Modeling of frequency-sweeping Alfvén modes in the TJ-II stellarator

被引：1

作者：

Ghiozzi, A. G. ^{[1
]}

Mantsinen, M. J. ^{[1
,2
]}

Pastells, P. ^{[1
]}

Spong, D. A. ^{[3
]}

Melnikov, A. V. ^{[4
,5
,6
]}

Eliseev, L. G. ^{[4
]}

Sharapov, S. E. ^{[7
]}

机构：

[1] Barcelona Supercomp Ctr, Barcelona, Spain

[2] ICREA, Barcelona, Spain

[3] Oak Ridge Natl Lab, Oak Ridge, TN USA

[4] 'Kurchatov Inst, Natl Res Ctr, Moscow, Russia

[5] Moscow Inst Phys & Technol, Dolgoprudnyi, Russia

[6] Natl Res Nucl Univ MEPhI, Moscow, Russia

[7] UKAEA, Culham Ctr Fus Energy, Abingdon, England

来源：

NUCLEAR FUSION | 2024年 / 64卷 / 03期

关键词：

Alfven cascades; reversed-shear Alfven eigenmodes; RSAE; TJ-II; ALFVEN EIGENMODES; CASCADES;

D O I：

10.1088/1741-4326/ad1c93

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Alfvenic activity has been observed in the TJ-II stellarator which resembles the frequency sweeping demonstrated by Alfven cascade modes in tokamaks. A numerical validation study was conducted using a reduced magnetohydrodynamic (MHD) model to show that such modes could only have been observed in discharges where the rotational transform profile was non-monotonic. During experiments, coil current was varied which resulted in shifting of the minimum value of the rotational transform profile. To mimic this effect, we study the Alfvenic activity predicted by the reduced MHD model for a set of input rotational transform profiles with varying minima. A mode is found whose toroidal and poloidal mode numbers match those predicted in experiments which sweeps downward/upward in frequency as the minimum value of the rotational transform profile is increased/decreased. The results serve as a demonstration of the validity and utility of MHD spectroscopy.

引用

页数：12

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