Velocity space resolved absolute measurement of fast ion losses induced by a tearing mode in the ASDEX Upgrade tokamak

J. Galdon-Quiroga; M. Garcia-Munoz; L. Sanchis-Sanchez; M. Mantsinen; S. Fietz; V. Igochine; M. Maraschek; M. Rodriguez-Ramos; B. Sieglin; A. Snicker; G. Tardini; D. Vezinet; M. Weiland; L. G. Eriksson

doi:10.1088/1741-4326/aaa33b

Velocity space resolved absolute measurement of fast ion losses induced by a tearing mode in the ASDEX Upgrade tokamak

J. Galdon-Quiroga, M. Garcia-Munoz, L. Sanchis-Sanchez, M. Mantsinen, S. Fietz, V. Igochine, M. Maraschek, M. Rodriguez-Ramos, B. Sieglin, A. Snicker, G. Tardini, D. Vezinet, M. Weiland, L. G. Eriksson

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Abstract

Absolute flux of fast ion losses induced by tearing modes have been measured by means of fast ion loss detectors (FILD) for the first time in RF heated plasmas in the ASDEX Upgrade tokamak. Up to 30 MW m^-2 of fast ion losses are measured by FILD at 5 cm from the separatrix, consistent with infra-red camera measurements, with energies in the range of 250-500 keV and pitch angles corresponding to large trapped orbits. A resonant interaction between the fast ions in the high energy tail of the ICRF distribution and a m/n = 5/4 tearing mode leads to enhanced fast ion losses. Around % of the fast ion losses are found to be coherent with the mode and scale linearly with its amplitude, indicating the convective nature of the transport mechanism. Simulations have been carried out to estimate the contribution of the prompt losses. A good agreement is found between the simulated and the measured velocity space of the losses. The velocity space resonances that may be responsible for the enhanced fast ion losses are identified.

Original language	English
Article number	036005
Journal	Nuclear Fusion
Volume	58
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/aaa33b
Publication status	Published - 15 Jan 2018
MoE publication type	A1 Journal article-refereed

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This research was supported in part by the Spanish Ministry of Economy and Competitiveness (Grant Nos. RYC-2011-09152, FIS2015-69362-P, and ENE2012-31087).

Keywords

fast ion losses
heat loads
tearing mode

UN SDGs

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

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10.1088/1741-4326/aaa33b

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Galdon-Quiroga, J., Garcia-Munoz, M., Sanchis-Sanchez, L., Mantsinen, M., Fietz, S., Igochine, V., Maraschek, M., Rodriguez-Ramos, M., Sieglin, B., Snicker, A., Tardini, G., Vezinet, D., Weiland, M., & Eriksson, L. G. (2018). Velocity space resolved absolute measurement of fast ion losses induced by a tearing mode in the ASDEX Upgrade tokamak. Nuclear Fusion, 58(3), Article 036005. https://doi.org/10.1088/1741-4326/aaa33b

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title = "Velocity space resolved absolute measurement of fast ion losses induced by a tearing mode in the ASDEX Upgrade tokamak",

abstract = "Absolute flux of fast ion losses induced by tearing modes have been measured by means of fast ion loss detectors (FILD) for the first time in RF heated plasmas in the ASDEX Upgrade tokamak. Up to 30 MW m-2 of fast ion losses are measured by FILD at 5 cm from the separatrix, consistent with infra-red camera measurements, with energies in the range of 250-500 keV and pitch angles corresponding to large trapped orbits. A resonant interaction between the fast ions in the high energy tail of the ICRF distribution and a m/n = 5/4 tearing mode leads to enhanced fast ion losses. Around % of the fast ion losses are found to be coherent with the mode and scale linearly with its amplitude, indicating the convective nature of the transport mechanism. Simulations have been carried out to estimate the contribution of the prompt losses. A good agreement is found between the simulated and the measured velocity space of the losses. The velocity space resonances that may be responsible for the enhanced fast ion losses are identified.",

keywords = "fast ion losses, heat loads, tearing mode",

author = "J. Galdon-Quiroga and M. Garcia-Munoz and L. Sanchis-Sanchez and M. Mantsinen and S. Fietz and V. Igochine and M. Maraschek and M. Rodriguez-Ramos and B. Sieglin and A. Snicker and G. Tardini and D. Vezinet and M. Weiland and Eriksson, {L. G.}",

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Galdon-Quiroga, J, Garcia-Munoz, M, Sanchis-Sanchez, L, Mantsinen, M, Fietz, S, Igochine, V, Maraschek, M, Rodriguez-Ramos, M, Sieglin, B, Snicker, A, Tardini, G, Vezinet, D, Weiland, M & Eriksson, LG 2018, 'Velocity space resolved absolute measurement of fast ion losses induced by a tearing mode in the ASDEX Upgrade tokamak', Nuclear Fusion, vol. 58, no. 3, 036005. https://doi.org/10.1088/1741-4326/aaa33b

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AU - Galdon-Quiroga, J.

AU - Garcia-Munoz, M.

AU - Sanchis-Sanchez, L.

AU - Mantsinen, M.

AU - Fietz, S.

AU - Igochine, V.

AU - Maraschek, M.

AU - Rodriguez-Ramos, M.

AU - Sieglin, B.

AU - Snicker, A.

AU - Tardini, G.

AU - Vezinet, D.

AU - Weiland, M.

AU - Eriksson, L. G.

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N2 - Absolute flux of fast ion losses induced by tearing modes have been measured by means of fast ion loss detectors (FILD) for the first time in RF heated plasmas in the ASDEX Upgrade tokamak. Up to 30 MW m-2 of fast ion losses are measured by FILD at 5 cm from the separatrix, consistent with infra-red camera measurements, with energies in the range of 250-500 keV and pitch angles corresponding to large trapped orbits. A resonant interaction between the fast ions in the high energy tail of the ICRF distribution and a m/n = 5/4 tearing mode leads to enhanced fast ion losses. Around % of the fast ion losses are found to be coherent with the mode and scale linearly with its amplitude, indicating the convective nature of the transport mechanism. Simulations have been carried out to estimate the contribution of the prompt losses. A good agreement is found between the simulated and the measured velocity space of the losses. The velocity space resonances that may be responsible for the enhanced fast ion losses are identified.

AB - Absolute flux of fast ion losses induced by tearing modes have been measured by means of fast ion loss detectors (FILD) for the first time in RF heated plasmas in the ASDEX Upgrade tokamak. Up to 30 MW m-2 of fast ion losses are measured by FILD at 5 cm from the separatrix, consistent with infra-red camera measurements, with energies in the range of 250-500 keV and pitch angles corresponding to large trapped orbits. A resonant interaction between the fast ions in the high energy tail of the ICRF distribution and a m/n = 5/4 tearing mode leads to enhanced fast ion losses. Around % of the fast ion losses are found to be coherent with the mode and scale linearly with its amplitude, indicating the convective nature of the transport mechanism. Simulations have been carried out to estimate the contribution of the prompt losses. A good agreement is found between the simulated and the measured velocity space of the losses. The velocity space resonances that may be responsible for the enhanced fast ion losses are identified.

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Velocity space resolved absolute measurement of fast ion losses induced by a tearing mode in the ASDEX Upgrade tokamak

Abstract

Funding

Keywords

UN SDGs

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