Storage ring cavity higher-order mode dampers for the Advanced Photon Source

Author

Matthews, Paul ; Kang, Yoon ; Kustom, Robert

Author_Institution

Argonne Nat. Lab., IL, USA

Volume

3

fYear

1995

fDate

1-5 May 1995

Firstpage

1684

Abstract

Coaxial, mode selective higher-order mode dampers for the Advanced Photon Source storage ring cavities have been fabricated and tested. Two types of dampers will be employed. Electric field probe dampers are positioned in the equatorial plane of the cavity so as to not couple to the fundamental TM₀₁ accelerating mode. Additionally, two magnetic field probe dampers with quarter-wavelength stub rejection filters are positioned in the cavity equatorial plane 90 degrees apart to facilitate dipole mode damping. Both damper types use a vacuum compatible, aluminum nitride (AlN) ceramic RF absorber as the matched load. Measurements were made to optimize the frequency response of the tapered absorber. The design eliminates the need for a ceramic vacuum window

Keywords

accelerator RF systems; accelerator cavities; damping; electron accelerators; particle beam stability; storage rings; Advanced Photon Source; AlN ceramic RF absorber; cavity equatorial plane; coaxial mode selective higher-order mode dampers; design; dipole mode damping; electric field probe dampers; equatorial plane; frequency response; fundamental TM₀₁ accelerating mode; magnetic field probe dampers; matched load; quarter-wavelength stub rejection filters; storage ring cavities; tapered absorber; Acceleration; Ceramics; Coaxial components; Damping; Magnetic field measurement; Magnetic separation; Probes; Shock absorbers; Storage rings; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505327

Filename

505327