Polaritonic pulse and coherent X- and gamma rays from Compton (Thomson) backscattering

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3530599· OSTI ID:21538007

Apostol, M ^[1]; Ganciu, M ^[2]

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1. Department of Theoretical Physics, Institute of Atomic Physics, P.O. Box MG-35, Magurele-Bucharest MG-6 (Romania)
2. Laboratory of Plasma Physics, Institute of Lasers, Plasma and Radiation, P.O. Box MG-35, Magurele-Bucharest MG-6 (Romania)

The formation of polariton wave-packets created by high-intensity laser beams focused in plasmas is analyzed, and the velocity, energy, size, structure, stability, and electron content of such polaritonic pulses are characterized. It is shown that polaritonic pulses may transport trapped electrons with appreciable energies, provided the medium behaves as a rarefied classical plasma. The relativistic electron energy is related to the polariton group velocity, which is close to the velocity of light in this case. The plasma pulse is polarized, and the electron number in the pulse is estimated as being proportional to the square root of the laser intensity and the 3/2-power of the pulse size. It is shown that Compton (Thomson) backscattering by such polaritonic pulses of electrons may produce coherent X- and gamma rays, as a consequence of the quasirigidity of the electrons inside the polaritonic pulses and their relatively large number. The classical results of the Compton scattering are re-examined in this context, the energy of the scattered photons and their cross-section are analyzed, especially for backscattering, the great enhancement of the scattered flux of X- or gamma rays due to the coherence effect is highlighted and numerical estimates are given for some typical situations.

• OSTI ID: 21538007
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 1; Other Information: DOI: 10.1063/1.3530599; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BACKSCATTERING
BEAMS
COMPTON EFFECT
CROSS SECTIONS
GAMMA RADIATION
LIGHT TRANSMISSION
PHOTONS
RELATIVISTIC PLASMA
RELATIVISTIC RANGE
STABILITY
TRAPPED ELECTRONS
VELOCITY
WAVE PACKETS
X RADIATION
X-RAY SOURCES
BASIC INTERACTIONS
BOSONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
INTERACTIONS
IONIZING RADIATIONS
LEPTONS
MASSLESS PARTICLES
PLASMA
RADIATION SOURCES
RADIATIONS
SCATTERING
TRANSMISSION