Dependence of the electron beam parameters on the stability of laser propagation in a laser wakefield accelerator

Hafz, N.; Choi, I. W.; Sung, J. H.; Kim, H. T.; Hong, Kyung-Han; Jeong, Tae Moon; Tao, Yu; Kulagin, V. V.; Suk, Hyyong; Noh, Young‐Chul; Ko, Do‐Kyeong; Lee, J.

doi:10.1063/1.2721119

Cited by 32 publications

(19 citation statements)

References 21 publications

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“…Using the LiFSA system, the electron acceleration by the laser wakefield was performed by irradiating 100‐TW laser pulses on a supersonic helium gas flow by a 4‐mm‐long gas nozzle. The characteristics of accelerated electron bunches were investigated under different laser beam focusing conditions (f/2.5, f/10, f/14) . The formation of a stable plasma channel and the generation of stable electron beams with several tens of MeV were related to the optimal f‐number (f/10) of a focusing optic.…”

Section: Particle Accelerationmentioning

confidence: 99%

Femtosecond petawatt laser

Jeong

Lee

2014

Annalen der Physik

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The high-power femtosecond laser has now become an excellent scientific tool for the study of not only relativistic laser-matter interactions but also scientific applications. The high-power femtosecond laser depends on the Kerr-lens modelocking (KLM) and chirped-pulse amplification (CPA) technique. An all-Ti:sapphire-based 30-fs PW CPA laser, which is called the PULSER (Petawatt Ultrashort Laser System for Extreme Science Research) has been recently constructed and is being used for accelerating the charged particles (electrons and protons) and generating ultrashort high-energy photon (X-ray and γ -ray) sources. In this review, the world-wide PW-level femtosecond laser systems are first summarized, the output performances of the PULSER-I & II are described, and the future upgrade plan of the PULSER to the multi-PW level is also discussed. Then, several experimental results on particle (electron and proton) acceleration and X-ray generation in the intensity range of mid-10 18 W/cm 2 to mid-10 20 W/cm 2 are described. Experimental demonstrations for the newly proposed phenomena and the understanding of physical mechanisms in relativistic and ultrarelativistic regimes are highly expected as increasing the laser peak intensity up to over 10 22 W/cm 2 ∼10 23 W/cm 2 .

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Section: Particle Accelerationmentioning

confidence: 99%

Femtosecond petawatt laser

Jeong

Lee

2014

Annalen der Physik

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“…Mirrors having different focal lengths can be used and tested for the optimization of the peak intensity and interaction length. 10) However, in many cases, the optimization of the peak intensity and interaction length with mirrors is tedious and limited. In such a case, the control of the wavefront aberration of the laser beam using the AO system can be another approach to optimize the peak intensity and long interaction.…”

Section: Customization Of Focal Spot Of Laser Beammentioning

confidence: 99%

Wavefront Correction and Customization of Focal Spot of 100 TW Ti:Sapphire Laser System

Jeong

Choi

Hafz

et al. 2007

jjap

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The measurement and correction of wavefront aberrations of the 100 TW Ti:sapphire laser beam are presented. Several monochromatic aberrations, such as astigmatism (Z À2 2 , Z 2 2 ), coma (Z À1 3 ), trefoil (Z À3 3 , Z 3 3 ), and spherical aberration (Z 0 4 ) are observed in the 100 TW Ti:sapphire laser beam as well as defocus (Z 0 2 ), which is responsible for the converging or diverging of a laser pulse. An adaptive optics system using a bimorph deformable mirror successfully corrected a monochromatic wavefront in the 100 TW Ti:sapphire laser beam. The customization of the focal spot is also investigated using the adaptive optics system for research on the efficient generation of a high-energy electron beam. The increase in the depth of focus is demonstrated and the temporal broadening is calculated when the spherical aberration is introduced using the adaptive optics system.

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“…Non‐linear interactions of high‐power electromagnetic waves with high‐density plasmas have been a subject of research for a long time due to their applications in laser‐driven fusion, charged particle acceleration, X‐ray generation, shock wave generation, etc. These applications are due to the various non‐linear phenomena arising when an intense electromagnetic wave propagates through a plasma.…”

Section: Introductionmentioning

confidence: 99%

Increasing the peaks of non‐linear electron density near critical density in terahertz–plasma interaction

Hashemzadeh

2018

Contributions to Plasma Physics

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Increasing the peaks of non-linear electron density in the interaction between high-power terahertz beams and plasmas with electron density and electron temperature ramps is investigated. Considering the linear inhomogeneities and using the non-linear electron density, a non-linear differential equation governing the wave propagation is derived. Results show that the slope of the temperature and density ramps and their signs affect the amplitude and wavelength of oscillations of electric and magnetic fields. These effects are a result of the ponderomotive non-linearity that changes the distribution of plasma density and leads to the modification of electric and magnetic fields. Furthermore, increase or decrease in the electric field amplitude is because of the energy exchange between electrons and electric field. Profiles of the non-linear electron density indicate that, for positive values of temperature ramp, the amplitude of non-linear electron density decreases, and the wavelength of oscillations increases. However, for negative values of temperature ramp, this behaviour is vice versa. It is also illustrated that, close to critical density, electrons become more steepened. Finally, it is concluded that both positive values of density ramp and negative values of temperature ramp increase the peaks of non-linear electron density, especially near the critical density. KEYWORDS density and temperature inhomogeneities, plasma density gratings, ponderomotive non-linearity 1

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Dependence of the electron beam parameters on the stability of laser propagation in a laser wakefield accelerator

Cited by 32 publications

References 21 publications

Femtosecond petawatt laser

Femtosecond petawatt laser

Wavefront Correction and Customization of Focal Spot of 100 TW Ti:Sapphire Laser System

Increasing the peaks of non‐linear electron density near critical density in terahertz–plasma interaction

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