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Diagnostic of fast-ion energy spectra and densities in magnetized plasmas
Tech Univ Denmark, Lyngby, Denmark.
Univ Milano Bicocca, Dept Phys, Milan, Italy;CNR, Ist Fis Plasma, Milan, Italy.
Tech Univ Denmark, Lyngby, Denmark.
Max Planck Inst Plasma Phys, Greifswald, Germany.
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2019 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id C05019Article in journal (Refereed) Published
Abstract [en]

The measurement of the energy spectra and densities of alpha-particles and other fast ions are part of the ITER measurement requirements, highlighting the importance of energy-resolved energetic-particle measurements for the mission of ITER. However, it has been found in recent years that the velocity-space interrogation regions of the foreseen energetic-particle diagnostics do not allow these measurements directly. We will demonstrate this for gamma-ray spectroscopy (GRS), collective Thomson scattering (CTS), neutron emission spectroscopy and fast-ion D-alpha spectroscopy by invoking energy and momentum conservation in each case, highlighting analogies and differences between the different diagnostic velocity-space sensitivities. Nevertheless, energy spectra and densities can be inferred by velocity-space tomography which we demonstrate using measurements at JET and ASDEX Upgrade. The measured energy spectra agree well with corresponding simulations. At ITER, alpha-particle energy spectra and densities can be inferred for energies larger than 1.7 MeV by velocity-space tomography based on GRS and CTS. Further, assuming isotropy of the alpha-particles in velocity space, their energy spectra and densities can be inferred by 1D inversion of spectral single-detector measurements down to about 300 keV by CTS. The alpha-particle density can also be found by fitting a model to the CTS measurements assuming the alpha-particle distribution to be an isotropic slowing-down distribution.

Place, publisher, year, edition, pages
2019. Vol. 14, article id C05019
Keywords [en]
Nuclear instruments and methods for hot plasma diagnostics, Computerized Tomography (CT), Computed Radiography (CR)
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-387606DOI: 10.1088/1748-0221/14/05/C05019ISI: 000469092700001OAI: oai:DiVA.org:uu-387606DiVA, id: diva2:1330847
Conference
5th International Conference on Frontiers in Diagnostics Technologies, OCT 03-05, 2018, Rome, ITALY
Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved

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Eriksson, Jacob

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