Abstract
A beam tube composed of 6063 alloy aluminum with a coextruded inner surface of 99.99% pure aluminum is proposed for the Superconducting Super Collider (SSC). It has higher electric conductivity than oxygen-free pure copper at liquid-helium temperature. Thermal desorption rate is ∼10−12 Pa l/s cm2 after 150 °C 24-h baking. Dynamic gas desorption by synchrotron radiation from the inner surface at liquid-helium temperature was measured with and without magnetic field. Magnetic field reduces the pressure rise by synchrotron radiation by one order of magnitude at liquid-helium temperature. If a pure Al clad beam tube is accepted for SSC vacuum system, vacuum components of aluminum alloy which can be operated at liquid-helium temperature are needed. Dynamic bellows, nonmagnetic feedthroughs, an all metal gate valve, a compact turbomolecular pump, an automatic welding machine, and a new type of pressure monitor along the ring have been developed.
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Schedule a callMore From: Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films
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