Abstract

The GAMMA-400 gamma-ray telescope is planned for the launch at the end of 2026 on the Navigator service platform designed by Lavochkin Association on an elliptical orbit with following initial parameters: an apogee \({\sim}\)300 000, a perigee \({\sim}\)500 km, a rotation period \({\sim}\)7 days and inclination of 51.4\({}^{\circ}\). The apparatus is expected to operate for more than 5 years, reaching an unprecedented sensitivity for the search of dark matter signatures and the study of the unresolved and so far unidentified gamma-ray sources. The segmented anticoincidence counters surround the converter-tracker and calorimeter of the telescope with the purpose of vetoing to assure a clean track reconstruction and charged particle background suppression. The anticoincidence detector prototype based on long BC-408 scintillator with silicon photomultipliers readout was tested using 300-MeV positron beam of synchrotron C-25P ‘‘PAKHRA’’ of Lebedev Physical Institute. The measurement setup, design concepts for the prototype detector together with test results are discussed.

中文翻译：

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天基伽玛射线望远镜GAMMA-400的反符合系统，具有SiPM读数的反符合探测器原型的测试光束研究

摘要

GAMMA-400伽马射线望远镜计划于2026年底在Lavochkin协会设计的具有以下初始参数的椭圆轨道上的Navigator服务平台上发射：远地点\（{{sim} \） 30万，近地点\（{\ sim} \） 500公里，旋转周期\（{\ sim} \） 7天，倾斜度为51.4 \（{} ^ {\ circ} \）。预计该装置将运行5年以上，以达到前所未有的灵敏度，可用于暗物质特征的搜索以及尚未解决的和迄今尚未识别的伽马射线源的研究。分段的反符合计数器围绕着望远镜的转换器跟踪器和量热仪，以否决权为目的，以确保干净的轨道重构和带电粒子背景抑制。使用Lebedev物理研究所的同步加速器C-25P“ PAKHRA”的300MeV正电子束测试了基于长BC-408闪烁体并带有硅光电倍增管读数的反符合检测器原型。讨论了测量设置，原型检测器的设计概念以及测试结果。