Speaker
Description
Particle accelerators are continuously advancing toward high repetition rates, aiming to provide higher energy and beam intensity for frontier research across multiple disciplines, including nuclear physics and life sciences. However, the increase in repetition rate intensifies the eddy current effects induced by high-frequency magnetic fields in the vacuum chamber walls, becoming a critical bottleneck limiting accelerator performance improvement. Currently, aluminum oxide ceramic vacuum chambers are widely adopted; yet ceramics suffer from structural instability under high-temperature operating conditions, resulting in insufficient engineering reliability. Polyetheretherketone (PEEK) exhibits promising potential as a novel bulk material for magnetic component vacuum chambers due to its excellent mechanical strength, thermal resistance, chemical stability, and radiation tolerance. This work systematically investigated the outgassing rates of PEEK 30% CF (carbon fiber-reinforced) samples with thicknesses ranging from 4 to 12 mm, revealing that the outgassing rate increases with thickness. Furthermore, an extrusion-fabricated PEEK vacuum chamber prototype—600 mm in length and 100 mm in inner diameter—was developed. A Cu film approximately 2 μm thick was deposited on the inner surface of the prototype via magnetron sputtering. After baking at 120 °C, the coated prototype achieved an ultimate pressure of 3.2×10-8 mbar, demonstrating favorable vacuum performance.
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