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中国物理B（英文版）
中国物理B（英文版）

欧阳钟灿

月刊

1674-1056

010-82649026 82649519

100080

北京603信箱

中国物理B（英文版）/Journal Chinese Physics　BCSCDCSTPCD北大核心EISCI
查看更多>>该刊与《物理学报》是中国物理学会主办的物理学英文和中文的综合性国际学术月刊。刊登物理学科领域中，国内外未曾公开发表的具有创新性的科学研究最新成果。内容包括物理学各领域的理论、实验技术及应用。两刊内容不重复。两刊以论文水平高、创新性强，发表速度快的特点，受到国内外物理学工作者的好评和关注。被国际著名的SCI等10种以上检索系统收录。曾多次被评为中国科学院优秀期刊一等奖，1999，2003，2005年荣获第一、第二和第三届国家期刊奖，2001年被国家新闻出版总署评为“中国期刊方阵”中的双高（高知名度、高学术水平）期刊。2001，2002，2003年两刊都评为百种中国杰出期刊。
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    Effective transmittance of Fabry-Perot cavity under non-parallel beam incidence

    吕寅生谢品华徐晋李友涛...
    496-505页
    查看更多>>摘要：The Fabry-Pérot(FP)resonant cavity is widely used in laser and spectroscopic measurements due to its unique interference transfer function(ITF).In the ideal case of parallel incident light,the ITF of the FP resonant cavity can be expressed by the Airy function.However,in reality,it is difficult to achieve perfect parallelism with collimated beams.In this article,a theoretical model is established for non-parallel light incidence,which assumes that the non-parallel incident light is a cone-shaped beam,and the cone angle is used to quantify the non-parallelism of the beam.The transmittance function of the FP resonant cavity under non-parallel light incidence is derived.The accuracy of the model is experimentally verified.Based on this model,the effects of divergence angle,tilt angle and FP cavity parameters(reflectivity,cavity length)on the ITF are studied.The reasons for the decrease in peak value,broadening and asymmetry of the interference peak under non-parallel light incidence are explained.It is suggested that a fine balance between the interference peak and the collimation effect of the incident light should be considered in the design and application of FP resonant cavities,especially for tilted applications such as angle-scanned spectroscopy.The research results of this article have certain significance for the design and application of FP resonant cavities.
      原文链接:
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    Terahertz quasi-perfect vortex beam with integer-order and fractional-order generated by spiral spherical harmonic axicon

    涂思语刘德峰刘劲松杨振刚...
    506-516页
    查看更多>>摘要：We propose a new method to generate terahertz perfect vortex beam with integer-order and fractional-order.A new optical diffractive element composed of the phase combination of a spherical harmonic axicon and a spiral phase plate is designed and called spiral spherical harmonic axicon.A terahertz Gaussian beam passes through the spiral spherical harmonic axicon to generate a terahertz vortex beam.When only the topological charge number carried by spiral spherical harmonic axicon increases,the ring radius of terahertz vortex beam increases slightly,so the beam is shaped into a terahertz quasi-perfect vortex beam.Importantly,the terahertz quasi-perfect vortex beam can carry not only integer-order topological charge number but also fractional-order topological charge number.This is the first time that vortex beam and quasi-perfect vortex beam with fractional-order have been successfully realized in terahertz domain and experiment.
      原文链接:
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    • 维普

    Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media

    赵志强刘金霞刘建宇崔志文...
    517-526页
    查看更多>>摘要：In-situ stress is a common stress in the exploration and development of oil reservoirs.Therefore,it is of great sig-nificance to study the propagation characteristics of borehole acoustic waves in fluid-saturated porous media under stress.Based on the acoustoelastic theory of fluid-saturated porous media,the field equation of fluid-saturated porous media under the conditions of confining pressure and pore pressure and the acoustic field formula of multipole source excitation in open hole are given.The influences of pore pressure and confining pressure on guided waves of multipole borehole acoustic field in fluid-saturated porous media are investigated.The numerical results show that the phase velocity and excitation intensity of guided wave increase significantly under the confining pressure.For a given confining pressure,the phase velocity of the guided wave decreases with pore pressure increasing.The excitation intensity of guided wave increases at low frequency and then decreases at high frequency with pore pressure increasing,except for that of Stoneley wave which decreases in the whole frequency range.These results will help us get an insight into the influences of confining pressure and pore pressure on the acoustic field of multipole source in borehole around fluid-saturated porous media.
      原文链接:
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    • 维普

    Scheme of negative acoustic radiation force based on a multiple-layered spherical structure

    宫门阳徐鑫乔玉配刘杰惠...
    527-538页
    查看更多>>摘要：Acoustic radiation force(ARF),as an important particle manipulation method,has been extensively studied in recent years.With the introduction of the concept of"acoustic tweezers",negative acoustic radiation has become a research hotspot.In this paper,a scheme of realizing negative ARF based on the multiple-layered spherical structure design is proposed.The specific structure and design idea are presented.Detailed theoretical calculation analysis is carried out.Numerical simulations have been performed to verify the correctness of this prediction.The conjecture that the suppression of backscattering can achieve negative ARF is verified concretely,which greatly expands the application prospect and design ideas of the ARF.This work has laid a theoretical foundation for realizing precise control of the structure.
      原文链接:
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    • 维普

    Discrete multi-step phase hologram for high frequency acoustic modulation

    周梦晴李照希李怡王业成...
    539-547页
    查看更多>>摘要：Acoustic holograms can recover wavefront stored acoustic field information and produce high-fidelity complex acous-tic fields.Benefiting from the huge spatial information that traditional acoustic elements cannot match,acoustic holograms pursue the realization of high-resolution complex acoustic fields and gradually tend to high-frequency ultrasound appli-cations.However,conventional continuous phase holograms are limited by three-dimensional(3D)printing size,and the presence of unavoidable small printing errors makes it difficult to achieve acoustic field reconstruction at high frequency accuracy.Here,we present an optimized discrete multi-step phase hologram.It can ensure the reconstruction quality of image with high robustness,and properly lower the requirement for the 3D printing accuracy.Meanwhile,the concept of reconstruction similarity is proposed to refine a measure of acoustic field quality.In addition,the realized complex acoustic field at 20 MHz promotes the application of acoustic holograms at high frequencies and provides a new way to generate high-fidelity acoustic fields.
      原文链接:
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    • 维普

    Electron characteristics and dynamics in sub-millimeter pulsed atmospheric dielectric barrier discharge

    方骏林张亚容卢陈梓顾莉莉...
    548-555页
    查看更多>>摘要：The discharge characteristics and mechanism of sub-millimeter pulsed dielectric barrier discharge in atmospheric-pressure helium are investigated experimentally and theoretically,demonstrating that when the discharge gap distance is reduced from 1.00 mm to 0.20 mm,the discharge ignition time is reduced to approximately 40 ns and discharge intensity is enhanced in terms of the discharge optical emission intensity and density of the plasma species,(energetic electrons with energy above 8.40 eV).The simulated results show that as the discharge gap distance is further reduced to 0.10 mm,the number of energetic electrons decreases,which is attributable to the contraction of plasma bulk regime and reduction of electron density in the discharge bulk.Conversely,the proportion of energetic electrons to the total electrons in the discharge monotonically increases as the discharge gap distance is reduced from 1.00 mm to 0.10 mm.It is proposed that a gap distance of 0.12 mm is optimal to achieve a high concentration and proportion of energetic electrons in sub-millimeter pulsed atmosphere dielectric barrier discharge.
      原文链接:
    • 万方数据
    • 维普

    Numerical study of alpha particle loss with toroidal field ripple based on CFETR steady-state scenario

    李钮琦徐颖峰钟方川张德兵...
    556-564页
    查看更多>>摘要：Effects of plasma equilibrium parameters on the alpha particle loss with the toroidal field ripple based on the CFETR steady-state scenario have been numerically investigated by the orbit-following code GYCAVA.It is found that alpha particle losses decrease and loss regions become narrower with the plasma current increasing or with the magnetic field decreasing.It is because the ripple stochastic transport and the ripple well loss of alpha particle are reduced with the safety factor decreasing.Decrease of the plasma density and temperature can reduce alpha particle losses due to enhancement of the slowing-down effect.The direction of the toroidal magnetic field can significantly affect heat loads induced by lost alpha particle.The vertical asymmetry of heat loads induced by the clockwise and counter-clockwise toroidal magnetic fields are due to the fact that the ripple distribution is asymmetric about the mid-plane,which can be explained by the typical orbits of alpha particle.The maximal heat load of alpha particle for the clockwise toroidal magnetic field is much smaller than that for the counter-clockwise one.
      原文链接:
    • 万方数据
    • 维普

    Growth mechanism and characteristics of electron drift instability in Hall thruster with different propellant types

    陈龙阚子晨高维富段萍...
    565-577页
    查看更多>>摘要：The existence of a significant electron drift instability(EDI)in the Hall thruster is considered as one of the possible causes of the abnormal increase in axial electron mobility near the outlet of the channel.In recent years,extensive simulation research on the characteristics of EDI has been conducted,but the excitation mechanism and growth mechanism of EDI in linear stage and nonlinear stage remain unclear.In this work,a one-dimensional PIC model in the azimuthal direction of the thruster near-exit region is established to gain further insights into the mechanism of the EDI in detail,and the effects of different types of propellants on EDI characteristics are discussed.The changes in axial electron transport caused by EDI under different types of propellants and electromagnetic field strengths are also examined.The results indicate that EDI undergoes a short linear growth phase before transitioning to the nonlinear phase and finally reaching saturation through the ion Landau damping.The EDI drives a significant ion heating in the azimuthal direction through electron-ion friction before entering the quasi-steady state,which increases the axial mobility of the electrons.Using lighter atomic weight propellant can effectively suppress the oscillation amplitude of EDI,but it will increase the linear growth rate,frequency,and phase velocity of EDI.Compared with the classical mobility,the axial electron mobility under the EDI increases by three orders of magnitude,which is consistent with experimental phenomena.The change of propellant type is insufficient to significantly change the axial electron mobility.It is also found that the collisions between electrons and neutral gasescan significantly affect the axial electron mobility under the influence of EDI,and lead the strength of the electric field to increase and the strength of the magnetic field to decrease,thereby both effectively suppressing the axial transport of electrons.
      原文链接:
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    • 维普

    Fluid-chemical modeling of the near-cathode sheath formation process in a high current broken in DC air circuit breaker

    彭世东李静段薇曹云东...
    578-594页
    查看更多>>摘要：When the contacts of a medium-voltage DC air circuit breaker(DCCB)are separated,the energy distribution of the arc is determined by the formation process of the near-electrode sheath.Therefore,the voltage drop through the near-electrode sheath is an important means to build up the arc voltage,which directly determines the current-limiting performance of the DCCB.A numerical model to describe the near-electrode sheath formation process can provide insight into the physical mechanism of the arc formation,and thus provide a method for arc energy regulation.In this work,we establish a two-dimensional axisymmetric time-varying model of a medium-voltage DCCB arc when interrupted by high current based on a fluid-chemical model involving 16 kinds of species and 46 collision reactions.The transient distributions of electron number density,positive and negative ion number density,net space charge density,axial electric field,axial potential between electrodes,and near-cathode sheath are obtained from the numerical model.The computational results show that the electron density in the arc column increases,then decreases,and then stabilizes during the near-cathode sheath formation process,and the arc column's diameter gradually becomes wider.The 11.14 V-12.33 V drops along the 17 pm space charge layer away from the cathode(65.5 kV/m-72.5 kV/m)when the current varies from 20 kA-80 kA.The homogeneous external magnetic field has little effect on the distribution of particles in the near-cathode sheath core,but the electron number density at the near-cathode sheath periphery can increase as the magnetic field increases and the homogeneous external magnetic field will lead to arc diffusion.The validity of the numerical model can be proven by comparison with the experiment.
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    Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

    许慧敏高敬格贾鹏英冉俊霞...
    595-601页
    查看更多>>摘要：Plasma jet has extensive application potentials in various fields,which normally operates in a diffuse mode when helium is used as the working gas.However,when less expensive argon is used,the plasma jet often operates in a filamentary mode.Compared to the filamentary mode,the diffuse mode is more desirable for applications.Hence,many efforts have been exerted to accomplish the diffuse mode of the argon plasma jet.In this paper,a novel single-needle argon plasma jet is developed to obtain the diffuse mode.It is found that the plasma jet operates in the filamentary mode when the distance from the needle tip to the central line of the argon stream(d)is short.It transits to the diffuse mode with increasing d.For the diffuse mode,there is always one discharge pulse per voltage cycle,which initiates at the rising edge of the positive voltage.For comparison,the number of discharge pulse increases with an increase in the peak voltage for the filamentary mode.Fast photography reveals that the plasma plume in the filamentary mode results from a guided positive streamer,which propagates in the argon stream.However,the plume in the diffuse mode originates from a branched streamer,which propagates in the interfacial layer between the argon stream and the surrounding air.By optical emission spectroscopy,plasma parameters are investigated for the two discharge modes,which show a similar trend with increasing d.The diffuse mode has lower electron temperature,electron density,vibrational temperature,and gas temperature compared to the filamentary mode.
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    • 维普