Dependence of the gyrotron efficiency on the azimuthal index of non-symmetric modes

2014 ◽  
Vol 21 (6) ◽  
pp. 063112
Author(s):  
O. Dumbrajs ◽  
G. S. Nusinovich ◽  
T. M. Antonsen
Keyword(s):  
Azimuthal Index

On the dependence of the efficiency of a 240 GHz high-power gyrotron on the displacement of the electron beam and on the azimuthal index

2014 ◽  
Vol 21 (1) ◽  
pp. 013104 ◽  
Author(s):  
O. Dumbrajs ◽  
K. A. Avramidis ◽  
J. Franck ◽  
J. Jelonnek
Keyword(s):  
Electron Beam ◽  
High Power ◽  
Azimuthal Index

Mode Division Multiplexing of Modes With the Same Azimuthal Index

2012 ◽  
Vol 24 (21) ◽  
pp. 1969-1972 ◽  
Author(s):  
J. Carpenter ◽  
B. C. Thomsen ◽  
T. D. Wilkinson
Keyword(s):  
Azimuthal Index ◽  
Mode Division Multiplexing

Linear stability of rotating Hagen-Poiseuille flow

1981 ◽  
Vol 108 ◽  
pp. 101-125 ◽  
Author(s):  
Fredrick W. Cotton ◽  
Harold Salwen
Keyword(s):  
Reynolds Number ◽  
Angular Velocity ◽  
Linear Stability ◽  
Poiseuille Flow ◽  
Neutral Stability ◽  
Unstable Region ◽  
Azimuthal Index ◽  
Expansion Technique ◽  
Simple Scaling

Linear stability of rotating Hagen-Poiseuille flow has been investigated by an orthonormal expansion technique, confirming results by Pedley and Mackrodt and extending those results to higher values of the wavenumber |α|, the Reynolds number R, and the azimuthal index n. For |α| [gsim ] 2, the unstable region is pushed to considerably higher values of R and the angular velocity, Ω. In this region, the neutral stability curves obey a simple scaling, consistent with the unstable modes being centre modes. For n = 1, individual neutral stability curves have been calculated for several of the low-lying eigenmodes, revealing a complicated coupling between modes which manifests itself in kinks, cusps and loops in the neutral stability curves; points of degeneracy in the R, Ω plane; and branching behaviour on curves which circle a point of degeneracy.

scholarly journals Optical vortex production mediated by azimuthal index of radial polarization

2020 ◽  
Vol 22 (9) ◽  
pp. 095402
Author(s):  
Ignacio Lopez-Quintas ◽  
Warein Holgado ◽  
Rokas Drevinskas ◽  
Peter G Kazansky ◽  
Íñigo J Sola ◽  
...  
Keyword(s):  
Optical Vortex ◽  
Radial Polarization ◽  
Azimuthal Index

Spiral spectrum of multi-modified Bessel–Gaussian Schell beams in non-Kolmogorov turbulence

2016 ◽  
Vol 30 (26) ◽  
pp. 1650193 ◽  
Author(s):  
Yun Zhu ◽  
Yixin Zhang ◽  
Ye Li ◽  
Zhengda Hu
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Short Wavelength ◽  
Beam Waist ◽  
Long Wavelength ◽  
Azimuthal Index ◽  
Received Power ◽  
Rytov Approximation ◽  
Kolmogorov Turbulence ◽  
Optimal Value

On the basis of the Rytov approximation, we investigate the effects of non-Kolmogorov turbulence on the spread of the spiral spectrum and the received power of multi-modified Bessel–Gaussian Schell (MMBGS) beams carrying orbital angular momentum. Numerical results show that the spread of the spiral spectrum increases as the azimuthal index of the source increases and that an optimal value of the beam waist is obtained. We find that the spread of partially coherent MMBGS beams with short wavelength is more robust than that of beams with long wavelength. The complete reverse is true for fully coherent MMBGS beams.

Sign in / Sign up

Export Citation Format

Share Document