TJ-IU
In the torsatron TJ-IU, a single coil generates the helicoidal magnetic field (l=1). The number of turns of the coil around the vacuum chamber is m=6. The vertical field is generated by a set of vertical field coils.
The device was entirely built in Spain and taken into operation in 1994.
Currently, TJ-IU is located at the University of Stuttgart in Germany under the name of TJ-K.