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Spatiotemporal dynamics of underwater conical shock wave focusing

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The paper presents an experimental study on spatiotemporal dynamics of conical shock waves focusing in water. A multichannel pulsed electrohydraulic discharge source with a cylindrical ceramic-coated electrode was used. Time-resolved visualizations revealed that cylindrical pressure waves were focused to produce conical shock wave reflection over the axis of symmetry in water. Positive and negative pressures of 372 MPa and \(-17\) MPa at the focus with 0.48 mm lateral and 22 mm axial extension (\(-6\) dB) were measured by a fiber-optic probe hydrophone. The results clearly show the propagation process leading to the high-intensity underwater shock wave. Such strong and sharp shock wave focusing offers better localization for extracorporeal lithotripsy or other non-invasive medical shock wave procedures.

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This work was supported in part by Grant No. M100431203 from the Academy of Sciences of the Czech Republic and Grant-in-Aid for Scientific Research No. 24540539 from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Correspondence to H. Hosseini.

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Communicated by M. Brouillette.

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Hoffer, P., Lukes, P., Akiyama, H. et al. Spatiotemporal dynamics of underwater conical shock wave focusing. Shock Waves 27, 685–690 (2017).

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