Measurement of the non-thermal bremsstrahlung emission between 20 and 7000keV in the HT-7 Tokamak

AbstractRadio thermal bremsstrahlung emission has now been detected at centimeter wavelengths from about thirty symbiotic stars. These data combined with optical and IR data show that the radio emission in most systems may be understood in terms of the ionization of part of the wind of a red giant by a hot companion. The radio properties of symbiotic stars are reviewed and the agreement with and the limitations of this picture are examined.

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A Possible Connection Between the Diffuse X-Ray Background and Large Scale Structures in the Universe

Symposium - International Astronomical Union ◽

10.1017/s0074180900136691 ◽

1988 ◽

Vol 130 ◽

pp. 540-540

Author(s):

Ruth A. Daly

Keyword(s):

Emission Spectrum ◽

Large Scale ◽

X Ray ◽

Large Scale Structures ◽

Bremsstrahlung Emission ◽

Scale Structures ◽

X Ray Background ◽

The Universe ◽

Thermal Bremsstrahlung

The diffuse x-ray background extends from about five to 200 keV. The spectrum is very well fit by a thermal bremsstrahlung emission spectrum characterized by a temperature of about (25–40)(l+z) keV, where z is the redshift at which the emission is produced.

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RELATIVISTIC NON-THERMAL BREMSSTRAHLUNG RADIATION

International Journal of Modern Physics A ◽

10.1142/s0217751x13501418 ◽

2013 ◽

Vol 28 (29) ◽

pp. 1350141 ◽

Cited By ~ 1

Author(s):

VLADIMIR ZEKOVIĆ ◽

BOJAN ARBUTINA ◽

ALEKSANDRA DOBARDŽIĆ ◽

MARKO Z. PAVLOVIĆ

Keyword(s):

Electron Scattering ◽

Relativistic Effects ◽

Scattered Photon ◽

Relativistic Electrons ◽

Ion Scattering ◽

Bremsstrahlung Radiation ◽

Significant Component ◽

Bremsstrahlung Emission ◽

Relativistic Kinetic Energy ◽

Thermal Bremsstrahlung

By applying a method of virtual quanta we derive formulae for relativistic non-thermal bremsstrahlung radiation from relativistic electrons as well as from protons and heavier particles with power-law momentum distribution N(p)dp = k p-qdp. We show that emission which originates from an electron scattering on an ion, represents the most significant component of relativistic non-thermal bremsstrahlung. Radiation from an ion scattering on electron, known as inverse bremsstrahlung, is shown to be negligible in overall non-thermal bremsstrahlung emission. These results arise from theory refinement, where we introduce the dependence of relativistic kinetic energy of an incident particle, upon the energy of scattered photon. In part, it is also a consequence of a different mass of particles and relativistic effects.

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X-RAY BREMSSTRAHLUNG EMISSION DUE TO PLASMA SUPERTHERMAL ELECTRONS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1987961 ◽

1987 ◽

Vol 48 (C9) ◽

pp. C9-355-C9-358

Author(s):

M. LAMOUREUX ◽

R. H. PRATT ◽

L. JACQUET

Keyword(s):

Superthermal Electrons ◽

X Ray ◽

Bremsstrahlung Emission

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Control of quantum electrodynamical processes by shaping electron wavepackets

Nature Communications ◽

10.1038/s41467-021-21367-1 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Liang Jie Wong ◽

Nicholas Rivera ◽

Chitraang Murdia ◽

Thomas Christensen ◽

John D. Joannopoulos ◽

...

Keyword(s):

Free Electron ◽

Spectral Characteristics ◽

Modern Science ◽

Optical Excitation ◽

Field Theories ◽

Photon Scattering ◽

Precise Control ◽

Bremsstrahlung Emission ◽

Superposition States ◽

Electron Photon

AbstractFundamental quantum electrodynamical (QED) processes, such as spontaneous emission and electron-photon scattering, encompass phenomena that underlie much of modern science and technology. Conventionally, calculations in QED and other field theories treat incoming particles as single-momentum states, omitting the possibility that coherent superposition states, i.e., shaped wavepackets, can alter fundamental scattering processes. Here, we show that free electron waveshaping can be used to design interferences between two or more pathways in a QED process, enabling precise control over the rate of that process. As an example, we show that free electron waveshaping modifies both spatial and spectral characteristics of bremsstrahlung emission, leading for instance to enhancements in directionality and monochromaticity. The ability to tailor general QED processes opens up additional avenues of control in phenomena ranging from optical excitation (e.g., plasmon and phonon emission) in electron microscopy to free electron lasing in the quantum regime.

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