TJ-II:Magnetic configuration: Difference between revisions
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Created page with "The magnetic configurations of the low shear stellarator TJ-II in vacuum are specified by a label consisting of 3 numbers: X_Y_Z. These numbers represent the currents flowing in the external coils. * X is the current in the helical coil (HX, in kA) times 10 * Y is the current in the circular coil (CC, in kA) times 10 * Z is the current in the vertical field coil (VF, in kA) times 10 The current in the toroidal field coils (TF) is not specified,..." |
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Only some of the available range of configurations has been explored experimentally, as in the so-called well scan experiments<ref>A.M. de Aguilera, F. Castejón, E. Ascasíbar, E. Blanco, E. de la Cal, C. Hidalgo, B. Liu, A. López- | Only some of the available range of configurations has been explored experimentally, as in the so-called well scan experiments<ref>A.M. de Aguilera, F. Castejón, E. Ascasíbar, E. Blanco, E. de la Cal, C. Hidalgo, B. Liu, A. López- | ||
Fraguas, F. Medina, M.A. Ochando, I. Pastor, M.A. Pedrosa, B. van Milligen, and the TJ-II Team. ''Magnetic well scan and confinement in the TJ-II stellarator''. [[doi:10.1088/0029-5515/55/11/113014|Nucl. Fusion, 55(11):113014, 2015]].</ref>. | Fraguas, F. Medina, M.A. Ochando, I. Pastor, M.A. Pedrosa, B. van Milligen, and the TJ-II Team. ''Magnetic well scan and confinement in the TJ-II stellarator''. [[doi:10.1088/0029-5515/55/11/113014|Nucl. Fusion, 55(11):113014, 2015]].</ref>. | ||
Furthermore, the impact of the magnetic configuration on enhanced confinement has been studied<ref>Boudewijn Philip van Milligen, Teresa Estrada, Benjamin Carreras, Luis García, and TJ-II Team. ''Importance of the rotational transform for L–H transitions in the TJ-II stellarator''. [[doi:10.3390/plasma7020024|Plasma, 7(2):446–464, 2024]].</ref><ref>B.Ph. van Milligen, I. García-Cortés, K.J. McCarthy, B.A. Carreras, L. García, A. Cappa, P. Pons- | |||
Villalonga, T. Estrada, D. Medina-Roque, J. Hernández Sánchez, R. García, O.S. Kozachok, O.O. Chmyga, J.L. de Pablos, J.M. Barcala, A. Molinero, I. Pastor, D. Tafalla, A. de la Peña, F. Lapayese, and the TJ-II Team. ''The rotational transform and enhanced confinement in the TJ-II stellarator''. [[doi:10.1017/S0022377825100433|J. Plasma Phys., 91(4):E98, 2025]].</ref>. | |||
== See also == | == See also == | ||
Revision as of 07:52, 30 October 2026
The magnetic configurations of the low shear stellarator TJ-II in vacuum are specified by a label consisting of 3 numbers: X_Y_Z. These numbers represent the currents flowing in the external coils.
- X is the current in the helical coil (HX, in kA) times 10
- Y is the current in the circular coil (CC, in kA) times 10
- Z is the current in the vertical field coil (VF, in kA) times 10
The current in the toroidal field coils (TF) is not specified, as it is defined implicitly by requiring that the magnetic field equals 0.95 T at the magnetic axis in the relevant poloidal cross sections (where ECRH is injected) in order to ensure central power deposition.
A wide range of configurations is available. The following table lists a number of them.
| Configuration | rav(cm) | Bm,av (T) | Breson (T) | Rax(0°) (m) | Rax(45°) (m) | Shear (%) | Well (%) | ||
|---|---|---|---|---|---|---|---|---|---|
| 0_20_13 | 1.139 | 1.185 | 1.194 | 1.033 | 0.9504 | 1.644 | 1.374 | 0.7793 | 5.7521E-02 |
| 0_30_15 | 4.228 | 1.518 | 1.698 | 1.019 | 0.9500 | 1.658 | 1.360 | 11.85 | 1.050 |
| 0_40_18 | 5.903 | 1.756 | 2.003 | 1.008 | 0.9505 | 1.671 | 1.347 | 14.09 | 1.217 |
| 0_50_22 | 6.480 | 1.936 | 2.230 | 0.9973 | 0.9502 | 1.682 | 1.336 | 15.17 | 2.481 |
| 0_60_26 | 8.500 | 2.073 | 2.399 | 0.9885 | 0.9502 | 1.692 | 1.326 | 15.70 | 3.218 |
| 0_70_29 | 7.147 | 2.187 | 2.434 | 0.9805 | 0.9503 | 1.701 | 1.317 | 11.30 | 2.985 |
| 0_80_34 | 6.902 | 2.284 | 2.469 | 0.9736 | 0.9506 | 1.710 | 1.308 | 8.084 | 2.735 |
| 0_90_38 | 6.738 | 2.366 | 2.514 | 0.9663 | 0.9503 | 1.719 | 1.299 | 6.269 | 2.534 |
| 0_100_42 | 12.59 | 2.436 | 2.667 | 0.9601 | 0.9505 | 1.727 | 1.291 | 9.493 | 4.643 |
| 0_110_46 | 10.67 | 2.493 | 2.667 | 0.9539 | 0.9503 | 1.734 | 1.284 | 6.980 | 4.554 |
| 0_120_50 | 12.71 | 2.548 | 2.667 | 0.9482 | 0.9504 | 1.742 | 1.276 | 4.683 | 4.272 |
| 10_20_18 | 2.557 | 1.148 | 1.184 | 1.024 | 0.9514 | 1.652 | 1.366 | 3.183 | 0.2469 |
| 10_30_20 | 6.083 | 1.438 | 1.602 | 1.010 | 0.9501 | 1.666 | 1.352 | 11.35 | 1.398 |
| 10_40_24 | 6.921 | 1.659 | 1.880 | 1.000 | 0.9504 | 1.678 | 1.340 | 13.34 | 2.751 |
| 10_50_27 | 8.140 | 1.826 | 1.997 | 0.9909 | 0.9504 | 1.688 | 1.329 | 9.321 | 3.241 |
| 10_60_31 | 9.350 | 1.965 | 2.183 | 0.9826 | 0.9505 | 1.698 | 1.319 | 11.11 | 3.084 |
| 10_70_35 | 10.10 | 2.077 | 2.288 | 0.9750 | 0.9505 | 1.707 | 1.310 | 10.16 | 3.597 |
| 10_80_38 | 9.810 | 2.174 | 2.371 | 0.9674 | 0.9502 | 1.716 | 1.302 | 9.037 | 3.908 |
| 10_90_42 | 10.54 | 2.257 | 2.434 | 0.9610 | 0.9503 | 1.724 | 1.294 | 7.851 | 4.281 |
| 10_100_47 | 10.21 | 2.327 | 2.482 | 0.9546 | 0.9502 | 1.732 | 1.286 | 6.647 | 4.236 |
| 10_110_51 | 11.11 | 2.395 | 2.547 | 0.9488 | 0.9501 | 1.740 | 1.278 | 6.331 | 5.121 |
| 10_120_55 | 10.04 | 2.451 | 2.565 | 0.9432 | 0.9502 | 1.747 | 1.271 | 4.674 | 4.426 |
| 20_10_21 | 1.213 | 0.7902 | 0.7956 | 1.028 | 0.9503 | 1.645 | 1.373 | 0.6830 | 3.7624E-02 |
| 20_20_22 | 3.952 | 1.136 | 1.185 | 1.014 | 0.9500 | 1.661 | 1.357 | 4.350 | 0.4717 |
| 20_30_25 | 6.779 | 1.395 | 1.521 | 1.003 | 0.9502 | 1.673 | 1.344 | 9.049 | 1.550 |
| 20_40_28 | 8.475 | 1.592 | 1.771 | 0.9922 | 0.9498 | 1.685 | 1.333 | 11.25 | 2.879 |
| 20_50_32 | 8.039 | 1.756 | 1.906 | 0.9842 | 0.9505 | 1.695 | 1.323 | 8.571 | 3.131 |
| 20_60_35 | 11.21 | 1.884 | 1.997 | 0.9755 | 0.9498 | 1.705 | 1.313 | 5.968 | 1.980 |
| 20_70_39 | 11.08 | 1.994 | 2.154 | 0.9689 | 0.9504 | 1.714 | 1.304 | 7.982 | 3.385 |
| 20_80_43 | 12.14 | 2.092 | 2.255 | 0.9614 | 0.9497 | 1.722 | 1.296 | 7.811 | 4.133 |
| 20_90_47 | 12.83 | 2.174 | 2.324 | 0.9558 | 0.9503 | 1.730 | 1.288 | 6.862 | 4.713 |
| 20_100_51 | 12.68 | 2.246 | 2.379 | 0.9498 | 0.9503 | 1.738 | 1.280 | 5.945 | 4.930 |
| 20_110_55 | 13.79 | 2.313 | 2.434 | 0.9443 | 0.9505 | 1.745 | 1.273 | 5.248 | 5.117 |
| 20_120_59 | 13.91 | 2.368 | 2.483 | 0.9386 | 0.9502 | 1.752 | 1.265 | 4.822 | 5.418 |
| 30_10_25 | 2.709 | 0.8385 | 0.8507 | 1.018 | 0.9501 | 1.654 | 1.363 | 1.452 | 0.1431 |
| 30_20_27 | 5.443 | 1.134 | 1.189 | 1.007 | 0.9514 | 1.669 | 1.349 | 4.847 | 0.7001 |
| 30_30_30 | 8.180 | 1.368 | 1.481 | 0.9956 | 0.9506 | 1.681 | 1.337 | 8.332 | 1.733 |
| 30_40_33 | 9.756 | 1.550 | 1.687 | 0.9860 | 0.9503 | 1.692 | 1.326 | 8.877 | 2.798 |
| 30_50_37 | 11.16 | 1.702 | 1.878 | 0.9779 | 0.9503 | 1.702 | 1.316 | 10.37 | 4.941 |
| 30_60_40 | 9.262 | 1.827 | 1.936 | 0.9706 | 0.9505 | 1.711 | 1.307 | 5.952 | 3.624 |
| 30_70_44 | 12.28 | 1.937 | 2.007 | 0.9631 | 0.9502 | 1.720 | 1.298 | 3.593 | 4.431 |
| 30_80_48 | 13.28 | 2.033 | 2.149 | 0.9567 | 0.9502 | 1.728 | 1.290 | 5.702 | 3.674 |
| 30_90_52 | 14.16 | 2.115 | 2.231 | 0.9504 | 0.9501 | 1.736 | 1.282 | 5.476 | 4.227 |
| 30_100_56 | 14.97 | 2.187 | 2.295 | 0.9448 | 0.9502 | 1.743 | 1.275 | 4.949 | 4.755 |
| 30_110_59 | 15.76 | 2.246 | 2.356 | 0.9391 | 0.9500 | 1.751 | 1.267 | 4.920 | 5.215 |
| 30_120_63 | 14.48 | 2.306 | 2.389 | 0.9343 | 0.9504 | 1.758 | 1.260 | 3.573 | 5.025 |
| 40_00_27 | 1.350 | 0.5464 | 0.5471 | 1.024 | 0.9504 | 1.647 | 1.371 | 0.1331 | 2.4768E-02 |
| 40_10_29 | 4.111 | 0.8821 | 0.9010 | 1.010 | 0.9510 | 1.663 | 1.355 | 2.152 | 0.2456 |
| 40_20_31 | 6.646 | 1.146 | 1.202 | 0.9975 | 0.9501 | 1.677 | 1.341 | 4.928 | 0.8185 |
| 40_30_34 | 9.328 | 1.354 | 1.452 | 0.9884 | 0.9506 | 1.688 | 1.330 | 7.247 | 1.826 |
| 40_40_37 | 11.15 | 1.523 | 1.646 | 0.9788 | 0.9498 | 1.699 | 1.319 | 8.061 | 2.901 |
| 40_50_41 | 12.66 | 1.666 | 1.797 | 0.9719 | 0.9506 | 1.708 | 1.310 | 7.872 | 4.310 |
| 40_60_44 | 12.34 | 1.786 | 1.927 | 0.9637 | 0.9497 | 1.717 | 1.301 | 7.879 | 5.834 |
| 40_70_48 | 9.734 | 1.894 | 1.963 | 0.9579 | 0.9504 | 1.726 | 1.292 | 3.625 | 3.668 |
| 40_80_52 | 13.96 | 1.986 | 2.067 | 0.9515 | 0.9503 | 1.734 | 1.284 | 4.054 | 3.028 |
| 40_90_56 | 15.39 | 2.062 | 2.156 | 0.9457 | 0.9504 | 1.741 | 1.277 | 4.529 | 3.841 |
| 40_100_60 | 16.40 | 2.132 | 2.232 | 0.9400 | 0.9502 | 1.749 | 1.269 | 4.683 | 4.355 |
| 40_110_64 | 18.12 | 2.199 | 2.288 | 0.9348 | 0.9503 | 1.756 | 1.262 | 4.049 | 4.651 |
| 40_120_68 | 16.81 | 2.256 | 2.327 | 0.9295 | 0.9501 | 1.763 | 1.255 | 3.158 | 4.904 |
| 50_00_31 | 2.818 | 0.6329 | 0.6375 | 1.013 | 0.9498 | 1.657 | 1.361 | 0.7286 | 6.1871E-02 |
| 50_10_33 | 5.588 | 0.9254 | 0.9532 | 1.001 | 0.9506 | 1.672 | 1.346 | 3.003 | 0.3605 |
| 50_20_36 | 8.222 | 1.160 | 1.216 | 0.9902 | 0.9502 | 1.684 | 1.334 | 4.838 | 1.060 |
| 50_30_39 | 10.67 | 1.352 | 1.435 | 0.9815 | 0.9505 | 1.695 | 1.323 | 6.163 | 2.008 |
| 50_40_42 | 12.44 | 1.508 | 1.609 | 0.9733 | 0.9504 | 1.705 | 1.313 | 6.719 | 2.910 |
| 50_50_46 | 13.94 | 1.644 | 1.758 | 0.9661 | 0.9505 | 1.714 | 1.303 | 6.944 | 4.001 |
| 50_60_49 | 15.09 | 1.757 | 1.887 | 0.9587 | 0.9502 | 1.723 | 1.295 | 7.390 | 6.217 |
| 50_70_53 | 13.03 | 1.855 | 1.955 | 0.9524 | 0.9502 | 1.731 | 1.287 | 5.353 | 5.830 |
| 50_80_56 | 16.73 | 1.949 | 2.004 | 0.9463 | 0.9501 | 1.739 | 1.279 | 2.807 | 4.003 |
| 50_90_60 | 16.70 | 2.011 | 2.101 | 0.9407 | 0.9502 | 1.747 | 1.271 | 4.501 | 3.444 |
| 50_100_64 | 18.15 | 2.090 | 2.183 | 0.9351 | 0.9500 | 1.754 | 1.264 | 4.434 | 3.907 |
| 50_110_68 | 17.53 | 2.154 | 2.223 | 0.9297 | 0.9498 | 1.762 | 1.256 | 3.205 | 4.270 |
| 50_120_72 | 19.13 | 2.213 | 2.288 | 0.9250 | 0.9501 | 1.768 | 1.250 | 3.417 | 4.378 |
| 60_00_35 | 4.247 | 0.7126 | 0.7205 | 1.003 | 0.9498 | 1.667 | 1.352 | 1.108 | 0.1270 |
| 60_10_37 | 6.862 | 0.9679 | 1.002 | 0.9934 | 0.9509 | 1.680 | 1.338 | 3.520 | 0.4827 |
| 60_20_40 | 9.669 | 1.179 | 1.240 | 0.9831 | 0.9503 | 1.692 | 1.326 | 5.202 | 1.236 |
| 60_30_43 | 12.01 | 1.354 | 1.435 | 0.9747 | 0.9502 | 1.702 | 1.316 | 5.973 | 2.132 |
| 60_40_46 | 13.48 | 1.500 | 1.593 | 0.9672 | 0.9503 | 1.712 | 1.306 | 6.170 | 2.806 |
| 60_50_50 | 15.36 | 1.627 | 1.732 | 0.9601 | 0.9504 | 1.721 | 1.297 | 6.467 | 3.895 |
| 60_60_53 | 16.79 | 1.734 | 1.851 | 0.9528 | 0.9499 | 1.729 | 1.289 | 6.731 | 5.666 |
| 60_70_57 | 15.88 | 1.829 | 1.934 | 0.9473 | 0.9502 | 1.737 | 1.281 | 5.736 | 6.958 |
| 60_80_61 | 13.66 | 1.918 | 1.968 | 0.9428 | 0.9514 | 1.745 | 1.273 | 2.622 | 4.555 |
| 60_90_64 | 17.29 | 2.009 | 2.063 | 0.9359 | 0.9501 | 1.753 | 1.265 | 2.640 | 1.637 |
| 60_100_68 | 17.62 | 2.049 | 2.122 | 0.9304 | 0.9497 | 1.760 | 1.258 | 3.560 | 3.718 |
| 60_110_72 | 17.50 | 2.118 | 2.177 | 0.9257 | 0.9501 | 1.767 | 1.251 | 2.811 | 4.023 |
| 60_120_76 | 17.78 | 2.174 | 2.222 | 0.9217 | 0.9510 | 1.774 | 1.244 | 2.209 | 4.211 |
| 70_00_39 | 5.731 | 0.7825 | 0.7975 | 0.9949 | 0.9497 | 1.675 | 1.343 | 1.908 | 0.2335 |
| 70_10_41 | 8.418 | 1.009 | 1.048 | 0.9860 | 0.9509 | 1.688 | 1.330 | 3.845 | 0.6755 |
| 70_20_44 | 11.09 | 1.201 | 1.265 | 0.9767 | 0.9504 | 1.699 | 1.319 | 5.345 | 1.317 |
| 70_30_47 | 13.41 | 1.361 | 1.441 | 0.9688 | 0.9504 | 1.709 | 1.309 | 5.859 | 2.187 |
| 70_40_51 | 14.99 | 1.496 | 1.591 | 0.9615 | 0.9503 | 1.718 | 1.300 | 6.348 | 2.859 |
| 70_50_54 | 16.87 | 1.617 | 1.712 | 0.9543 | 0.9501 | 1.727 | 1.291 | 5.843 | 3.756 |
| 70_60_57 | 17.89 | 1.718 | 1.823 | 0.9479 | 0.9500 | 1.735 | 1.283 | 6.140 | 4.746 |
| 70_70_61 | 18.26 | 1.812 | 1.928 | 0.9423 | 0.9503 | 1.743 | 1.275 | 6.353 | 6.812 |
| 70_80_65 | 16.37 | 1.896 | 1.962 | 0.9363 | 0.9499 | 1.751 | 1.267 | 3.469 | 5.948 |
| 70_90_68 | 9.135 | 1.980 | 1.988 | 0.9317 | 0.9506 | 1.758 | 1.260 | 0.3692 | 0.1186 |
| 70_100_72 | 18.64 | 2.007 | 2.094 | 0.9267 | 0.9506 | 1.765 | 1.253 | 4.327 | 3.356 |
| 70_110_76 | 18.23 | 2.088 | 2.147 | 0.9219 | 0.9507 | 1.772 | 1.246 | 2.792 | 3.707 |
| 70_120_80 | 17.89 | 2.145 | 2.184 | 0.9171 | 0.9506 | 1.779 | 1.239 | 1.846 | 4.043 |
| 80_00_42 | 7.247 | 0.8436 | 0.8697 | 0.9869 | 0.9497 | 1.684 | 1.335 | 3.094 | 0.2402 |
| 80_10_45 | 9.865 | 1.049 | 1.095 | 0.9794 | 0.9513 | 1.695 | 1.323 | 4.371 | 0.7359 |
| 80_20_48 | 12.28 | 1.226 | 1.290 | 0.9697 | 0.9500 | 1.706 | 1.312 | 5.206 | 1.327 |
| 80_30_51 | 14.38 | 1.370 | 1.454 | 0.9626 | 0.9503 | 1.715 | 1.303 | 6.088 | 2.102 |
| 80_40_54 | 16.47 | 1.500 | 1.594 | 0.9549 | 0.9497 | 1.724 | 1.294 | 6.263 | 2.799 |
| 80_50_58 | 17.63 | 1.612 | 1.706 | 0.9492 | 0.9503 | 1.733 | 1.285 | 5.842 | 3.329 |
| 80_60_61 | 18.84 | 1.712 | 1.814 | 0.9436 | 0.9507 | 1.741 | 1.277 | 5.984 | 3.990 |
| 80_70_65 | 19.27 | 1.799 | 1.898 | 0.9372 | 0.9501 | 1.749 | 1.269 | 5.555 | 4.728 |
| 80_80_69 | 17.96 | 1.880 | 1.935 | 0.9321 | 0.9503 | 1.756 | 1.262 | 2.921 | 3.774 |
| 80_90_73 | 13.42 | 1.957 | 1.982 | 0.9266 | 0.9500 | 1.764 | 1.254 | 1.312 | 0.6938 |
| 80_100_76 | 18.53 | 2.008 | 2.065 | 0.9220 | 0.9504 | 1.770 | 1.247 | 2.839 | 1.773 |
| 80_110_80 | 18.41 | 2.059 | 2.117 | 0.9176 | 0.9507 | 1.777 | 1.241 | 2.847 | 3.632 |
| 80_120_84 | 18.26 | 2.117 | 2.157 | 0.9122 | 0.9496 | 1.784 | 1.234 | 1.872 | 3.986 |
| 90_00_46 | 8.679 | 0.9022 | 0.9354 | 0.9802 | 0.9501 | 1.691 | 1.327 | 3.678 | 0.3981 |
| 90_10_49 | 11.45 | 1.090 | 1.146 | 0.9717 | 0.9502 | 1.702 | 1.315 | 5.148 | 0.8099 |
| 90_20_52 | 12.44 | 1.247 | 1.323 | 0.9640 | 0.9503 | 1.712 | 1.305 | 6.100 | 1.079 |
| 90_30_55 | 16.14 | 1.383 | 1.475 | 0.9571 | 0.9504 | 1.722 | 1.296 | 6.607 | 2.158 |
| 90_40_58 | 17.45 | 1.506 | 1.597 | 0.9499 | 0.9501 | 1.731 | 1.287 | 6.012 | 2.629 |
| 90_50_62 | 18.70 | 1.609 | 1.706 | 0.9438 | 0.9501 | 1.739 | 1.279 | 6.003 | 2.901 |
| 90_60_65 | 18.77 | 1.703 | 1.789 | 0.9381 | 0.9502 | 1.747 | 1.271 | 5.045 | 3.047 |
| 90_70_69 | 18.43 | 1.787 | 1.852 | 0.9324 | 0.9500 | 1.754 | 1.263 | 3.623 | 3.117 |
| 90_80_73 | 17.72 | 1.868 | 1.909 | 0.9269 | 0.9497 | 1.762 | 1.256 | 2.217 | 2.354 |
| 90_90_76 | 14.40 | 1.940 | 1.956 | 0.9221 | 0.9499 | 1.769 | 1.249 | 0.8079 | 0.8326 |
| 90_100_80 | 18.53 | 2.009 | 2.038 | 0.9176 | 0.9503 | 1.776 | 1.242 | 1.484 | 1.095 |
| 90_110_84 | 18.97 | 2.021 | 2.094 | 0.9129 | 0.9502 | 1.783 | 1.235 | 3.625 | 3.669 |
| 90_120_88 | 17.79 | 2.090 | 2.129 | 0.9077 | 0.9494 | 1.789 | 1.229 | 1.827 | 3.862 |
| 100_00_50 | 10.07 | 0.9544 | 0.9970 | 0.9732 | 0.9499 | 1.699 | 1.319 | 4.471 | 0.4341 |
| 100_10_53 | 12.78 | 1.127 | 1.186 | 0.9649 | 0.9499 | 1.710 | 1.308 | 5.262 | 0.9629 |
| 100_16_55 | 13.69 | 1.215 | 1.287 | 0.9610 | 0.9501 | 1.715 | 1.302 | 5.901 | 1.023 |
| 100_20_56 | 10.86 | 1.271 | 1.324 | 0.9583 | 0.9502 | 1.719 | 1.299 | 4.120 | 0.8295 |
| 100_22_56 | 15.40 | 1.309 | 1.381 | 0.9412 | 0.9362 | 1.722 | 1.296 | 5.552 | 1.648 |
| 100_24_58 | 15.90 | 1.326 | 1.406 | 0.9552 | 0.9499 | 1.722 | 1.295 | 6.105 | 1.792 |
| 100_26_58 | 16.42 | 1.352 | 1.435 | 0.9538 | 0.9499 | 1.724 | 1.293 | 6.137 | 1.888 |
| 100_28_59 | 17.07 | 1.375 | 1.464 | 0.9527 | 0.9501 | 1.726 | 1.291 | 6.475 | 1.983 |
| 100_30_59 | 17.29 | 1.398 | 1.490 | 0.9511 | 0.9500 | 1.728 | 1.289 | 6.561 | 2.075 |
| 100_32_60 | 17.74 | 1.423 | 1.517 | 0.9499 | 0.9499 | 1.730 | 1.288 | 6.596 | 2.165 |
| 100_36_61 | 18.37 | 1.467 | 1.567 | 0.9475 | 0.9501 | 1.733 | 1.284 | 6.819 | 2.183 |
| 100_40_63 | 18.77 | 1.509 | 1.608 | 0.9450 | 0.9500 | 1.736 | 1.281 | 6.553 | 2.304 |
| 100_44_64 | 19.25 | 1.551 | 1.653 | 0.9426 | 0.9500 | 1.740 | 1.278 | 6.569 | 2.360 |
| 100_48_65 | 19.16 | 1.591 | 1.684 | 0.9400 | 0.9500 | 1.743 | 1.275 | 5.807 | 2.555 |
| 100_50_65 | 19.11 | 1.613 | 1.704 | 0.9381 | 0.9501 | 1.745 | 1.274 | 5.628 | 2.649 |
| 100_55_67 | 19.04 | 1.659 | 1.739 | 0.9352 | 0.9500 | 1.749 | 1.270 | 4.839 | 2.808 |
| 100_56_67 | 18.93 | 1.667 | 1.742 | 0.9347 | 0.9501 | 1.750 | 1.269 | 4.522 | 2.692 |
| 100_60_68 | 19.04 | 1.702 | 1.775 | 0.9325 | 0.9500 | 1.753 | 1.266 | 4.326 | 2.720 |
| 100_64_70 | 18.76 | 1.733 | 1.799 | 0.9303 | 0.9500 | 1.756 | 1.263 | 3.774 | 2.676 |
| 100_68_72 | 18.46 | 1.771 | 1.825 | 0.9279 | 0.9494 | 1.759 | 1.259 | 3.080 | 2.452 |
| 100_70_73 | 18.23 | 1.784 | 1.841 | 0.9277 | 0.9500 | 1.760 | 1.258 | 3.166 | 2.452 |
| 100_80_77 | 16.73 | 1.855 | 1.885 | 0.9261 | 0.9532 | 1.767 | 1.251 | 1.617 | 1.818 |
| 100_90_80 | 13.86 | 1.931 | 1.936 | 0.9172 | 0.9494 | 1.774 | 1.244 | 0.2833 | 0.7382 |
| 100_95_82 | 11.27 | 1.967 | 1.964 | 0.9243 | 0.9582 | 1.777 | 1.241 | -0.1435 | 6.8954E-02 |
| 100_105_86 | 16.96 | 2.019 | 2.045 | 0.9233 | 0.9617 | 1.783 | 1.235 | 1.268 | 1.425 |
| 100_110_88 | 18.88 | 2.020 | 2.073 | 0.9229 | 0.9634 | 1.786 | 1.232 | 2.618 | 2.366 |
| 100_120_92 | 17.63 | 2.064 | 2.113 | 0.9044 | 0.9501 | 1.794 | 1.224 | 2.379 | 3.790 |
| 110_00_54 | 11.70 | 1.006 | 1.060 | 0.9663 | 0.9498 | 1.706 | 1.312 | 5.370 | 0.4642 |
| 110_10_57 | 13.97 | 1.160 | 1.232 | 0.9593 | 0.9502 | 1.716 | 1.301 | 6.136 | 0.8247 |
| 110_20_60 | 15.75 | 1.298 | 1.372 | 0.9526 | 0.9504 | 1.726 | 1.292 | 5.739 | 1.330 |
| 110_30_63 | 18.56 | 1.415 | 1.516 | 0.9455 | 0.9500 | 1.734 | 1.284 | 7.122 | 1.849 |
| 110_40_66 | 19.50 | 1.521 | 1.622 | 0.9398 | 0.9503 | 1.743 | 1.275 | 6.602 | 1.921 |
| 110_50_70 | 19.07 | 1.618 | 1.696 | 0.9336 | 0.9498 | 1.751 | 1.267 | 4.873 | 2.085 |
| 110_60_73 | 18.32 | 1.702 | 1.761 | 0.9291 | 0.9507 | 1.758 | 1.260 | 3.471 | 2.033 |
| 110_70_77 | 17.13 | 1.782 | 1.816 | 0.9237 | 0.9504 | 1.766 | 1.252 | 1.948 | 1.838 |
| 110_80_81 | 15.56 | 1.853 | 1.871 | 0.9192 | 0.9508 | 1.773 | 1.245 | 0.9878 | 1.332 |
| 110_90_84 | 13.12 | 1.923 | 1.926 | 0.9142 | 0.9506 | 1.780 | 1.238 | 0.1639 | 0.5301 |
| 110_95_86 | 10.73 | 1.963 | 1.955 | 0.9095 | 0.9486 | 1.783 | 1.235 | -0.3746 | 8.1449E-04 |
| 110_110_92 | 17.29 | 2.020 | 2.055 | 0.9056 | 0.9509 | 1.793 | 1.225 | 1.768 | 2.045 |
| 110_120_95 | 17.55 | 2.048 | 2.095 | 0.9014 | 0.9510 | 1.799 | 1.219 | 2.314 | 3.774 |
| 120_00_57 | 13.14 | 1.050 | 1.117 | 0.9599 | 0.9497 | 1.714 | 1.305 | 6.304 | 0.4861 |
| 120_10_60 | 14.81 | 1.196 | 1.268 | 0.9534 | 0.9501 | 1.723 | 1.295 | 6.054 | 0.8382 |
| 120_20_63 | 17.57 | 1.323 | 1.409 | 0.9458 | 0.9494 | 1.732 | 1.286 | 6.504 | 1.409 |
| 120_30_67 | 19.50 | 1.435 | 1.539 | 0.9407 | 0.9503 | 1.741 | 1.277 | 7.263 | 1.529 |
| 120_40_70 | 19.38 | 1.534 | 1.621 | 0.9335 | 0.9492 | 1.749 | 1.269 | 5.695 | 1.632 |
| 120_50_74 | 18.34 | 1.621 | 1.684 | 0.9294 | 0.9503 | 1.756 | 1.262 | 3.910 | 1.864 |
| 120_60_77 | 17.24 | 1.703 | 1.743 | 0.9246 | 0.9507 | 1.764 | 1.254 | 2.381 | 1.733 |
| 120_70_81 | 16.02 | 1.780 | 1.803 | 0.9197 | 0.9509 | 1.771 | 1.247 | 1.312 | 1.511 |
| 120_80_84 | 14.49 | 1.850 | 1.860 | 0.9150 | 0.9509 | 1.778 | 1.240 | 0.5347 | 1.076 |
| 120_90_88 | 12.18 | 1.918 | 1.918 | 0.9096 | 0.9501 | 1.785 | 1.233 | -4.1127E-02 | 0.3613 |
| 120_95_90 | 10.06 | 1.957 | 1.950 | 0.9071 | 0.9499 | 1.788 | 1.230 | -0.3241 | 0.000 |
| 120_115_97 | 16.46 | 2.020 | 2.066 | 0.8983 | 0.9497 | 1.801 | 1.216 | 2.258 | 2.404 |
| 120_120_99 | 17.58 | 2.008 | 2.092 | 0.8967 | 0.9501 | 1.804 | 1.213 | 4.186 | 3.647 |
Flexibility
The magnetic configurations of TJ-II offer ample flexibility in terms of rotational transform, plasma volume, and magnetic well, among others. The diagram shows the variation in the rotational transform as a function of and . The plasma size rav increases with , so that reasonably-sized plasmas are limited to the upper right triangle of this diagram.
Only some of the available range of configurations has been explored experimentally, as in the so-called well scan experiments[1]. Furthermore, the impact of the magnetic configuration on enhanced confinement has been studied[2][3].
See also
References
- ↑ A.M. de Aguilera, F. Castejón, E. Ascasíbar, E. Blanco, E. de la Cal, C. Hidalgo, B. Liu, A. López- Fraguas, F. Medina, M.A. Ochando, I. Pastor, M.A. Pedrosa, B. van Milligen, and the TJ-II Team. Magnetic well scan and confinement in the TJ-II stellarator. Nucl. Fusion, 55(11):113014, 2015.
- ↑ Boudewijn Philip van Milligen, Teresa Estrada, Benjamin Carreras, Luis García, and TJ-II Team. Importance of the rotational transform for L–H transitions in the TJ-II stellarator. Plasma, 7(2):446–464, 2024.
- ↑ B.Ph. van Milligen, I. García-Cortés, K.J. McCarthy, B.A. Carreras, L. García, A. Cappa, P. Pons- Villalonga, T. Estrada, D. Medina-Roque, J. Hernández Sánchez, R. García, O.S. Kozachok, O.O. Chmyga, J.L. de Pablos, J.M. Barcala, A. Molinero, I. Pastor, D. Tafalla, A. de la Peña, F. Lapayese, and the TJ-II Team. The rotational transform and enhanced confinement in the TJ-II stellarator. J. Plasma Phys., 91(4):E98, 2025.