Abstract
The level of photon beam stability required in an experiment to meet measurement resolution goals depends on the experiment-specific photon phase space acceptance and the sensitivity of measurement to electron beam motion within its six-dimensional phase space. Stability time scales range from hours to microseconds, depending on experiment sampling rate, data integration period, and scan duration. Meeting these requirements at third-generation storage ring light sources can imply micron and submicroradian electron orbit stability and energy (ΔE/E) oscillation amplitudes in the part-per-million range, presenting a formidable challenge for accelerator designers. Beam stability criteria, measures taken to meet them, and achievable levels of stability in present and future light sources, are reviewed.
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