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High precision SC cavity alignment measurements with higher order modes

Authors :
J. May
D. McCormick
N. Eddy
Josef Frisch
Nicoleta Baboi
Claire Simon
Tonee Smith
R. Paparella
Stephen Molloy
Ron Rechenmacher
O. Hensler
S. Nagaitsev
L. Piccoli
Olivier Napoly
Lyudvig Petrosyan
Marc Ross
Source :
Measurement Science and Technology. 18:2314-2319
Publication Year :
2007
Publisher :
IOP Publishing, 2007.

Abstract

Experiments at the FLASH linac at DESY have demonstrated that the higher order modes (HOMs) induced in superconducting cavities can be used to provide a variety of beam and cavity diagnostics. The centers of the cavities can be determined from the beam orbit which produces minimum power in the dipole HOM modes. The phase and amplitude of the dipole modes can be used as a high resolution beam position monitor. For most superconducting accelerators, the existing HOM couplers provide the necessary signals, and the downmix and digitizing electronics are straightforward, similar to those for a conventional BPM.

Details

ISSN :
13616501 and 09570233
Volume :
18
Database :
OpenAIRE
Journal :
Measurement Science and Technology
Accession number :
edsair.doi...........163354fcbf529904607d1da6dda52095
Full Text :
https://doi.org/10.1088/0957-0233/18/8/004