Extension of the energetic particle transport kick model in TRANSP to multiple fast ion species

Podestà, M.; Gorelenkova, M.; Teplukhina, A.; Bonofiglo, P. J.; Dümont, R.; Keeling, D.; Poli, F. M.; White, R. B.

doi:10.1088/1741-4326/ac99ee

Cited by 3 publications

(7 citation statements)

References 52 publications

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“…The JET DTE2 campaign is now complete, and analysis of data from the afterglow and other scenarios has started in order to study the effects of alpha particles on AE stability. Preliminary observations suggest that alpha drive is weak for the afterglow scenarios in DTE2 and no clear evidence of strong alpha-driven AEs has been observed [32], in qualitative agreement with the main conclusions of this work on linear AE stability, as well as with previous work [7,8].…”

Section: Discussionsupporting

confidence: 90%

“…It also includes the so-called kick model, a physics-based, reduced model for resonant fast ion transport by MHD instabilities, in particular, such as sawtooth and AE instabilities [12][13][14]. This model has recently been extended to deal with multiple fast ion species from NBI and fusion reactions [8]. In addition to TRANSP, the NOVA/NOVA-K [15,16] and ORBIT [17] codes are used to provide information on the mode spectrum and resonant interaction between fast ions and AE modes.…”

Section: Afterglow Analysis Of Jet Pulse #96851mentioning

confidence: 99%

“…Recent upgrades to the kick model implemented in TRANSP/NUBEAM allow us to compute the relative contribution from each EP species to the AEs' stability, as reported in [8]. The evolution of the distribution function for each species and the resulting power exchange between EPs and AEs is computed by NUBEAM.…”

Section: Ae Linear Stability In the Presence Of Fusion Alpha Particlesmentioning

confidence: 99%

“…The energy dependence of the slowing down time, with lower energy ions slowing down much faster than high energy ions, further contributes to the reduction in the energy gradient. At the same time, NB ions thermalize more quickly at larger radii, thus resulting in an increase in the radial gradient, hence in the mode's drive [8]. An example of the evolution of D and T density during the afterglow is shown in figure 15.…”

Section: Ae Linear Stability In the Presence Of Fusion Alpha Particlesmentioning

confidence: 99%

“…AE linear stability is discussed for core-and edge-localized modes in a 100-250 kHz range of frequencies and for toroidal mode numbers n = 2-6 that are most frequently observed on JET. Differences in contributions from multiple EP species to the AEs net growth rate are taken into account through the recent upgrades in the EP transport reduced kick model [8] implemented in the transport code TRANSP [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Alfvén eigenmode stability in a JET afterglow deuterium plasma and projections to deuterium–tritium plasmas

Teplukhina

Podestà

Poli

et al. 2023

Plasma Phys. Control. Fusion

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Performance of fusion devices strongly relies on good confinement of energetic particles. Therefore, investigation of energetic particle transport by magneto-hydrodynamic instabilities is one of the key aspects in development of plasma scenarios. Alfvénic instabilities in particular can lead to significant losses of alpha particles essential for plasma self-heating. A so-called afterglow scheme has been developed to study destabilization of Alfvén Eigenmodes (AEs) by alpha particles and associated energetic particle transport on the JET tokamak. In this work, the linear stability of AEs is discussed for the partial afterglow phase in a JET deuterium plasma discharge and for the full afterglow phase in a projected deuterium-tritium plasma. Thanks to recent upgrades in the tokamak transport code TRANSP, one can account for contributions of different energetic particle species to mode stability. Analysis of deuterium plasmas shows that AE growth rates are extremely sensitive to energy and distribution of fast ions. An increase in fast ion energy can lead to more unstable AEs. In the afterglow phase of projected deuterium- tritium plasmas, energetic particles mostly drive the AEs. However, drive by alpha particles is comparable to the one by beam ions and their contribution to the net growth rate might be hard to separate. According to the discussed projections, destabilization of AEs might be ineffective because the background plasma damping significantly exceeds the energetic particle drive. In this case development of an alternative plasma scenario that allows to overcome such damping would be required in future experiments.

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Section: Discussionsupporting

confidence: 90%

Section: Afterglow Analysis Of Jet Pulse #96851mentioning

confidence: 99%

Section: Ae Linear Stability In the Presence Of Fusion Alpha Particlesmentioning

confidence: 99%

Section: Ae Linear Stability In the Presence Of Fusion Alpha Particlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Alfvén eigenmode stability in a JET afterglow deuterium plasma and projections to deuterium–tritium plasmas

Teplukhina

Podestà

Poli

et al. 2023

Plasma Phys. Control. Fusion

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NSTX-U research advancing the physics of spherical tokamaks

Berkery,

Adebayo-Ige,

Al Khawaldeh

et al. 2024

Nucl. Fusion

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The objectives of NSTX-U research are to reinforce the advantages of STs while addressing the challenges. To extend confinement physics of low-A, high beta plasmas to lower collisionality levels, understanding of the transport mechanisms that set confinement performance and pedestal profiles is being advanced through gyrokinetic simulations, reduced model development, and comparison to NSTX experiment, as well as improved simulation of RF heating. To develop stable non-inductive scenarios needed for steady-state operation, various performance-limiting modes of instability were studied, including MHD, tearing modes, and energetic particle instabilities. Predictive tools were developed, covering disruptions, runaway electrons, equilibrium reconstruction, and control tools. To develop power and particle handling techniques to optimize plasma exhaust in high performance scenarios, innovative lithium-based solutions are being developed to handle the very high heat flux levels that the increased heating power and compact geometry of NSTX-U will produce, and will be seen in future STs. Predictive capabilities accounting for plasma phenomena, like edge harmonic oscillations, ELMs, and blobs, are being tested and improved. In these ways, NSTX-U researchers are advancing the physics understanding of ST plasmas to maximize the benefit that will be gained from further NSTX-U experiments and to increase confidence in projections to future devices.

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Hybrid numerical simulation on fast particle transport induced by synergistic interaction of low- and medium-frequency magnetohydrodynamic instabilities in tokamak plasma

Zhu¹,

Chen²,

Feng³

et al. 2023

Acta Phys. Sin.

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In tokamak experiments, various MHD instabilities usually co-exist and interact with fast particles. It can cause significant fast particle transport and loss, and pose damage to the first wall, leading to discharge quench in tokamak. Therefore, understanding the physical mechanism of fast particle transport caused by MHD instabilities is a crucial but urgently solved physical issue for the steady-state long pulse operation of future reactor-graded devices. Based on the experimental phenomenon of synergy between nonresonant internal kink mode and tearing mode observed on NSTX, a spherical tokamak device, this paper utilizes the global nonlinear hybrid-kinetic simulation code M3D-K to compare the characteristics of fast particle loss, transport and redistribution in the two cases: I) only non-resonant internal kink modes; II) the synergy between the non-resonant internal kink mode and tearing mode. The physical mechanism of fast particle transport, loss and redistribution caused by such synergy is studied. The results show that the synergy between the non-resonant internal kink mode and the tearing mode can significantly enhance the loss and transport of fast particles. The main reason is that such synergy can provide a radial channel for fast particles to mitigate from the plasma core to the plasma boundary accompanied with the total stochasticity of the magnetic topology. These results can help understand the physical mechanism of the transport and loss of fast particles caused by the synergy of low-frequency MHD instabilities in future fusion reactors, and provide some new ideas for finding strategies to control and mitigate the loss and transport level of fast particles in future fusion reactors.

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Extension of the energetic particle transport kick model in TRANSP to multiple fast ion species

Cited by 3 publications

References 52 publications

Alfvén eigenmode stability in a JET afterglow deuterium plasma and projections to deuterium–tritium plasmas

Alfvén eigenmode stability in a JET afterglow deuterium plasma and projections to deuterium–tritium plasmas

NSTX-U research advancing the physics of spherical tokamaks

Hybrid numerical simulation on fast particle transport induced by synergistic interaction of low- and medium-frequency magnetohydrodynamic instabilities in tokamak plasma

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