The Small Aspect Ratio Tokamak SMART: status and plans

POSTER

Abstract

SMART is a spherical tokamak currently being assembled at the University of Seville (Spain) to explore the physics of negative triangularity plasmas at low aspect ratio [1]. SMART is designed for flexible shaping with triangularities -0.6≤δ≤0.6, aspect ratio 1.4≤A≤3.0, elongation κ<3 and major/minor radii of 0.45m and 0.25cm, operating at Bt ≤1T and Ip≤1MA. After an initial phase of ohmic plasmas, SMART will be heated by hydrogen Neutral Beam Injection with PNBI=1MW and maximum injection energy of 30keV [2]. Planned diagnostics (including magnetics, Thomson scattering, spectroscopy, interferometry, probes) will be discussed. Initial plasma scenarios have been developed with the FIESTA code for magnetic equilibrium and coil settings and the ASTRA code for evaluating the plasma performance [3]. ASTRA simulations are used as a starting point for further time-dependent predictions through the TRANSP code. NBI parameters have been optimized using the ASCOT and TRANSP codes [4]. Stability studies have been performed using the MARS-F code for linear simulations and the MEGA code for hybrid non-linear simulations. For the given SMART scenarios, it has been observed that NT provides a smaller stable operational window against edge current and pressure gradient driven modes compared to positive triangularity, but comparable to that found in conventional tokamaks.

References: [1] M. Garcia-Munoz, IAEA-FEC (2023); [2] A. Mancini, FED 171 10 (2021); [3] S. J. Doyle, PRX 3 12 (2021); [4] D. J. Cruz-Zabala, EPS (2023)

*Work supported by the US DOE Contract No. DE-AC02-09CH11466 and the DoE SULI program. 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. This work has been partly carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Presenters

  • Mario L Podesta

    • Princeton Plasma Physics Laboratory
    • PPPL

Authors

  • Mario L Podesta

    • Princeton Plasma Physics Laboratory
    • PPPL

  • Eleonora Viezzer

    • University of Seville, Spain
    • University of Sevilla
    • University of Seville, Seville, Spain

  • Manuel Garcia-Munoz

    • University of Seville, Spain
    • University of Seville
    • University of Sevilla
    • University of Seville, Seville, Spain

  • Juan M Ayllon-Guerola

    • University of Seville, Spain

  • Jack Berkery

    • Princeton Plasma Physics Laboratory

  • Diego J Cruz-Zabala

    • University of Seville, Spain
    • University of Sevilla
    • University of Seville, Seville, Spain

  • Luis F Delgado-Aparicio

    • Princeton Plasma Physics Laboratory

  • Ahmed Diallo

    • Princeton Plasma Physics Laboratory

  • Jesus Dominguez-Palacios

    • University of Seville, Spain
    • University of Sevilla

  • Fernando Fuentes del Pozo

    • University of Seville, Spain

  • Joaquin Galdon-Quiroga

    • University of Seville, Spain

  • Manjit Kaur

    • Princeton Plasma Physics Laboratory

  • John A Labbate

    • University of Maryland, College Park

  • Alessio Mancini

    • University of Seville, Spain
    • University of Sevilla
    • University of Seville, Seville, Spain

  • Kiera A McKay

    • University of Seville, Spain

  • Stefano Munaretto

    • Princeton Plasma Physics Laboratory (PPPL)
    • PPPL

  • Francesca M Poli

    • Princeton Plasma Physics Laboratory

  • Alfonso Rodriguez

    • University of Seville, Spain

  • Jesus Salas

    • University of Seville, Spain

  • J. Segado-Fernandez

    • University of Seville, Spain
    • University of Seville, Seville, Spain

  • Mykyta Varavin

    • IPP-CAS Prague, CZ

  • Lina Velarde-Gallardo

    • University of Seville, Spain

  • Pablo Vicente Torres

    • University of Seville, Spain

  • James J Yang

    • Princeton Plasma Physics Laboratory