Propagation d'une onde électromagnétique à la surface d'un conducteur ou d'un supraconducteur de section circulaire

1981 ◽  
Vol 59 (7) ◽  
pp. 902-913 ◽  
Author(s):  
Georges Fabre ◽  
Alain Wick ◽  
Gérard Zepp
Keyword(s):  
Electromagnetic Wave ◽  
Phase Shift ◽  
Cross Section ◽  
Attenuation Factor ◽  
Circular Cross Section ◽  
Transverse Mode ◽  
Onde Électromagnétique ◽  
Mode Propagation ◽  
Metallic Cylinder ◽  
Analytical Expressions

We are studying the electromagnetic wave (magnetic transverse mode) propagation on the surface of a circular cross section metallic cylinder coated with one or several dielectrics. The method we use allows us to study not only the case of ordinary metals, but also the case of superconductor metals. We determine the precise analytical expressions (for any kind of metal) of characteristic quantities: attenuation factor and phase shift.

Accuracy of Cotton-Mouton polarimetry in sheared toroidal plasma of circular cross-section

Open Physics ◽  
2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Yury Kravtsov ◽  
Janusz Chrzanowski
Keyword(s):  
Simple Model ◽  
Phase Shift ◽  
Perturbation Method ◽  
Cross Section ◽  
Amplitude Ratio ◽  
Circular Cross Section ◽  
Shear Angle ◽  
Tokamak Plasma ◽  
Toroidal Plasma ◽  
Small Shear

AbstractThe Cotton-Mouton effect in sheared plasma with helical magnetic lines is studied on the basis of the equation for complex amplitude ratio (CAR). A simple model for helical magnetic lines in sheared plasma of toroidal configuration is suggested. The equation for CAR in the sheared plasma is solved by perturbation method, using the small shear angle deviations as is characteristic for tokamak plasma. It is shown that the inaccuracy in polarization measurements caused by deviations of the sheared angle amounts to some percentage of the shearless Cotton-Mouton phase shift. One suggested method is to subtract the “sheared” term, which may improve the accuracy of the Cotton-Mouton measurements in the sheared plasma.

Electromagnetic wave propagation in a chiroplasma-filled waveguide

1999 ◽  
Vol 62 (1) ◽  
pp. 87-94 ◽  
Author(s):  
J. GONG
Keyword(s):  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Cross Section ◽  
Electromagnetic Waves ◽  
Electromagnetic Wave Propagation ◽  
Propagation Constant ◽  
Circular Cross Section ◽  
Propagation Characteristics ◽  
Waveguide Modes ◽  
The Family

A dispersion equation is derived for a cylindrical waveguide of circular cross-section partially filled with chiroplasma. The propagation characteristics of electromagnetic waves in the family of waveguide modes are studied. The dispersion curves are given. It is found that the propagation constant changes almost linearly with the chirality admittance for the parameters that we choose, and increases with increasing filled area.

scholarly journals Electric and Magnetic Fields Generated by a Charged Bunch between Parallel Conducting Plates

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
B. Levchenko
Keyword(s):  
Magnetic Fields ◽  
Cross Section ◽  
Infinite Series ◽  
Direct Method ◽  
Charged Particles ◽  
Circular Cross Section ◽  
External Fields ◽  
Trigonometric Functions ◽  
Electric And Magnetic Fields ◽  
Analytical Expressions

Image fields generated by a bunch of charged particles between two parallel perfectly conducting plates are studied in detail. We derive exact analytical expressions for external fields of a charged relativistic bunch with a circular cross-section. Summation of image fields by the direct method invented by Laslett allows the infinite series to be represented in terms of elementary trigonometric functions.

Numerical study of precession of circulating particles in tokamaks

2011 ◽  
Vol 77 (4) ◽  
pp. 559-569 ◽  
Author(s):  
O. S. BURDO ◽  
YA. I. KOLESNICHENKO ◽  
S. SIPILÄ ◽  
YU. V. YAKOVENKO
Keyword(s):  
Cross Section ◽  
Numerical Study ◽  
Circular Cross Section ◽  
Interpolation Formula ◽  
Plasma Pressure ◽  
Precession Frequency ◽  
Magnetic Shear ◽  
Elliptical Cross ◽  
Reasonable Approximation ◽  
Analytical Expressions

AbstractThe toroidal precession of circulating particles in tokamaks is studied numerically. The dependence of the precession frequency on the magnetic shear, the elongation of the plasma cross-section, and plasma pressure is investigated. It is concluded that the analytical expressions for the precession frequency by Kolesnichenko et al. (2003 Phys. Plasmas10, 1449–1457) represent a reasonable approximation for the limit cases of tokamaks with circular cross-section and shearless tokamaks with elliptical cross-section. The precession frequency was calculated for non-circular tokamaks with magnetic shear. Based on the numerical results, an interpolation formula for the precession frequency is proposed.

Ondes électromagnétiques de surface de type HE11

1988 ◽  
Vol 66 (3) ◽  
pp. 233-237
Author(s):  
G. Zepp ◽  
A. Wick ◽  
A. Boubakra ◽  
G. Fabre ◽  
G. Ritoux
Keyword(s):  
Phase Shift ◽  
Attenuation Factor ◽  
Finite Conductivity ◽  
Dielectric Losses ◽  
Microwave Propagation ◽  
Cylindrical Conductor ◽  
Analytical Expressions

We have studied the electromagnetic microwave propagation of the HE11 mode on the surface of a cylindrical conductor coated with a dielectric and embedded in a second dielectric. The present study takes into account the finite conductivity of the metal and dielectric losses for the determination of precise analytical expressions of the attenuation factor and phase shift.

Ondes electromagnétiques de surface en géométrie cylindrique. Les modes de révolution d'ordre supérieur

1985 ◽  
Vol 63 (5) ◽  
pp. 567-573
Author(s):  
G. Zepp ◽  
A. Wick ◽  
G. Ritoux ◽  
G. Fabre ◽  
M. Billaud
Keyword(s):  
Surface Wave ◽  
Attenuation Factor ◽  
High Order ◽  
Cross Sectional ◽  
Electromagnetic Surface Wave ◽  
Metallic Cylinder ◽  
Analytical Expressions ◽  
Wave Modes ◽  
The Revolution

We have studied the revolution electromagnetic surface wave modes of high order (TM, TE) propagating at the surface of a circular cross-sectional metallic cylinder coated with two dielectrics. We have determined precise analytical expressions of attenuation factor and power localization ratio.

SAF file: It's really three dimensional file

2018 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Prof. Dr. Jamal Aziz Mehdi
Keyword(s):  
Cross Section ◽  
Root Canal ◽  
Three Dimensional ◽  
Circular Cross Section ◽  
Circular Motion ◽  
Root Canal Treatment ◽  
Metal Core ◽  
Rotating Blade

The biological objectives of root canal treatment have not changed over the recentdecades, but the methods to attain these goals have been greatly modified. Theintroduction of NiTi rotary files represents a major leap in the development ofendodontic instruments, with a wide variety of sophisticated instruments presentlyavailable (1, 2).Whatever their modification or improvement, all of these instruments have onething in common: they consist of a metal core with some type of rotating blade thatmachines the canal with a circular motion using flutes to carry the dentin chips anddebris coronally. Consequently, all rotary NiTi files will machine the root canal to acylindrical bore with a circular cross-section if the clinician applies them in a strictboring manner

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