The ETE Spherical Tokamak Experiment

ETE (Experimento Tokamak Esférico) is a device dedicated to the study of low aspect ratio tokamak plasmas. ETE was entirely designed and constructed at the Associated Plasma Laboratory of the National Space Research Institute. The main parameters of ETE are: major radius R = 0.30 m; aspect ratio A = R/a = 1.5 (a is the minor radius of the plasma torus); toroidal induction B = 0.4 T; and plasma current I = 0.2 MA. The plasma current in ETE can be extended up to ~ 0.4 MA, depending on the increase of the presently available power supplies and on a possible increase of the magnetic field up to the 0.6 T level. The aspect ratio can be reduced to 1.3 if the ohmic heating solenoid is removed, but this depends on future developments in the area of non- inductive current drive (without using the transformer action).

Artistic view of the ETE spherical tokamak experiment.

The low aspect ratio configuration requires careful design of the toroidal and poloidal field coils, vacuum vessel, mechanical structure and plasma facing components, that have to fit the limited central volume of the torus.

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Illustrations of various stages of assembly of the ETE spherical torus.

General objectives of the ETE experiment:

Short term research program:

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Picture of the ETE Spherical Tokamak Experiment.

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