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Gamma-ray measurements in D3He fusion plasma experiments on JET

Iliasova M.; Shevelev A.; Khilkevich E.; Kazakov Y; Kiptily V.; Nocente M.; Giacomelli L.; Craciunescu T.; Stancar Z.; Dal Molin A.; Rigamonti D.; Tardocchi M.; Doinikov D.; Gorini G.; Naidenov V.; Polunovsky I.; Gin D.

Using capabilities of the gamma-ray spectrometry, fusion born alpha-particles were studied in recent D-3He plasma experiments on JET. A substantial population of the alpha-particles was generated in the 3He-rich plasma due to the 3He(D, p)4He reaction. Fast deuterium ions of the neutral beam injection (NBI) heating were accelerated to MeV energies with three-ion scenario D-(DNBI)-3He using radio frequency waves in the ion cyclotron range of frequencies (ICRF). A high reaction rate allowed to measure the alpha-particle production rate and their spatial distribution in the plasma by detecting 16.7-MeV gamma-rays from the 3He(D, y)5 Li reaction, which is a weak branch of 3He(D, p)4He reaction. A branching ratio of gamma-ray transitions to the ground and the first excited states of 5Li was obtained. Due to the beryllium is a main impurity of JET plasmas, intensive gamma-rays from the Be-9(D, ny) 10B, Be-9(D, py) 10Be and Be-9(a, ny) C-12 reactions were observed. Exploitation of the reaction cross-sections and the Doppler shape analysis (DSA) of gamma-lines in the recorded spectra provided the possibility to reconstruct distribution functions of the confined D-ions and the fusion-born alpha-particles.

ID 466529
DOI 10.1016/j.nima.2022.166586
PRODUCT TYPE Journal Article
LAST UPDATE 2023-02-01T12:03:31Z
TITLE Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium