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Large Aperture Mirror


358. New technology for lightweight large primary mirror of theodolite

Tan, Fan-Jiao (Changchun Institute of Optics and Fine Mechanics, Chinese Acad. of Sci.); Qiao, Yan-Feng; Li, Yao-Bin; Gao, Hui-Bin Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering, v 16, n 1, January, 2008, p 22-28 Language: Chinese

ISSN: 1004-924X CODEN: GJGOF4

Publisher: Chinese Academy of Sciences


Abstract: In order to optimize conceptual lightweight structure for the primary mirror of a 2 m aperture theodolite, the conceptual lightweight structure was optimized with Finite Element Algorithm(FEA) topology according to minimum flexibility principle. From the computation result, major remain radial is close for different mirror materials, in which the outside radial is 889.5 mm, the inner of 235 mm, and the middle radial places are 720-730 mm and 620-630 mm. The mean lightweight rate of non circular type is about 70%, and the circular is above 50%. From optimization data of Zerodur mirror, natural frequency comes to 300 Hz, and the location reaction force declines largely according to a traditional mirror. Comparing the deformation of SiC mirror surface with uniform lightweight structure, the displacements of non uniform circular structure and closed hexagon structure are about (0.42-0.45) × 10-5 mm, while the uniform circular and open hexagon are (0.58-0.59) × 10-5 mm. The natural frequency of uniform distribution circular is 1200 Hz, while the non uniform one is 1680 Hz, and the hexagon is 1620-1670 Hz. The results show that for the gravity load distribution on mirror surface is nonlinear, and the distribution of lightweight structure is uniform, which is advantageous to the control of mirror surface deformation and natural frequency, and the design of lightweight structure. (7 refs.)
359. Optical design of very large four-mirror systems

Zhu, Lirong (Institute of Modern Optical Technology, Soochow University); Shen, Weimin Source: Key Engineering Materials, v 364-366 II, 2008, p 1231-1236

ISSN: 1013-9826 CODEN: KEMAEY

Publisher: Trans Tech Publications Ltd


Abstract: Four-mirror systems with a very large aperture and a long focal length were investigated and designed. Their design idea is given. Through the derivation of primary aberration formula, the aberration properties were analyzed and discussed, and the method to determine its initial structure is reported. As examples, two four-mirror systems with spherical and parabolic primary mirror, 100m focal length, and 10m entrance pupil were optimally designed. Their imaging quality approaches diffraction limit within field of view of 0.4 and 0.5 degrees respectively. (7 refs.)
360. Design of large aperture mirror support and its stability

Fu, Xue-Nong (Institute of System Engineering, China Academy of Engineering Physics); Chen, Xiao-Juan; Wu, Wen-Kai; Xu, Yuan-Li Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering, v 16, n 2, February, 2008, p 179-183 Language: Chinese

ISSN: 1004-924X CODEN: GJGOF4

Publisher: Chinese Academy of Sciences


Abstract: On basis of the schemes of adjustable kinematic mounts and integrative design, a large aperture mirror support for the target area of Inertial Confinement Fusion (ICF) facility was analyzed to solve some problems on stability, exact constrain, fast installation and easy adjustment. Then the structure characteristic and mechanical analysis were introduced, and the experiment of sample confirms feasibility of the design. Analysis and experimental results indicate that the sample satisfies the requirement for system's stability, the accuracy of orientation and relocation of the mount is less than 10μrad. (5 refs.)
361. Optical design of large aperture segmented mirror system

Deng, Jian (Research Center for Space Optical Engineering, Harbin Institute of Technology); Zhang, Wei; Long, Fu-Nian Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering, v 16, n 1, January, 2008, p 29-34 Language: Chinese

ISSN: 1004-924X CODEN: GJGOF4

Publisher: Chinese Academy of Sciences


Abstract: Based on balancing aberration of Three Mirror Anastigmatic (TMA), a kind of segmented optical design way with long focal length and wide Field of View (FOV) was introduced. Segmented system was completely simulated and analyzed using Fresnel diffraction integral for the exit pupil wavefront. Considering on the error analysis and distribution of non sequential surface, the initial design was modified. In order to balance the aberration and increase the system redundancy, the high order asphere and bigger aperture system were optimized. A segmented synthetic aperture optical system with segmented primary mirror was designed in EFL of 44 m, f/8, FOV of 0.6° × 0.06°. By iterating the design scheme and analyzing error, a good design is obtained. (15 refs.)
362. Optical system design with high resolution and large field of view for the remote sensor

Chang, Jun (Beijing Institute of Technology, School of Information Science); Weng, Zhi-Cheng; Wang, Yong-Tian; Cheng, De-Wen; Jiang, Hui-Lin Source: Key Engineering Materials, v 364-366 I, 2008, p 550-554

ISSN: 1013-9826 CODEN: KEMAEY

Publisher: Trans Tech Publications Ltd


Abstract: In this paper, we are presenting a design method and its results for a space optical system with high resolution and wide field of view. This optical system can be used both in infrared and visible configurations. The designing of this system is based on an on-axis three-mirror anastigmatic (TMA) system. Here the on-axis concept allows wide field of view (FOV) enabling a diversity of designs available for the Multi-Object Spectrometer instruments optimized for low scattered and low emissive light. The available FOVs are upto 1° in both spectrum ranges, whereas the available aperture range is F/15 - F/10. The final optical system is a three-mirror telescope with two on-axis and one off-axis segment and its resolution is 0.3m or even lower. The distinguished feature of this design is that it maintains diffraction-limited image at wide wavelengths. The technological developments in the field of computer generated shaping of large-sized optical surface details with diffraction-limited imagery have opened new avenues towards the designing techniques. Such techniques permit us to expand these technological opportunities to fabricate the aspherical off-axis mirrors for a complex configuration. (8 refs.)
363. A refract-reflect telescope with meniscus corrector

Kang, Yu-Si (Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences); Liu, Wei-Qi; Feng, Rui Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering, v 16, n 2, February, 2008, p 215-220 Language: Chinese

ISSN: 1004-924X CODEN: GJGOF4

Publisher: Chinese Academy of Sciences


Abstract: By making the aspheric surface into spheric in traditional refract-reflect system, a novel system for refract-reflect telescopes with a meniscus corrector was proposed. A meniscus corrector was laid between primary and secondary mirrors, instead of a front large aperture lens to form double pass optical path and play a role of two lenses. The corrector diameter is 1/3 that of the effective aperture, which shows its light weight and simple supporting structure. The optical properties of the telescope are described in field of view of 2°, relative aperture of F # 7, obscuring ratio of 0.33, MTF diffraction limit of 0.40@ 70 pl/mm and wavelength range of 400-1100 nm. After correcting, the total MTF is more than 0.35@ 70 pl/mm. The system improves the optical element manufacture, assembly tolerance is two times of the traditional R C structure. (8 refs.)
364. Wide band focusing x-ray spectrograph with spatial resolution

Pikuz, S.A. (Cornell University); Douglass, J.D.; Shelkovenko, T.A.; Sinars, D.B.; Hammer, D.A. Source: Review of Scientific Instruments, v 79, n 1, , 2008, p 013106

ISSN: 0034-6748 CODEN: RSINAK

Publisher: American Institute of Physics Inc.


Abstract: A new, wide spectral bandwidth x-ray spectrograph, the wide-bandwidth focusing spectrograph with spatial resolution (WB-FSSR), based on spherically bent mica crystals, is described. The wide bandwidth is achieved by combining three crystals to form a large aperture dispersive element. Since the WB-FSSR covers a wide spectral band, it is very convenient for application as a routine diagnostic tool in experiments in which the desired spectral coverage is different from one test to the next. The WB-FSSR has been tested in imploding wire-array experiments on a 1 MA pulsed power machine, and x-ray spectra were recorded in the 1-20 A spectral band using different orders of mica crystal reflection. Using a two mirror-symmetrically placed WB-FSSR configuration, it was also possible to distinguish between a real spectral shift and a shift of recorded spectral lines caused by the spatial distribution of the radiating plasma. A spectral resolution of about 2000 was demonstrated and a spatial resolution of [similar to] 100 μm was achieved in the spectral band of 5-10 A in second order of mica reflection. A simple method of numerical analysis of spectrograph capability is proposed. © 2008 American Institute of Physics. (28 refs.)
365. Possible improvements to a remote steering launcher for localized electron cyclotron current drive

Henderson, M.A. (CRPP, EURATOM-Confederation Suisse, EPFL); Moeller, C.P. Source: Fusion Science and Technology, v 53, n 1, January, 2008, p 220-236

ISSN: 1536-1055 CODEN: FSTUCY

Publisher: American Nuclear Society


Abstract: The remote steering (RS) system (C P. Moeller, Proc. 23rd Int. Conf. Infrared and Millimeter Waves, September 7-11, 1998, University of Essex, pp. 116-118) provides a method of steering a millimeter-wave beam for electron cyclotron heating (ECH) and current drive (CD) applications without having moveable mirrors close to the plasma. The input beam is coupled into a square corrugated waveguide having a length such that the phase and amplitude profile of the input beam is repeated at the waveguide output. In the most basic implementation, by injecting the input beam at an angle relative to the waveguide axis, the output beam is radiated at that same angle. The steering range (typically to ±12 deg) and the focusing ability are strongly limited because of the restricted space for the launcher in a fusion device, which results in a large deposition profile in the plasma. However, the waveguide and optical arrangement can be modified to either increase the steering range and/or focus the RS system. For example, if a converging beam is injected into the waveguide, the output beam's waist will be projected far from the waveguide aperture. Likewise, a tapered square waveguide can be used to increase the scanning range of the RS system beyond that of ±12 deg. This paper will investigate such hybrid designs of the RS launcher, providing alternative configurations for optimizing the launching configuration, depending on the requirements of a given ECH and CD system. (38 refs.)



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