Characterization of NSLS accelerating cavities using impedance measurement techniques

Author

Hanna, S.M. ; Stefan, P.M.

Author_Institution

Nat. Synchrotron Light Source, Brookhaven Nat. Lab., Upton, NY, USA

fYear

1993

fDate

17-20 May 1993

Firstpage

895

Abstract

Impedance measurements, using a central wire to simulate the electron beam, were performed on a 52 MHz accelerating cavity at the National Synchrotron Light Source (NSLS). To damp higher-order modes (HOM) in this cavity, damping antennas have been installed. We implemented the impedance measurement technique to characterize the cavity modes up to 1 GHz and confirm the effectiveness of the damping antennas. Scattering parameters were measured using a network analyzer (HP 8510B) and values for R and Q were extracted using a new analytical technique. Our results showed good agreement with URMEL simulations and with other independent Q measurements. This technique offers a more time-effective technique for obtaining R/Q, compared with the bead-pull method

Keywords

beam handling equipment; cavity resonators; electron accelerators; storage rings; superconducting microwave devices; synchrotrons; HP 8510B; NSLS; National Synchrotron Light Source; URMEL simulation; accelerating cavities; damping antennas; higher-order mode damping; impedance measurement; network analyzer; quality factor; shunt resistance; Acceleration; Damping; Electron beams; Impedance measurement; Light sources; Performance evaluation; Q measurement; Scattering parameters; Synchrotrons; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.308738

Filename

308738