We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-space tomography at JET. Deuterium ions were accelerated into the MeV-range by third harmonic ion cyclotron resonance heating. We made measurements with three neutron emission spectrometers and a high-resolution γ-ray spectrometer detecting the γ-rays released in two reactions. The tomographic inversion based on these five spectra is in excellent agreement with numerical simulations with the ASCOT-RFOF and the SPOT-RFOF codes. The length of the measured fast-ion tail corroborates the prediction that very few particles are accelerated above 2 MeV due to the weak wave-particle interaction at higher energies.

Salewski, M., Nocente, M., Jacobsen, A., Binda, F., Cazzaniga, C., Ericsson, G., et al. (2017). MeV-range velocity-space tomography from gamma-ray and neutron emission spectrometry measurements at JET. NUCLEAR FUSION, 57(5) [10.1088/1741-4326/aa60e9].

MeV-range velocity-space tomography from gamma-ray and neutron emission spectrometry measurements at JET

NOCENTE, MASSIMO
Secondo
;
GORINI, GIUSEPPE;TARDOCCHI, MARCO
Ultimo
2017

Abstract

We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-space tomography at JET. Deuterium ions were accelerated into the MeV-range by third harmonic ion cyclotron resonance heating. We made measurements with three neutron emission spectrometers and a high-resolution γ-ray spectrometer detecting the γ-rays released in two reactions. The tomographic inversion based on these five spectra is in excellent agreement with numerical simulations with the ASCOT-RFOF and the SPOT-RFOF codes. The length of the measured fast-ion tail corroborates the prediction that very few particles are accelerated above 2 MeV due to the weak wave-particle interaction at higher energies.
Articolo in rivista - Articolo scientifico
fast ions; neutron emission spectrometry; tokamak; velocity-space tomography; γ-ray spectrometry; Nuclear and High Energy Physics; Condensed Matter Physics
English
2017
57
5
056001
reserved
Salewski, M., Nocente, M., Jacobsen, A., Binda, F., Cazzaniga, C., Ericsson, G., et al. (2017). MeV-range velocity-space tomography from gamma-ray and neutron emission spectrometry measurements at JET. NUCLEAR FUSION, 57(5) [10.1088/1741-4326/aa60e9].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/154564
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