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We present a method of beam emission spectroscopy (BES) using an atomic Li beam that is generated by means of laser blow-off for the investigation of electron density fluctuations in the edge and scrape-off layer plasmas of fusion devices. We discuss the operational limits of this technique and compare them to those of other atomic Li beam diagnostics. Furthermore, we apply this method to different Wendelstein 7-AS discharges and study the influence of the line integrated electron density anddoi:10.1088/0741-3335/46/3/005 fatcat:oqpsigzhorfxxnjpfhbnw62o44