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9月25日学术报告

来源： 发布时间：2014-09-17【字体：大 中 小】

　　题目：Search for Dark Matter with the CERN Axion Solar Telescope (CAST) 

　　报 告 人：Dieter H. H. Hoffmann教授 

　　单位：Technische Universität Darmstadt; Chief Editor of Laser and Particle Beams 

　　报告题目： Search for Dark Matter with the Cern Axion Solar Telescope (CAST) 

　　报告时间：2014年9月25日（周四）9：30 

　　报告地点：西区·溢智厅 

　　  

　　报告简介： 

　　The CAST experiment is designed to search for solar axions which are produced in the interior of the sun via the Primakoff effect. The central part of the experiment, the helioscope is an LHC prototype magnet that has attached different types of sensitive detectors for x-rays in the regime of 1-10 keV. The experiment has been taking data since 2003 and provided the most restrictive limits on the axion-photon coupling in a broad mass range. Beyond 0.02eV/c^2 the mass the sensitivity is degraded due to coherence loss. In order to restore coherence, the magnet can be filled with a buffer gas providing an effective mass to the photon. By changing the pressure of the buffer gas in steps, one can scan an entire range of axion mass values.  The CAST experiment completed this gas program with 4He gas extending the sensitivity to masses up to 0.4 eV, and from March 2008 onwards the magnet bore has been filled with 3He. With the end of the data taking this year, the CAST experiment has covered the axion mass range to 1.18 eV surpassing the initial goal. However, Dark Matter may not be as dark as anticipated and unstable dark matter can reconcile observations from the Coma cluster, with its lifetime reflecting that of the Universe. An overview on the current status of CAST and the future perspectives will be given. 

　　补充材料： 

　　CERN on Wikipedia, click here  

　　CAST on Wikipedia, click here 

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