Performance of a remote steering antenna for ECRH/ECCD applications in ITER using a four-wall corrugated square waveguide
W. KasparekG. GantenbeinB. PlaumR. WackerA. V. ChirkovГ. Г. ДенисовS. V. KuzikovΚ. OhkuboFrank HollmannD. Wagner
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For the upper electron cyclotron wave launcher on the international thermonuclear experimental reactor (ITER), the use of a 'remote steering antenna' based on the imaging properties of square waveguides is planned. To characterize launchers of this type, low-power experiments on a four-side corrugated square waveguide, with a scanning mirror at the input of the waveguide, were performed in the frequency range 140–160 GHz.It is shown that elliptical polarization, which is necessary for the electron cyclotron current drive (ECCD), can be transmitted without depolarization and that the usable steering range of the antenna is at least 20°.Low-power measurements demonstrate that mitre bends can be integrated into the waveguide, practically without extra loss. Detailed calorimetric measurements for this set-up confirm this statement for the polarization perpendicular to the scanning plane, whereas excess loss is measured for the parallel polarization. Various modifications of mitre bends are investigated and results are discussed.Keywords:
Square (algebra)
Waveguide
Based on the investigation of the plant species and configuration of the city squares within Guangzhou(such as the Guangzhou east railway station square,the beautiful city square,the generalissimo mansion square,the Haizhu square,Heroes square,and the civic square),the composition of the plant species was summarized.Plant configuration was evaluated.Problems existed were analyzed.Countermeasures were put forward.
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Journal Article Cranbourne river: Trafalgar square fountains Get access Walter E. Gawthorp Walter E. Gawthorp 14, Trafalgar Square, and late of Long Acre Search for other works by this author on: Oxford Academic Google Scholar Notes and Queries, Volume 156, Issue 14, 6 April 1929, Pages 250–251, https://doi.org/10.1093/nq/156.14.250e Published: 06 April 1929
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Optically recorded Fresnel zone plates have proper spatial frequency characteristics for use as a laser scanner. Such grating scanners can easily be made and can scan over large cone angles with, however, severe aberrations of the diffracted laser beam at large deflection angles. Optically recorded Fresnel zone plates for laser beam scanning are investigated, and their aberration properties are analyzed. A method for removing the wavefront error caused by this type of zone plate is discussed, and the feasibility of the method is demonstrated.
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As a essential part of urban greenbelts,urban square is one of the most important stages of townsman.It discusses the inbeing of people-oriented,analyzes the problems at present of urban square and the demands of the times,expoundes the requirements of men when they act on the square,finally it advances principles to people-oriented design in urban square based on the realization of men's progress.
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According to the dangers in square scenery,it analyzes the dangers and harmful factors of square layout square laying,square environment and square install action,so as to bring safety project into designing,and makes the real design of people-orientation.
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In a previous paper by Cebrian et al. [Opt. Eng.53, 092006 (2014)OPEGAR0091-328610.1117/1.OE.53.9.092006], the knife-edge interferometer (KEI) was used for testing lenses with a collimated beam illuminating the lens. In this paper, a 2f scheme is used to test lenses, eliminating the use of a collimation beam, and testing, for the first time, concave reflecting (spherical and parabolic) surfaces at the center of curvature with KEI.
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The city square,being as a city's historic-cultural and development symbol,and also being as an important part of the urban landscape,has become the concern of the public.But in many places in China there are some shortcomings in the design positioning of city square.This paper expounds the importance of the design positioning of city square and some theories of design positioning of city square,and taking Shanxi Road Citizen Square of Nanjing City as an example,introduces in detail the design positioning of city square.
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