Plasma vortexes induced by an external rotating helical magnetic perturbation in tokamaks

Pankratov, I. M.; Omel'chenko, A.Ya.; Olshansky, V.V.

doi:10.1016/j.physleta.2005.06.002

Cited by 3 publications

(11 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these experiments it was found that |B ∼ r | was amplified almost over the whole radial range by up to a few ten per cent of the vacuum field, while |B ∼ θ | was attenuated at around the resonant surface and amplified at r < 6.5 cm. Our calculations show that in these experiments a very wide interaction region occurred ( figure 1(a)) and the plasma response was not so strong (see also [11]).…”

Section: Tokamaks Cstn-iv and Hybtok-iimentioning

confidence: 59%

“…In that paper the analytic solution of equations (9) and (10) was found assuming that the vacuum DED coil perturbation of the magnetic field plays a dominant role and the plasma response is small. But for f = 10 kHz and f = 20 kHz the plasma response is very strong and the approximations of the paper [11] are not valid.…”

Section: Textor-dedmentioning

confidence: 90%

“…In the opposite case, the resistive effects dominate in a broader region than that defined by the Alfvén resonances. From equation (13) the following estimate of the half width of the interaction (resonant) zone can be made (see also [15]):…”

Section: Basic Equationsmentioning

confidence: 99%

“…Note that because |B ∼ r | grows towards the antenna, |V ∼ r | has a finite value when r → a. Unlike the basic equations of the paper [11] (the one-fluid MHD) the equations ( 9) and (10) contain two frequencies: ω and ω i . Sometimes the two-fluid MHD model is used under assumptions that both ion and electron responses to the perturbations are incompressible and the ion and electron thermal conductivities are low enough (see [8] and review paper [12]).…”

Section: Basic Equationsmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of plasma response influence on the penetration of an external low frequency helical perturbation into a tokamak edge plasma

et al. 2004

View full text Add to dashboard Cite

The plasma response influence on the penetration of an external low frequency helical perturbation into a tokamak edge plasma has been studied on the basis of the two-fluid MHD equations in the linear approximation for the cylindrical model. Components of the penetrating field, the plasma flows, the perturbation current density distribution and the radial profile of the poloidal driven force density are found in the resonant region and investigated for the parameters of the TEXTOR-DED, CSTN-IV and HYBTOK-II tokamaks. Preliminary comparisons with the CSTN-IV and HYBTOK-II experiments are made and a good qualitative agreement has been found.

show abstract

Section: Tokamaks Cstn-iv and Hybtok-iimentioning

confidence: 59%

Section: Textor-dedmentioning

confidence: 90%

Section: Basic Equationsmentioning

confidence: 99%

Section: Basic Equationsmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of plasma response influence on the penetration of an external low frequency helical perturbation into a tokamak edge plasma

et al. 2004

View full text Add to dashboard Cite

show abstract

“…The first nonlinearity enters in the conventional way namely due to the nonlinear terms of the equation. It has been estimated by Pankratov et al [23], that the nonlinear terms become important for a DED current higher than 5 kA. It is expected that the nonlinearities lead to a growth of modes as, e.g.…”

Section: Discussionmentioning

confidence: 97%

Modelling of the field line penetration and force transfer by the dynamic ergodic divertor of TEXTOR

et al. 2004

View full text Add to dashboard Cite

For describing the penetration of the external dynamic ergodic divertor magnetic field into the plasma, a single fluid magnetohydrodynamic model has been applied which contains all three components of the magnetic and electric field, the electrical currents and the flow pattern. The set of equations is solved numerically. The analysis shows that the external magnetic field penetrates nearly unperturbed into the plasma edge; at the resonance layer, where the external coils are parallel to the internal magnetic field lines, a strong shielding current is generated. Depending on the frequency difference between the external field and the plasma, the width and the amplitude of the shielding current varies: With increasing frequency, the amplitude and the width of the resonant layer grows while with decreasing frequency both quantities are diminished. The model predicts that the shielding current is connected with a localized flow of the plasma. The force transfer function is calculated from the integration of the j × B term. Differences between the expected edge and core interactions are discussed.

show abstract

The effect of the rotating helical fields on the plasma edge in the HYBTOK-II Tokamak

Budaev¹,

Pankratov²,

Takamura³

et al. 2006

Nucl. Fusion

View full text Add to dashboard Cite

An experiment with rotating helical magnetic fields (RHMF) in the HYBTOK-II tokamak is reported. The effect of the RHMF rotation with a frequency of 5 kHz on the poloidal rotation of plasma density perturbation was studied by a movable multi-pin Langmuir probe. The wavelet technique has been used to study the poloidal rotation of the bursts. During the RHMF operation the poloidal direction of the plasma density perturbation rotation coincides with the direction of the RHMF rotation. The effect of the RHMF is found to be essential up to minor radius r = 6 cm.

show abstract

Plasma vortexes induced by an external rotating helical magnetic perturbation in tokamaks

Cited by 3 publications

References 8 publications

Investigation of plasma response influence on the penetration of an external low frequency helical perturbation into a tokamak edge plasma

Investigation of plasma response influence on the penetration of an external low frequency helical perturbation into a tokamak edge plasma

Modelling of the field line penetration and force transfer by the dynamic ergodic divertor of TEXTOR

The effect of the rotating helical fields on the plasma edge in the HYBTOK-II Tokamak

Contact Info

Product

Resources

About