Investigations of the wideband spectrum of higher order modes measured on tesla-style cavities at the FLASH LINAC

Author

Molloy, S. ; Adolphsen, C. ; Bane, K. ; Frisch, J. ; Li, Z. ; May, J. ; McCormick, D. ; Smith, T. ; Baboi, N. ; Eddy, N. ; Piccoli, L. ; Rechenmacher, R. ; Jones, R.

Author_Institution

SLAC, Menlo Park

fYear

2007

fDate

25-29 June 2007

Firstpage

3100

Lastpage

3102

Abstract

Higher Order Modes (HOMs) excited by the passage of the beam through an accelerating cavity depend on the properties of both the cavity and the beam. It is possible, therefore, to draw conclusions on the inner geometry of the cavities based on observations of the properties of the HOM spectrum. A data acquisition system based on two 20 GS/s, 6 GHz scopes has been set up at the FLASH facility, DESY, in order to measure a significant fraction of the HOM spectrum predicted to be generated by the TESLA cavities used for the acceleration of its beam. The HOMs from a particular cavity at FLASH were measured under a range of known beam conditions. The dipole modes have been identified in the data. 3D simulations of different manufacturing errors have been made, and it has been shown that these simulations can predict the measured modes.

Keywords

accelerator cavities; data acquisition; electron accelerators; electron beams; linear accelerators; particle beam bunching; physics computing; 3D simulations; DESY; FLASH facility; HOM spectrum; TESLA cavities; accelerating cavity; data acquisition system; electron beam; electron bunches; geometry; higher order modes; linac; wideband spectrum; Acceleration; Accelerometers; Data acquisition; Geometry; Linear particle accelerator; Particle beams; Particle measurements; Predictive models; Virtual manufacturing; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2007. PAC. IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

978-1-4244-0916-7

Type

conf

DOI

10.1109/PAC.2007.4440681

Filename

4440681