Transient processes in beam masers

The steady state oscillation in the beam maser was investigated by many authors [1], [2], [6]. Now it is necessary to have information about a transient process in the masers, e.g. to investigate the approach of the amplitude and phase of the oscillation in the maser to the steady state starting from the moment when the high stress is applied to the focussing system. In the papers [3], [4], [5] the equations describing diverse processes in the beam maser were obtained. These equations are valid for the time t >> τ, (τ-is the mean time of the particle interaction with el ectromagnetic field in the cavity). However, this is not the case, we consider the situation when in the first moment there are no active molecules in the cavity. In this work the processes of the approach of the amplitude and phase to the steady state starting from the moment of molecules entering in the cavity are investigated.