Schottky spectroscopy is widely used at the ESR storage ring for the diagnosis of longitudinal and transverse beam parameters. Furthermore, it plays a decisive role for the precision mass measurements of rare isotope nuclei as well as for lifetime measurements of these nuclei. These measurements are performed at low‐intensity beams with longitudinal ordering. The paper discusses theoretical preliminaries of Schottky spectra, hardware considerations and aspects of digital data analysis, especially with respect to time‐resolved measurements of very low‐intensity rare isotope beams.

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