共查询到20条相似文献,搜索用时 0 毫秒
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研究了强X射线在金属表面产生的Compton电流时空分布,利用Compton散射公式计算了出射电子动量和微分散射截面随电子出射角的变化关系,发现在光子能量为1 MeV、入射光强为1021 W·m-2的条件下,沿入射光方向形成的Compton电流密度达到107 A·m-2量级。采用1维电动力学模型计算了斜入射的X射线在金属表面产生的Compton电流密度引起的电磁脉冲,结果表明:X射线在单位长度金属辐射产生的磁场强度达到106 A·m-1量级,脉冲宽度为ps量级;电磁脉冲沿X射线反射方向传播,具有良好的定向性。 相似文献
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MAO Ya-Xian Yves Schutz ZHOU Dai-Cui Christophe Furget Gustavo Conesa Balbastre 《中国物理C(英文版)》2010,34(9)
γ+jet events provide a tomographic measurement of the medium formed in heavy ion collisions at LHC energies.Tagging events with a well identified high p T direct photon and measuring the correlation distribution of hadrons emitted oppositely to the photon in ALICE,allows us to determine,with a good approximation,both the jet fragmentation function and the back-to-back azimuthal alignment of the direct photon and the jet.Comparing these two observables measured in pp collisions with the ones measured in AA collisions will reveal the modifications of the jet structure induced by the medium formed in AA collisions and consequently will infer the medium properties. 相似文献
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γ+jet events provide a tomographic measurement of the medium formed in heavy ion collisions at LHC energies.Tagging events with a well identified high p T direct photon and measuring the correlation distribution of hadrons emitted oppositely to the photon in ALICE,allows us to determine,with a good approximation,both the jet fragmentation function and the back-to-back azimuthal alignment of the direct photon and the jet.Comparing these two observables measured in pp collisions with the ones measured in AA collisions will reveal the modifications of the jet structure induced by the medium formed in AA collisions and consequently will infer the medium properties. 相似文献
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研究了强X射线在金属表面产生的Compton电流时空分布,利用Compton散射公式计算了出射电子动量和微分散射截面随电子出射角的变化关系,发现在光子能量为1 MeV、入射光强为1021 W·m-2的条件下,沿入射光方向形成的Compton电流密度达到107 A·m-2量级。采用1维电动力学模型计算了斜入射的X射线在金属表面产生的Compton电流密度引起的电磁脉冲,结果表明:X射线在单位长度金属辐射产生的磁场强度达到106 A·m-1量级,脉冲宽度为ps量级;电磁脉冲沿X射线反射方向传播,具有良好的定向性。 相似文献
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The derivative expansion method has been used to solve the semiclassical kinetic equations of quark-gluon plasma. The nonlinear spatial damping rate, the imaginary part of the wave vector, for the longitudinal secondary color waves in the long wavelength limit has been calculated numerically. 相似文献
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利用QGP中存在德拜屏蔽现象以及高温极限下QGP中夸克的分布函数和色电势,得到QGP中夸克静色电波的辐射功率. 讨论了夸克静色电波的辐射功率与德拜长度λD的关系,有助于利用辐射功率研究德拜屏蔽位势. 相似文献
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Charge-two SU(3) monopoles with minimal symmetry breaking can be generated via Nahm's equations. This paper investigates the detailed structure of such monopoles, through explicit calculation of the energy density, and the norm and discriminant of the Higgs field. Monopoles may be classified according to the maxima and minima of these quantities. 相似文献
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After the concept of turbulent QGP is introduced, the quasilinear equations for turbulent QGP are given. Starting from the field equation, we still treat the collective modes as plasmons that satisfy a transport equation. Using the quasilinear equations for quarks and gluons and the transport equation for plasmons, the collisionless diffusion is discussed. We obtain the quasilinear drag coefficient and the diffusion coefficient. 相似文献
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We raise for the first time the highly important question that the hadronization of partons one by one as assumed in current models for crossover in QCD, contradicts color confinement. A possible mechanism — molecule-like hadron aggregation — is proposed for crossover compatible with color confinement. A toy model to realize this mechanism is constructed. A kind of grape-shape quark gluon plasma (gQGP) is obtained. Pair distribution function for gQGP is calculated which exhibits the character of liquid. 相似文献
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从QGP的动力论方程出发,计及运动检验夸克的色电场扰动,采用微扰方法,并在高温极限下得到QGP中夸克的分布函数和色电势.给出了考虑运动效应在内的德拜长度λD(或屏蔽质量ωD)与温度T的关系,在静态极限下它们与QCD理论相符. 相似文献
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We describe new configurations of electromagnetic (EM) material parameters, the electric permittivity epsilon and magnetic permeability micro, which allow one to construct devices that function as invisible tunnels. These allow EM wave propagation between the regions at the two ends of a tunnel, but the tunnels themselves and the regions they enclose are not detectable to lateral EM observations. Such devices act as wormholes with respect to Maxwell's equations and effectively change the topology of space vis-à-vis EM wave propagation. We suggest several applications, including devices behaving as virtual magnetic monopoles, invisible cables, and scopes for MRI-assisted surgery. 相似文献
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In this note, we investigate the electromagnetic radiation emitted from a revolving point charge in a compact space. If the point charge is circulating with an angular frequency on the -plane at with boundary conditions, and , it emits radiation into the z-direction of . We find that the radiation shows discontinuities as a function of at which a new propagating mode with a different Fourier component appears. For a small radius limit , all the Fourier modes except the zero mode on -plane are killed, but an effect of squeezing the electric field totally enhances the radiation. In the large volume limit , the energy flux of the radiation reduces to the expected Larmor formula. 相似文献
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Ghada M. Sami 《Czechoslovak Journal of Physics》2005,55(5):555-562
The complete time-domain fields due to a vertical magnetic dipole on the surface of two-layer earth model are reexamined when the usually neglected magnetic permeability contrast is considered using the natural-frequency concept. It is shown that for two-layered earth model, where the upper one is permeable, the electromagnetic induction response is modified with respect to the nonpermeable case. The step responses of the induced voltage in a horizontal receiving loop is found to have definite diagnostic features for the ground beneath. These features have been demonstrated by numerical results and illustrated by figures. 相似文献