Title :
Calculation of HOMs in TESLA-cavities using the coupled S-parameter calculation method
Author :
Rothemund, K. ; Glock, H.-W. ; van Rienen, U.
Author_Institution :
Inst. fur Allgemeine Elektrotechnik, Rostock Univ., Germany
Abstract :
The calculation of electromagnetic fields in accelerating structures is normally done by dedicated numerical solvers such as MAFIA. Even if components like cavities are of cylindrical symmetry, full 3D modelling is required in order to consider the effects of power- or HOM-couplers. This implies a numerical effort significantly higher than the separate treatment of parts with and without rotational symmetry. Therefore we have developed a method called coupled S-parameter calculation (CSC) which is based on a scattering parameter description. It uses S-parameters of the components found with field solving codes utilising any component´s symmetry or repetition of subsections. In the paper we present a parameter variations within a TESLA-9-cell-cavity with couplers and in a 4-cavity-chain in order to demonstrate the capabilities of CSC
Keywords :
accelerator cavities; cyclotrons; proton accelerators; 3D modelling; 4-cavity-chain; 9-cell-cavity; HOM; TESLA-cavities; accelerating structures; coupled S-parameter calculation method; cylindrical symmetry; electromagnetic fields; higher order modes; scattering parameter description; Acceleration; Couplers; Electromagnetic fields; Electromagnetic scattering; Equations; Feedback; Particle beams; Particle scattering; Scattering parameters; Zinc;
Conference_Titel :
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001
Conference_Location :
Chicago, IL
Print_ISBN :
0-7803-7191-7
DOI :
10.1109/PAC.2001.988021
