Numerical Calculation Design And Experimental Tests Of Accelerator Input Couplers

The couplers of accelerator structures are important components of electron Knear.The efficient delivery of power from RF sources to accelerator structures depends crucially on the coupler cavity.The input coupler cavity is to be well matched,that is to say ,it must have proper coupIing.And it must be tuned to the synchronous frequency.In this way, we can obtain the maximum power.In the past,the decision of the coupler cavity dimensions is very difficult. We use the way of cut-and-try.It involves a sequence of experiments to determine the matching and tuning.The effort can be time-consuming and requires substantial expertise empirical expertise.So it is important to find some new ways to design coupler cavity.In this paper,we study an alternative approach by numerical calculation.At first,we introduce the fundamental principles and the basic components of the electron linear.Second,we introduce a way of coupler testing--three frequency method.And present a example of coupler testing.Third,we use numerical calculation method to simulate several accelerator structures.The HFSS code and MAFIA code is used to simulate a three-cavity accelerator structure.The two results are compared. We use HFSS code to simulate a four-cavity and eight-cavity accelerator structure.The results are compared with the tesing results of the network analytical apparatus.Finally, we present the numerical calculation of HFSS code to design accelerator coupler cavity and we give out the whole processes and results.