Transverse impedance bench measurements in NLC/JLC accelerating structures

Author

Baboi, N. ; Bowden, G.B. ; Jones, R.M. ; Tantawi, S.G. ; Lewandowski, J.R.

Author_Institution

Stanford Linear Accelerator Center, CA, USA

Volume

2

fYear

2003

fDate

12-16 May 2003

Firstpage

1261

Abstract

The wire method is a more rapid and less costly method to measure impedances of RF components compared to methods using a beam. A setup using a single displaced wire to excite and measure transverse resonant modes in accelerating structures for the Next Linear Collider/ Japanese Linear Collider (NLC/JLC) has been built. The RF signal is coupled into and out of the structure using two matching sections with a broadband frequency from 11 to 18 GHz. Their contribution to the scattering parameter is minimized by a calibration technique. A standing wave structure has been measured. Difficulties in accurately predicting the modal loss factors were encountered related to the approximations made and to experimental issues. The measurements are presented and comparisons with simulations are made.

Keywords

S-parameters; accelerator RF systems; beam handling techniques; calibration; electric impedance; electron accelerators; linear accelerators; particle beam diagnostics; 11 to 18 GHz; NLC/JLC accelerating structures; RF components; RF signal; broadband frequency; calibration technique; modal loss factors; scattering parameter; standing wave structure; transverse impedance bench measurements; transverse resonant modes; wire method; Acceleration; Calibration; Coaxial components; Electromagnetic measurements; Frequency domain analysis; Frequency measurement; Impedance measurement; Particle beams; Radio frequency; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289672

Filename

1289672