Diagnostic weight functions in constants-of-motion phase-space

M. Rud; D. Moseev; F. Jaulmes; K. Bogar; J. Eriksson; H. Järleblad; M. Nocente; G. Prechel; B. C.G. Reman; B. S. Schmidt; Antti Snicker; L. Stagner; A. Valentini; M. Salewski

doi:10.1088/1741-4326/ad1fac

Diagnostic weight functions in constants-of-motion phase-space

M. Rud^*, D. Moseev, F. Jaulmes, K. Bogar, J. Eriksson, H. Järleblad, M. Nocente, G. Prechel, B. C.G. Reman, B. S. Schmidt, Antti Snicker, L. Stagner, A. Valentini, M. Salewski

^*Corresponding author for this work

BA4511 Fusion energy

Research output: Contribution to journal › Article › Scientific › peer-review

5 Citations (Scopus)

Abstract

The fast-ion phase-space distribution function in axisymmetric tokamak plasmas is completely described by the three constants of motion: energy, magnetic moment and toroidal canonical angular momentum. In this work, the observable regions of constants-of-motion phase-space, given a diagnostic setup, are identified and explained using projected velocities of the fast ions along the diagnostic lines-of-sight as a proxy for several fast-ion diagnostics, such as fast-ion D α spectroscopy, collective Thomson scattering, neutron emission spectroscopy and gamma-ray spectroscopy. The observable region in constants-of-motion space is given by a position condition and a velocity condition, and the diagnostic sensitivity is given by a gyro-orbit and a drift-orbit weighting. As a practical example, 3D orbit weight functions quantifying the diagnostic sensitivity to each point in phase-space are computed and investigated for the future COMPASS-Upgrade and MAST-Upgrade tokamaks.

Original language	English
Article number	036007
Number of pages	23
Journal	Nuclear Fusion
Volume	64
Issue number	3
DOIs	https://doi.org/10.1088/1741-4326/ad1fac
Publication status	Published - Mar 2024
MoE publication type	A1 Journal article-refereed

Funding

We thank Lars-Göran Eriksson for fruitful discussions on orbit topology. This work has received support from the Niels Bohr Foundation which is a merger of The Niels Bohr Grant, The Emil Herborg Grant, The Grant of Mag.art. Marcus Lorenzen, The Ole Rømer Foundation and The Julie Marie Vinter Hansen Travel Grant. The views and opinions expressed herein do not necessarily reflect those of The Royal Danish Academy of Sciences and Letters. This work has been carried out within the framework of the EURO fusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 - EURO fusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.

Keywords

constants-of-motion phase-space
diagnostics
fast ions
weight functions

UN SDGs

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

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10.1088/1741-4326/ad1facLicence: CC BY

Cite this

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abstract = "The fast-ion phase-space distribution function in axisymmetric tokamak plasmas is completely described by the three constants of motion: energy, magnetic moment and toroidal canonical angular momentum. In this work, the observable regions of constants-of-motion phase-space, given a diagnostic setup, are identified and explained using projected velocities of the fast ions along the diagnostic lines-of-sight as a proxy for several fast-ion diagnostics, such as fast-ion D α spectroscopy, collective Thomson scattering, neutron emission spectroscopy and gamma-ray spectroscopy. The observable region in constants-of-motion space is given by a position condition and a velocity condition, and the diagnostic sensitivity is given by a gyro-orbit and a drift-orbit weighting. As a practical example, 3D orbit weight functions quantifying the diagnostic sensitivity to each point in phase-space are computed and investigated for the future COMPASS-Upgrade and MAST-Upgrade tokamaks.",

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AU - Moseev, D.

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AU - Järleblad, H.

AU - Nocente, M.

AU - Prechel, G.

AU - Reman, B. C.G.

AU - Schmidt, B. S.

AU - Snicker, Antti

AU - Stagner, L.

AU - Valentini, A.

AU - Salewski, M.

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N2 - The fast-ion phase-space distribution function in axisymmetric tokamak plasmas is completely described by the three constants of motion: energy, magnetic moment and toroidal canonical angular momentum. In this work, the observable regions of constants-of-motion phase-space, given a diagnostic setup, are identified and explained using projected velocities of the fast ions along the diagnostic lines-of-sight as a proxy for several fast-ion diagnostics, such as fast-ion D α spectroscopy, collective Thomson scattering, neutron emission spectroscopy and gamma-ray spectroscopy. The observable region in constants-of-motion space is given by a position condition and a velocity condition, and the diagnostic sensitivity is given by a gyro-orbit and a drift-orbit weighting. As a practical example, 3D orbit weight functions quantifying the diagnostic sensitivity to each point in phase-space are computed and investigated for the future COMPASS-Upgrade and MAST-Upgrade tokamaks.

AB - The fast-ion phase-space distribution function in axisymmetric tokamak plasmas is completely described by the three constants of motion: energy, magnetic moment and toroidal canonical angular momentum. In this work, the observable regions of constants-of-motion phase-space, given a diagnostic setup, are identified and explained using projected velocities of the fast ions along the diagnostic lines-of-sight as a proxy for several fast-ion diagnostics, such as fast-ion D α spectroscopy, collective Thomson scattering, neutron emission spectroscopy and gamma-ray spectroscopy. The observable region in constants-of-motion space is given by a position condition and a velocity condition, and the diagnostic sensitivity is given by a gyro-orbit and a drift-orbit weighting. As a practical example, 3D orbit weight functions quantifying the diagnostic sensitivity to each point in phase-space are computed and investigated for the future COMPASS-Upgrade and MAST-Upgrade tokamaks.

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Diagnostic weight functions in constants-of-motion phase-space

Abstract

Funding

Keywords

UN SDGs

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ECO-Fusion: Finnish Ecosystem for Industrial Fusion Technology

Cite this

Diagnostic weight functions in constants-of-motion phase-space

Abstract

Funding

Keywords

UN SDGs

Access to Document

Other files and links

Fingerprint

Projects

ECO-Fusion: Finnish Ecosystem for Industrial Fusion Technology

Cite this