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	2 K cryogenic system development for superconducting cavity testing of CiADS 期刊论文 OAI收割 CRYOGENICS, 2021, 卷号: 115, 页码: 13 作者: Xiao-fei, Niu; Feng, Bai; Xian-jin, Wang; Peng, Zhang; Yong-hui, Yang \| 收藏 \| 浏览/下载：37/0 \| 提交时间：2021/12/10 CiADS Superconducting Cryogenic system Liquid helium 2 K Cavity testing
	Temperature gradients effect on surface test with high precise interferometer (EI CONFERENCE) 会议论文 OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China 作者: Gu Y.-Q.; Yang H.-J.; Sui Y.-X.; Zhang J.; Zhang J. 收藏 \| 浏览/下载：29/0 \| 提交时间：2013/03/25 In high precise surface testing temperature stability and uniformity are of paramount importance to the high accuracy of test results. Micro-temperature variation and temperature gradients not only cause the change of the air refractive index and lead to the optical path variation in interferometer cavity but also result in deformation of the tested surface itself which always brings about errors to the test results. Temperature effects on the interferometer cavity and the tested surface are analyzed from the axial and radial directions in this letter. Temperature model of the interferometer cavity and the tested lens are established and quantitative calculations and diagram of test results versus temperature and lens dimension are provided. It shows that temperature gradients effect increase with the length of the interferometer and the dimension of the tested lens. The interferometer cavity is mainly affected by radial temperature gradients while the tested lens is mainly affected by the axial temperature gradients. 2010 Copyright SPIE - The International Society for Optical Engineering.
	Influence of spatial temperature distribution on high accuracy interferometric metrology (EI CONFERENCE) 会议论文 OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China 作者: Yang H.; Zhang J.; Zhang J.; Zhang J.; Yan F. 收藏 \| 浏览/下载：26/0 \| 提交时间：2013/03/25 We calculate the influence of temperature change on the refractive index of air establish a model of air temperature distribution and analyze the effect of different temperature distribution on the high accuracy interferometric metrology. First a revised Edlen formula is employed to acquire the relation between temperature and refractive index of air followed by introducing the fixed temperature gradient distribution among the spatial grid within the optical cavity between the reference flat and the test flat of the Fizeau interferometer accompanied by a temperature change random function within each grid. Finally all the rays through the air layer with different incident angles are traced by Matlab program in order to obtain the final output position angle and OPD for each ray. The influence of different temperature distribution and the length of the optical cavity in on the testing accuracy can be analyzed through the RMS value that results from repeatable rays tracing. As a result the horizontal distribution (vertical to optical axis) has a large effect on the testing accuracy. Thus to realize the high accuracy figure metrology the horizontal distribution of temperature must be rigorously controlled as well as to shorten the length of the optical cavity to a large extent. The results from our simulation are of great significant for the accuracy analysis of interferometric testing and the research of manufacturing a interferometer. 2010 Copyright SPIE - The International Society for Optical Engineering.
	Evaluation of external quality factor of the superconducting cavity using extrapolation method 期刊论文 OAI收割 NUCLEAR SCIENCE AND TECHNIQUES, 2009, 卷号: 20, 期号: 2, 页码: 6 Ma, ZY（马震宇）; Ma, GM; Hou, HT（侯洪涛）; Yu, HB; Zhang, R; Liu, JF(刘剑飞）收藏 \| 浏览/下载：20/0 \| 提交时间：2012/04/11 External quality factor Vertical testing Superconducting cavity Coaxial input coupler