1 edition of Ion Density Fluctuations in Plasma and Their Effects on Hot Electron Generation found in the catalog.
Ion Density Fluctuations in Plasma and Their Effects on Hot Electron Generation
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Hot (suprathermal) electron (HE) production driven by instabilities in laser plasma interaction 1 is of paramount interest for the inertial confinement fusion (ICF) science and high-energy-density Author: M. Šmíd, O. Renner, A. Colaitis, V. T. Tikhonchuk, T. Schlegel, F. B. Rosmej. Motivation for the study of hot, dense (~solid density) plasmas has historically been in connection with stellar interiors. In recent years, however, there has been a growing interest in such plasmas due to their relevance to short wavelength (EUV and x-ray) lasers, inertial confinement fusion, and optical harmonic generation. In constrast to the stellar plasmas, these laboratory plasmas are Cited by: 1.
Hot electron generation at steep plasma density gradients has been studied in a previous paper [A. J. Kemp, Y. Sentoku, and M. Tabak, Phys. Rev. Lett. , ()], which identified a mode of hot electron acceleration that is characterized by the formation of low-density shelf in front of the target. calculate the electrical characteristics of a high density plasma reactor. They also reported the IED derived from their model but did not study the effect of process variables on the IED. Finally, Miller and Riley did not calculate the spatiotemporal proﬁles of important sheath variables~sheath thickness, potential, electron, and ion densities!.File Size: KB.
We deﬁne the ion plasma frequency! pi D.n0e 2. 0M//1=, where n0 is the bulk plasma density, and the ion transit frequency! ion D2ˇ=˝ ion D 2ˇ.2eVN s=M/1=s/N. Then,! pi! ion D 3sN 2ˇ n0e 2 0VN s 1=2: (4) We obtain the mean sheath width sNin terms of the mean sheath voltage VN sby using the collisionless Child–Langmuir law NsD 2 3 2e Cited by: In Fig. 5 C and D, we show both the electron and ion density fluctuations in (ω, k) phase space and find that both agree with the dispersion relation of ES whistler waves (W s). Plasma fundamental emission (Fig. 3C) is produced through both coalescence L + W s → T and decay L → T + W s, where T is the transverse by:
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ION DENSITY FLUCTUATIONS IN PLASMA AND THEIR EFFECTS ON HOT ELECTRON GENERATION Martin C Wallace Lieutenant, United States Navy B.S., University of Washington, Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN APPLIED PHYSICS from the NAVAL POSTGRADUATE SCHOOL June Author: Martin C.
Wallace. The simulations show that the heated electron temperature is significantly lowered and the frequency spectrum of the scattered light is broadened by strong ion density fluctuations in the plasma. These density fluctuations are produced when the Raman scattered light undergoes Brillouin : Marty Wallace.
Electron Density Fluctuations in a Plasma: Authors: Salpeter, E. spatial Fourier transform ρ ke for wave vector k of the charge distribution of the electrons in a plasma with particle density n, electron and ion temperatures T and T i and Debye length D.
2 which keeps in phase with the ion charge density fluctuations is also calculated. electron density fluctuations to the electron conductivity. For our purposes we have to use the theorem in a 4-dimensional form, relating space-time fluctuations of the electron density to the electrical conductivity, Y(k, o).
o) establishes a linear response of a plasma to an external electric field in the form of a plane wave. Ion turbulence generated in a CO 2 laser‐heated gas target plasma has been studied using ruby laser Thomson scattering.
Considerable enhancement of the ion fluctuations over the thermal level was observed for two high‐density plasma regimes (short and long density scale lengths). In the short scale length regime the magnitude of density fluctuations, together with temporal and spectral Cited by: 1.
Ono M. et al., Control of H– Ion Density in the Sheet Plasma by an Electron Emitter 3 of the electron density in the circumferential region. At P E ~ mtorr, the peak value of n H- is × m-3 and the ratio of n H-/n e in the circumferential region goes up to over 20%.
In this condition, the ion-neutral and electron. Power density /W m-2 – Plasma source CCP, ICP DBD, micro Electron mean energy /eV 1 – 10 Charge density /m-3 – Gas density /m-3 – Sensing a plasma environment.
Power density /W m-2 –10 4 Plasma source CCP, ICP DBD Electron mean energy /eV 1 –10 Charge density /m-3 10 16 –10 19 10 21 Sensing a plasma environment Gas density. Space plasmas are host to the electrostatic Langmuir waves and a rich range of processes associated with them.
Many of such processes that are of interest in micro-scale plasma physics and magnetosphere-ionosphere physics are open to investigation via incoherent scatter plasma lines—i.e., a pair of resonant peaks in the incoherent scatter radar (ISR) spectrum, symmetrically Cited by: 6.
charged ions, the ion population is adequately described by the ion density. i, [ ] 33 [ ] i ii number of particles, cm or m volume n =nn −−. (1) Besides the ion density, we characterize a plasma by its electron density e and the neutral density n a. nCited by: 4. The electric field vector was calculated from a measurement of the plasma drift velocity in an F -region volume, common for three radars located at Tromso, Kiruna, and Sodankyla.
The CP-1 measurement mode utilised for events allows the calculation of true electron densities in the E region. This density is a function of plasma density, ion energy and ion charge, the latter being determined by the temperature of plasma electrons and by acceleration processes.
(iv) Plasma density, depending mainly on evaporation rate (i.e. on the surface temperature) and expansion. Generation of coherent radial electric fields in plasma by drift-wave turbulence driven by plasma inhomogeneities is ab initio studied using gyro-kinetic particle simulation for conditions of operational tokamaks.
In particular, the effect of the electron-to-ion mass ratio epsilon on the entire evolution of the plasma is : Li, Zhenqian. (cf 9 GeV Au ions) are given in Fig. 2(a) (electron-ion exci-tation) and Fig. 2(b) (ioneion excitation) for a Z T ¼ 10 ion in target.
Such fast ions experience a nearly fully stripped charge state in every situation. Despite that the equilibrium charge is pretty close to the electron-ion case, thus fulﬁlling Bohr cri-terion.
For novel plasma diagnostics, the rf floating probe was revisited. For inducing the self-bias effect, ac bias voltage (∼kilohertz) was applied through a dc blocking capacitor between a probe and a signal generator. The dc self-bias potential was changed not only with ac bias voltages but also with electron temperatures, and therefore, the electron temperature was derived from the variations Cited by: The simulations show that the heated electron temperature is significantly lowered and the frequency spectrum of the scattered light is broadened by strong ion density fluctuations in the plasma.
The line integrated electron density was measured in dependence on the processing parameters rf power (10 W) and total pressure (10 Pa) in comparison between argon and oxygen.
Thereby, the changed distance between the fixed microwave beam axis as well as the sheath edge is taken into consideration using an analytical collision Cited by: 8.
The linear and nonlinear quantum ion-acoustic waves propagating obliquely in two dimensions in superdense, magnetized electron-positron-ion quantum plasma are investigated on the basis of Author: Qamar Haque.
where is the plasma density reduction in the presheath area (is the plasma density at the sheath boundary), is the Bohm velocity, is the electron temperature, is the main ion mass. Here, the sheath boundary is considered to be determined by the Bohm criterion (i.e.
the ions moving from plasma bulk towards the electrode gain the Bohm velocity at the sheath boundary) [10, 11].Cited by: 2. Plasma Physics Laboratory, Princeton University, Princeton, NJ October 7, 1e-mail: [email protected], 2e-mail: [email protected] Abstract A self-consistent 1-D model was developed to study the effect of the electron energy distribution function (EEDF) on power deposition and plasma density profiles in a planar inductively.
The measured electron temperature decay in the afterglow was accurately predicted by a global model. The electron and ion density evolution in the afterglow was also measured near the plasma edge using a Langmuir probe. The plasma density was nearly constant, even over a long afterglow duration of 80 Size: KB.
a, Plasma-electron phase-space (colour bar), transversely averaged ion-density (blue) and longitudinal electric-field (red) profiles after 46 ps. The electric-field spike is due to the shock and Cited by: Ion acoustic waves I Landau damping effects all wave modes in a thermal plasma.
In addition, there are new modes owing their existance to the finite temperature. Consider an ion-electron plasma. The dispersion equation (with ip = ω+ iγ) reads: Such an expansion of (υ .