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Tracking ultrafast dynamics of intense shock generation and breakout at target rear

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Author(s)

  • Moniruzzaman Shaikh
  • Kamalesh Jana
  • Amit D. Lad
  • Indranuj Dey
  • Sudipta Roy
  • Deep Sarkar
  • Yash Ved
  • Alexander P L Robinson
  • John Richard Pasley
  • G. Ravindra Kumar

Department/unit(s)

Publication details

JournalPhysics of Plasmas
DateAccepted/In press - 24 Oct 2018
DatePublished (current) - 12 Nov 2018
Volume25
Number of pages5
Original languageEnglish

Abstract

We report upon the picosecond plasma dynamics at the rear surface of a thin aluminium foil (of either 5.5 um or 12 um thickness) excited by high contrast (picosecond intensity contrast of 10^10), 800 nm, femtosecond pulses at an intensity of 3 x 10^19 W/cm2. We employ ultrafast pump-probe reflectometry using a second harmonic probe (400 nm) interacting with the rear surface of the target. A rise in the probe reflectivity 30 picoseconds after the pump pulse interaction reveals the breakout of a shock wave at the target rear surface which reflects the 400 nm probe pulse. Simulations using the ZEPHYROS hybrid particle-in-cell code were performed to understand the heating of the
target under the influence of the high intensity laser pulse, and the temperature profile was then passed to the radiation-hydrodynamics simulation code HYADES in order to model the shock wave propagation in the target. A good agreement was found between the calculations and experimental results.

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