2022
DOI: 10.1088/1741-4326/ac84ee
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Toroidal Alfvén eigenmode stability in JET internal transport barrier afterglow experiments

Abstract: In this work, we use reduced and perturbative models to examine the stability of toroidal Alfven eigenmodes (TAEs) during the internal transport barrier (ITB) afterglow in JET experiments designed for the observation of alpha driven TAEs. We demonstrate that in JET-like conditions, it is sufficient to use an incompressible cold plasma model for the TAE to reproduce the experimental adiabatic features such as frequency and position. The core-localised modes that are predicted to be most strongly driven by min… Show more

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Cited by 10 publications
(19 citation statements)
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“…With the DTE2 campaign now completed, analysis of JET afterglow and other scenarios has just started to assess the effects of alpha particles on AE stability. Preliminary observations suggest that alpha drive is weak for the afterglow conditions with elevated q min achieved in DTE2, in qualitative agreement with the main conclusions of this work on linear AE stability (see section 4.2) as well as previous work [30]. In some discharges based on the hybrid scenario with q min 1, cf JET #99801, instabilities were observed in the frequency range compatible with AEs [53] both during and long before the afterglow phase.…”
Section: Discussionsupporting
confidence: 89%
See 1 more Smart Citation
“…With the DTE2 campaign now completed, analysis of JET afterglow and other scenarios has just started to assess the effects of alpha particles on AE stability. Preliminary observations suggest that alpha drive is weak for the afterglow conditions with elevated q min achieved in DTE2, in qualitative agreement with the main conclusions of this work on linear AE stability (see section 4.2) as well as previous work [30]. In some discharges based on the hybrid scenario with q min 1, cf JET #99801, instabilities were observed in the frequency range compatible with AEs [53] both during and long before the afterglow phase.…”
Section: Discussionsupporting
confidence: 89%
“…Given the broad radial structure extending to the edge, this type of AEs are ideally suited for detection by the JET Active Alfvén Eigenmode antenna system [27], which can provide critical information on the mode stability properties [18,[27][28][29]. In fact, recent modeling work suggests that a sufficiently broad alpha particle profile may be enough to destabilize similar modes in the coming JET DT campaign [30]. This type of modes are potentially relevant for EP losses because of the extended radial structure connecting the plasma core to the edge.…”
Section: Jet Test Case: Why Multi-species Ep Capabilities Are Neededmentioning
confidence: 99%
“…In JET NBI energy is low enough for Alfvén eigenmodes (AEs) excitation and ICRF is used for the AE studies [6]. A large variety of 80...700 kHz AEs are destabilized by fast ions in 3-ion ICRF D- 3 He JET experiments by fast D ions [7].…”
Section: Alfvén Cascade Above Tae and Localization Of Alfvén Modes In...mentioning
confidence: 99%
“…[5]) retain finite orbit and anisotropic effects. However, this method smooths over important features of the distribution function to mitigate the impact of noise on the stability calculation [6].…”
Section: Introductionmentioning
confidence: 99%