Design of 57.5 MHz CW RFQ structure for the Rare Isotope Accelarator Facility |
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Authors: | P N Ostroumov A A Kolomiets D A Kashinsky S A Minaev V I Pershin T E Tretyakova S G Yaramishev |
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Institution: | (1) Physics Division, Argonne National Laboratory, 9700 S. Cass Avenue, 60439 Argonne, IL, USA;(2) Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia;(3) Present address: Institute of Theoretical and Experimental Physics, Moscow |
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Abstract: | 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. |
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Keywords: | RFQ RIA |
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