Slot-finger superconducting structure with rf focusing
Yu. Senichev, N. Vasyukhin
DOI 10.1103/PhysRevSTAB.8.070101 · Physical Review Special Topics - Accelerators and Beams
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Abstract
The linear accelerator based on a superconducting structure with a high accelerating gradient accordingly has a strong rf defocusing factor. Usually, a quadrupole or solenoid focusing system is used in such accelerators. Both of these systems complicate the linear accelerator. The quadrupoles are located outside the cavity and a transition between the cold and the warm systems is required. Therefore an additional drift space between cryostats is needed, which can cause parametric resonance in the longitudinal plane in the energy range of (3–20) MeV. In the system with the solenoid the high magnetic field can affect the superconductivity. We consider the novel superconducting H resonator based on the TE211 mode with a slot and rf finger, providing the high-intensity beam focusing in the large range of low energy of (3–50) MeV. Above 50 MeV we suggest using the slot structure with the external quadrupoles.
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