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Description
Superconducting radio-frequency (SRF) electron linear accelerators provide significant advantages for high-current beam acceleration and continuous-wave (CW) operation, but their miniaturization is limited by the requirement for large liquid helium cryogenic infrastructures. A liquid helium-free Nb₃Sn SRF cavity recently developed at the Institute of Modern Physics (IMP), eliminates the need for large cryogenic systems and provides the technical basis for compact SRF e-linacs. Based on this technology, a compact prototype has been constructed and successfully commissioned with beam. A 60 kV, 250 mA, 2 μs pulsed beam is accelerated by a 650 MHz β = 0.82 SRF cavity to about 4.4 MeV with a transmission efficiency of approximately 44%. To achieve stable acceleration of a 10 mA average-current CW beam, an upgraded design has been developed to realize lossless beam transport while maintaining a compact layout and minimal system complexity. This paper presents the detailed beam dynamics design, multi-particle simulations, and error analysis of the lossless transmission scheme using TraceWin and AVAS.
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