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Current waveforms from two basic SPS pulse generators and three duty cycles. Panels (a)–(c) are for a thyristor-type pulse generator with a pulse duration of 3.3 ms (since 1989) [12, 80]. Panels (d)–(f) are for an inverter-type pulse generator (1996–1997) (courtesy of Sumitomo/SPSS, Japan).
