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The fast disruption of the runaway electrons-beam in a high-voltage picosecond atmospheric-discharge [G. A. Mesyats and M. I. Yalandin, IEEE Trans. Plas. Sci. 37 785 (2009)] is considered. The plasma electrostatic instabilities are proposed as a mechanism of such disruption. Strong over-voltage (more than 1 MV/cm at gas pressure 1 atm) provides an intense electrons-acceleration in the runaway regime. It is shown that neither collisions nor a static potential profile could deliberately prevent this runaway regime. Whereas, the cathodeanode bridging impossible within tens of pisoseconds. It is obtained that the characteristic times of a simplest electrostatic-instabilities build-up are consistent with the observed runaway-electrons beam-duration at the certain plasma density, which was considered as a parameter. The agreement our estimation results and the measurements [G. A. Mesyats, V. G. Shpak, S. A. Shunailov and M. I. Yalandin, Technical Phys. Lett. 34 169 (2008); Mesyats et al., ibidem. 32 18 (2006)] confirms that collective plasma processes indeed can provide the observed picosecond termination of the fast-electrons beam in a high-voltage gas-filled diode within the tens of picoseconds.

Electrostatic-Instabilities as a Source of Picosecond Termination of Runaway-Electrons Beam in High-Voltage Gas-Filled Ultra-Fast Diode