scholarly journals Loss of relativistic electrons when magnetic surfaces are broken

2016 ◽  
Vol 23 (10) ◽  
pp. 102513 ◽  
Author(s):  
Allen H. Boozer ◽  
Alkesh Punjabi
Keyword(s):  
Relativistic Electrons ◽  
Magnetic Surfaces

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

Spin-sensitive electron capture into excited states as a probe to investigate magnetic surfaces

1998 ◽  
Vol 398 (1-2) ◽  
pp. 84-90 ◽  
Author(s):  
A. Närmann ◽  
M. Dirska ◽  
J. Manske ◽  
G. Lubinski ◽  
M. Schleberger ◽  
...  
Keyword(s):  
Excited States ◽  
Electron Capture ◽  
Magnetic Surfaces

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 Hamiltonian Approach to Magnetic Fields with Toroidal Surfaces

1985 ◽  
Vol 40 (10) ◽  
pp. 959-967
Author(s):  
A. Salat
Keyword(s):  
Magnetic Field ◽  
Hamiltonian System ◽  
Magnetic Fields ◽  
Constant Pressure ◽  
Time Dependent ◽  
Hamiltonian Approach ◽  
One Dimensional ◽  
Mhd Equilibrium ◽  
Magnetic Surfaces ◽  
Rotational Transform

The equivalence of magnetic field line equations to a one-dimensional time-dependent Hamiltonian system is used to construct magnetic fields with arbitrary toroidal magnetic surfaces I = const. For this purpose Hamiltonians H which together with their invariants satisfy periodicity constraints have to be known. The choice of H fixes the rotational transform η(I). Arbitrary axisymmetric fields, and nonaxisymmetric fields with constant η(I) are considered in detail.Configurations with coinciding magnetic and current density surfaces are obtained. The approach used is not well suited, however, to satisfying the additional MHD equilibrium condition of constant pressure on magnetic surfaces.

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