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We demonstrate plasma discharges with extremely high temperature of bulkelectrons at the large axially symmetric magnetic mirror device GDT (BudkerInstitute, Novosibirsk). According to Thomson scattering measurements, theon-axis electron temperature averaged over several sequential shots is 660$\pm$ 50 eV with peak values exceeding 900 eV in few shots. This corresponds toat least threefold increase as compared to previous experiments both at the GDTand at other comparable machines, thus demonstrating the maximumquasi-stationary (~1 ms) electron temperature achieved in open traps. Thebreakthrough is made possible with application of sophisticated electroncyclotron resonance heating in addition to standard heating by neutral beams.The reported increase of the electron temperature along with previousexperiments, which demonstrated high-density plasma confinement with$\beta\approx$ 60%, provide a firm basis for extrapolating to fusion relevantapplications of open magnetic systems.

Achievement of a record electron temperature for a magnetic mirror device