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Scintillation characterization for multiple incoherent uplink Gaussian beams
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作者 吴武明 宁禹 +2 位作者 马阎星 习锋杰 许晓军 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第9期618-621,共4页
By means of numerical simulations, we analyze the scintillation characterization for multiple incoherent uplink Gaussian beams under weak fluctuations cases. Because truly independent beams are difficult to create, we... By means of numerical simulations, we analyze the scintillation characterization for multiple incoherent uplink Gaussian beams under weak fluctuations cases. Because truly independent beams are difficult to create, we present a more general but approximate model for the multiple of beams traveling through partially correlated paths. This model compares with wave-optics simulations and highlights the reduced correlation coefficient as the beam separation is increased. The scintillation index of three and six incoherent uplink Gaussian beams is also induced. The result shows that the scintillation index decreases with the increase of beams amount and beam separation. When the beams amount and strength of atmospheric turbulence are fixed, the reduction of scintillation index is affected by the ratio of beams separation and the Fried length. The corresponding ohvsical mechanisms for the results are discussed. 展开更多
关键词 scintillation characterization uplink beams correlation coefficient beam separation
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Simple and universal method in designs of high-efficiency diffractive optical elements for spectrum separation and beam concentration 被引量:2
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作者 徐文琪 林冬风 +8 位作者 许信 叶佳声 王新柯 冯胜飞 孙文峰 韩鹏 张岩 孟庆波 杨国桢 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第7期89-95,共7页
Diffractive optical elements(DOEs) with spectrum separation and beam concentration(SSBC) functions have important applications in solar cell systems. With the SSBC DOEs, the sunlight radiation is divided into seve... Diffractive optical elements(DOEs) with spectrum separation and beam concentration(SSBC) functions have important applications in solar cell systems. With the SSBC DOEs, the sunlight radiation is divided into several wave bands so as to be effectively absorbed by photovoltaic materials with different band gaps. A new method is proposed for designing high-efficiency SSBC DOEs, which is physically simple, numerically fast, and universally applicable. The SSBC DOEs are designed by the new design method, and their performances are analyzed by the Fresnel diffraction integral method.The new design method takes two advantages over the previous design method. Firstly, the optical focusing efficiency is heightened by up to 10%. Secondly, focal positions of all the designed wavelengths can be designated arbitrarily and independently. It is believed that the designed SSBC DOEs should have practical applications to solar cell systems. 展开更多
关键词 diffractive optical element spectrum separation and beam concentration optical focusing efficiency solar cell system
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Improvement of Azimuthator Based on Particle Simulation
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作者 赵海龙 王春生 +2 位作者 严禹明 刘洪臣 江滨浩 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第1期71-74,共4页
The azimuthator is an important part of plasma optical mass separation.The existing design for an azimuthator is based on the single particle orbit theory and focused on the movement of ions.In this paper,the particle... The azimuthator is an important part of plasma optical mass separation.The existing design for an azimuthator is based on the single particle orbit theory and focused on the movement of ions.In this paper,the particle simulation method is adopted to study the behavior of plasma crossing an azimuthator.The results show that electrons are bounded at the entrance of the azimuthator and an axial electric field is produced due to the charge separation.In order to better achieve the function of the azimuthator,a cathode is designed to transmit the electrons and to obtain a quasi-neutral plasma beam. 展开更多
关键词 mass separation azimuthator plasma beam PIC
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Research for HIRFL new improvement project
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作者 王义芳 《Chinese Physics C》 SCIE CAS CSCD 2009年第S2期22-25,共4页
According to the newest matching mode between the two cyclotrons at HIRFL, the beam obit properties were researched, especially for the harm of existing ‘over-magnetic shim’ in SSC as well as the trajectory in the n... According to the newest matching mode between the two cyclotrons at HIRFL, the beam obit properties were researched, especially for the harm of existing ‘over-magnetic shim’ in SSC as well as the trajectory in the new mode. The results obtained are encouraging. 展开更多
关键词 isochronous cyclotron over-magnetic shim matching mode beam separation effective rf voltage
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