scholarly journals CHANNELING OF POSITRONS THROUGH PERIODICALLY BENT CRYSTALS: ON THE FEASIBILITY OF CRYSTALLINE UNDULATOR AND GAMMA-LASER

2004 ◽  
Vol 13 (05) ◽  
pp. 867-916 ◽  
Author(s):  
A. V. KOROL ◽  
A. V. SOLOV'YOV ◽  
W. GREINER
Keyword(s):  
Electromagnetic Radiation ◽  
Free Electron ◽  
Free Electron Laser ◽  
Interplanar Spacing ◽  
High Energy ◽  
Literature Survey ◽  
Stimulated Emission ◽  
Spontaneous Radiation ◽  
Spectral Distributions ◽  
Bent Crystals

The electromagnetic radiation generated by ultra-relativistic positrons channeling in a crystalline undulator is discussed. The crystalline undulator is a crystal whose planes are bent periodically with the amplitude much larger than the interplanar spacing. Various conditions and criteria to be fulfilled for the crystalline undulator operation are established. Different methods of crystal bending are described. We present the results of numeric calculations of spectral distributions of the spontaneous radiation emitted in the crystalline undulator and discuss the possibility to create the stimulated emission in such a system in analogy with the free electron laser. A careful literature survey covering the formulation of all essential ideas in this field is given. Our investigation shows that the proposed mechanism provides an efficient source for high energy photons, which is worth studying experimentally.

scholarly journals Imaging at an x-ray absorption edge using free electron laser pulses for interface dynamics in high energy density systems

2017 ◽  
Vol 88 (5) ◽  
pp. 053501 ◽  
Author(s):  
M. A. Beckwith ◽  
S. Jiang ◽  
A. Schropp ◽  
A. Fernandez-Pañella ◽  
H. G. Rinderknecht ◽  
...  
Keyword(s):  
Energy Density ◽  
Absorption Edge ◽  
Free Electron ◽  
Free Electron Laser ◽  
Laser Pulses ◽  
High Energy ◽  
High Energy Density ◽  
Interface Dynamics ◽  
X Ray ◽  
X Ray Absorption

Classical free-electron lasing in an undulating electrostatic field in the axial direction

1992 ◽  
Vol 47 (2) ◽  
pp. 197-217 ◽  
Author(s):  
S. H. Kim
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Laser Field ◽  
Laser Cavity ◽  
Axial Direction ◽  
Stimulated Emission ◽  
Spectral Lines ◽  
Quantum Mechanical ◽  
Electron Mass ◽  
Fundamental Line

It is shown that the phase of the electromagnetic wave emitted through stimulated emission is intrinsically random. The insensitivity of the phase of the laser field to any disturbance in the laser cavity parameter derives from the fact that stimulated and spontaneous emissions take place concurrently at the same wave vector, the phases of spontaneous emission are mildly bunched, and the central limit theorem can be applied to the phase of the laser field. The two spectral lines observed in the Smith-Purcell free-electron laser experiment show that both classical and quantum-mechanical free-electron lasings, in which the wigglers behave as classical waves and wiggler quanta respectively, take place concurrently at different laser wavelengths in the case of the electric wiggler. It is shown that the coherence of the classical free-electron laser is achieved through modulation of the relativistic electron mass by the electric wiggler. The classical free-electron lasing is calculated using the quantum-augmented classical theory. In this, the probability of stimulated emission is first evaluated by interpreting the classically derived energy exchange between an electron and the laser field from a quantum-mechanical viewpoint. Then the laser gain is obtained from this probability by using a relationship between the two quantities derived by quantum kinetics. The wavelength of the fundamental line of classical free-electron lasing is twice the wavelength of the fundamental line of the free-electron two-quantum Stark emission, which is the quantum free-electron lasing in the electric wiggler. The gain of the classical free-electron lasing appears to scale as λ3w/γ3, where γ is the Lorentz factor of the electron beam and λw is the wavelength of the wiggler.

High-Gradient High-Energy-Gain Inverse Free Electron Laser Experiment Using a Helical Undulator

2010 ◽  
Author(s):  
P. Musumeci ◽  
M. Westfall ◽  
R. K. Li ◽  
A. Murokh ◽  
A. Tremaine ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
High Energy ◽  
Energy Gain ◽  
High Gradient ◽  
Laser Experiment

Design and simulation a high-energy free electron laser HEFEL

2019 ◽  
Author(s):  
Thair Abdulkareem Khalil Al-Aish ◽  
Rasheed Lateef Jawad ◽  
Hanady Amjed Kamil
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
High Energy

High-energy inverse free-electron-laser accelerator

1985 ◽  
Vol 32 (5) ◽  
pp. 2813-2823 ◽  
Author(s):  
E. D. Courant ◽  
C. Pellegrini ◽  
W. Zakowicz
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
High Energy ◽  
Laser Accelerator

Spontaneous radiation of an electron beam in a free‐electron laser with a quadrupole wiggler

1986 ◽  
Vol 60 (5) ◽  
pp. 1584-1590 ◽  
Author(s):  
B. Levush ◽  
T. M. Antonsen ◽  
W. M. Manheimer
Keyword(s):  
Electron Beam ◽  
Free Electron ◽  
Free Electron Laser ◽  
Spontaneous Radiation
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