Beam dynamics enhancement due to accelerating field symmetrization in the BNL/SLAC/UCLA 1.6 cell S-band photocathode RF gun

Author

Palmer, D.T. ; Wang, X.J. ; Ben-Zvi, I. ; Miller, R.H.

Author_Institution

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

Volume

3

fYear

1997

fDate

12-16 May 1997

Firstpage

2846

Abstract

A 1.6 cell photocathode S-Band gun developed by the BNL/SLAC/UCLA collaboration is now in operation at the Brookhaven Accelerator Test Facility (ATF). One of the main features of this RF gun is the symmetrization of the RF coupling iris with a identical vacuum pumping port located in the full cell. The effects of the asymmetry caused by the RF coupling iris were experimentally investigated by positioning a metallic plunger at the back wall of the vacuum port iris. The higher order modes produced were studied using electron beamlets with 8-fold symmetry. The 8-fold beamlets were produced by masking the laser beam. These experimental results indicate that the integrated electrical center and the geometrical center of the gun are within 175 μm,. which is within the laser alignment tolerance of 250 μm

Keywords

electron guns; electron sources; particle beam dynamics; BNL/SLAC/UCLA 1.6 cell S-band photocathode RF gun; RF coupling iris; accelerating field symmetrization; beam dynamics enhancement; electron beamlets; geometrical center; identical vacuum pumping port; integrated electrical center; metallic plunger; vacuum port iris; Acceleration; Cathodes; Collaboration; Electron beams; Iris; Laser modes; Life estimation; Particle beams; Radio frequency; Test facilities;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.752838

Filename

752838