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- W4384301101 abstract "In this paper, we analyze and numerically simulate mechanisms for generating directed rf radiation by a low-intensity laser pulse train (LPT) propagating in air. The LPT ionizes the air, forming a plasma filament. The ionization process relies on the background level of radioactivity which plays an important role in initiating a collisional ionization process. In our model a low-intensity LPT photoionizes background negative ions (produced by ambient ionizing radiation) and provides the seed electrons necessary to initiate collisional ionization. The intensity of the LPT is far below tunneling ionization levels. The ponderomotive forces associated with the LPT and self-fields drive plasma oscillations predominately in the radial direction. The driven radial electron currents in turn generate directed rf radiation. As the plasma density builds up on axis, the later portion of the LPT can defocus and limit the interaction length. The spectrum of the rf radiation consists of the fundamental frequency associated with the pulse separation time as well as harmonics. The rf generation mechanism is analyzed using fluid equations which incorporate, among other things, the effects of background radioactivity, photoionization, collisional ionization, ponderomotive and space-charge effects, and electron attachment--recombination processes. As an example, for a specific set of parameters, the rf spectrum and intensity are compared to experimental data." @default.
- W4384301101 created "2023-07-15" @default.
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- W4384301101 date "2023-07-14" @default.
- W4384301101 modified "2023-10-17" @default.
- W4384301101 title "Generation of rf radiation by low-intensity laser pulse trains in air" @default.
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- W4384301101 doi "https://doi.org/10.1103/physreve.108.015203" @default.
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