共查询到20条相似文献,搜索用时 15 毫秒
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The dynamic characteristic and effects of plasma play an important role in film growth process of pulsed laser deposition (PLD). Based on numerical hydrodynamic modeling, supposed the laser radiation and partial ionization of the plasma as a dynamic source, we deduce a set of new plasma expansion dynamics equations. Based on which, as an example of carbon target, using finite difference method, the plasma flow dynamics evolvement in vacuum is investigated. Our results show the dynamic partial ionization increases the expansion in all directions, which changes into a new dynamic source for plasma expansion. In the axial direction, because of the collisional interactions between particles, the plume density peak is in the vicinity of the target surface and the acceleration of plasma occurs mainly near the target surface too. In the transverse direction, the plume peak is not near the target, but at the surface. The space expansion distance is far less than the axial direction because there is no high initial velocity component in this direction. The predictions of the plasma expansion action based on the proposed dynamics source assumption are found to be in agreement with the experimental observation. 相似文献
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Reflection of thermal atoms by a pulsed standing wave 总被引:1,自引:0,他引:1
P. Ryytty M. Kaivola 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,12(3):415-423
Reflection of thermal atoms by a pulsed standing wave with a duration in the nanosecond range is studied. The momentum distribution
of the reflected atoms is determined by calculations based on the adiabatic atom-photon interactions. It is shown that with
a proper choice of the field intensity and the pulse duration the standing-wave pattern functions as a row of independent
atom mirrors. At an optimum choice of the parameter values, the fraction of the elastically reflected atoms is more than 20%.
Furthermore, we show that the pulsed standing-wave mirror can be used to manipulate their final momentum distribution. When
using laser pulses with an intensity of several tens of MW/cm2, tens of thousands of atoms can be reflected by a single laser pulse.
Received 3 December 1999 and Received in final form 25 April 2000 相似文献
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V. B. Gil'denburg A. A. Zalezsky V. E. Semenov 《Radiophysics and Quantum Electronics》1995,38(10):645-651
We investigate a stationary one-dimensional ionization wave produced in a cold gas by an alternating electric field of frequency (the field is parallel to the direction of propagation of the wave). Primary attention is given to specific features associated with the existence of a plasma resonance transition region at the front of the wave, where the electric-field amplitude and, therefore, the collisional ionization rate of the gas have a pronounced maximum at low electron-collision frequencies . We investigate analytically and calculate numerically the parameters of the wave, which is described by a nonlinear diffusion equation. It is shown that a made of ultrafast discharge propagation with ionization wave velocity V for /0 can be established in the gas due to resonance effects even if the external electric field has amplitude far below breakdown.Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 38, No. 10, pp. 991–1000, October, 1995. 相似文献
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使用粒子激光图像测速技术对亚微秒脉冲激励表面介质阻挡放电激励器连续产生诱导漩涡进行了实验研究, 给出了包含脉冲重复频率和漩涡频率的双频率激励模式的具体形式. 实验过程中出现了原发型与继发型两类示踪粒子空白区, 前者由放电释热的微爆炸作用造成, 使得诱导流动远离壁面, 能够减小壁面摩擦阻力的作用; 以暴露电极左侧继发型空白区被完全吹除作为重复启动激励的临界点. 为提高控制效果应采用尽可能高的脉冲重复频率, 漩涡时间内脉冲数量应大于10, 最大诱导速度随脉冲数量增大而增大, 但动量传递效率降低. 使用亚微秒脉冲激励具备释热、体积力两种作用机理.
关键词:
双频率亚微秒脉冲
表面介质阻挡放电
连续漩涡 相似文献
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The resonant absorption of a plasma surface wave is supposed to be an important and efficient mechanism of power deposition for a surface wave plasma source. In this paper, by using the particle-in-cell method and Monte Carlo simulation, the resonance absorption mechanism is investigated. Simulation results demonstrate the existence of surface wave resonance and show the high efficiency of heating electrons. The positions of resonant points, the resonance width and the spatio-temporal evolution of the resonant electric field are presented, which accord well with the theoretical results. The paper also discusses the effect of pressure on the resonance electric field and the plasma density. 相似文献
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从系统设计的角度出发,提出了利用数字频率合成技术和功率增益自动控制技术稳定等离子体激励源的频率和功率,从而降低天线噪声、提高等离子体天线性能。实验结果证明了此方法可行性。 相似文献
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The possibility of semiconductor surface activation, which shows up as a long-term increase in the adsorption capacity in response to a short exposure to a pulsed magnetic field, is demonstrated for the first time. Magnetic-field-induced surface activation is studied on silicon, germanium, and gallium arsenide crystals. The effect revealed extends the capabilities of thin-film growth on the semiconductor surface. 相似文献
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Thermoelastic wave induced by pulsed laser heating 总被引:6,自引:0,他引:6
In this work, a generalized solution for the thermoelastic plane wave in a semi-infinite solid induced by pulsed laser heating
is developed. The solution takes into account the non-Fourier effect in heat conduction and the coupling effect between temperature
and strain rate, which play significant roles in ultrashort pulsed laser heating. Based on this solution, calculations are
conducted to study stress waves induced by nano-, pico-, and femtosecond laser pulses. It is found that with the same maximum
surface temperature increase, a shorter pulsed laser induces a much stronger stress wave. The non-Fourier effect causes a
higher surface temperature increase, but a weaker stress wave. Also, for the first time, it is found that a second stress
wave is formed and propagates with the same speed as the thermal wave. The surface displacement accompanying thermal expansion
shows a substantial time delay to the femtosecond laser pulse. On the contrary, surface displacement and heating occur simultaneously
in nano- and picosecond laser heating. In femtosecond laser heating, results show that the coupling effect strongly attenuates
the stress wave and extends the duration of the stress wave. This may explain the minimal damage in ultrashort laser materials
processing.
Received: 23 May 2000 / Accepted: 26 May 2000 / Published online: 20 September 2000 相似文献
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A. F. Aleksandrov D. N. Vaulin Ren Qi V. A. Chernikov 《Moscow University Physics Bulletin》2012,67(3):312-316
The results of spectral investigations of the electron density and excitation temperature in the plasma of a pulsed discharge propagating over a liquid surface are presented. 相似文献
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The process of ionization of a two-dimensional quantum dot by the field of a linearly polarized electromagnetic wave is studied. For the first time, analytic expressions for the ionization rate and partial probabilities of the process per unit time are obtained. The dependence of the probability of the process on the parameters of the confining potential and the Keldysh parameter are studied. The results of the work are compared with the earlier results on one- and three-dimensional nanostructures with a short-range potential. 相似文献
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A. V. Kudrin L. E. Kurina E. Yu. Petrov 《Journal of Experimental and Theoretical Physics》2001,92(6):969-978
An investigations is made of the steady-state structure of a plasma inhomogeneity arising as a result of high-frequency heating and additional ionization of a background magnetized plasma by the near-zone field of a magnetic-type source (ring electric current). It is assumed that the source axis is parallel to an external magnetic field; the source frequency belongs in the low hybrid band. The main attention is focused on the particular case (important for possible applications) when the characteristic longitudinal and transverse scales of density distribution considerably exceed the corresponding scales of distribution of the electron temperature and of the source field. Simplified equations for the near-zone field of the source, the electron temperature, and the plasma density are written for this particular case. Based on the numerical solution of these equations, steady-state distributions of plasma parameters in the formed plasma inhomogeneity are found. It is demonstrated that a plasma inhomogeneity proves to be markedly extended along the external magnetic field. It is found that, for the values of the source current that are attainable under the conditions of active ionospheric and model laboratory experiments, the maximum plasma density in a nonuniform plasma may appreciably exceed the background value. 相似文献
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N. Mujica R. Wunenburger S. Fauve 《The European Physical Journal B - Condensed Matter and Complex Systems》2003,33(2):209-213
We report an experimental study of the scattering of a sound wave of frequency f by a surface vibrating at frequency F. Both the Doppler shift at the vibrating surface and acoustic nonlinearities in the bulk of the fluid, generate the frequencies
f±nF (n integer) in the spectrum of the scattered wave. We show that these two contributions can be separated because they scale
differently with respect to the vibration frequency and to the distance between the vibrating scatterer and the detector.
We determine the parameter ranges in which one or the other mechanism dominates and present quantitative studies of these
two regimes.
Received 2 December 2002 / Received in final form 27 March 2003 Published online 4 June 2003
RID="a"
ID="a"e-mail: fauve@physique.ens.fr
RID="b"
ID="b"UMR 8550 相似文献
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《Current Applied Physics》2015,15(3):174-179
The acceleration of electrons by a plasma wave in the presence of density ripple in plasma has been investigated. Plasma density ripple can excite higher harmonics of different phase velocities of the fundamental plasma wave. The combined role of the different harmonics of the plasma wave contributes significantly in electrons energy gain during acceleration by the fundamental plasma wave. Our calculation shows that the plasma electrons gain considerable energy during the acceleration by the plasma waves in the presence of a density ripple in plasma. The initial electron energy and the ripple density play an important role for the acceleration of an electron. 相似文献
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H. Akou 《等离子体物理论文集》2021,61(1):e202000149
The excitation of upper-hybrid wake electrostatic wave by interaction of an extraordinary Gaussian wave propagating perpendicular to the external magnetic field in a cold homogeneous plasma is investigated using magnetohydrodynamics theory. The plasma oscillations can be excited due to the charge separation appeared by the ponderomotive force of the electromagnetic wave whose frequency is considered in the lower pass band. By obtaining the equation governing the plasma wake, the dependency of the wake amplitude on the physical parameters is studied. It is observed that larger wake oscillation takes place when the pulse length is approximately close to 3λp/π and the X-wave frequency is greater than ωp, which means that the phase velocity is less than the speed of light in vacuum (vp < c). 相似文献