Doppler Spectrometry for Ultrafast Temporal Mapping of Density Dynamics in Laser-Induced Plasmas

Journal Article · Fri Sep 03 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.105002· OSTI ID:21470922

Mondal, S; Lad, Amit D; Ahmed, Saima; Narayanan, V; Pasley, J; Rajeev, P P; Robinson, A P. L.; Kumar, G Ravindra ^[1]

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1. Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Colaba, Mumbai-400005 (India)

We present high resolution measurements of the ultrafast temporal dynamics of the critical surface in moderately overdense, hot plasma by using two-color, pump-probe Doppler spectrometry. Our measurements clearly capture the initial inward motion of the plasma inside the critical surface of the pump laser which is followed by outward expansion. The measured instantaneous velocity and acceleration profiles are very well reproduced by a hybrid simulation that uses a 1D electromagnetic particle-in-cell simulation for the initial evolution and a hydrodynamics simulation for the later times. The combination of high temporal resolution and dynamic range in our measurements clearly provides quantitative unraveling of the dynamics in this important region, enabling this as a powerful technique to obtain ultrafast snapshots of plasma density and temperature profiles for providing benchmarks for simulations.

• OSTI ID: 21470922
• Journal Information: Physical Review Letters, Vol. 105, Issue 10; Other Information: DOI: 10.1103/PhysRevLett.105.105002; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATION
BENCHMARKS
COMPUTERIZED SIMULATION
DOPPLER BROADENING
EMISSION SPECTROSCOPY
HOT PLASMA
HYDRODYNAMICS
LASERS
MAPPING
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA SIMULATION
RESOLUTION
SURFACES
FLUID MECHANICS
LINE BROADENING
MECHANICS
PLASMA
SIMULATION
SPECTROSCOPY