在CAST实验中用Micromegas探测器探测eV-mass标度轴子
Probing eV-mass scale axions with a Micromegas detector in the CAST experiment
摘要：
CAST（欧洲核子研究中心轴子太阳望远镜）实验正在寻找轴子，这是一种假设的粒子，它可能成为强相互作用中众所周知的CP破坏问题的解决方案。CAST正在使用一个退役的LHC偶极磁铁，能够跟踪太阳作为太阳轴子的可能来源，并将它们转换为X射线光子，可以用低背景X射线探测器探测。CAST继续其数据采集周期扫描质量高达1 eV。本论文介绍了用Micromegas探测器获得的扫描轴子质量范围为0.64eV的数据。详细介绍了在CAST中运行的Micromegas探测器的工作原理、特性和分析。此外，最后的探测器数据对应于新的数据采集周期，与3 He气体内的孔，被用来获得一个新的轴子质量范围内探索，g_{aγ} < 2.44 10^{-10} GeV^{-1}的轴子-光子耦合的保守的上限。
英文摘要：
The CAST (CERN Axion Solar Telescope) experiment is searching for axions, an hypothetical particle that emerges as a possible solution to the well known CP violation problem in strong interactions. CAST is using a decommissioned LHC dipole magnet able to track the Sun as a possible source of solar axions, and to convert them to X-rays photons detectable with low background X-ray detectors. CAST continues its data taking period scanning masses up to 1eV. This thesis presents the data obtained with a Micromegas detector for the scanned axion mass range up to 0.64eV. The working principle, characterization and analysis of the Micromegas detectors operating in CAST are detailed in this work. Moreover, the last detector data corresponding to the new data taking period, with 3He gas inside the bores, was used to obtain a preliminar and conservative upper limit on the axion-photon coupling for the new axion mass range explored, g_{aγ} < 2.44 10^{-10} GeV^{-1}.
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