Calibrating the HXMT collimators using diffuse illumination |
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Authors: | Han Dong Jin YongJie Wu Mei Zhang Zhi |
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Institution: | 1.Department of Engineering Physics & Center for Astrophysics,Tsinghua University,Beijing,China;2.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,China |
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Abstract: | We propose a new method to calibrate the HXMT collimators by measuring the optical point spread function (PSF) of the hard X-ray modulation telescope (HXMT). The light transmission of the collimator at different viewing angles with a camera and a diffuse backlight placed behind the collimator is measured. This method is much easier to accomplish than measuring the PSF with a parallel optical beam. The experimental results are very consistent with the simulations. The PSF of the collimator of the high energy X-ray telescope on HXMT is found to be in good agreement with the design, with accuracy better than 1 arcmin. |
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