INVESTIGATION OF THERMAL AND SLOWING-DOWN ALPHA-PARTICLES ON JET USING CHARGE-EXCHANGE SPECTROSCOPY

M VONHELLERMANN*, W MANDL, HP SUMMERS, A BOILEAU, R HOEKSTRA, FJ DEHEER, J FRIELING

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

34 Citaten (Scopus)

Samenvatting

Thermal alpha particles are observed in JET during helium discharges using spectral emission in He II (n = 4 --> 3) near 4685 angstrom following charge transfer reactions along the path of the neutral deuterium heating beams. New and reappraised He2+/H charge transfer cross-sections are presented. The effects of cross-section energy dependence on temperatures, velocities and absolute densities deduced from thermal alpha particle charge exchange spectra are evaluated. The possibility of detecting fusion alpha particles produced at 3.5 MeV and slowing down by collisions with plasma electrons and ions using visible charge exchange spectroscopy is addressed. The spectral signature of slowing-down fusion alpha particles expected during the deuterium- tritium phase of JET is modelled and its identification against thermal alpha particle and background radiation is investigated.

Originele taal-2English
Pagina's (van-tot)1805-1824
Aantal pagina's20
TijdschriftPlasma Physics and Controlled Fusion
Volume33
Nummer van het tijdschrift14
StatusPublished - nov-1991

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