scholarly journals Compensation of the Effects of Detector Solenoid on the Vertical Beam Orbit in NLC(LCC-0143)

2004 ◽  
Author(s):  
B Parker
Keyword(s):  
Vertical Beam ◽  
Beam Orbit

First measurements of the vertical beam size with an X-ray beam size monitor in SuperKEKB rings

2019 ◽  
Vol 919 ◽  
pp. 1-15
Author(s):  
Emy Mulyani ◽  
John W. Flanagan ◽  
Makoto Tobiyama ◽  
Hitoshi Fukuma ◽  
Hitomi Ikeda ◽  
...  
Keyword(s):  
Beam Size ◽  
X Ray ◽  
Vertical Beam

scholarly journals Adaptive Beamforming Technique for Accurate Vertical Wind Measurements with Multichannel MST Radar

2012 ◽  
Vol 29 (12) ◽  
pp. 1769-1775 ◽  
Author(s):  
Koji Nishimura ◽  
Takuji Nakamura ◽  
Toru Sato ◽  
Kaoru Sato
Keyword(s):  
Signal To Noise Ratio ◽  
Adaptive Beamforming ◽  
Vertical Wind ◽  
Constrained Minimization ◽  
Horizontal Wind ◽  
Signal To Noise ◽  
Mst Radar ◽  
Vertical Beam ◽  
Noise Ratio ◽  
Beamforming Technique

Abstract Aspect-sensitive backscattering of the atmosphere causes a small error in an effective line-of-sight direction in vertical beam observations leading to a serious degradation of vertical wind estimates due to contamination by horizontal wind components. An adaptive beamforming technique for a multichannel mesosphere–stratosphere–troposphere (MST) radar is presented, which makes it possible to measure the vertical wind velocity with higher accuracy by adaptively generating a countersteered reception beam against an off-vertically shifted echo pattern. The technique employs the norm-constrained direction-constrained minimization of power (NC-DCMP) algorithm, which provides not only robustness but also higher accuracy than the basic direction-constrained minimization of power algorithm in realistic conditions. Although the technique decreases the signal-to-noise ratio, the ratio is controlled and bound at a specified level by the norm constraint. In the case that a decrease of −3 dB is acceptable in a vertical beam observation, for which usually a much higher signal-to-noise ratio is obtained than for oblique beams, the maximum contamination is suppressed to even for the most imbalanced aspect sensitivity.

scholarly journals What Should Be Considered When Simulating Doppler Velocities Measured by Ground-Based Weather Radars?

2008 ◽  
Vol 47 (8) ◽  
pp. 2256-2262 ◽  
Author(s):  
Olivier Caumont ◽  
Véronique Ducrocq
Keyword(s):  
High Resolution ◽  
Atmospheric Model ◽  
Physical Processes ◽  
Model Sensitivity ◽  
Sensitivity Experiments ◽  
Weather Radars ◽  
Vertical Beam ◽  
Beam Broadening

Abstract A sophisticated and flexible simulator of Doppler velocities measured by ground-based weather radars is appended to a high-resolution nonhydrostatic atmospheric model. Sensitivity experiments are conducted by using different configurations for each of the physical processes that is modeled by the simulator. It is concluded that neglecting the vertical beam broadening effect or the weighting by reflectivities yields errors of the same order on the simulated reflectivities. Neglecting hydrometeor fall speeds has a much smaller impact. It is also shown that neglecting both the beam broadening effect and the weighting by reflectivities yields errors of the same order as occur when only one of these effects is neglected.

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