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In given article preliminary results of the research of the electronmultiplication in MPGD are presented at a high level of alpha-particlesbackground. This work has expanded borders of understanding of the streamermode nature. It is seen as a complex from electrostatic and electromagneticinteractions which begin with appearance of the precursor in plasma state. Inan inter-electrode gap the plasma oscillations occur, accompanied bylongitudinal elastic waves of ionization, which can reach the cathode surfacewith induced negative charge. With the release of this charge due to previouslyestablished conducting channel there is a strong current pulse, accompanied bythe emission due to recombination of positive and negative ions and a thin cordor streamer derive.  In the aim of the MPGD protection from the spark breakdown at a high level ofthe alpha-particle background the next gas composition from a buffer, coolingand electronegative components are offered: 70% He +28% CF4 +2% SF6.

Features of the gas discharge in the narrow gap micro-pattern gas detectors (MPGD) at a high level of alpha-particles background