Rocket Observation of sub‐relativistic electrons in the quiet dayside auroral ionosphere

2021 ◽  
Author(s):  
T. Namekawa ◽  
T. Mitani ◽  
K. Asamura ◽  
Y. Miyoshi ◽  
K. Hosokawa ◽  
...  
Keyword(s):  
Relativistic Electrons ◽  
Auroral Ionosphere

Rocket Observation of sub-relativistic electrons in the quiet dayside auroral ionosphere

2020 ◽  
Author(s):  
Taku Namekawa ◽  
Takefumi Mitani ◽  
Kazushi Asamura ◽  
Yoshizumi Miyoshi ◽  
Keisuke Hosokawa ◽  
...  
Keyword(s):  
Relativistic Electrons ◽  
Auroral Ionosphere

Instrumentation for detecting channelling radiation in the high-voltage electron microscope

1983 ◽  
Vol 41 ◽  
pp. 318-319
Author(s):  
J. H. Butler ◽  
C. J. Humphreys
Keyword(s):  
Monochromatic Light ◽  
Incident Beam ◽  
Laboratory Frame ◽  
Relativistic Electrons ◽  
Voltage Electron ◽  
Dipole Emission ◽  
Sinusoidal Oscillations ◽  
Pass Through ◽  
Incident Beam Energy ◽  
Increasing Function

Electromagnetic radiation is emitted when fast (relativistic) electrons pass through crystal targets which are oriented in a preferential (channelling) direction with respect to the incident beam. In the classical sense, the electrons perform sinusoidal oscillations as they propagate through the crystal (as illustrated in Fig. 1 for the case of planar channelling). When viewed in the electron rest frame, this motion, a result of successive Bragg reflections, gives rise to familiar dipole emission. In the laboratory frame, the radiation is seen to be of a higher energy (because of the Doppler shift) and is also compressed into a narrower cone of emission (due to the relativistic “searchlight” effect). The energy and yield of this monochromatic light is a continuously increasing function of the incident beam energy and, for beam energies of 1 MeV and higher, it occurs in the x-ray and γ-ray regions of the spectrum. Consequently, much interest has been expressed in regard to the use of this phenomenon as the basis for fabricating a coherent, tunable radiation source.

Radiation from relativistic electrons in a magnetic undulator

1989 ◽  
Vol 157 (3) ◽  
pp. 389 ◽  
Author(s):  
D.F. Alferov ◽  
Yu.A. Bashmakov ◽  
P.A. Cherenkov
Keyword(s):  
Relativistic Electrons ◽  
Magnetic Undulator

High resolution, single shot emittance measurement of relativistic electrons from laser-driven accelerator

2011 ◽  
Author(s):  
G. G. Manahan ◽  
E. Brunetti ◽  
R. P. Shanks ◽  
M. R. Islam ◽  
B. Ersfeld ◽  
...  
Keyword(s):  
High Resolution ◽  
Relativistic Electrons ◽  
Single Shot ◽  
Resolution Single ◽  
Emittance Measurement

scholarly journals High-sensitivity radio study of the non-thermal stellar bow shock EB27

2021 ◽  
Author(s):  
Paula Benaglia ◽  
Santiago del Palacio ◽  
Christopher Hales ◽  
Marcelo E Colazo
Keyword(s):  
Radio Emission ◽  
Massive Star ◽  
High Sensitivity ◽  
Bow Shock ◽  
Relativistic Electrons ◽  
Polarimetric Observation ◽  
Very Large Array ◽  
Thermal Radio Emission ◽  
The Magnetic Field ◽  
Linear Polarisation

Abstract We present a deep radio-polarimetric observation of the stellar bow shock EB27 associated to the massive star BD+43○3654. This is the only stellar bow shock confirmed to have non-thermal radio emission. We used the Jansky Very Large Array in S band (2–4 GHz) to test whether this synchrotron emission is polarised. The unprecedented sensitivity achieved allowed us to map even the fainter regions of the bow shock, revealing that the more diffuse emission is steeper and the bow shock brighter than previously reported. No linear polarisation is detected in the bow shock above 0.5%, although we detected polarised emission from two southern sources, probably extragalactic in nature. We modeled the intensity and morphology of the radio emission to better constrain the magnetic field and injected power in relativistic electrons. Finally, we derived a set of more precise parameters for the system EB27–BD+43○3654 using Gaia Early Data Release 3, including the spatial velocity. The new trajectory, back in time, intersects the core of the Cyg OB2 association.

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