Far ir picosecond pulses of coherent transition radiation

1994 ◽  
Author(s):  
Uwe Happek
Keyword(s):  
Transition Radiation ◽  
Picosecond Pulses ◽  
Coherent Transition Radiation

Spectrum of coherent transition radiation generated by a modulated electron beam

JETP Letters ◽  
2017 ◽  
Vol 106 (2) ◽  
pp. 127-130 ◽  
Author(s):  
G. A. Naumenko ◽  
A. P. Potylitsyn ◽  
P. V. Karataev ◽  
M. A. Shipulya ◽  
V. V. Bleko
Keyword(s):  
Electron Beam ◽  
Transition Radiation ◽  
Coherent Transition Radiation

scholarly journals Driving positron beam acceleration with coherent transition radiation

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Zhangli Xu ◽  
Longqing Yi ◽  
Baifei Shen ◽  
Jiancai Xu ◽  
Liangliang Ji ◽  
...  
Keyword(s):  
Longitudinal Magnetic Field ◽  
Transition Radiation ◽  
Positron Beam ◽  
Acceleration Process ◽  
Wakefield Acceleration ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
Energy Peak ◽  
Coherent Transition Radiation ◽  
Plasma Wakefield

Abstract Positron acceleration in plasma wakefield faces significant challenges, as the positron beam must be pre-generated and precisely coupled into the wakefield and, most critically, suffers from defocusing issues. Here we propose a scheme that utilizes laser-driven electrons to produce, inject, and accelerate positrons in a single setup. The high-charge electron beam from wakefield acceleration creates copious electron–positron pairs via the Bethe–Heitler process, followed by enormous coherent transition radiation due to the electrons’ exiting from the metallic foil. Simulation results show that the coherent transition radiation field reaches up to tens of GV m−1, which captures and accelerates the positrons to cut-off energy of 1.5 GeV with energy peak of 500 MeV (energy spread ~ 24.3%). An external longitudinal magnetic field of 30 T is also applied to guide the electrons and positrons during the acceleration process. This proposed method offers a promising way to obtain GeV fast positron sources.

scholarly journals Coherent transition radiation from attosecond electron pulses

2019 ◽  
Vol 205 ◽  
pp. 02018
Author(s):  
Maxim Tsarev ◽  
Peter Baum
Keyword(s):  
Electron Microscopy ◽  
Free Electron ◽  
Transition Radiation ◽  
Beam Diameter ◽  
Pump Probe ◽  
Coherent Transition Radiation ◽  
Electron Pulses ◽  
Velocity Mismatch

We show theoretically and by simulations how coherent transition radiation from tilted surfaces can be used for characterization of attosecond free-electron pulses such as used for pump-probe electron microscopy and diffraction. The tilted geometries eliminate velocity-mismatch and beam-diameter effects, providing sensitivity to attosecond times even for almost arbitrarily large beam diameters.

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