An Electrical Method of Frequency Adjustment for the Frequency Stabilization System with a Duplexcavity

The power source of a LINAC is a pulsed magnetron whose oscillating frequency is controlled by a frequency stabilization system with a duplexcavity. We can adjust the oscillation frequency of the pulsed magnetron to change the energy of the electron beam of the LINAC. There are two methods to adjust the oscillation frequency: mechanical and electrical . I this paper, we shall show an electrical method which adjusts the oscillation frequency of the pulsed magnetron. A digital quasi-linear gain controller adjusts the gains of two amplifiers which amplify the correspondent signals from the cavities and changes the gains symmetrically in opposite directions. As a result, the form of the frequency discrimination characteristic curve is changed, the point of intersection of the curve at the frequency axis moves along the frequency axis, and consequently, for the operating frequency of the frequency stabilization system(FSS) therefore is changed. The result of theoretical analysis and practical measurement show that the relation between the preset control word and the value of the frequency deviation is quasi-linear.