Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289672
