Development of the ITEP 27 MHz heavy ion RFQ

A 27 MHz RFQ is presently under development and construction at ITEP, Moscow. It is based on a 90/spl deg/-apart-stem geometry ("ring-connected RFQ") and its parameters have been chosen to accelerate ions with charge to mass ratio of 1/60 to energies of 110 keV/u. It can also be considered as a prototype for a new 10 MHz RFQ, to be used as the initial part of a heavy ion accelerator for inertial fusion. In this paper the 27 MHz RFQ status is presented and some simulations of RF efficiency and field distribution, carried out with MAFIA codes, are given for the 10 MHz resonant structure.