Coaxial tri-electrode plate type igniter

Abstract

The invention provides a tri-electrode plate type round table coaxial igniter, which is mainly used for a pulse plasma thruster and providing an initial induction plasma for the main discharging process of the thruster. The igniter adopts tri-electrode plate construction, two electrode plates are coaxially and parallelly arranged, and the outermost side electrode plate adopts a round table construction. A connector lug of the igniter is provided with a tri-claw elastic sheet which enables the igniter to be fixedly installed on the electrode plates of the thruster. The inside of the connector lug is connected with the igniter in an inserting mode, and an outside igniting circuit is connected with the two electrode plates inside the igniter. When the igniter discharges, under the effect of voltage between a last but one outermost layer of an anode plate and a central cathode, the surface of a semi-conductor ring between the two electrode plates discharges in a low-energy and self-excitation flash over mode, and a generated plasma induces the surface of a semi-conductor ring between an outermost layer of the cathode plate and the last but one outermost layer of the anode plate to discharge with high efficiency. The coaxial tri-electrode plate type igniter can provide the inducing plasma with high energy and high density and has good work stability. Carbon is not prone to accumulate on the surface of the semi-conductor ring, so that the igniter has long service life.

Description

technical field

[0001] The invention designs a coaxial tripolar plate type igniter used on a pulse plasma thruster to provide induced electrons for the main discharge of the thruster. Background technique

[0002] As a member of the electric propulsion family, the pulsed plasma thruster is an electromagnetic thruster that uses electromagnetic force to accelerate the plasma generated by the ablation and ionization of the working fluid to generate thrust. The biggest advantage of the pulsed plasma thruster is that it combines the supply of non-toxic propellant with the thruster body into one module, eliminating the need for complex propellant storage and supply systems. The pulsed plasma thruster has the advantages of high specific impulse, small impulse, low average power consumption, and simple structure. It is very suitable for space applications of micro-satellites and high-precision control propulsion tasks.

[0003] In the high vacuum state, the pulsed plasma thruster c...

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