Controlled fusion based on the magnetic confinement of the plasma is one of the main aims of the Eurofusion
programme. In the fusion device, the hydrogen isotopes, in nuclear reactions, will produce helium nuclei.
The products, as the ash, will be removed from the plasma in the region of the so-called divertor. Controlling the
helium to hydrogen ratio in this ‘exhaust gas’ will provide information about the efficiency of the fusion process
as well as of the efficiency of the helium removal system. One of the methods to perform this task is to study the
properties of the discharge conducted in such exhaust gas. In this paper, the applicability of the dielectric barrier
discharge (DBD) is studied. This preliminary experiment shows a great potential in applicability of this kind
of discharge. The optical as well as pulse-height spectra were studied, both revealing very promising properties.
In the optical spectrum, one can observe well separated hydrogen and helium spectral lines, with intensities of
the same order of magnitude. Moreover, in the registered spectral region, the molecular spectra are negligible.
The pulse-height spectra reveal very distinct shape in helium and hydrogen. Checking of this spectrum could
provide parallel (redundant) information about the partial pressure of helium in the magnetic confinement fusion
(MCF) device exhaust gas.
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