Linear fixed-field multipass arcs for recirculating linear accelerators

Journal Article · Thu Jun 14 00:00:00 EDT 2012 · Physical Review Special Topics. Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevSTAB.15.060101· OSTI ID:1074714

Morozov, V. S.; Bogacz, S. A.; Roblin, Y. R.; Beard, K. B.

Recirculating Linear Accelerators (RLA's) provide a compact and efficient way of accelerating particle beams to medium and high energies by reusing the same linac for multiple passes. In the conventional scheme, after each pass, the different energy beams coming out of the linac are separated and directed into appropriate arcs for recirculation, with each pass requiring a separate fixed-energy arc. In this paper we present a concept of an RLA return arc based on linear combined-function magnets, in which two and potentially more consecutive passes with very different energies are transported through the same string of magnets. By adjusting the dipole and quadrupole components of the constituting linear combined-function magnets, the arc is designed to be achromatic and to have zero initial and final reference orbit offsets for all transported beam energies. We demonstrate the concept by developing a design for a droplet-shaped return arc for a dog-bone RLA capable of transporting two beam passes with momenta different by a factor of two. Finally, we present the results of tracking simulations of the two passes and lay out the path to end-to-end design and simulation of a complete dog-bone RLA.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC05-06OR23177
• OSTI ID: 1074714
• Alternate ID(s): OSTI ID: 1045208
• Report Number(s): JLAB-ACP-12-1536; DOE/OR/23177-2120; PRABFM; 060101
• Journal Information: Physical Review Special Topics. Accelerators and Beams, Journal Name: Physical Review Special Topics. Accelerators and Beams Vol. 15 Journal Issue: 6; ISSN 1098-4402
• Publisher: American Physical Society
• Country of Publication: United States
• Language: English

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