Main-beam polarization properties of four-element sequential-rotation arrays with arbitrary radiators

1996 ◽  
Vol 44 (4) ◽  
pp. 515-522 ◽  
Author(s):  
U.R. Kraft
Keyword(s):  
Main Beam ◽  
Beam Polarization

Design of dual-function metasurface based on beam polarization characteristics

2021 ◽  
Vol 117 ◽  
pp. 111199
Author(s):  
Honggang Hao ◽  
Sen Zheng ◽  
Yihao Tang ◽  
Xuehong Ran
Keyword(s):  
Beam Polarization ◽  
Dual Function ◽  
Polarization Characteristics

Study on the Laser Beam Polarization Based on LabVIEW

2021 ◽  
Author(s):  
Xiaoting Sun ◽  
Yongliang Li ◽  
Yingming Zhang ◽  
Chenwen Hu ◽  
Zhiwen Chen
Keyword(s):  
Laser Beam ◽  
Beam Polarization ◽  
Laser Beam Polarization

scholarly journals A New 21-cm Line Survey of the LMC

1984 ◽  
Vol 108 ◽  
pp. 395-396
Author(s):  
K. Rohlfs ◽  
J. Kreitschmann ◽  
J. V. Feitzinger
Keyword(s):  
Noise Temperature ◽  
Beam Width ◽  
Main Beam ◽  
Corrugated Waveguide ◽  
Line Survey ◽  
Single Polarization ◽  
Switching Mode ◽  
Half Power ◽  
Channel Separation ◽  
Made In

The measurements were made in Feb. 1982 with the Parkes 64 m telescope using a corrugated waveguide horn with total half-power beam width of 15′, the first sidelobes being 19 dB down, resulting in an aperture efficiency ηA=0.53±0.007, a main beam efficiency of ηmb=0.80±0.005 and a ratio of source flux to antenna temperature of Γ=0.62±0.1 K/Jy (Murray, priv. comm.). A cooled two channel FET frontend used in the frequency switching mode with Δν = 2 MHz resulted in a system noise temperature at zenith of Tsyst = 40 K for one channel and Tsyst = 50 K for the other. Each frontend channel received a single polarization mode, and this radiation was then further analysed in a 2 × 512 channel autocorrelation spectrometer set at a channel separation of 3.906 KHz corresponding to a velocity resolution of V = 0.824 km s−1. Hanning smoothed this resulted in a σT = 0.05 K for the average of both polarization.

Assessment of stray radiation outside the main beam of the RUM-17 radiological device

1992 ◽  
Vol 26 (3) ◽  
pp. 133-135
Author(s):  
V. N. Vasil'ev ◽  
R. V. El'tsov
Keyword(s):  
Main Beam ◽  
Stray Radiation

Relativistic self-focusing of a rippled laser beam in a plasma

1999 ◽  
Vol 62 (4) ◽  
pp. 389-396 ◽  
Author(s):  
M. V. ASTHANA ◽  
A. GIULIETTI ◽  
DINESH VARSHNEY ◽  
M. S. SODHA
Keyword(s):  
Refractive Index ◽  
Laser Beam ◽  
The Self ◽  
Laser Beams ◽  
Radial Dependence ◽  
Main Beam ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Saturation Effects ◽  
Paraxial Ray

This paper presents an analysis of the relativistic self-focusing of a rippled Gaussian laser beam in a plasma. Considering the nonlinearity as arising owing to relativistic variation of mass, and following the WKB and paraxial-ray approximations, the phenomenon of self-focusing of rippled laser beams is studied for arbitrary magnitude of nonlinearity. Pandey et al. [Phys. Fluids82, 1221 (1990)] have shown that a small ripple on the axis of the main beam grows very rapidly with distance of propagation as compared with the self-focusing of the main beam. Based on this analogy, we have analysed relativistic self-focusing of rippled beams in plasmas. The relativistic intensities with saturation effects of nonlinearity allow the nonlinear refractive index in the paraxial regime to have a slower radial dependence, and thus the ripple extracts relatively less energy from its neighbourhood.

In-Beam Polarization of Light Radioactive Nuclei Using Grazing Surface Scattering

1995 ◽  
Vol 75 (4) ◽  
pp. 641-644 ◽  
Author(s):  
W. Vanderpoorten ◽  
J. Camps ◽  
P. De Moor ◽  
M. Gaelens ◽  
P. Schuurmans ◽  
...  
Keyword(s):  
Surface Scattering ◽  
Beam Polarization ◽  
Polarization Of Light
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