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Dense pair plasma generation by two laser pulses colliding in a cylinder channel

Chinese Physics B 2017年第3期26卷 361-368页

作者：刘建勋马燕云余同普赵军杨晓虎邹德滨张国博赵媛杨靖康李汉臻卓红斌邵福球 Shigeo Kawata College of Science National University of Defense Technology Changsha 410073 China College of Electronic Engineering Wuhan 430019 China IFSA Collaborative Innovation Center Shanghai Jiao Tong University Shanghai 200240 China Laser Fusion Research Center China Academy of Engineering Physics Mianyang 621000 China Center for Optical Research and Education Graduate School of Engineering Utsunomiya University 7-1-2 Yohtoh Utsunomiya 321-8585 Japan

An all-optical scheme for high-density pair plasmas generation is proposed by two laser pulses colliding in a cylinder channel. Two dimensional particle-in-cell simulations show that, when the first laser pulse propagates in the cylinder, electrons are extracted out of the cylinder inner wall and accelerated to high energies. These energetic electrons later run into the second counter-propagating laser pulse, radiating a large amount of high-energy gamma photons via the Compton back-scattering process. The emitted gamma photons then collide with the second laser pulse to initiate the Breit-Wheeler process for pairs production. Due to the strong self-generated fields in the cylinder, positrons are confined in the channel to form dense pair plasmas. Totally, the maximum density of pair plasmas can be 4.60 × 10^27 m%-3, for lasers with an intensity of 4 × 10^22 ***^-2. Both the positron yield and density are tunable by changing the cylinder radius and the laser parameters. The generated dense pair plasmas can further facilitate investigations related to astrophysics and particle physics.

关键词： pair plasma laser pulse simulation

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Dynamical behaviour of transverse plasmons in pair plasmas

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Chinese Physics B 2011年第1期20卷 463-467页

作者：刘三秋刘勇李晓卿 School of Materials Science and Engineering Nanchang University Department of Physics Nanchang University School of Sciences Nantong University

This paper analytically investigates the nonlinear behaviour of transverse plasraons in pair plasmas on the basis of the nonlinear governing equations obtained from Vlasov-Maxwell equations. It shows that high frequency transverse plasmons are modulationally unstable with respect to the uniform state of the pair plasma. Such an instability would cause wave field collapse into a localized region. During the collapse process, ponderomotive expulsion is greatly enhanced for the increase of wave field strength, leading to the formation of localized density cavitons which are significant for the future experimental research in the interaction between high frequency electromagnetic waves and pair plasmas.

关键词： transverse plasmon pair plasma modulational instability density caviton

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Thomson scattering off a pair （electron-positron） plasma

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Chinese Physics B 2006年第5期15卷 1028-1034页

作者：郑坚 CAS Key Laboratory of Basic plasma Physics Department of Modern Physics University of Science and Technology of China Hefei 230026 China

Thomson scattering off a pair （electron-positron） plasma is theoretically investigated in the collisionless and collisional limits respectively. Our calculations show that the power spectrum of the Thomson scattering off a collisionless pair plasma is just proportional to the velocity distribution function of the particles in the plasma. Collective modes in the plasma do not have any effects on the Thomson scattering spectrum because of the correlation between the negatively- and positively-charged particles. In the collisional limit, the power spectrum of the Thomson scattering presents three spikes： two peaks correspond to two contra-propagating sound waves and one peak corresponds to an entropy wave.

关键词： pair plasma Thomson scattering dynamic form factor

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