guest ::
| Home > Publications database > Scattering parameters of the 3.9 GHz accelerating module in a free-electron laser linac: a rigorous comparison between simulations and measurements |
| Home > Publications database > Scattering parameters of the 3.9 GHz accelerating module in a free-electron laser linac: a rigorous comparison between simulations and measurements |
| Journal Article | PUBDB-2014-04145 |
; ; ; ; ; ;
2014
Soc.
[S.l.]
This record in other databases: 
Please use a persistent id in citations: doi:10.1103/PhysRevSTAB.17.022003
Abstract: This article presents a comparison between measured and simulated scattering parameters in a widefrequency interval for the third harmonic accelerating module ACC39 in the linear accelerator FLASH,located at DESY in Hamburg/Germany. ACC39 is a cryomodule housing four superconducting 3.9 GHzaccelerating cavities. Due to the special shape of the cavities (in particular its end cells and the beam pipes)in ACC39, the electromagnetic field in the module is, in many frequency ranges, coupled from one cavity tothe next. Therefore, the scattering parameters are determined by the entire string and not solely by theindividual cavities. This makes the determination of the scattering properties demanding. As far as theauthors can determine, this paper shows for the first time a direct comparison between state-of-the-artsimulations and measurements of rf properties of long, complex, and asymmetric structures over a widefrequency band. Taking into account the complexity of the system and various geometrical unknowns, theagreement between experimental measurements and simulations is remarkably good for several distinctmeasurements, although a variety of effects (e.g. cavity deviations from the ideal shape or interactions withnot modeled parts of the structure) is not considered in the computer simulation. After a short introduction,the paper provides detailed descriptions of simulations and experimental measurements performed at themodule. In this context, the estimation of the cable properties is discussed as well. As a central part of thearticle, the comparison between measured and simulated transmission spectra and quality factors ispresented. This study represents one of the first detailed comparisons between simulations andmeasurements for a coupled accelerator cavity system.
; 
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz
; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
