Title :
Microwave characterization of the waveguide BPM
Author :
Kamps, T. ; Lorenz, R. ; DeSantis, S.
Author_Institution :
DESY, Zeuthen, Germany
Abstract :
For electron beam orbit observation at the TESLA Test Facility FEL one undulator module will be equipped with ten waveguide-type beam position monitors having a design frequency of 12 GHz. Since the operation of this waveguide BPM is related to microwave concepts, a precise characterization of its microwave behaviour is necessary to describe and optimize the system performance. The purpose of this paper is to summarize the theory, different simulations and measurements of the device. Calculations and MAFIA simulations are presented for the coupling into the ridged waveguide as well as for the design of the waveguide-to-coax transition. Beside that the resonant frequencies of trapped modes inside a waveguide are estimated. Finally, back reactions on the electron beam in terms of wakefields are estimated by numerical simulations and by a simple analytical model
Keywords :
electron accelerators; free electron lasers; linear accelerators; particle beam diagnostics; ridge waveguides; wigglers; 12 GHz; MAFIA simulations; TESLA Test Facility FEL; electron beam orbit observation; microwave behaviour; microwave characterization; microwave concepts; resonant frequencies; ridged waveguide; trapped modes; undulator module; wakefields; waveguide-to-coax transition; waveguide-type beam position monitors; Electron beams; Electron traps; Extraterrestrial measurements; Frequency estimation; Microwave devices; Resonant frequency; System performance; Test facilities; Undulators; Waveguide transitions;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.794377
