用InGrid探测器和CAST搜寻太阳变色龙
Using an InGrid Detector to Search for Solar Chameleons with CAST
摘要：
我们报告的建设，操作经验，和初步的背景测量的InGrid探测器，即一个MicroMegas探测器与CMOS像素读出。该探测器安装在欧洲核子研究中心CAST实验的Abrixas X射线望远镜的焦平面上。该探测器对宽能量范围（0.3- 10 keV）的软X射线敏感，因此能够搜索太阳变色龙。2014年秋季CAST数据采集期间探测器运行平稳。背景数据的初步分析表明$1-5\times 10^{-5}\,\mathrm{keV}^{-1}\mathrm{cm}^{-2}\mathrm{s}^{-1}$的背景速率高于2 keV，而$\sim 3\times 10^{-4}\,\mathrm{keV}^{-1}\mathrm{cm}^{-2}\mathrm{s}^{-1}$的背景速率约为1 keV。在太阳跟踪数据中没有过量的情况下，估计$β_γ\lesssim 5\times 10^{10}$对变色龙光子耦合的预期限制。我们还讨论了探测器的未来操作的前景。
英文摘要：
We report on the construction, operation experience, and preliminary background measurements of an InGrid detector, i.e. a MicroMegas detector with CMOS pixel readout. The detector was mounted in the focal plane of the Abrixas X-Ray telescope at the CAST experiment at CERN. The detector is sensitive to soft X-Rays in a broad energy range (0.3--10 keV) and thus enables the search for solar chameleons. Smooth detector operation during CAST data taking in autumn 2014 has been achieved. Preliminary analysis of background data indicates a background rate of $1-5\times 10^{-5}\,\mathrm{keV}^{-1}\mathrm{cm}^{-2}\mathrm{s}^{-1}$ above 2 keV and $\sim 3\times 10^{-4}\,\mathrm{keV}^{-1}\mathrm{cm}^{-2}\mathrm{s}^{-1}$ around 1 keV. An expected limit of $β_γ\lesssim 5\times 10^{10}$ on the chameleon photon coupling is estimated in case of absence of an excess in solar tracking data. We also discuss the prospects for future operation of the detector.
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