Abstract
Energy recovery linacs (ERLs) are an emerging generation of accelerators that promises to revolutionize the fields of high-energy physics and photon sciences. These accelerators combine the advantages of linear accelerators with that of storage rings, and augur the delivery of electron beams of unprecedented power and quality. The use of superconducting radio-frequency cavities converts ERLs into nearly perfect ``perpetuum mobile'' accelerators, wherein the beam is accelerated to the desired energy, used, and then yields the energy back to the rf field. However, one potential weakness of these devices is transverse beam breakup instability that could severely limit the available beam current. In this paper, I propose a novel method of suppressing these dangerous effects via a natural phenomenon in the accelerators, viz., the chromaticity of the transverse motion.
Highlights
Energy recovery linacs (ERLs, see Fig. 1) belong to a family of recirculating linacs (RLs) that accelerate a beam of charged particles multiple times in the same linear accelerator, accumulating the beam’s energy on each pass
In 1965, Tigner suggested the idea of an energy recovery linac [1]. It took some 35 years of development of superconducting radio-frequency (SRF) ERLs to reach beam currents $10 mA, and energy of few hundreds MeV. While this sufficed for the first spectacular demonstration of generating very high powerful coherent-radiation in 2000 [2,3] at the Thomas Jefferson Accelerator Facility (JLab), there now is a well-established need for ERLs with GeV-scale energy, and ampere-scale currents for fundamental and applied sciences
I have shown in this paper that using the natural chromaticity of the arcs in ERLs affords an opportunity of suppressing the beam’s transfer function, and either suppressing transverse beam breakup instability (TBBU) instability or significantly increasing allowable operating currents
Summary
Energy recovery linacs (ERLs, see Fig. 1) belong to a family of recirculating linacs (RLs) that accelerate a beam of charged particles multiple times in the same linear accelerator, accumulating the beam’s energy on each pass. In 1965, Tigner suggested the idea of an energy recovery linac [1] It took some 35 years of development of superconducting radio-frequency (SRF) ERLs to reach beam currents $10 mA, and energy of few hundreds MeV. While this sufficed for the first spectacular demonstration of generating very high powerful coherent-radiation in 2000 [2,3] at the Thomas Jefferson Accelerator Facility (JLab), there now is a well-established need for ERLs with GeV-scale energy, and ampere-scale currents for fundamental and applied sciences. The latter is the topic of this paper, wherein I describe the workings of my proposed suppression mechanism
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