Plasma sheath around a floating cylindrical antenna at high power

1970 ◽  
Vol 48 (16) ◽  
pp. 1882-1893 ◽  
Author(s):  
J. Rubinstein ◽  
J. G. Laframboise
Keyword(s):  
Radiation Field ◽  
High Power ◽  
Coulomb Potential ◽  
Plasma Sheath ◽  
Numerical Calculations ◽  
High Frequencies ◽  
Cylindrical Antenna ◽  
Self Consistent ◽  
Antenna Impedance

At high frequencies the time-averaged effect of the radiation field near an antenna is to add the term a2E2(r) to the Coulomb potential. Its inclusion in a self-consistent Poisson–Vlasov analysis shows that a high power antenna may acquire a strong positive floating potential.Electron, ion, and potential profiles are obtained from numerical calculations and the effect on antenna impedance is discussed. Time taken to acquire positive potentials is estimated.

Influence of peak current on substrate plasma sheath properties of Ti films deposited by high-power pulsed magnetron sputtering

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940016
Author(s):  
C. Z. Chen ◽  
D. L. Ma ◽  
N. Huang ◽  
Y. X. Leng
Keyword(s):  
Magnetron Sputtering ◽  
Equivalent Circuit ◽  
Plasma Density ◽  
High Power ◽  
Equivalent Circuit Model ◽  
Film Structure ◽  
Circuit Model ◽  
Plasma Sheath ◽  
Peak Current ◽  
Pulsed Magnetron

For film deposition, the substrate sheath properties, such as the plasma density, ion-to-atom ratios around the substrate, are more important for the film structure. In this paper, titanium thin films were deposited on grounded substrates by high-power pulsed magnetron sputtering (HPPMS) with the peak current in the range of 113–185 A. A simple and new equivalent circuit model of the sheath was established to study the plasma density around the substrate sheath. The Ti ion-to-atom ratios near substrate were studied by optical emission spectroscopy (OES), and the film structure was detected by transmission electron microscopy (TEM). The results showed that the calculated plasma density was from 0.8 × 10[Formula: see text] to 1.4 × 10[Formula: see text] m[Formula: see text] at different peak current. These were consistent with the results measured by a modified one-grid ion collector using saturation current probe method, which proved our proposed equivalent circuit model was correct. The Ti ion-to-atom ratios around the substrate were estimated at about 24%–62%. The plasma density and ion to atom ratio around the substrate increased with the peak current, and this could lead to a higher film crystallization and preference growth on Ti (101) and (100).

scholarly journals Spectrophotometric studies of Planetary Nebulae with [WR] central stars

1997 ◽  
Vol 180 ◽  
pp. 269-269
Author(s):  
M. Peña ◽  
G. Stasińska ◽  
C. Esteban ◽  
R. Kingsburgh ◽  
L. Koesterke ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Radiation Field ◽  
Planetary Nebulae ◽  
Model Atmosphere ◽  
The Other ◽  
Self Consistent ◽  
First Results ◽  
Photoionization Model ◽  
Central Stars

We present the first results of a project on PNe with [WR] nuclei whose aim is twofold. One is to search for possible spatial abundance variations inside the nebula. The other is to check whether, for each object, one can build a self-consistent photoionization model (with the code PHOTO, Stasińska 1990, A&AS, 83, 501) using, as an input, the ionizing radiation field from an expanding model atmosphere reproducing the observed stellar lines of He, C and O (Koesterke et al., these proceedings).

A Parallel Algorithm for Conserving Approximation of Lattice Models Having Both Interactions and Disorder

2001 ◽  
Vol 15 (24n25) ◽  
pp. 3270-3278
Author(s):  
B. Buhrow ◽  
J. J. Deisz
Keyword(s):  
Perturbation Theory ◽  
Hubbard Model ◽  
Specific Heat ◽  
Parallel Algorithm ◽  
Lattice Models ◽  
Numerical Calculations ◽  
Self Consistent ◽  
Attractive Hubbard Model ◽  
Local Pairing ◽  
Diagonal Disorder

We present a parallel algorithm for numerical calculations for electronic lattice models with interactions and disorder. In this scheme, diagonal and off-diagonal disorder are treated exactly per disorder configuration and interaction effects are evaluated using conserving approximations based on self-consistent perturbation theory. We demonstrate this method by calculating second-order corrections to the local pairing amplitude and specific heat for the attractive Hubbard model.

Static-Stiffness Analysis of a Roll-Bending Machine of High-Power

2013 ◽  
Vol 581 ◽  
pp. 125-130
Author(s):  
Attila Szilágyi ◽  
György Takács ◽  
Balázs Barna
Keyword(s):  
High Power ◽  
Numerical Calculations ◽  
Project Work ◽  
Static Stiffness ◽  
Stiffness Analysis ◽  
Roll Bending

This article is a brief summary of an R&D project work that includes the improvement of a roll-bending machine with high power. The emphasis was laid on achieving an increased static stiffness of the equipment. In the followings the numerical calculations and the simulations are presented.

Development of array device for power measurement of high power microwave radiation field

2010 ◽  
Vol 22 (4) ◽  
pp. 883-886
Author(s):  
张治强 Zhang Zhiqiang ◽  
王宏军 Wang Hongjun ◽  
张黎军 Zhang Lijun ◽  
张余川 Zhang Yuchuan
Keyword(s):  
Radiation Field ◽  
Microwave Radiation ◽  
High Power ◽  
Power Measurement ◽  
High Power Microwave ◽  
Power Microwave

scholarly journals Numerical simulation of the effective input of laser energy into a cavity through a hole

1999 ◽  
Vol 17 (4) ◽  
pp. 785-791
Author(s):  
I.G. LEBO ◽  
S.YU. GUS'KOV ◽  
V.V. DEMCHENKO ◽  
V.V. NIKISHIN ◽  
V.F. TISHKIN ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laser Pulse ◽  
Laser Beam ◽  
High Power ◽  
Laser Energy ◽  
Numerical Calculations ◽  
High Power Laser ◽  
Power Laser ◽  
High Power Laser Pulse

A possibility of input of high-power laser pulse into a cavity through a hole was studied by means of 2D numerical calculations. Such tasks appear in view of investigation of the effective targets with internal input of energy (Bessarab et al. 1992; Basov et al. 1998), “cannon-ball” (Hogan 1989), “Greenhouse” targets (Gus'kov et al. 1995).We have used two Euler codes “NUTCY” and “FAKEL” to model the problems of laser beam input into a cavity through the holes.

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