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Probing and possible application of the QED vacuum with micro-bubble implosions induced by ultra-intense laser pulses

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Matter and Radiation at extremes 2019年第3期4卷 18-24页

作者： James K.Koga Masakatsu Murakami Alexey V.Arefiev Yoshihide Nakamiya Kansai Photon Science Institute National Institutes for Quantum and Radiological Science and TechnologyKizugawaKyoto 619-0215Japan Institute of Laser Engineering Osaka UniversityOsaka 565-0871Japan Department of Mechanical and Aerospace Engineering University of California at San DiegoLa JollaCalifornia 92093USA extreme light infrastructure-nuclear physics(ELI-NP)/Horia Hulubei National Institute forR&Din physicsandnuclear Engineering(IFIN-HH) 30 Reactorului St.P.O.Box MG-6Bucharest-MagureleJudet¸ul Ilfov RO-077125Romania

The interaction of micro-bubbles with ultra-intense laser pulses has been shown to generate ultra-high proton densities and correspondingly high electric *** the possibility of using such a combination to study the fundamental physical phenomenon of vacuum *** current or near-future laser systems,measurement of vacuum polarization via the bending of gamma rays that pass near imploded microbubbles may be *** it is independent of photon energy to within the leading-order solution of the Heisenberg–Euler Lagrangian and the geometric optics approximation,the corresponding index of refraction can dominate the indices of refraction due to other effects at sufficiently high photon *** consider the possibility of its application to a transient gamma-ray lens.

关键词： laser polarization vacuum

Radiation reaction induced spiral attractors in ultra-intense colliding laser beams

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Matter and Radiation at extremes 2016年第6期1卷 308-315页

作者： Zheng Gong Ronghao Hu Yinren Shou Bin Qiao Chiaer Chen Furong Xu Xiantu He Xueqing Yan State Key Laboratory of nuclear physics and Technology and Key Laboratory of HEDPof the Ministry of EducationCAPTPeking UniversityBeijing100871China Collaborative Innovation Center of extreme Optics Shanxi UniversityTaiyuanShanxi030006China

The radiation reaction effects on electron dynamics in counter-propagating circularly polarized laser beams are investigated through the linearization theorem and the results are in great agreement with numeric *** the first time,the properties of fixed points in electron phase-space were analyzed with linear stability theory,showing that center nodes will become attractors if the classical radiation reaction is *** dynamics are significantly affected by the properties of the fixed points and the electron phase-space densities are found to be increasing exponentially near the *** density growth rates are derived theoretically and further verified by particle-in-cell sim-ulations,which can be detected in experiments to explore the effects of radiation reaction *** attractor can also facilitate realizing a series of nanometer-scaled flying electron slices via adjusting the colliding laser frequencies.

关键词： Radiation reaction effect Phase space dynamics PIC simulation

D_(s_1)(2536)^+ decays and the structure of P-wave charmed strange mesons

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Chinese physics C 2010年第9期34卷 1408-1410页

作者： J.Segovia D.R.Entem F.Fernández nuclear physics Group University of Salamanca IUFFyM University of Salamanca

We calculate the D s 1 （2536） ^＋ decays into D＊K channels,including the decay D s 1 （2536）＋ → D ＋ π-K ＋ through a virtual D＊0 in a constituent quark *** and S/D amplitudes ratio are in agreement with the ... 详细信息

关键词： meson spectra meson decays non relativistic quark models multiquarks

Diagnosis of ultrafast ultraintense laser pulse characteristics by machine-learning-assisted electron spin

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Matter and Radiation at extremes 2023年第3期8卷 1-9页

作者： Zhi-Wei Lu Xin-Di Hou Feng Wan Yousef I.Salamin Chong Lv Bo Zhang Fei Wang Zhong-Feng Xu Jian-Xing Li Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic DevicesSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China Department of physics American University of SharjahP.O.Box 26666SharjahUnited Arab Emirates Department of nuclear physics China Institute of Atomic EnergyP.O.Box 275(7)Beijing 102413China Key Laboratory of Plasma physics Research Center of Laser FusionChina Academy of Engineering PhysicsMianshan Rd.64#MianyangSichuan 621900China School of Mathematics and Statistics Xi’an Jiaotong UniversityXi’anShaanxi 710049China

The rapid development of ultrafast ultraintense laser technology continues to create opportunities for studying strong-field physics under extreme ***,accurate determination of the spatial and temporal characteristics of a laser pulse is still a great challenge,especially when laser powers higher than hundreds of terawatts are *** this paper,by utilizing the radiative spin-flip effect,we find that the spin depolarization of an electron beam can be employed to diagnose characteristics of ultrafast ultraintense lasers with peak intensities around 10^(20)–10^(22) W/cm^(2).With three shots,our machine-learning-assisted model can predict,simultaneously,the pulse duration,peak intensity,and focal radius of a focused Gaussian ultrafast ultraintense laser(in principle,the profile can be arbitrary)with relative errors of 0.1%–10%.The underlying physics and an alternative diagnosis method(without the assistance of machine learning)are revealed by the asymptotic approximation of the final spin degree of *** proposed scheme exhibits robustness and detection accuracy with respect to fluctuations in the electron beam *** measurements of ultrafast ultraintense laser parameters will lead to much higher precision in,for example,laser nuclear physics investigations and laboratory astrophysics *** machine learning techniques may also find applications in more general strong-field physics scenarios.

关键词： pulse laser intense

Development of a 500-MHz waveguide directional coupler with high directivity for HEPS

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Radiation Detection Technology and Methods 2022年第3期6卷 323-329页

作者： Yuanli Luo Jian Li Pei Zhang Qiang Ma Haiying Lin Tongming Huang Fanbo Meng Facheng Zhao Ziwei Deng Institute of High Energy physics(IHEP) Chinese Academy of Sciences(CAS)Beijing 100049China School of nuclear Sciences and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration physics and Technology IHEPCASBeijing 100049China

Purpose In order to achieve a high-precision measurement of the incident and the reﬂected power,a WR1800 rectangular waveguide directional coupler with high directivity and high power level has been in-house *** couplers will be installed in the 500-MHz high-power radio-frequency transmission lines delivering 200-kW continuous-wave power for the High Energy Photon Source(HEPS).Methods The directional coupler adopts the design scheme of primary and secondary transmission lines and coaxial coupling-head *** shape and dimensional parameters of the coupling head were carefully optimized by using microwave simulation *** optimum directivity of 64 dB was achieved in *** and conclusions A prototype coupler was subsequently manufactured,and its directivity was measured to be 48.2 dB following a rigorous calibration procedure,largely exceeding the design goal and the commercial *** coupler was then connected to an existing 500-MHz klystron system,and a high-power test with short-circuit termination was *** high directivity of the coupler was conﬁrmed up to 200 *** the 6 hours of power aging with continuous-wave 200 kW in a standing-wave setup,no performance degradation was observed on the *** coupler temperature was measured to be 20◦C above the ambient *** design requirements were comfortably fulﬁ*** constitute theﬁrst in-house development of a large-size waveguide directional coupler with high directivity and high power level for *** design,fabrication,and performance tests of the directional coupler are presented.

关键词： Directional coupler High directivity Simulation optimization High-power RF High Energy Photon Source

Radio-frequency system of the high energy photon source

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Radiation Detection Technology and Methods 2023年第1期7卷 159-170页

作者： Pei Zhang Jin Dai Ziwei Deng Lin Guo Tongming Huang Dongbing Li Jian Li Zhongquan Li Haiying Lin Yuanli Luo Qiang Ma Fanbo Meng Zhenghui Mi Qunyao Wang Haisheng Xu Xinying Zhang Facheng Zhao Hongjuan Zheng Institute of High Energy physics(IHEP) Chinese Academy of Sciences(CAS)Beijing100049China School of nuclear Sciences and Technology University of Chinese Academy of SciencesBeijing100049China Key Laboratory of Particle Acceleration physics and Technology IHEPCASBeijing100049China

Purpose High energy photon source is a 6 GeV diffraction-limited storage ring light source currently under construction in Beijing.A low-frequency fundamental radio-frequency(rf)system of 166.6 MHz was proposed to accommodate the accelerator physics *** rf(srf)technologies were chosen for the storage ring rf accompanied by solid-state power amplifiers and digital low-level rf *** design of the rf system was completed,and the parameters are *** of the rf design with key parameters is *** The requirements from the accelerator physics design will be presented followed by the detailed rf *** logic behind the choice of key rf parameters is *** configuration of the entire rf system is *** and conclusions The fundamental srf cavity of 166.6 MHz was designed to accelerate the ultrarelativistic electron *** damping of higher-order modes in these cavities is required to avoid the coupled bunch *** active third harmonic srf of 499.8 MHz was adopted to realize the required rf ***-conducting 5-cell cavities will be used for the booster ***-state amplifiers of 2.4 MW in total will be installed at HEPS to drive these cavities in the booster and the storage ring.A digital low-level rf system will be used to regulate rf field inside each cavity with high *** rf configuration during the commissioning and the operation scenarios are also presented.

关键词： Radio-frequency system-Superconducting Rf High-power Rf Low-level Rf High energy photon source

Zernike-coefficient extraction via helical beam reconstruction for optimization(ZEHBRO) in the far field

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High Power Laser Science and Engineering 2023年第6期11卷 213-222页

作者： J.B.Ohland D.Posor U.Eisenbarth V.Iancu R.Ungureanu D.Ursescu V.Bagnoud GSI Helmholtzzentrum für Schwerionenforschung DarmstadtGermany Institut für angewandte Physik Technische Universität DarmstadtDarmstadtGermany Helmholtz-Institut Jena JenaGermany ELI-NP Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering(IFIN-HH)M agureleIlfovRomania Faculty of physics University of BucharestM agureleIlfovRomania Center for Advanced Laser Technologies(CETAL) National Institute for LaserPlasma and Radiation Physics(INFLPR)M agureleIlfovRomania

The spatial distribution of beams with orbital angular momentum in the far field is known to be extremely sensitive to angular aberrations,such as astigmatism,coma and *** poses a challenge for conventional beam optimization strategies when a homogeneous ring intensity is required for an *** developed a novel approach for estimating the Zernike coefficients of low-order angular aberrations in the near field based solely on the analysis of the ring deformations in the far field.A fast,iterative reconstruction of the focal ring recreates the deformations and provides insight into the wavefront deformations in the near field without relying on conventional phase retrieval *** output of our algorithm can be used to optimize the focal ring,as demonstrated experimentally at the 100 TW beamline at the extreme light infrastructure-nuclear physics facility.

关键词： beam quality far field orbital angular momentum ring intensity phase retrieval wavefront

Strange quark matter and proto-strange stars in a baryon density-dependent quark mass model

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Chinese physics C 2022年第5期46卷 171-179页

作者：陈怀民夏铖君彭光雄 School of nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China Theoretical physics Center for Science Facilities Institute of High Energy PhysicsBeijing 100049China Synergetic Innovation Center for Quantum Effects and Application Hunan Normal UniversityChangsha 410081China

The properties of strange quark matter and the structures of(proto-)strange stars are studied within the framework of a baryon density-dependent quark mass model,where a novel quark mass scaling and self-consistent thermodynamic treatment are *** results indicate that the perturbative interaction has a significant impact on the properties of strange quark *** is determined that the energy per baryon increases with temperature,while the free energy decreases and eventually becomes *** fixed temperatures,the pressure at the minimum free energy per baryon is zero,suggesting that the thermodynamic self-consistency is ***,the sound velocity v in quark matter approaches the extreme relativistic limit(c/√3)as the density *** increasing the strengths of the confinement parameter D and perturbation parameter C,the tendency for v to approach the extreme relativistic limit at high density is slightly ***(proto-)strange stars,the novel quark mass scaling can accommodate massive proto-strange stars with their maximum mass surpassing twice the solar mass by considering the isentropic stages along the star evolution line,where the entropy per baryon of the star matter is set to be 0.5 and 1 with the lepton fraction Y_(l)=0.4.

关键词： strange quark matter temperature thermodynamic

Use of photoelectron energy spectrum transfer equation for the measurement of a narrowband XUV pulse

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Chinese Science Bulletin 2012年第8期57卷 843-848页

作者： GE YuCheng HE HaiPing School of physics and State Key Laboratory of nuclear physics and Technology Peking UniversityBeijing 100871China

To study the time evolution of a molecular state in an ultra-fast chemical reaction,the use of shorter pulses with higher photon energy and narrower bandwidth for both pump and probe is ***,quick and precise measurement of their detailed time structures is a *** the last decade,great efforts have been made to measure an attosecond extreme ultraviolet (XUV) *** date,several methods have been developed to measure the pulse duration and completely reconstruct *** attosecond spectral phase interferometry for direct electric field reconstruction (SPIDER) and attosecond frequency-resolved optical gating (FROG) techniques are often ***,these methods use state-of-the-art experimental set-ups and complicated data analysis *** develop attosecond metrology for practical use (***,measurement,evaluation,calibration,optimization,pumping,probing),we propose a quick and analytical method to precisely observe an attosecond XUV pulse with laser-assisted *** method is based on determining the laser-related phase of each streaked electron and using a transfer equation for one-step pulse reconstruction without any time-resolved measurements,iterative calculations,or data fitting *** errors of the pulse reconstruction are calculated from the XUV *** the transfer equation establishes a direct connection between the XUV pulse properties,the crucial laser parameters (peak intensity,phase,carrier envelope phase),the atomic ionization potential,and the measured photoelectron energy spectrum,we can use it to study any one of these properties from other known information and probe the dynamic processes of an ultra-fast reaction.

关键词：时间分辨测量光电子能谱远紫外线传输方程短脉冲窄带超快化学反应脉冲持续时间