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RFQ; RIA

The Rare Isotope Accelerator (RIA) facility includes a driver LINAC for production of 400 kW CW heavy-ion beams. The initial acceleration of heavy ions delivered from an ECR ion source can be effectively performed by a 57.5 MHz 4 m long RFQ. The principal specifications of the RFQ are: (1) formation of extremely low longitudinal emittance: (2) stable operation over a wide range of voltage for acceleration of various ion species needed for RIA operation; (3) simultaneous acceleration of two-charge states of uranium ions.

CW operation of an accelerating structure leads to a number of requirements for the resonators such as high shunt impedance, efficient water cooling of all parts of the resonant cavity, mechanical stability together with precise alignment, reliable rf contacts, a stable operating mode and fine tuning of the resonant frequency during operation. To satisfy these requirements a new resonant structure has been developed.

This paper discusses beam dynamics and electrodynamics design of the RFQ cavity, as well as, some aspects of the mechanical design of this low-frequency CW RFQ.

P N Ostroumov¹ A A Kolomiets^{1 2} D A Kashinsky³ S A Minaev³ V I Pershin³ T E Tretyakova³ S G Yaramishev³

1. Physics Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL - 60439, USA
2. Institute of Theoretical and Experimental Physics, Moscow
3. Institute of Theoretical and Experimental Physics, Moscow - 117259, Russia

Published

December 2002