First measurements of velocity-space resolved intra-ELM fast-ion losses on the TCV tokamak

Edge Localised Modes (ELMs) induced fast-ion losses have been characterised in the energy, E, and pitch, λ = v∥/v, space using a unique Fast Ion Loss Detector (FILD) on the tokamak à configuration variable. The FILD is equipped with a 128 Avalanche Photo Diodes (APDs) camera measuring scintillator e...

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Detalles Bibliográficos
Autores: Poley-Sanjuán, J., Jansen van Vuuren, A., Galdón Quiroga, Joaquín, Mazzi, S., Podestà, M., Dreval, M.B., Duval, B. P., Fasoli, A., Karpushov, A. N., Labit, B., Kumar, U., EUROfusion Tokamak Exploitation Team, TCV Team
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:dnet:idus________::26ca94332fbed6d5777835182e8846ca
Acceso en línea:https://hdl.handle.net/11441/186015
https://doi.org/10.1088/1741-4326/adf95b
Access Level:acceso abierto
Palabra clave:Fast particles
FILD
ELMs
Microsecond velocity-space
Acceleration
Descripción
Sumario:Edge Localised Modes (ELMs) induced fast-ion losses have been characterised in the energy, E, and pitch, λ = v∥/v, space using a unique Fast Ion Loss Detector (FILD) on the tokamak à configuration variable. The FILD is equipped with a 128 Avalanche Photo Diodes (APDs) camera measuring scintillator emission with a 1 MHz bandwidth. The well-defined view lines of the APDs allow for obtaining velocity space information from the emission pattern with unprecedented temporal resolution. Making use of the enhanced FILD capabilities, ELM-induced fast-ion losses were investigated in the ITER Baseline Scenario, mimicking its shape and normalised plasma parameters. Significant fast-ion losses were observed, notably before and during the ELM crashes induced by the presence of a 2/1 MHD instability localised at the plasma’s normalised radius, ρ ∼ 0.7. The fast-ion interaction with the plasma instability is concluded to be unconnected to the presence of the ELMs. During the ELM crashes, there is an observed spread in both the fast-ion pitch and energy that reaches higher values (∼70 keV) than expected from the pre-ELM fast-ion population, generated by Neutral Beam Injection at ∼27 keV. This implies a fast-ion acceleration during the ELM’s crash. Full orbit neoclassical simulations are used to calculate the neoclassical fast-ion velocity space lost to the FILD and to quantify the neoclassical fast-ion losses.

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