1983 年 49 巻 6 号 p. 567-587
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.