Heavy-ion-induced hydrodynamic motion in lead targetsстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:The hydrodynamic response of metal targets to volume heating by energy deposition of intense heavy-ion beams was investigated experimentally. Recent improvements in beam parameters led to a marked increase in specific deposition power: 2 (.) 10(10) Ar-40(18+) ions of 300 MeV/u focused to a spot size of 300 mum (sigma) x 540 mum (sigma) yield a specific deposition energy in solid lead of approximately 1 kJ/g in the Bragg peak, delivered within 250 ns [full width at half maximum (FWHM)]. This value allowed us for the first time to observe heavy-ion-beam-induced hydrodynamic expansion of metal volume targets. Measurements comprise expansion velocities of free surfaces of up to 290 +/- 20 m/s, surface temperatures of ejected target matter of 1600-1750 K, and pressure waves in solid metal bulk targets of 0.16 GPa maximum absolute value and 0.8 mus FWHM. The experimental results agree well with the results of a 2D hydrodynamic code. Inside the interaction zone, which can only be accessed by simulation, maximum temperatures are 2800 K and maximum pressures are 3.8 GPa.