Active Control of Alfvén Eigenmodes by Externally Applied 3D Magnetic Perturbations

Gonzalez-Martin, J.; García-Muñoz, M.; Galdón-Quiroga, J.; Todo, Y.; Dominguez-Palacios, J.; Dunne, M.; Vuuren, A. Jansen van; Liu, Yueqiang; Sanchis, L.; Spong, D. A.; Suttrop, W.; Wang, X.; Willensdorfer, M.

doi:10.1103/physrevlett.130.035101

Cited by 10 publications

(14 citation statements)

References 36 publications

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“…Its successful validation implies that ERMP can give insight into the design or upgrade of 3D coils to maximize its benefit 28 . Furthermore, the underlying theoretical framework is highly adaptable and can be extended to address challenges in burning plasmas, including the activity of Alfven eigenmodes induced by fusion products 57 , 58 . Its application to the torque matrix 11 can also improve plasma rotation control, which is essential in controlling various plasma instabilities to sustain a more favorable plasma regime in the fusion reactor.…”

Section: Resultsmentioning

confidence: 99%

Tailoring tokamak error fields to control plasma instabilities and transport

Yang,

Park,

Jeon

et al. 2024

Nat Commun

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A tokamak relies on the axisymmetric magnetic fields to confine fusion plasmas and aims to deliver sustainable and clean energy. However, misalignments arise inevitably in the tokamak construction, leading to small asymmetries in the magnetic field known as error fields (EFs). The EFs have been a major concern in the tokamak approaches because small EFs, even less than 0.1%, can drive a plasma disruption. Meanwhile, the EFs in the tokamak can be favorably used for controlling plasma instabilities, such as edge-localized modes (ELMs). Here we show an optimization that tailors the EFs to maintain an edge 3D response for ELM control with a minimized core 3D response to avoid plasma disruption and unnecessary confinement degradation. We design and demonstrate such an edge-localized 3D response in the KSTAR facility, benefiting from its unique flexibility to change many degrees of freedom in the 3D coil space for the various fusion plasma regimes. This favorable control of the tokamak EF represents a notable advance for designing intrinsically 3D tokamaks to optimize stability and confinement for next-step fusion reactors.

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Section: Resultsmentioning

confidence: 99%

Tailoring tokamak error fields to control plasma instabilities and transport

Yang,

Park,

Jeon

et al. 2024

Nat Commun

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“…The proposed method proves its robustness in various scenarios for correcting the most disruptive n = 1 3D field and highlights its potential for use in future reactors. Furthermore, the underlying theoretical framework is highly adaptable and can be extended to address challenges in burning plasmas, including the activity of Alfven eigenmode induced by fusion products [50,51]. The ERMP approach, in particular, will be a robust means of controlling the six rows of 3D coils in ITER, while also inspiring the design of more advanced tokamaks with 3D magnetic field geometries for optimal plasma stability and confinement.…”

Section: Discussionmentioning

confidence: 99%

Tailoring error field of tokamak to control plasma instability and transport

Yang

Park

Jeon

et al. 2023

Preprint

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A tokamak relies on the axisymmetric magnetic fields to confine fusion plasmas and aims to deliver sustainable and clean energy. However, misalignments arise inevitably in the tokamak construction, leading to small asymmetries in the magnetic field known as error fields (EFs). The EFs have been a major concern in the tokamak approaches because a small level EFs, even less than 0.1 %, can drive a plasma disruption. Contrary to conventional wisdom, we report that the EFs in a tokamak can be favorably used for controlling plasma instabilities, such as edge-localized modes (ELMs), while maintaining a hot fusion plasma at a temperature of 100 million kelvin. A novel optimization tailors the EFs to maintain an edge 3D response for ELM control with a minimized core 3D response to avoid plasma disruption and unnecessary degradation. We design and demonstrate such an edge-localized 3D response at the Korean Superconducting Tokamak Advanced Research facility, benefiting from its unique flexibility to change many degrees of freedom in the 3D coil space for the various fusion plasma regimes. This favorable control of the tokamak EF represents a notable advance for designing intrinsically 3D tokamaks to optimize stability and confinement for the next-step fusion reactors.

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“…One of the primary identified causes for this particle transport and subsequent loss is their interaction with a broad spectrum of magnetic fluctuations. These fluctuations can be intrinsic to the plasma, such as neoclassical tearing modes [6,7], fishbones [8][9][10], or Alfvén eigenmodes [11][12][13][14][15][16][17], or they can result from externally applied perturbations [18][19][20][21]. Understanding and controlling these interactions are critical steps towards achieving sustainable fusion energy production.…”

Section: Introductionmentioning

confidence: 99%

Tomographic reconstructions of the fast-ion phase space using imaging neutral particle analyser measurements

Rueda-Rueda,

Garcia-Munoz,

Viezzer

et al. 2024

Plasma Phys. Control. Fusion

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In this paper we demonstrate how the inversion, in energy and major radius (E, R) coordinates, of imagingneutral particle analyser (INPA) measurements can be used to obtain the fast-ion distribution. The INPA ismost sensitive to passing ions with energies in the range (20-150) keV and pitches near 0.5 in the core and 0.7near the plasma edge. Inversion of synthetic signals, via 0th -order Tikhonov and Elastic Net regularization,were performed to demonstrate the capability of recovering the ground truth fast-ion 2D phase-space distri-bution resolved in major radius and energy, even in the presence of moderate noise levels (10%). Finally,we apply our method to measure the 2D phase-space distribution in an MHD quiescent plasma at ASDEXUpgrade and find good agreement with the neoclassical fast-ion distribution predicted by TRANSP.

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Active Control of Alfvén Eigenmodes by Externally Applied 3D Magnetic Perturbations

Cited by 10 publications

References 36 publications

Tailoring tokamak error fields to control plasma instabilities and transport

Tailoring tokamak error fields to control plasma instabilities and transport

Tailoring error field of tokamak to control plasma instability and transport

Tomographic reconstructions of the fast-ion phase space using imaging neutral particle analyser measurements

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