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    • Keywords


      Plasma diagnostics; interferometry; spectroscopy and imaging; photon Doppler velocimetry; laserdriven flyer, laser–plasma diagnostics; laser-driven shock waves.

    • Abstract


      Photon Doppler velocimetry (PDV), a high-speed velocimetry technique, was implemented for measuring the rear-surface velocity of a laser-driven flyer. This system is compact and rugged compared to the VISAR and Fabry–Perot interferometer-based diagnostics that are often employed in laser-driven flyer experiments to measure the velocity of fast-moving surfaces. The main components of this system are an ultra-low bandwidth 2W CW laser operating at 1550 nm, an optical circulator, a fibre-optic probe, a fast photodiode (<35 ps rise time and >10 GHz bandwidth) and a high-bandwidth (8 GHz) digitizer with 20 GSa/s sampling rate. The maximum flyer velocity that can be measured by our implementation of this diagnostic is 5 km/s which is limited by the bandwidth of electronic components used in the system. Here, we also studied the optimisation of the diagnostic using different types of speakers with different in-house developed software depending on the applications. Finally,the system was used to measure the rear-surface velocity of a laser-driven flyer in the air. The maximum flyer velocity measured is ∼1.49 km/s. One-dimensional (1D) radiation-hydrodynamics simulations using the HYADES code were performed and were found to be in excellent agreement with the measured velocities.

    • Author Affiliations



      1. High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
      2. Department of Atomic Energy, Homi Bhabha National Institute, Mumbai 400 094, India
      3. Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
      4. Department of Physics, York Plasma Institute, University of York, York YO10 5DQ, UK
    • Dates

    • Supplementary Material

  • Pramana – Journal of Physics | News

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