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MeV-range velocity-space tomography from gamma-ray and neutron emission spectrometry measurements at JET
- Salewski, M;
- Nocente, M;
- Jacobsen, AS;
- Binda, F;
- Cazzaniga, C;
- Ericsson, G;
- Eriksson, J;
- Gorini, G;
- Hellesen, C;
- Hjalmarsson, A;
- Kiptily, VG;
- Koskela, T;
- Korsholm, SB;
- Kurki-Suonio, T;
- Leipold, F;
- Madsen, J;
- Moseev, D;
- Nielsen, SK;
- Rasmussen, J;
- Schneider, M;
- Sharapov, SE;
- Stejner, M;
- Tardocchi, M
- et al.
Published Web Location
http://www.euro-fusionscipub.org/wp-content/uploads/WPJET1PR16_16716_submitted.pdfNo data is associated with this publication.
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.