Abstract
A superconducting (SC) linac is expected to lead to outstanding discoveries in various scientific fields because its beam current is a few orders of magnitude larger than in a normal-conducting linac. However, the widespread use of SC linac is limited by the high construction and operation costs. To resolve this problem, we propose a continuous wave (CW) operation of a SC linac shared by electron/positron beams for effective multi-purposes utilization. A high current positron/electron beam is required for high-energy physics projects such as linear collider and muon collider while high-current and high-quality electron beams is expected to realize the next generation X-ray light sources. As an example, we discuss the injector of the International Linear Collider, an X-ray free-electron laser and an energy-recovery linac light source. We found a feasible solution for the proposed multibeam operation despite the high-quality beam requirements and complicated opertion: control of mixed beams without pulsed magnets, lower beam loss and heat load in the cavity, high stability of beam energy, and operation at high average current.
Highlights
As the surface of a superconducting (SC) accelerator cavity has an extremely small resistance, high accelerating rf fields can be applied with little heating
The long-pulse or continuous-wave operation enables us to increase beam repetition rate, and the cost performance per beam current is the highest among linear accelerators such as normal-conductivity cavities, and laser-based accelerators. This technique is expected in stateof-the-art large-scale linear accelerators for projects in high-energy particle physics, photon science, and neutron science and applications [1,2,3,4]
The beam optics of the long SC linac are optimized such that the transverse size of the positron beam remains much smaller than the iris radius of the accelerating cavity (35 mm), even during multibeam operation
Summary
As the surface of a superconducting (SC) accelerator cavity has an extremely small resistance, high accelerating rf fields can be applied with little heating. The long-pulse or continuous-wave (cw) operation enables us to increase beam repetition rate, and the cost performance per beam current is the highest among linear accelerators such as normal-conductivity cavities, and laser-based accelerators This technique is expected in stateof-the-art large-scale linear accelerators for projects in high-energy particle physics, photon science, and neutron science and applications [1,2,3,4]. Several features that are not required in these multibeam operations may be crucial in this proposed scheme These features include control of mixed beams without pulsed magnets, heat load in the superconducting cavity, high stability of beam energy, operation at high average current (larger than 10 mA), and bunch compression to sub-ps bunch length
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