scholarly journals Generating high-yield positrons and relativistic collisionless shocks by 10 PW laser

2017 ◽  
Vol 35 (2) ◽  
pp. 234-240 ◽  
Author(s):  
J. Jiao ◽  
B. Zhang ◽  
J. Yu ◽  
Z. Zhang ◽  
Y. Yan ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Quantum Electrodynamics ◽  
Positron Beam ◽  
High Energy ◽  
High Yield ◽  
Formation Condition ◽  
Lead Target ◽  
Collisionless Shock ◽  
High Energy Cosmic Rays ◽  
Electron Positron

AbstractRelativistic collisionless shock charged particle acceleration is considered as a possible origin of high-energy cosmic rays. However, it is hard to explore the nature of relativistic collisionless shock due to its low occurring frequency and remote detecting distance. Recently, there are some works attempt to solve this problem by generating relativistic collisionless shock in laboratory conditions. In laboratory, the scheme of generation of relativistic collisionless shock is that two electron–positron pair plasmas knock each other. However, in laboratory, the appropriate pair plasmas have been not generated. The 10 PW laser pulse maybe generates the pair plasmas that satisfy the formation condition of relativistic collisionless shock due to its ultrahigh intensity and energy. In this paper, we study the positron production by ultraintense laser high Z target interaction using numerical simulations, which consider quantum electrodynamics effect. The simulation results show that the forward positron beam up to 1013/kJ can be generated by 10 PW laser pulse interacting with lead target. The estimation of relativistic collisionless shock formation shows that the positron yield satisfies formation condition and the positron divergence needs to be controlled. Our results indicate that the generation of relativistic collisionless shock by 10 PW laser facilities in laboratory is possible.

Generation of dense and well-collimated positron beam via ultra-intense laser colliding with a flying plasma layer

2021 ◽  
Author(s):  
QianQian Han ◽  
Xuesong Geng ◽  
Baifei Shen ◽  
Liangliang Ji ◽  
Zhizhan Xu
Keyword(s):  
Plasma Layer ◽  
Thin Foil ◽  
Positron Beam ◽  
Laser Pulses ◽  
Intense Laser ◽  
High Yield ◽  
Intensity Level ◽  
Electron Positron ◽  
Large Peak ◽  
Electron Positron Pair

Abstract With the forthcoming 10-100PW laser facilities, laser-driven electron-positron-pair production has gained particular interest. Here a scheme to enhance the generation of dense electron-positron-pairs is proposed and numerically demonstrated, employing double laser pulses at the intensity level of 10^23 W cm^(-2). The first laser accelerates a thin foil to a relativistic speed via the radiation-pressure-acceleration mechanism and a counter-propagating laser irradiates this flying plasma layer. The simulation results indicate that a high-yield and well-collimated positron beam (~5.5×10^10 positrons/pulse, 8.8nC/pulse) is generated with a large peak density(1.1×10^21 cm^(-3) ) by using tens-of-PW laser pulses.

scholarly journals All-optical quasi-monoenergetic GeV positron bunch generation by twisted laser fields

2022 ◽  
Vol 5 (1) ◽  
Author(s):  
Jie Zhao ◽  
Yan-Ting Hu ◽  
Yu Lu ◽  
Hao Zhang ◽  
Li-Xiang Hu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Electric Fields ◽  
High Energy Physics ◽  
Energetic Electron ◽  
Three Dimensional ◽  
High Energy ◽  
Electron Positron ◽  
All Optical ◽  
Positron Bunch ◽  
Energy Physics

AbstractGeneration of energetic electron-positron pairs using multi-petawatt (PW) lasers has recently attracted increasing interest. However, some previous laser-driven positron beams have severe limitations in terms of energy spread, beam duration, density, and collimation. Here we propose a scheme for the generation of dense ultra-short quasi-monoenergetic positron bunches by colliding a twisted laser pulse with a Gaussian laser pulse. In this scheme, abundant γ-photons are first generated via nonlinear Compton scattering and positrons are subsequently generated during the head-on collision of γ-photons with the Gaussian laser pulse. Due to the unique structure of the twisted laser pulse, the positrons are confined by the radial electric fields and experience phase-locked-acceleration by the longitudinal electric field. Three-dimensional simulations demonstrate the generation of dense sub-femtosecond quasi-monoenergetic GeV positron bunches with tens of picocoulomb (pC) charge and extremely high brilliance above 1014 s−1 mm−2 mrad−2 eV−1, making them promising for applications in laboratory physics and high energy physics.

scholarly journals Measurement of electron-positron spectrum in high-energy cosmic rays in the PAMELA experiment

2015 ◽  
Vol 632 ◽  
pp. 012014 ◽  
Author(s):  
A V Karelin ◽  
O Adriani ◽  
G C Barbarino ◽  
G A Bazilevskaya ◽  
R Bellotti ◽  
...  
Keyword(s):  
Cosmic Rays ◽  
High Energy ◽  
Pamela Experiment ◽  
High Energy Cosmic Rays ◽  
Electron Positron ◽  
Positron Spectrum

scholarly journals Pair Production in Intense Electromagnetic Fields of Pulsars

1987 ◽  
Vol 125 ◽  
pp. 61-61
Author(s):  
T.Y. Shi
Keyword(s):  
Pair Production ◽  
Electromagnetic Fields ◽  
Quantum Electrodynamics ◽  
High Energy ◽  
Electron Positron

The possible existence of strong electromagnetic fields in pulsars has motivated extensive interest in investigation of various quantum electrodynamics processes. In particular, the process of converting high energy photons into electron-positron pairs is of great significance in pulsar theory.

scholarly journals Laboratory study of astrophysical collisionless shock at SG-II laser facility

2018 ◽  
Vol 6 ◽  
Author(s):  
Dawei Yuan ◽  
Huigang Wei ◽  
Guiyun Liang ◽  
Feilu Wang ◽  
Yutong Li ◽  
...  
Keyword(s):  
Nuclear Reactions ◽  
High Energy ◽  
Laboratory Astrophysics ◽  
Observation Data ◽  
Collisionless Shock ◽  
Astrophysical Plasmas ◽  
High Energy Cosmic Rays ◽  
Physical Conditions ◽  
Laser Facility ◽  
Astrophysical Observation

Astrophysical collisionless shocks are amazing phenomena in space and astrophysical plasmas, where supersonic flows generate electromagnetic fields through instabilities and particles can be accelerated to high energy cosmic rays. Until now, understanding these micro-processes is still a challenge despite rich astrophysical observation data have been obtained. Laboratory astrophysics, a new route to study the astrophysics, allows us to investigate them at similar extreme physical conditions in laboratory. Here we will review the recent progress of the collisionless shock experiments performed at SG-II laser facility in China. The evolution of the electrostatic shocks and Weibel-type/filamentation instabilities are observed. Inspired by the configurations of the counter-streaming plasma flows, we also carry out a novel plasma collider to generate energetic neutrons relevant to the astrophysical nuclear reactions.

scholarly journals CHARGE-NUMBER OF PULSES-CONVERTER

2020 ◽  
pp. 94-96
Author(s):  
V.L. Morokhovskii ◽  
V.V. Morokhovskyi ◽  
V.N. Pirogov
Keyword(s):  
Positron Beam ◽  
High Energy ◽  
Energy Electron ◽  
Relativistic Electrons ◽  
X Rays ◽  
Linear Electron ◽  
High Energy Electron ◽  
Charge Number ◽  
Electron Accelerators ◽  
Electron Positron

It is described the charge-number of pulses-converter, which was successfully applied in the ”Program-apparatus complex for investigation of gamma- and X-rays radiations, generated by relativistic electrons in crystals” [1] at Kharkiv linear electron accelerators. This device is in the condition for high energy electron (positron) beam charge measurements with accuracy 2·10−10 C and current measurements in the range of 10−10...10−8 A.

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