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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)

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