High Optical Quality Torr Scientific Vacuum Window used on ALBA

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Located in Barcelona, ALBA is a Synchrotron Light Source producing radiation for experiments in many fields of science, www.cells.es. The quality of the radiation delivered to users depends on the quality of the electron beam and it is therefore necessary to continuously monitor the beam status in a non-invasive way. At ALBA, the visible part of the synchrotron radiation itself is used to measure distribution of electrons in the machine. The used synchrotron radiation is guided far from the machine tunnel up to an “extraction mirror”. In order to maintain the vacuum in the tunnel, the radiation routed up to the mirror is in-vacuum too. A Torr Scientific viewport is used for extracting the light. The goal this year is to measure the transverse beam size by using the interference pattern produced by the synchrotron radiation passing through a double slits aperture. The performance of this kind of experiment requires the preservation of the quality of the light. Torr Scientific therefore provided a special viewport with a flatness better than lambda/10 and a curvature better than 1 arc sec. Accelerator Division Researcher Laura Torino
said ‘the special viewport we ordered fulfills all the requirements outstandingly; even better than what we were asking. Thank you for the great job you did’. This ALBA project is sponsored by oPAC.albaVPZ

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