Compact and powerful THz source investigation on laser plasma wakefield injector and dielectric lined structure

Shi, Lei; Johnson, Steven L.; Reiche, S.

doi:10.1103/physrevaccelbeams.23.014701

Cited by 3 publications

(2 citation statements)

References 81 publications

(103 reference statements)

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“…Cherenkov radiation generated by charged particles bunches in dielectric structures can be used to develop high-gradient wake accelerators of the high-energy range [1][2][3][4][5] and to obtain intense coherent radiation for industrial purposes, environment monitoring and medicine [6][7][8][9][10][11][12][13][14]. However, there is severe shortcoming of dielectric wakefield accelerators (DWA) namely the susceptibility of bunches to the beam breakup (BBU) instability [15,16] peculiar to electron linear accelerators [17].…”

Section: Introductionmentioning

confidence: 99%

Focusing of Drive and Test Bunches in a Dielectric Waveguide Filled with Inhomogeneous Plasma

Sotnikov¹,

Markov²,

Onishchenko³

2020

J. Inst.

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The paper presents the results of numerical PIC-simulation of accelerated (test) and drive bunches dynamics in a dielectric waveguide of the THz frequency range filled with radially inhomogeneous plasma. The wakefield was excited by the azimuthally-symmetric on-axis drive electron bunch in a quartz dielectric tube embedded in metal waveguide. A radial displacement of test bunch is absent too. At simulations of plasma, we used different transverse density profiles, viz., the density profile formed in the capillary discharge, and the radially nonuniform density profile with the vacuum channel along the waveguide axis. For all the cases under study the plasma density was low, so that the plasma frequency was lower than the fundamental dielectric mode frequency. The obtained PIC-simulation data have shown that the vacuum channel in the inhomogeneous plasma cylinder improves the accelerated bunch focusing. There is the optimum vacuum-channel size value, at which the focusing turns out to be the strongest. The improvement in the accelerated bunch focusing is accompanied by the decrease in the accelerating gradient as compared with the full plasma filling of the drift channel. The best acceleration takes place in the absence of plasma; however, in that case the accelerated bunch focusing does not occur. K: Accelerator modelling and simulations (multi-particle dynamics; single-particle dynamics); Wake-field acceleration (laser-driven, electron-driven); Beam dynamics; Plasma generation (laser-produced, RF, x ray-produced) 1Corresponding author.

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Section: Introductionmentioning

confidence: 99%

Focusing of Drive and Test Bunches in a Dielectric Waveguide Filled with Inhomogeneous Plasma

Sotnikov¹,

Markov²,

Onishchenko³

2020

J. Inst.

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“…Knowing the exact electric shape of an ultrashort femtosecond laser pulse is essential for its practical applications, such as in the fields of ultrafast spectroscopy, quantum coherent control, and high field laser physics [1][2][3][4]. Since photoelectric devices cannot measure such ultrashort pulses in the time domain, researchers have attempted to conduct this measurement in the frequency domain.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of an ultrashort laser pulse from flexibly shaped FROG traces via ptychography algorithm

Mao¹,

Liu²

2020

Laser Phys.

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Frequency-resolved optical gating (FROG) is a popular technique for characterizing ultrashort laser pulses. This technique comprises two steps. First, a spectrogram, named FROG trace, is constructed for a pulse by measuring process. Second, an efficient algorithm is employed to retrieve the pulse information from its FROG trace. By expressing an arbitrary FROG trace using matrix multiplication, we confirm that the data on all the complex spectral components constituting the relative pulse are, in principle, encoded in the value of each point of the trace. Considering this fact and the characteristics of the measuring devices, flexibly shaped FROG traces are built by simultaneously applying low-pass filtering and up-sampling along the frequency axis and down-sampling along the delay axis to the conventional square ones. Furthermore, these practical traces can be used for the effective reconstruction of ultrashort laser pulses via the ptychography algorithm. Utilizing this specially designed trace will significantly reduce the difficulty and time-consumption in the first step of the FROG process.

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Enhanced terahertz radiation generated by intense laser interaction with a two-layer thin solid target

Hua,

Zhang,

Chen

et al. 2024

Phys. Rev. Accel. Beams

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A terahertz radiation enhancing scheme, in which a linearly polarized weakly relativistic laser pulse irradiates a target consisting of two parallel thin-solid layers with a certain gap, is proposed and studied by using two-dimensional particle-in-cell simulations. The radiation is known to be produced by laser-produced hot electrons via mechanisms such as coherent transition radiation at the target surfaces. Under optimized conditions, the energy conversion efficiency of terahertz radiation can be as high as 3.3%, which is nearly 1.5 times higher than that obtained with a single-layer target with the same drive laser. This is mainly due to the enhanced hot electron generation with moderate energy via multiple reflections of the laser pulse between the two target layers. The radiation has two peaks close to 30° from the target surface, which are more collimated than that with the single-layer target. The dependence of the terahertz radiation on a variety of target parameters is given, which can control the terahertz spectrum and radiation efficiency and thus provide guidance for experimental investigations. Moreover, both the coherent transition radiation and antenna radiation models are applied to explain the angular distributions of the terahertz emission found in the simulations. Published by the American Physical Society 2024

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Compact and powerful THz source investigation on laser plasma wakefield injector and dielectric lined structure

Cited by 3 publications

References 81 publications

Focusing of Drive and Test Bunches in a Dielectric Waveguide Filled with Inhomogeneous Plasma

Focusing of Drive and Test Bunches in a Dielectric Waveguide Filled with Inhomogeneous Plasma

Reconstruction of an ultrashort laser pulse from flexibly shaped FROG traces via ptychography algorithm

Enhanced terahertz radiation generated by intense laser interaction with a two-layer thin solid target

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