The TJ-II coil system is listed in the table below. All coils are directly cooled by water flowing trough longitudinal holes in the conductors. All coils have a reinforced structure to avoid mechanical deformations.
|Circular (CC)||1||R = 1.5||24|
|Helical (HX)||1|| R = 1.5
swing = 0.07
|Toroidal (TF)||28||r = 0.425||8|
|Toroidal (TF)||4||r = 0.475||9|
|Vertical (VF)||2||R = 2.25||16|
|Compensation (OH)||2||R = 0.78||20|
|Compensation (OH)||2||R = 2.29||1|
|Radial (R)||2||R = 0.74||7|
|Radial (R)||2||R = 2.24||5|
The main helical field is produced by the CC, HX, and TF coils. The vertical field coils (VF) allow positioning the magnetic axis. The ohmic coils (OH) can generate a loop voltage of 0.1 V, intended to cancel spurious toroidal currents. The radial coils (R) produce a trimming radial field of up to 100 G, intended to compensate stray fields.
- M. Medrano, M. Blaumoser, J. Alonso, G. Barrera, M. Pastor, C. Rubio, F. Pedrazo, and O. Heusmann, Strength considerations on the magnetic field coils of the Spanish Stellarator TJ-II, Fusion Engineering, 15th IEEE/NPSS Symposium (1993)
- J. Alonso and M. Blaumoser, Design and feasibility of the TJ-II hard core, Fusion Engineering, 14th IEEE/NPSS Symposium (1991)