An attempt is carried out to form an
l=3 straight helical configuration of magnetic field using a shaped ferromagnetic material in a uniform magnetic field. The realized field has a feature expected for the
l=3 field, and the rotational-transform angle and shear length agree with predicted values within a factor of three. This
l=3 helical magnetic field is used to stabilize drift-wave instability in a collisionless plasma.
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