Design and test of a superconducting RFQ for heavy ions☆

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Abstract

A prototype SRFQ resonator optimized for a velocity of β=0.03 and a charge to mass ratio (qM) of 16 has been designed, fabricated and tested. This is a short RFQ structure (only 2βλ long) operating at 57.4 MHz. The resonator is made of copper, and a 1.5 μm thick layer of electroplated Pb-2 at.% Sn is used as the superconductor. The electrical characteristics of the resonator derived from detailed 3D numerical simulations using the MAFIA codes, and also from measurements on the actual resonator are described. The multipactoring levels could be processed away with ease. Quality factor (Q) > 1 × 108 is obtained for Ea up to 1 MV/m. Other parameters relevant to superconducting operation are also presented.

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☆

Work Supported in part by NSF Grant no. PHY-8902923.

1

Also NSLS Department, Brookhaven National Laboratory, Upton, NY 11973, USA.

2

Now at Brookhaven National Laboratory, Accelerator Development Department, Building 902B, Upton, NY 11973, USA.

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Copyright © 1993 Published by Elsevier B.V.