Analysis of the end regions of the CERN lead-ion 4-rod RFQ

Author

Andreev, V.A. ; Lombardi, A. ; Parisi, G. ; Vretenar, M.

Author_Institution

ITEP, Moscow, Russia

fYear

1993

fDate

17-20 May 1993

Firstpage

3121

Abstract

A 4-rod-like Radio Frequency Quadrupole for the new CERN lead-ion injector will be built at the Laboratori Nazionali di Legnaro, Italy. By means of 3D simulations with MAFIA codes and measurements on a cold model, an asymmetry was found in the gap between the end plate and electrodes, yielding a non-zero longitudinal component E_z on the axis of the RFQ and therefore a potential barrier in the gap. In this paper an explanation is given for this fact and possible solutions are proposed for end cell tuning, which allow to eliminate the undesirable E_x component and also to obtain good inter-electrode voltage distribution along the structure. Results of MAFIA calculations and cold model measurements are shown

Keywords

cavity resonators; digital simulation; electric fields; electrical engineering computing; ion accelerators; CERN lead-ion 4-rod RFQ; MAFIA code; electric field; end cell tuning; end regions; inter-electrode voltage distribution; Acceleration; Capacitance; Electrodes; Inductance; Laboratories; Magnetic field measurement; Radio frequency; Structural rods; Tuning; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.309573

Filename

309573