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Description
Dipole magnet vacuum chambers are among the critical and costly components of rapid-cycling accelerator facilities. Alternative
approaches to traditional ceramic chambers have been explored for the implementation of fast-ramping dipole-magnet vacuum chambers,
including thin-wall metallic beam pipe chambers strengthened with transverse ribs. Here, we report a novel 3D-printed titanium alloy
cage inside the thin-wall vacuum chamber. Because the beam impedance aspects are highly important for beam stability, comprehensive
studies were undertaken to characterize the impedance of the 3D-printed titanium alloy cage inside thin-wall vacuum chamber. The beam
coupling impedance of the new thin-wall vacuum chamber were studied numerically. Strategies for further reducing the beam-coupling
impedance were explored. In addition, impedance bench measurements using the “half wavelength” resonant method were conducted to
identify the longitudinal and transverse impedance of this thin-wall vacuum chamber prototype experimentally. The simulated and
measured results for the impedance were consistent. This novel thin-wall vacuum chamber structure has been installed in the BRing.
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