Speaker
Description
This work investigates AISI 1020 low-carbon steel as an alternative material for extreme-high vacuum (XHV) chambers in spin-polarized electron sources, addressing a critical limitation in high-current applications. We compare bare and magnetite-coated steel chambers to determine optimal surface conditions for accelerator applications. Our findings reveal that bare steel, following appropriate thermal conditioning, achieves remarkable hydrogen outgassing rates of 9.6×10⁻¹⁶ Torr·L/s·cm² - approximately 25 times better than magnetite-coated steel. This exceptional performance suggests that properly conditioned low-carbon steel chambers could enable sustained milliampere-level beam operation for applications such as PEPPo-style polarized positron sources, where ion bombardment currently limits charge lifetime. MolFlow+ simulations calibrated with our measurements demonstrate that thermally-conditioned bare steel chambers contribute only 3% to total system pressure, with auxiliary components becoming the limiting factor. These results offer practical guidance for vacuum system design in next-generation polarized electron sources requiring XHV conditions to overcome current beam intensity limitations.
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