TJ-II:Coil system: Difference between revisions

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{| class="wikitable"  align="center" border="1"
{| class="wikitable"  align="center" border="1"
!''Coil'' !! ''Number'' !!''Size (m)''!! ''Turns''
!''Coil'' !! ''Number'' !!''Size (m)''!! ''Position (m) '' !! ''Turns''
|-
|-
|Circular (CC) || 1 || ''R'' = 1.5 || 24
|Circular (CC) || 1 || ''R'' = 1.5 || ''Z'' = 0 || 24
|-
|-
|Helical (HX)<ref>J. Alonso and M. Blaumoser, ''Design and feasibility of the TJ-II hard core'', [[doi:10.1109/FUSION.1991.218810|Fusion Engineering,  14th IEEE/NPSS Symposium (1991)]]</ref> || 1 || ''R'' = 1.5 <br> swing = 0.07 || 24
|Helical (HX)<ref>J. Alonso and M. Blaumoser, ''Design and feasibility of the TJ-II hard core'', [[doi:10.1109/FUSION.1991.218810|Fusion Engineering,  14th IEEE/NPSS Symposium (1991)]]</ref> || 1 || ''R'' = 1.5 <br> swing = 0.07 || || 24
|-
|-
|Toroidal (TF) || 28 || ''r'' = 0.425 || 8
|Toroidal (TF) || 28 || ''r'' = 0.425 || ''R'' = 1.5 + 0.2825 cos(4&phi;) </br> ''Z'' = -0.2825 sin(4&phi;) || 8
|-
|-
|Toroidal (TF) || 4 || ''r'' = 0.475 || 9
|Toroidal (TF) || 4 || ''r'' = 0.475 || ''R'' = 1.5 + 0.3225 cos(4&phi;) </br> ''Z'' = -0.3225 sin(4&phi;) </br> &phi; = 0, 90, 180, 270&deg;|| 9
|-
|-
|Vertical (VF) || 2 || ''R'' = 2.25 || 16
|Vertical (VF) || 2 || ''R'' = 2.25 || ''Z'' = &pm; 0.75 || 16
|-
|-
|Compensation (OH) || 2 || ''R'' = 0.78 || 20
|Compensation (OH) || 2 || ''R'' = 0.78 || ''Z'' = &pm; 0.75 || 20
|-
|-
|Compensation (OH) || 2 || ''R'' = 2.29 || 1
|Compensation (OH) || 2 || ''R'' = 2.29 || ''Z'' = &pm; 0.75 || 1
|-
|-
|Radial (R) || 2 || ''R'' = 0.74 || 7
|Radial (R) || 2 || ''R'' = 0.74 || ''Z'' = &pm; 0.75 || 7
|-
|-
|Radial (R) || 2 || ''R'' = 2.24 || 5
|Radial (R) || 2 || ''R'' = 2.24 || ''Z'' = &pm; 0.75 || 5
|}
|}


Revision as of 10:58, 26 April 2024

The core coil pack consists of three coils: the circular core (CC), the helix 1 (HX1), and the helix 2 (HX2).

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.[1]

Coil Number Size (m) Position (m) Turns
Circular (CC) 1 R = 1.5 Z = 0 24
Helical (HX)[2] 1 R = 1.5
swing = 0.07		 24
Toroidal (TF) 28 r = 0.425 R = 1.5 + 0.2825 cos(4φ)
Z = -0.2825 sin(4φ)		 8
Toroidal (TF) 4 r = 0.475 R = 1.5 + 0.3225 cos(4φ)
Z = -0.3225 sin(4φ)
φ = 0, 90, 180, 270°		 9
Vertical (VF) 2 R = 2.25 Z = ± 0.75 16
Compensation (OH) 2 R = 0.78 Z = ± 0.75 20
Compensation (OH) 2 R = 2.29 Z = ± 0.75 1
Radial (R) 2 R = 0.74 Z = ± 0.75 7
Radial (R) 2 R = 2.24 Z = ± 0.75 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.

TJ-II Coils. Red: central. Yellow: helical. Blue: toroidal. Green: vertical. Brown and green: radial.

See also

References

  1. ↑ 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)
  2. ↑ J. Alonso and M. Blaumoser, Design and feasibility of the TJ-II hard core, Fusion Engineering, 14th IEEE/NPSS Symposium (1991)
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