共查询到20条相似文献,搜索用时 15 毫秒
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K.H. Finken 《Journal of Quantitative Spectroscopy & Radiative Transfer》1979,22(4):397-400
It is demonstrated that a magnetic field determination is possible by spectroscopic measurements for a dense plasma at an electron density of 1018 cm-3 produced in a z-pinch discharge. For this purpose, polarization effects on the Hα-line are analysed. The emission line itself cannot be used for the investigation because, at these high densities, its half-width is of the order of 100 Å. It is found, however, that the field strength can be deduced from the absorption line properties. 相似文献
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We measure the expansion of an ultracold plasma across the field lines of a uniform magnetic field. We image the ion distribution by extracting the ions with a high-voltage pulse onto a position-sensitive detector. Early in the lifetime of the plasma (<20 micros), the size of the image is dominated by the time-of-flight Coulomb explosion of the dense ion cloud. For later times, we measure the 2D Gaussian width of the ion image, obtaining the transverse expansion velocity as a function of the magnetic field (up to 70 G). We observe that the expansion velocity scales as B(-1/2), explained by a nonlinear ambipolar diffusion model with anisotropic diffusion in two different directions. 相似文献
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A self-similar plasma model is used to investigate the heating and the confinement of laser-produced plasmas in a strong magnetic field. Using the Runge-Kutta method, numerical values of plasma temperature, displacement, absorption and velocity as a function of time are obtained for a wide range of experimental conditions using a high power pulsed CO2 laser incident on a solid target. 相似文献
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G. A. Shul'man 《Russian Physics Journal》1974,17(10):1355-1358
The chemical potential of a relativistic and an ultrarelativistic electron gas and the energy of an ultrarelativistic electron gas at T = 0 are expressed analytically as functions of the magnetic field. The possible application of these expressions to the investigation of super-compressed matter in the presence of superstrong magnetic fields is discussed. 相似文献
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The equilibria of plasma in a dipolar magnetic field under the gravitational influence of a massive body (a star or black hole) and a self gravitating plasma are considered. Analytical solutions are found that can be useful for understanding the physics of plasma flows in accretion disks and star formation. 相似文献
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T. A. El-Khalafawy A. M. Youssef V. V. Demchenko V. G. Diatlov 《Physics letters. A》1972,40(5):409-411
It has been demonstrated that a small-scale drift instability occurs in a theta-pinch with a superimposed azimuthal magnetic field, subsequently resulting in turbulization of oscillations andheating of the plasma. The data obtained agree well with the available theoretical models. 相似文献
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The operating principles, design, and characteristics of an ion source with a cold magnetron cathode and magnetic plasma compression are described. The source is intended for the injector of a linear proton accelerator. 相似文献
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The effect of a longitudinal magnetic field on the electrical and optical properties of negative glow and the Faraday dark space of a glow discharge in helium is experimentally studied at a discharge current Jd=11 mA and a pressure of 100–150 Pa in the discharge chamber. An experimental setup is designed and described. A longitudinal electric field is found to be absent in the region of negative glow and the Faraday dark space in both the presence and the absence of the magnetic field. The magnetic field is shown to decrease the voltage of the glow discharge and to increase the total discharge luminosity and the intensities of some spectral lines by a factor of 10–12. The experimental results are explained. 相似文献