19 research outputs found
Benchmark and combined velocity-space tomography of fast-ion D-alpha spectroscopy and collective Thomson scattering measurements
Resolving the bulk ion region of millimeter-wave collective Thomson scattering spectra at ASDEX Upgrade
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How to compute velocity-space tomographies using several fast-ion diagnostics
MeV-range velocity-space tomography from gamma-ray and neutron emission spectrometry measurements at JET
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 Îł-ray spectrometer detecting the Îł-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