کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1770968 | 1523384 | 2012 | 7 صفحه PDF | دانلود رایگان |
Reflective light collectors with hexagonal entrance and exit apertures are frequently used in front of the focal-plane camera of a very-high-energy gamma-ray telescope to increase the collection efficiency of atmospheric Cherenkov photons and reduce the night-sky background entering at large incident angles. The shape of a hexagonal light collector is usually based on Winston’s design, which is optimized for only two-dimensional optical systems. However, it is not known whether a hexagonal Winston cone is optimal for the real three-dimensional optical systems of gamma-ray telescopes. For the first time we optimize the shape of a hexagonal light collector using quadratic and cubic Bézier curves. We demonstrate that our optimized designs simultaneously achieve a higher collection efficiency and background reduction rate than traditional designs.
► We optimize the collection efficiency of a hexagonal light collector to be used for very-high-energy gamma-ray telescopes.
► Quadratic and cubic Bézier curves are used for the inner shape of a light collector instead of a Winston cone.
► The efficiency of the optimized design is higher for signal photons and lower for stray light compared to a Winston cone.
Journal: Astroparticle Physics - Volume 38, October 2012, Pages 18–24