Subsub-arcseconds x-ray imaging with multi-image x-ray interferometer module (MIXIM): experimental results
Subsub-arcseconds x-ray imaging with multi-image x-ray interferometer module (MIXIM): experimental results
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DOI：
10.1117/12.2560772
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发表时间：
2020-12
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通讯作者：
K. Asakura;K. Hayashida;T. Hanasaka;T. Kawabata;T. Yoneyama;H. Noda;S. Sakuma;K. Okazaki;A. Ishikura;M. Hanaoka;S. Ide;K. Hattori;H. Matsumoto;H. Tsunemi;H. Awaki;H. Nakajima;J. Hiraga
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作者：
K. Asakura;K. Hayashida;T. Hanasaka;T. Kawabata;T. Yoneyama;H. Noda;S. Sakuma;K. Okazaki;A. Ishikura;M. Hanaoka;S. Ide;K. Hattori;H. Matsumoto;H. Tsunemi;H. Awaki;H. Nakajima;J. Hiraga
为了实现高角度分辨率，我们提出了一种新型的X射线干涉仪--多像X射线干涉仪模块(MIXIM)。MIXIM由一个光栅和一个X射线探测器组成，其角分辨率与两个组件之间的距离成反比。虽然我们在过去的实验中已经探测到了对应于约1“角分辨率的一维干涉条纹，但它的幅度不是很高，部分原因是缺乏X射线探测器的空间分辨率。然后，我们采用了一种同时具有高空间分辨率(<；2.5μm)和高光谱能力(半高宽∼170 eV@5.9keV)的CMOS探测器，并在日本同步辐射装置BL20B2上对MIXIM的性能进行了评估。实验中的一维干涉条纹的幅度比过去的实验中的要大得多，这表明由于新的CMOS探测器的性能得到了改善。我们还首次引入了一种二维光栅，并尝试获得了尺寸为0.28“(H)和0.06”(V)的X射线束的二维轮廓。将两个组件之间的距离扩展到866.5厘米，MIXIM的2D成像成功地捕捉到了水平拉长的束流结构。在此构型下的角分辨率计算为0.076“，这是天文X射线成像仪有史以来实现的最高分辨率。
We have proposed a new style X-ray interferometer, Multi-Image X-ray Interferometer Module (MIXIM), to achieve high angular resolution. MIXIM is comprised of a grating and an X-ray detector, and its angular resolution is in inverse proportion to the distance between two components. Although we have already detected a 1D interference fringe which corresponds an angular resolution of about 1” in our past experiment, its amplitude is not so high partly because of the lack of the spatial resolution of the X-ray detector. Then we newly adopt a CMOS detector which has both high spatial resolution (< 2.5 μm) and high spectroscopic capability (FWHM∼ 170 eV @5.9 keV) and evaluate the performance of MIXIM at BL20B2 in SPring-8, the synchrotron radiation facility in Japan. 1D interference fringes in this experiment have much higher amplitudes than those in the past experiment, which demonstrates the improvement of the performance due to the new CMOS detector. We also introduce a 2D grating for the first time, and try to obtain the 2D profile of the X-ray beam of which the size is 0.28” (H) and 0.06” (V). Extending the distance between two components to 866.5 cm, 2D imaging by MIXIM succeeds in capturing the horizontally elongated beam structure. The angular resolution at this configuration is calculated to be 0.076”, which is the highest ever achieved for astronomical X-ray imagers.