Abstract Details
Abstracts
Author: Alessandro Cardinali
Requested Type: Poster
Submitted: 2025-01-18 10:32:40
Co-authors: B. Coppi, C. Castaldo
Contact Info:
CNR Istituto Sistemi Complessi
Corso Duca degli Abruzzi, 24
Turin, 10129
Italy
Abstract Text:
In magnetically confined fusion burning plasmas, DT as an example, the energy of the alpha particles created by the reactions is transferred to the plasma if the confinement time of the alpha particles is greater than the slowing down time of the alphas on the ions and the electrons. A process has been identified theoretically, that can be maintained spontaneously in fusion burning plasmas, which enables the transfer energy from the emitted reaction products to the reacting nuclei populations. The relevant observations of enhanced fusion reaction rates resulting from energetic neutral H-beams injection into D-plasmas [1] confirm the validity of, searching for less severe ignition conditions for burning plasmas than those commonly considered. New perspectives for fusion research can be envisioned considering that magnetically confined plasmas involve regimes where particle distributions are non-thermal and significant self-organization processes are present. Linearly coupled mode-particle interactions are found that involves reacting nuclei and reaction products leading to reactivity that are different from those evaluated for strictly Maxwellian distributions. The novel resonant mode-particle interaction associated with ballooning modes characterized by non-separable dependences on time and space variables, are shown to constitute a direct (linear) process to exchange energy between different populations. As a result it is reasonable to expect that the distributions of the reacting nuclei in phase space will not remain strictly Maxwellian and that the relevant reaction rates will be different from those evaluated for (conventional) thermal distributions.
[1] R. M. Magee, A. Necas, R. Clary et al., Nature 15, 281 (2019)
Characterization: 4.0
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