Role of the pre-plasma on electron beam currents from a biased laser-plasma

2019 ◽  
Vol 90 (5) ◽  
pp. 053306 ◽  
Author(s):  
Maud Versteegen ◽  
Xavier Raymond ◽  
Franck Gobet ◽  
Jose Luis Henares
Keyword(s):  
Electron Beam ◽  
Laser Plasma ◽  
Beam Currents

scholarly journals Control of electron beam energy-spread by beam loading effects in a laser-plasma accelerator

2020 ◽  
Vol 62 (5) ◽  
pp. 055004 ◽  
Author(s):  
Guangyu Li ◽  
Quratul Ain ◽  
Song Li ◽  
Muhammad Saeed ◽  
Daniel Papp ◽  
...  
Keyword(s):  
Electron Beam ◽  
Laser Plasma ◽  
Beam Energy ◽  
Plasma Accelerator ◽  
Energy Spread ◽  
Electron Beam Energy ◽  
Beam Loading ◽  
Loading Effects ◽  
Laser Plasma Accelerator

A coherent harmonic generation method for producing femtosecond coherent radiation in a laser plasma accelerator based light source

2021 ◽  
Vol 28 (3) ◽  
pp. 669-680
Author(s):  
Weihang Liu ◽  
Chao Feng ◽  
Yi Jiao ◽  
Sheng Wang
Keyword(s):  
Electron Beam ◽  
Light Source ◽  
Laser Plasma ◽  
Percent Level ◽  
Coherent Radiation ◽  
Level Energy ◽  
Seed Laser ◽  
Energy Modulation ◽  
Density Modulation ◽  
Longitudinal Position

The electron beam generated in laser plasma accelerators (LPAs) has two main initial weaknesses – a large beam divergence (up to a few milliradians) and a few percent level energy spread. They reduce the beam brightness and worsen the coherence of the LPA-based light source. To achieve fully coherent radiation, several methods have been proposed for generating strong microbunching on LPA beams. In these methods, a seed laser is used to induce an angular modulation into the electron beam, and the angular modulation is converted into a strong density modulation through a beamline with nonzero longitudinal position and transverse angle coupling. In this paper, an alternative method to generate microbunching into the LPA beam by using a seed laser that induces an energy modulation and transverse–longitudinal coupling beamlines that convert the energy modulation into strong density modulation is proposed. Compared with the angular modulation methods, the proposed method can use more than one order of magnitude lower seed laser power to achieve similar radiation performance. Simulations show that with the proposed method a coherent pulse of a few microjoules pulse energy and femtosecond duration can be generated with a typical LPA beam.

scholarly journals Skew Quadrupole Effect of Laser Plasma Electron Beam Transport

2019 ◽  
Vol 9 (12) ◽  
pp. 2447 ◽  
Author(s):  
Driss Oumbarek Espinos ◽  
Amin Ghaith ◽  
Thomas André ◽  
Charles Kitégi ◽  
Mourad Sebdaoui ◽  
...  
Keyword(s):  
Electron Beam ◽  
Laser Plasma ◽  
Free Electron ◽  
Free Electron Laser ◽  
Plasma Electron ◽  
Beam Transport ◽  
Emittance Growth ◽  
Quadrupole Effect ◽  
Beam Parameters ◽  
Electron Beam Transport

Laser plasma acceleration (LPA) capable of providing femtosecond and GeV electron beams in cm scale distances brings a high interest for different applications, such as free electron laser and future colliders. Nevertheless, LPA high divergence and energy spread require an initial strong focus to mitigate the chromatic effects. The reliability, in particular with the pointing fluctuations, sets a real challenge for the control of the dispersion along the electron beam transport. We examine here how the magnetic defects of the first strong quadrupoles, in particular, the skew terms, can affect the brightness of the transported electron beam, in the case of the COXINEL transport line, designed for manipulating the electron beam properties for a free electron laser application. We also show that the higher the initial beam divergence, the larger the degradation. Experimentally, after having implemented a beam pointing alignment compensation method enabling us to adjust the position and dispersion independently, we demonstrate that the presence of non-negligible skew quadrupolar components induces a transversal spread and tilt of the beam, leading to an emittance growth and brightness reduction. We are able to reproduce the measurements with beam transport simulations using the measured electron beam parameters.

Annihilation Behaviors of Athermal ω-Phase Crystals Due to Electron Irradiation

2000 ◽  
Vol 6 (4) ◽  
pp. 362-367 ◽  
Author(s):  
Hajime Matsumoto ◽  
Eiichi Sukedai ◽  
Hatsujiro Hashimoto
Keyword(s):  
Electron Beam ◽  
Electron Irradiation ◽  
Beam Current ◽  
Dark Field ◽  
Electron Beam Current ◽  
Ω Phase ◽  
Observation Methods ◽  
Incubation Periods ◽  
Beam Currents

AbstractAnnihilation behaviors of athermal ω-phase crystals formed by cooling at 131 K for 10.8 ks under four different electron irradiation conditions of acceleration voltages of 200 kV and 160 kV, and beam currents of approximately 20 pA/cm2 and 5 pA/cm2 were investigated using in situ dark field and HREM observation methods at 131 K. The effect of acceleration voltages on the lifetimes is recognized, i.e., in the case of approximately equal electron beam current, lifetimes at 200 kV become shorter than those at 160 kV. Also, lifetimes depend on the electron beam current at 200 kV, i.e., the higher the beam currents, the shorter the lifetimes become. However, no distinct dependence can be seen at 160 kV. Since annihilations of athermal ω-phase crystals begin after the electron irradiation for a certain period in each condition, which depends on acceleration voltages and beam currents, it is suggested that the annihilation behaviors have incubation periods.

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