The paper deals with a magnetostrictive fast-acting actuator applied as a driving device for plasma valve designed for so called ``high intensity plasma pulses gun''. The actuator is characterized by a small displacement, but with a very short response time - below 0.1 ms. A structure with an axisymmetrical actuator energised by discharged pulses of a capacitor has been proposed. The field-circuit mathematical model of the dynamic operation of the actuator has been applied. The model includes: the equation of transient electromagnetic field in a non-linear ferromagnetic material and equation of electric circuit. The computer software has been elaborated. Results of simulation are presented.
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