Abstract
The nuclear science community considers the construction of the Rare Isotope Accelerator (RIA) facility as a top priority. The RIA includes a 1.4 GV superconducting linac for production of 400 kW cw heavy ion beams. The initial acceleration of heavy ions delivered from an electron cyclotron resonance ion source can be effectively performed by a 57.5 MHz 4-m long room temperature RFQ. The principal specifications of the RFQ are (i) formation of extremely low longitudinal emittance, (ii) stable operation over a wide range of voltage for acceleration of various ion species needed for RIA operation, and (iii) 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 the beam dynamics and electrodynamics design of the RFQ cavity, as well as some aspects of the mechanical design of the low-frequency cw RFQ.
Highlights
The initial acceleration of heavy ion beams in the driver linac of the Rare Isotope Accelerator (RIA) facility [1] will be provided by room temperature RFQ operating at 57.5 MHz
The primary scope of the RFQ is the acceleration of low longitudinal emittance dual charge state uranium beams
In order to simplify the front end of a multibeam driver linac and accommodate different ion species from the electron cyclotron resonance ion source, the RFQ must operate at a wide range of power levels
Summary
The initial acceleration of heavy ion beams in the driver linac of the Rare Isotope Accelerator (RIA) facility [1] will be provided by room temperature RFQ operating at 57.5 MHz. The primary scope of the RFQ is the acceleration of low longitudinal emittance dual charge state uranium beams. In order to simplify the front end of a multibeam driver linac and accommodate different ion species from the electron cyclotron resonance ion source, the RFQ must operate at a wide range of power levels. Several types of resonant structures have been analyzed in order to satisfy all specifications. We propose an original RFQ structure which combines the advantages of the four-vane and split-coaxial structures. Four-vane RFQs provide high shunt impedances while split-coaxial structures have extremely good mode separation
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.