Microwave measurements of the BNL/SLAC/UCLA 1.6 cell photocathode RF gun

Author

Palmer, D.T. ; Miller, H. ; Winick, H. ; Wang, X.J. ; Batchelor, K. ; Woodle, M. ; Ben-zv, I.

Author_Institution

Linear Accel. Center, Stanford Univ., CA, USA

Volume

2

fYear

1995

fDate

1-5 May 1995

Firstpage

982

Abstract

The longitudinal accelerating field E_z has been measured as a function of azimuthal angle in the full cell of the cold test model for the 1.6 cell BNL/SLAC/UCLA 3 S-band RF gun using a needle rotation/frequency perturbation technique. These measurements were conducted before and after symmetrizing the full cell with a vacuum pump out port and an adjustable short. Two different waveguide to full cell coupling schemes were studied. The dipole mode of the full cell is an order of magnitude less severe before symmetrization for the θ-coupling scheme. The multi-pole contribution to the longitudinal field asymmetry are calculated using standard Fourier series techniques. The Panofsky-Wenzel theorem is used in estimating the transverse emittance due to the multipole components of E_z

Keywords

Fourier series; accelerator RF systems; electron accelerators; electron guns; electron sources; microwave measurement; particle beam diagnostics; particle sources; photocathodes; proton accelerators; storage rings; &thetas;-coupling scheme; BNL/SLAC/UCLA 1.6 cell photocathode RF gun; Fourier series; Panofsky-Wenzel theorem; S-band RF gun; adjustable short; azimuthal angle; cold test model; frequency perturbation; longitudinal accelerating field; longitudinal field asymmetry; microwave measurements; multipole components; multipole contribution; needle rotation; transverse emittance; vacuum pump out port; waveguide-full cell coupling schemes; Azimuthal angle; Cathodes; Frequency measurement; Life estimation; Microwave measurements; Needles; Perturbation methods; Radio frequency; Rotation measurement; 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.1995.505102

Filename

505102