Acoustic signals in copper target induced by irradiation with a low-energy high-current electron beam

The study of acoustic signals induced by the action of a low-energy high-current electron beam (LEHCEB) of microsecond duration on a copper plate is presented. The characteristic shapes of acoustic signals, their amplitude and phase-frequency structure are experimentally obtained. It was established that the acoustic signals induced as a result of the LEHCEB action consist of particular spectral components with fundamental frequencies of 6, 11, 22-24, 80, 100-120 kHz whose amplitudes increase with increasing of charge voltage. In the dependence of 80 kHz harmonic spectral component on the charge voltage, we can distinguish the following arises: (1) absence of the LEHCEB, existence of LEHCEB in (2) unstable mode and in stable mode (3) without and (4) with surface target melting. It was found that for a fixed charging voltage the amplitude and phase-frequency structure of acoustic signals is almost the same for any pulse in the series.

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