Stability analysis of TJ-II stellarator NBI driven Alfvén eigenmodes in ECRH and ECCD experiments

A. Cappa; J. Varela; D. López Bruna; E. Ascasíbar; M. Liniers; L. G. Eliseev; J. M. Fontdecaba; J. M. García-Regaña; A. González-Jerez; N. K. Kharchev; F. Medina; A. V. Melnikov; S. Mulas; M. Ochando; D. Spong; J. L. Velasco

doi:10.1088/1741-4326/abf74b

Stability analysis of TJ-II stellarator NBI driven Alfvén eigenmodes in ECRH and ECCD experiments

A. Cappa, J. Varela, D. López Bruna, E. Ascasíbar, M. Liniers, L. G. Eliseev, J. M. Fontdecaba, J. M. García-Regaña, A. González-Jerez, N. K. Kharchev, F. Medina, A. V. Melnikov, S. Mulas, M. Ochando, D. Spong, J. L. Velasco

Plasma Theory and Modeling

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

In this paper, we analyze the impact of electron cyclotron resonance heating and electron cyclotron current drive on the Alfvénic instabilities driven by neutral beam injection observed in the TJ-II stellarator. An MHD stability analysis of driven Alfvén eigenmodes compatible with the experimental plasma parameters is carried out in order to compare with the data provided by magnetic coils, radiation monitors, and heavy ion beam probes. To this end, the vacuum magnetic configuration modified by the different levels of plasma current, the thermal plasma parameters and the fast ion pressure profiles generated by the co-injected neutral beam, are entered in the FAR3d gyro-fluid code in order to follow the linear evolution of the destabilized plasma equilibrium. Linear growth rates and radial location of the dominant predicted modes coincident in frequency with the observed fluctuations are presented. Despite the uncertainties related to the estimation of the rotational transform profile, the code predictions agree within reasonable accuracy with the experimental results.

Original language	English
Article number	066019
Journal	Nuclear Fusion
Volume	61
Issue number	6
DOIs	https://doi.org/10.1088/1741-4326/abf74b
State	Published - Jun 2021

Keywords

ECCD
ECRH
linear simulations
shear Alfv en waves
stellarators

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1088/1741-4326/abf74b

Cite this

Cappa, A., Varela, J., López Bruna, D., Ascasíbar, E., Liniers, M., Eliseev, L. G., Fontdecaba, J. M., García-Regaña, J. M., González-Jerez, A., Kharchev, N. K., Medina, F., Melnikov, A. V., Mulas, S., Ochando, M., Spong, D., & Velasco, J. L. (2021). Stability analysis of TJ-II stellarator NBI driven Alfvén eigenmodes in ECRH and ECCD experiments. Nuclear Fusion, 61(6), Article 066019. https://doi.org/10.1088/1741-4326/abf74b

@article{f4162da014c04f89b63e5ee1d27ae10a,

title = "Stability analysis of TJ-II stellarator NBI driven Alfv{\'e}n eigenmodes in ECRH and ECCD experiments",

abstract = "In this paper, we analyze the impact of electron cyclotron resonance heating and electron cyclotron current drive on the Alfv{\'e}nic instabilities driven by neutral beam injection observed in the TJ-II stellarator. An MHD stability analysis of driven Alfv{\'e}n eigenmodes compatible with the experimental plasma parameters is carried out in order to compare with the data provided by magnetic coils, radiation monitors, and heavy ion beam probes. To this end, the vacuum magnetic configuration modified by the different levels of plasma current, the thermal plasma parameters and the fast ion pressure profiles generated by the co-injected neutral beam, are entered in the FAR3d gyro-fluid code in order to follow the linear evolution of the destabilized plasma equilibrium. Linear growth rates and radial location of the dominant predicted modes coincident in frequency with the observed fluctuations are presented. Despite the uncertainties related to the estimation of the rotational transform profile, the code predictions agree within reasonable accuracy with the experimental results.",

keywords = "ECCD, ECRH, linear simulations, shear Alfv en waves, stellarators",

author = "A. Cappa and J. Varela and {L{\'o}pez Bruna}, D. and E. Ascas{\'i}bar and M. Liniers and Eliseev, {L. G.} and Fontdecaba, {J. M.} and Garc{\'i}a-Rega{\~n}a, {J. M.} and A. Gonz{\'a}lez-Jerez and Kharchev, {N. K.} and F. Medina and Melnikov, {A. V.} and S. Mulas and M. Ochando and D. Spong and Velasco, {J. L.}",

note = "Publisher Copyright: {\textcopyright} EURATOM 2021.",

year = "2021",

month = jun,

doi = "10.1088/1741-4326/abf74b",

language = "English",

volume = "61",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "6",

}

Cappa, A, Varela, J, López Bruna, D, Ascasíbar, E, Liniers, M, Eliseev, LG, Fontdecaba, JM, García-Regaña, JM, González-Jerez, A, Kharchev, NK, Medina, F, Melnikov, AV, Mulas, S, Ochando, M, Spong, D & Velasco, JL 2021, 'Stability analysis of TJ-II stellarator NBI driven Alfvén eigenmodes in ECRH and ECCD experiments', Nuclear Fusion, vol. 61, no. 6, 066019. https://doi.org/10.1088/1741-4326/abf74b

TY - JOUR

T1 - Stability analysis of TJ-II stellarator NBI driven Alfvén eigenmodes in ECRH and ECCD experiments

AU - Cappa, A.

AU - Varela, J.

AU - López Bruna, D.

AU - Ascasíbar, E.

AU - Liniers, M.

AU - Eliseev, L. G.

AU - Fontdecaba, J. M.

AU - García-Regaña, J. M.

AU - González-Jerez, A.

AU - Kharchev, N. K.

AU - Medina, F.

AU - Melnikov, A. V.

AU - Mulas, S.

AU - Ochando, M.

AU - Spong, D.

AU - Velasco, J. L.

PY - 2021/6

Y1 - 2021/6

N2 - In this paper, we analyze the impact of electron cyclotron resonance heating and electron cyclotron current drive on the Alfvénic instabilities driven by neutral beam injection observed in the TJ-II stellarator. An MHD stability analysis of driven Alfvén eigenmodes compatible with the experimental plasma parameters is carried out in order to compare with the data provided by magnetic coils, radiation monitors, and heavy ion beam probes. To this end, the vacuum magnetic configuration modified by the different levels of plasma current, the thermal plasma parameters and the fast ion pressure profiles generated by the co-injected neutral beam, are entered in the FAR3d gyro-fluid code in order to follow the linear evolution of the destabilized plasma equilibrium. Linear growth rates and radial location of the dominant predicted modes coincident in frequency with the observed fluctuations are presented. Despite the uncertainties related to the estimation of the rotational transform profile, the code predictions agree within reasonable accuracy with the experimental results.

AB - In this paper, we analyze the impact of electron cyclotron resonance heating and electron cyclotron current drive on the Alfvénic instabilities driven by neutral beam injection observed in the TJ-II stellarator. An MHD stability analysis of driven Alfvén eigenmodes compatible with the experimental plasma parameters is carried out in order to compare with the data provided by magnetic coils, radiation monitors, and heavy ion beam probes. To this end, the vacuum magnetic configuration modified by the different levels of plasma current, the thermal plasma parameters and the fast ion pressure profiles generated by the co-injected neutral beam, are entered in the FAR3d gyro-fluid code in order to follow the linear evolution of the destabilized plasma equilibrium. Linear growth rates and radial location of the dominant predicted modes coincident in frequency with the observed fluctuations are presented. Despite the uncertainties related to the estimation of the rotational transform profile, the code predictions agree within reasonable accuracy with the experimental results.

KW - ECCD

KW - ECRH

KW - linear simulations

KW - shear Alfv en waves

KW - stellarators

UR - http://www.scopus.com/inward/record.url?scp=85106856447&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/abf74b

DO - 10.1088/1741-4326/abf74b

M3 - Article

AN - SCOPUS:85106856447

SN - 0029-5515

VL - 61

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 6

M1 - 066019

ER -

Stability analysis of TJ-II stellarator NBI driven Alfvén eigenmodes in ECRH and ECCD experiments

Abstract

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this