White beam diagnostics using X-ray back scattering from a CVD diamond vacuum window

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Abstract Collecting back-scattered X-rays from vacuum windows using a pinhole X-ray camera provides an efficient and reliable method of measuring the beam shape and position of the white synchrotron beam. In this paper we present measurements conducted at ESRF beamline ID6 which uses an in vacuum, cryogenically cooled permanent magnet undulator (CPMU18) and a traditional U32 undulator as its radiation sources allowing tests to be performed at very high power density levels that were adjusted by changing the gap of the undulators. Our measurements show that it is possible to record beam shape and beam position using a simple geometry without having to place any further items in the beam path. With our simple test setup it was possible to record beam position with an RMS noise figure of 150 nm.

Bibliographical metadata

Original languageEnglish
JournalJournal of Synchrotron Radiation
Publication statusPublished - Jan 2020