The last of the superconducting Wendelstein 7-X coils has
successfully passed the cryogenic tests at CEA Saclay near
Paris. The 50 non-planar and 20 planar coils of W7-X are
the heart of the device and technically the most demanding
components. The non-planar coils produce the helically-twisted magnetic field, responsible for the confinement of
the plasma. For experimental flexibility, the radial plasma
position and the helical twist of the magnetic field lines can
be modified by the planar coils.