2014
DOI: 10.1088/0029-5515/54/4/043008
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Magnetic configuration sweep control in heliac type stellarators

Abstract: A novel magnetic configuration sweep control system for the TJ-II Heliac device is described. The system is prepared to establish a reference for plasma, torus or vessel current while the coil configuration currents are swept during a single plasma discharge. It can also be run in a special simulation mode, which does not require powering the TJ-II device, intended for commissioning and experiment preparation purposes. Preliminary tests with the system have shown its ability to perform rotational transform sca… Show more

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Cited by 3 publications
(3 citation statements)
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“…However, the TJ-II Heliac can also perform that is needed to explain the frequency evolution in figure 13(a). dynamic configuration scans where the rotational transform evolves during the discharge with little change in magnetic shear with respect to the vacuum values [18,21]. Such scans brought up striking signatures of IFCMs due precisely to the movement of the resonances throughout the plasma.…”
Section: Discussionmentioning
confidence: 99%
“…However, the TJ-II Heliac can also perform that is needed to explain the frequency evolution in figure 13(a). dynamic configuration scans where the rotational transform evolves during the discharge with little change in magnetic shear with respect to the vacuum values [18,21]. Such scans brought up striking signatures of IFCMs due precisely to the movement of the resonances throughout the plasma.…”
Section: Discussionmentioning
confidence: 99%
“…The chosen way to scan the magnetic configuration consists in changing the vacuum iota, whilst keeping constant iota shear and the shape and structure of |B| [36]. As shown in figure 5(b), the difference in the plasma volume of the extreme configurations is negligible (∼5%).…”
Section: Iota Effect On Ae Behaviourmentioning
confidence: 99%
“…TJ-II is a four-field period flexible heliac with a major radius R = 1.5 m, an averaged minor radius ā ≤ 0.22 m, and an equilibrium magnetic field of B 0 = 0.95 T. Experiments have been performed at the TJ-II stellarator to investigate the up or down frequency sweeping of NBI-driven Alfvén eigenmodes by varying the magnetic configuration during a discharge. The magnetic configuration has been linearly varied over a time period of 60 ms by changing currents in helical coils [68]. The variations in iota profile appear due to the variations in plasma current for different reasons (skin current, dynamic configuration, changes in vertical/poloidal field, electron cyclotron current drive [69] and neutral beam current drive).…”
Section: Experimental Observationsmentioning
confidence: 99%