Abstract
For reliable and stable operation of a particle accelerator, it is necessary to shield the accelerated particles inside the vacuum chambers from unwanted external stray magnetic fields. Instead of an external shield, it can be quite efficient to design a vacuum chamber itself as a magnetic shield. Therefore, we have developed a vacuum chamber with magnetic shielding properties by using the magnetic material SUS430. For this chamber not only magnetic shielding is required, but also a low outgassing rate, so that it can be used for a high intensity particle accelerator. First, we measured the outgassing rate of SUS430 using small samples with the differential pressure flow method. The results suggested that SUS430 is compatible with our low outgassing rate requirement. Then a vacuum chamber designed for installation into the synchrotron was manufactured using SUS430, and it was confirmed that the outgassing rate of the chamber is low enough.
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