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In this article we present the effect of periodic magnetic field on the efficiency of a sheet beam driven C‐band backward wave oscillator (operational in Megawatt power regime) through MAGIC3D PIC simulation. At 90 kV beam energy, 200 A beam current, and 0.6 T average magnetic field, our results depict an efficiency of nearly 70% due to improved electron beam confinement and electron bunching. A qualitative...
In this paper numerical solution of exact magnetic field for planar and cylindrical beam driven backward wave oscillator is carried out at π point. Our results show that for beam parameters Vb=5.32×108 cm s−1, relativistic factor γ=1.16, and beam voltage = 80kv, nearly 7kG magnetic field is required to focus both electron beam at π point. We obtain the comparable enhancement in the growth rate of...
By employing a pair of partially overlapped supersonic gas jets, we made a separation of injection and acceleration stages of laser wakefield acceleration and produced stable, quasi-monoenergetic (10–30% FWHM) and tunable (50–300 MeV) electron beams.
400 MeV quasi-monoenergetic electron beams are produced from a wakefield driven by 70 TW, 30 fs laser pulses. To our knowledge, these beams have the highest brightness to date from any laser accelerator, and 1-2% stability.
We investigate use of laser-accelerated electron beams for high resolution long standoff, radiographic applications and detection of shielded dense materials. For first time, radiographs with sub-millimeter resolution; embedded gaps in dense materials are presented.
A quasi-monoenergetic MeV X-ray source based on laser-driven electron acceleration and Thomson scattering is under development at the Extreme Light Laboratory at the University of Nebraska, Lincoln. Reported are experimental results on the generation of high- brightness, nearly monoenergetic 300-MeV energy electron beams with the high power, short-pulse DIOCLES laser system. The laser system produces...
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