Generation and suppression of runaway electrons in MST tokamak plasmas

Munaretto, S.; Chapman, B.E.; Cornille, Brian; DuBois, Ami M.; McCollam, K. J.; Sovinec, C. R.; Almagri, A. F.; Goetz, J. A.

doi:10.1088/1741-4326/ab73c0

Cited by 12 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[5] from runaway electron deconfinement experiments in the Madison Symmetric Torus (MST) reported in Ref. [21]. The NIMROD spatial representation uses structured, C 0 -continuous, Lagrange spectral elements in the poloidal plane and a finite series of Fourier modes in the toroidal direction.…”

Section: Nimrod Magnetic Fieldsmentioning

confidence: 99%

A divergence-free constrained magnetic field interpolation method for scattered data

Yang¹,

del‐Castillo‐Negrete²,

Zhang³

et al. 2022

Preprint

View full text Add to dashboard Cite

An interpolation method to evaluate magnetic fields given unstructured, scattered magnetic data is presented. The method is based on the reconstruction of the global magnetic field using a superposition of orthogonal functions. The coefficients of the expansion are obtained by minimizing a cost function defined as the L 2 norm of the difference between the ground truth and the reconstructed magnetic field evaluated on the training data. The divergencefree condition is incorporated as a constrain in the cost function allowing the method to achieve arbitrarily small errors in the magnetic field divergence. An exponential decay of the approximation error is observed and compared with the less favorable algebraic decay of local splines. Compared to local methods involving computationally expensive search algorithms, the proposed method exhibits a significant reduction of the computational complexity of the field evaluation, while maintaining a small error in the divergence even in the presence of magnetic islands and stochasticity. Applications to the computation of Poincaré sections using data obtained from numerical solutions of the magnetohydrodynamic equations in toroidal geometry are presented and compared with local methods currently in use.

show abstract

Section: Nimrod Magnetic Fieldsmentioning

confidence: 99%

A divergence-free constrained magnetic field interpolation method for scattered data

Yang¹,

del‐Castillo‐Negrete²,

Zhang³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The most studied mitigation method is massive material injection (gas or shattered pellet) either before or after RE beam formation [6][7][8][9]. RE avoidance has also been pursued via applied 3D magnetic fields, with the resulting stochasticity transporting REs out of the plasma [10][11][12][13][14][15][16][17]. While initial results are promising, fully stochastic fields have not yet been achieved [18,19], and this is still an active mitigation scheme.…”

Section: Introductionmentioning

confidence: 99%

Modeling the complete prevention of disruption-generated runaway electron beam formation with a passive 3D coil in SPARC

Tinguely

Izzo²,

Garnier

et al. 2021

Nucl. Fusion

View full text Add to dashboard Cite

The potential formation of multi-mega-ampere beams of relativistic ‘runaway’ electrons (REs) during sudden terminations of tokamak plasmas poses a significant challenge to the tokamak’s development as a fusion energy source. Here, we use state-of-the-art modeling of disruption magnetohydrodynamics coupled with a self-consistent evolution of RE generation and transport to show that a non-axisymmetric in-vessel coil will passively prevent RE beam formation during disruptions in the SPARC tokamak, a compact, high-field, high-current device capable of achieving a fusion gain Q > 2 in deuterium–tritium plasmas.

show abstract

mentioning

confidence: 99%

Modeling the complete prevention of disruption-generated runaway electron beam formation with a passive 3D coil in SPARC

Tinguely,

Izzo,

Garnier

et al. 2021

Preprint

View full text Add to dashboard Cite

The potential formation of multi-mega-ampere beams of relativistic "runaway" electrons (REs) during sudden terminations of tokamak plasmas poses a significant challenge to the tokamak's development as a fusion energy source. Here, we use state-of-the-art modeling of disruption magnetohydrodynamics coupled with a self-consistent evolution of RE generation and transport to show that a non-axisymmetric in-vessel coil will passively prevent RE beam formation during disruptions in the SPARC tokamak, a compact, high-field, high-current device capable of achieving a fusion gain Q > 2 in deuterium-tritium plasmas.

show abstract

Generation and suppression of runaway electrons in MST tokamak plasmas

Cited by 12 publications

References 48 publications

A divergence-free constrained magnetic field interpolation method for scattered data

A divergence-free constrained magnetic field interpolation method for scattered data

Modeling the complete prevention of disruption-generated runaway electron beam formation with a passive 3D coil in SPARC

Modeling the complete prevention of disruption-generated runaway electron beam formation with a passive 3D coil in SPARC

Contact Info

Product

Resources

About