Doktorandprojekt

 Current PhD projects

Absorbers for microwaves

Numerical methods for analyzing circuits 

PhD student: Peter Johannesson

In this project hybrid methods that combine the method of moments and the finite element method are developed. The methods are to be used for analogue integrated circuits at frequencies ranging from 10 Ghz and up to 100 GHz. This means that skin effect as well as radiation have to be considered. Peter has developed a method that uses local basis functions based upon Legendre polynomials. He is now applying the method to different types of circuits. The results have been presented at conferences.

Design of medium beta elliptic cavities for ESS

PhD student: Gabriele Costanza

This project is done in collaboration with the European Spallation Source (ESS) in Lund and with CEA in Saclay, France. The elliptic cavities of ESS are superconducting cavities in which the protons are accelerated. The cavities are fed with an electromagnetic field with the frequency 704 MHz. The cavities have to fulfill a number of different criteria such as limited peak values of the electric and magnetic fields, constraints on the R/Q value, mechanical restrictions and limited powers of the higher order modes.

Design of drift tube linac (DTL) for ESS 

PhD student: Renato de Prisco

This project is done in collaboration with the European Spallation Source (ESS) in Lund and with Laboratori Nazionali di Legnaro, Italy. The drift tube linac is a cavity that is located in the first part of the accelerator. It consists of a long cylindrical chamber with a number of electrically isolated cylindrical electrods. The chamber is fed with an electromagnetic field with the frequency 352 MHz. The DTL is not superconducting. Also here a number of different criteria have to be fulfilled in order to obtain an efficient tube.