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20th International Spherical Torus Workshop (ISTW2019)

28–31 Oct 2019
Frascati
Europe/Rome timezone

Organizers

Session

Session O1

O1
28 Oct 2019, 09:15
23/3-02 - FSN Meeting room (Frascati)

23/3-02 - FSN Meeting room

Frascati

Via Enrico Fermi, 45 Frascati
12

Presentation materials

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  1. 34. Final results of the Phase-1 of the PROTO-SPHERA experiment and first evidences of plasma tori production and sustainment
    Dr Paolo Micozzi (ENEA C.R. Frascati)
    28/10/2019, 09:15
    oral

    The PROTO-SPHERA experiment is an unconventional magnetic confinement scheme,
    which aims at producing a Spherical Torus (with Ie≤300 kA) around a Plasma Centerpost (with Ie=70 kA) fed by electrodes of annular shape, in contrast with the metal centerpost of conventional Tokamaks. The Phase-1 of PROTO-SPHERA, aimed of obtaining a stable Hydrogen Plasma Centerpost, lasting 1 sec at Ie=8.5 kA...

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  2. 36. Present and future plans of PROTO-SPHERA
    Dr Franco Alladio (Centro Ricerche ENEA, Frascati C.P. 65, Rome, Italy)
    28/10/2019, 09:50
    ISTW2019
    oral

    PROTO-SPHERA is an axi-symmetric magnetic confinement experiment, just like a spherical Tokamak: toroidal and poloidal magnetic fields (i.e. a plasma toroidal current IST) are required inside a spherical torus to contain the plasma. PROTO-SPHERA produces both fields while removing the two central metal conductors: the central toroidal rod and the central ohmic transformer; they are replaced by...

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  3. 52. Technical Benefits of the PROTO-SPHERA Confinement Configuration
    Alessandro Lampasi (ENEA)
    28/10/2019, 10:10
    oral

    The PROTO-SPHERA experiment can produce plasma spherical tori with a simply connected configuration (the centerpost is practically implemented by the plasma itself) and a high confinement efficiency (β→1). Such configurations are obtained from the self-organization of a plasma arc (screw pinch) in a magnetostatic field. This approach leads to several technical and economic advantages, that...

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  4. 38. Analytical studies of PROTO-SPHERA equilibria
    Dr Paolo Buratti (ENEA)
    28/10/2019, 10:30
    oral

    Plasma tori formed around a 10 kA centerpost screw-pinch plasma discharge have been observed in phase-1 of PROTO-SPHERA experiments.
    A simple model of plasma equilibrium has been developed, which reproduces the morphological features observed so far, in particular the bumpy shape of the centerpost discharge and the slim torus surrounding it.
    The model is based on a generalization of the...

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  5. 37. MAST-U experimental programme: From first plasma to first campaign
    Dr Andrew Thornton (UKAEA)
    28/10/2019, 11:15
    oral

    The first stage in the experimental programme of MAST-U is planned for late 2019. A modelling framework, using time-dependent vacuum field calculations, has identified viable direct induction scenarios on MAST-U that achieve suitable null quality for rapid breakdown combined with the requirements for plasma equilibrium and passive vertical stability during the early plasma current ramp up [1]....

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  6. 32. MAST Upgrade - features and status
    Dr Brian Lloyd (UKAEA)
    28/10/2019, 11:50
    oral

    Presentation on the features and status of MAST Upgrade

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  7. 30. First operation of the Lithium Tokamak Experiment - β
    R. Majeski (Princeton Plasma Physics Lab)
    28/10/2019, 12:10
    oral

    LTX-β, the upgrade to the Lithium Tokamak Experiment, has now been operated with full lithium coatings on all plasma-facing surfaces, and at increased toroidal fields >0.3 T. Plasma current has so far been limited to <100 kA. The upgrade includes a neutral beam injector provided by Tri-Alpha Energy Technologies. The beam is designed to operate at 20 kV, with 35A of ion current. So far >600 kW...

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