garcia-Munoz; E Viezzer; J Garcia-Lopez; Y S Hwang; K J Chung

doi:10.1088/2516-1067/ac2a0e

Single and double null equilibria in the SMART Tokamak

S J Doyle
, A Mancini
, M Agredano-Torres
, J L Garcia-Sanchez
, J Segado-Fernandez
, J Ayllon-Guerola
, M Garcia-Munoz
, E Viezzer
, J Garcia-Lopez
, Y S Hwang
, K J Chung

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

6 Citations (Scopus)

Abstract

The SMall Aspect Ratio Tokamak (SMART) device is a novel, compact (Rgeo = 0.42 m, a = 0.22 m, A ≥ 1.70) spherical tokamak, currently under development at the University of Seville. The SMART device is being developed over 3 phases, with target on-axis toroidal magnetic fields between 0.1 ≤ Bϕ ≤ 1.0 T, and target plasma currents of between 35 ≤ Ip ≤ 400 kA; with phases 2 and 3 enabling access to a wide range of elongations (κ ≤ 2.30) and triangularities ( − 0.50 ≤ δ ≤ 0.50). SMART employs four internal divertor coils with two internal and two external poloidal field coils, enabling operation in lower-single, upper-single and double-null configurations. This work examines phase 3 of the SMART device, presenting a prospective L-mode discharge scenario without external heating, before examining five highly-shaped equilibria, including: two double null triangular configurations, two single null triangular configurations and a baseline double null configuration. All 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	044001
Number of pages	11
Journal	Plasma Research Express
Volume	3
Issue number	4
Early online date	18 Oct 2021
DOIs	https://doi.org/10.1088/2516-1067/ac2a0e
Publication status	Published - 1 Dec 2021
Externally published	Yes

Data Availability Statement

As the data pertains to the design of a new device it is currently stored internally within our group, but may be distributed to outside groups on reasonable request.

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. 805 162) is gratefully acknowledged.

Funders	Funder number
European Research Council	805162

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10.1088/2516-1067/ac2a0e

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title = "Single and double null equilibria in the SMART Tokamak",

abstract = "The SMall Aspect Ratio Tokamak (SMART) device is a novel, compact (Rgeo = 0.42 m, a = 0.22 m, A ≥ 1.70) spherical tokamak, currently under development at the University of Seville. The SMART device is being developed over 3 phases, with target on-axis toroidal magnetic fields between 0.1 ≤ Bϕ ≤ 1.0 T, and target plasma currents of between 35 ≤ Ip ≤ 400 kA; with phases 2 and 3 enabling access to a wide range of elongations (κ ≤ 2.30) and triangularities ( − 0.50 ≤ δ ≤ 0.50). SMART employs four internal divertor coils with two internal and two external poloidal field coils, enabling operation in lower-single, upper-single and double-null configurations. This work examines phase 3 of the SMART device, presenting a prospective L-mode discharge scenario without external heating, before examining five highly-shaped equilibria, including: two double null triangular configurations, two single null triangular configurations and a baseline double null configuration. All 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 - Doyle, S J

AU - Mancini, A

AU - Agredano-Torres, M

AU - Garcia-Sanchez, J L

AU - Segado-Fernandez, J

AU - Ayllon-Guerola, J

AU - Garcia-Munoz, M

AU - Viezzer, E

AU - Garcia-Lopez, J

AU - Hwang, Y S

AU - Chung, K J

PY - 2021/12/1

Y1 - 2021/12/1

N2 - The SMall Aspect Ratio Tokamak (SMART) device is a novel, compact (Rgeo = 0.42 m, a = 0.22 m, A ≥ 1.70) spherical tokamak, currently under development at the University of Seville. The SMART device is being developed over 3 phases, with target on-axis toroidal magnetic fields between 0.1 ≤ Bϕ ≤ 1.0 T, and target plasma currents of between 35 ≤ Ip ≤ 400 kA; with phases 2 and 3 enabling access to a wide range of elongations (κ ≤ 2.30) and triangularities ( − 0.50 ≤ δ ≤ 0.50). SMART employs four internal divertor coils with two internal and two external poloidal field coils, enabling operation in lower-single, upper-single and double-null configurations. This work examines phase 3 of the SMART device, presenting a prospective L-mode discharge scenario without external heating, before examining five highly-shaped equilibria, including: two double null triangular configurations, two single null triangular configurations and a baseline double null configuration. All 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.

AB - The SMall Aspect Ratio Tokamak (SMART) device is a novel, compact (Rgeo = 0.42 m, a = 0.22 m, A ≥ 1.70) spherical tokamak, currently under development at the University of Seville. The SMART device is being developed over 3 phases, with target on-axis toroidal magnetic fields between 0.1 ≤ Bϕ ≤ 1.0 T, and target plasma currents of between 35 ≤ Ip ≤ 400 kA; with phases 2 and 3 enabling access to a wide range of elongations (κ ≤ 2.30) and triangularities ( − 0.50 ≤ δ ≤ 0.50). SMART employs four internal divertor coils with two internal and two external poloidal field coils, enabling operation in lower-single, upper-single and double-null configurations. This work examines phase 3 of the SMART device, presenting a prospective L-mode discharge scenario without external heating, before examining five highly-shaped equilibria, including: two double null triangular configurations, two single null triangular configurations and a baseline double null configuration. All 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.

U2 - 10.1088/2516-1067/ac2a0e

DO - 10.1088/2516-1067/ac2a0e

M3 - Article

VL - 3

JO - Plasma Research Express

JF - Plasma Research Express

IS - 4

M1 - 044001

ER -

Single and double null equilibria in the SMART Tokamak

Abstract

Data Availability Statement

Funding

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