| Paper | Title | Page |
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THPPP051 |
The Aluminium Vacuum Chamber | |
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| There are two out-vacuum undulator lines been adopt in Shanghai Hard Free Electron Laser(SHINE), so there are Aluminium vacuum chambers in SHINE. There are 42 sets small gap out-vacuum undulators(U26), the length is 4 meters. The minimum working gap of the U26 is 7mm, the beam clear area of the vacuum chamber is 5mmX11mm, The vacuum pressure is lower than 1X10-7Torr, and the internal surface roughness of the ellipse is less than 200nm. At present, the first article has completed offline vacuum pre-installation and debugging. The minimum thickness of the U26 aluminum vacuum chamber is only 0.5mm, the gap between the U26 aluminum vacuum chamber and the magnet is only 0.5mm, the total length is 4.35 meters, there is very difficult for the U26 aluminum vacuum chamber. In order to develop this vacuum chamber, the structural design has been optimized, the tooling should be precise and the process should be optimized during processing. The internal surface roughness of the ellipse is less than 200 nm by abrasive flow polishing. At present, the development accuracy of U26 aluminum vacuum chamber reach the requirements. | ||
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