Power law decay of harmonic spectra in ultrarelativistic laser-plasma interactions

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3480106· OSTI ID:21432196

Boyd, T J. M. ^[1]; Ondarza-Rovira, R ^[2]

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1. Centre for Theoretical Physics, University of Essex, Colchester CO4 3SQ (United Kingdom)
2. Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, Mexico 11801, Distrito Federal (Mexico)

Particle-in-cell simulations have been used to explore the transition from the m{sup -8/3} decay in the power emitted by high harmonics to a regime for which the harmonic power P{sub m{approx}}m{sup -p}, where m denotes the harmonic number and p=5/3 or, less commonly, p=4/3. The deviation from the p=8/3 spectrum is interpreted as a consequence of the degree to which emission at the plasma frequency and its harmonics contribute to the spectrum. The research reported here explores conditions under which these deviations arise.

• OSTI ID: 21432196
• Journal Information: Physics of Plasmas, Vol. 17, Issue 8; Other Information: DOI: 10.1063/1.3480106; (c) 2010 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
DECAY
HARMONICS
PLASMA SIMULATION
RELATIVISTIC PLASMA
SPECTRA
OSCILLATIONS
PLASMA
SIMULATION