Klystron One-dimensional Large-signal Calculation Procedures

The dissertation expounds thoroughly the one-dimension disk model of klystron. To improve the programme based on the disk model, a modified gap-field distribution is studied. The disadvantages of the original gap filed, such as coarseness, little correspondence with the structure of the cavity and so on, are successfully shun.In the classical model, analytic function, which has the character of index reduce, is taken as the gap field distribution. In this paper, AZIMUTH, which designed for the evaluation of eigenfrequencies and eigenvectors in cylindrically symmetric cavities of essentially arbitrary shapes, is used to calculate the numerical value of the filed distribution. A new method called weighted mean is adopted to deal with the data. Compared with analytic function, numerical data results a more precise distributing, especially for the klystrons which have narrow gaps and big size beams. In addition, The mathematical basis of AZIMUTH is a finite-difference method on squares, which results that the gap field distributing is closely correlated to cavity structure.In this paper, Newton interpolate is adopt so hat the disperse numerical data can be applied on the time integral programme. Compared with Lagrange which is hackneyed for us, Newton has the character of shot time, little truncation error and little EMS memory bestow.On the platform of Microsoft Developer Studio Fortran 9.0, some modules of the gap field are added to KLY6, which is in common use at primary stage of klystron design in IECAS, just like, data reading module, interpolate module, dispose module and so on.At last, examples of an S-band and a C band klystrons is calculated by disk model under field distributing of analytic value and numerical data, and the motion and output energy are also analyzed. Research has revealed that the model which uses numerical value is more precise.