Title :
HOM (higher-order mode) test of the storage ring single-cell cavity with a 20-MeV e- beam for the Advanced Photon Source (APS)
Author :
Song, J. ; Kang, Y.W. ; Kustom, R.
Author_Institution :
Adv. Photon Source, Argonne Nat. Lab., IL, USA
Abstract :
To test the effectiveness of damping techniques of the APS storage ring single-cell cavity, a beamline has been designed and assembled to use the ANL Chemistry Division linac beam (20-MeV, FWHM of 20 ps). A single-cell cavity will be excited by the electron beam to investigate the effect on higher-order modes (HOMs) with and without coaxial dampers (H-loop damper, E-probe damper), and wideband aperture dampers. In order for the beam to propagate on- and off-center of the cavity, the beamline consists of two sections- a beam collimating section and a cavity measurement section- separated by two double Aluminum foil windows. RF cavity measurements were made with coupling loops and E-probes. The results are compared with both the TBCI calculations and `cold´ measurements with the bead-perturbation method
Keywords :
beam handling equipment; cavity resonators; electron accelerators; particle beam diagnostics; storage rings; 20 MeV; ANL Chemistry Division linac beam; APS; Advanced Photon Source; E-probe damper; H-loop damper; HOM test; RF cavity measurements; TBCI calculations; bead-perturbation method; beam collimating section; cavity measurement section; coaxial dampers; coupling loops; damping; double Al foil windows; electron beam; higher-order mode test; storage ring single-cell cavity; wideband aperture dampers; Apertures; Assembly; Chemistry; Coaxial components; Damping; Electron beams; Linear particle accelerator; Storage rings; Testing; Wideband;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.308685
