Title :
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
Abstract :
The longitudinal accelerating field Ez 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 Ez
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;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505102
