FTU in the context of the fusion research

FTU is a compact, high-magnetic-field tokamak constructed along the line of the ALCATOR experiments at MIT and of the FT (Frascati Tokamak) experiment in Frascati. The compact, high magnetic field devices are characterized by a large current density value

with B being the toroidal magnetic field intensity and R the major radius.

B(T) I(MA) R(m) Paux(MW)
FTU 8 1.6 0.93 4.6
JET 3.5 6 3.0 20
Tore Supra 4 1.3 2.4 10
ASDEX-U 2.5 1.0 1.5 10

with Paux being the auxiliary heating power. Thus, the combination of large B values and small dimension allows the achievement of large j values. This, in turn, has several advantages:

FTU has begun operation with plasma in 1990, and is still producing good physics results. It has achieved its design parameters: 1.6 MA at 8 T, and plasma density larger than 3e20 m-3. FTU is provided with three additional heating systems (LH, ECRH and IBW), two pellect injection systems, one shooting along the major radius and one shooting along a vertical chord in the high field region and of course a complete set of plasma diagnostics.

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