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Characterization of intense ion beam energy density and beam induced pressure on the target with acoustic diagnostics
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the strip focusing diode: potential electrode (1), grounded electrode (2), Faraday cup (3), Rogowski coil (4), waveforms of accelerating voltage (5), total current in the diode (6), and ion current density (7).

Image of FIG. 2.
FIG. 2.

Schematic of the acoustic diagnostic for intense ion beams: 1-–strip target, 2-–PZT, and 3-–matching cones (to reduce reflections).

Image of FIG. 3.
FIG. 3.

Waveforms of the signal measured by PZT: Fig. 3(b) is zoomed in illustration of the PZT signal shown in Fig. 3(a).

Image of FIG. 4.
FIG. 4.

Thermal imprint of the beam on the target (a) placed behind the strip and the cross sectional distribution of the beam energy density (b) in vertical (1) and horizontal (2) cross sections. Line 3—Background temperature on the target before shot.

Image of FIG. 5.
FIG. 5.

The calibration dependence of the PZT signal amplitude on the ion energy density.

Image of FIG. 6.
FIG. 6.

The temperature distribution in copper target irradiated with ions at different times after interception with the beam.

Image of FIG. 7.
FIG. 7.

Shot-to-shot variation in the energy density for 35 shots with a 120 second time interval between shots (a), with a 10 s interval using acoustic diagnostics (b).

Image of FIG. 8.
FIG. 8.

Typical signal recorded from PZT during calibration. The ball was dropped from various drop heights of 12 mm (1), 50 mm (2), and 80 mm (3).

Image of FIG. 9.
FIG. 9.

Dependence of maximum beam generated pressure in the target on the input energy density (1). Curves 2–4 given for comparison are obtained from Refs. , and , respectively.

Image of FIG. 10.
FIG. 10.

The dependence of magnitude of the PZT signal on the ion energy density of 2.1 J/cm (1), 1.0 J/cm (2), 0.55 J/cm (3), and 0.25 J/cm (4).

Image of FIG. 11.
FIG. 11.

The comparison of the form of PZT signal (2) with that of the energy density distribution over the cross section (1) measured using infrared imaging diagnostics.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characterization of intense ion beam energy density and beam induced pressure on the target with acoustic diagnostics