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 \(\sim \)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.
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HYADES is a commercial product of Cascade Applied Sciences,email: larsen@casinc.com.
Acknowledgements
The authors are thankful to the Head of the HP &SRPD for her consistent support during the development of the PDV. The authors are also thankful to Diwakar Singh Munda, Ritesh Sabale, Krishna Bhangre and Usha Rao of HP &SRPD for their support. The authors acknowledge the support received from Mr Gautam for fruitful discussion on fibre-optics-related work and polishing high power laser fibre tip.
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Chaurasia, S., Mohan, A., Poswal, A.K. et al. High-speed photon Doppler velocimetry for laser-driven flyer acceleration studies. Pramana - J Phys 96, 103 (2022). https://doi.org/10.1007/s12043-022-02340-z
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DOI: https://doi.org/10.1007/s12043-022-02340-z
Keywords
- Plasma diagnostics
- interferometry
- spectroscopy and imaging
- photon Doppler velocimetry
- laser-driven flyer
- laser–plasma diagnostics
- laser-driven shock waves