论文标题
XL-Calibur抗收益盾牌的设计和性能
The design and performance of the XL-Calibur anticoincidence shield
论文作者
论文摘要
XL-Calibur气球播放的硬X射线极化任务包括位于X射线镜的焦点的compton散落的极性计。偏振仪位于BGO抗收益屏蔽层中，这是减轻约40 km的观测高度处存在的可观背景辐射所需的。本文详细介绍了2022年7月从埃斯兰奇航天中心到加拿大西北领土的为期一周的处女航班上测量的抗收益盾牌的设计，结构和测试。盾牌在设计期望下，盾牌的机上表现，遵循的预期，具有兽医阈值<100 kev <100 kev和衡量的背景速率，均为约0.5 hz（20-0-40 kev）（20-0-40 kev）。这与该任务的科学目标兼容，其中寻求百分比最小可检测到的极化以达到HZ级源率。
The XL-Calibur balloon-borne hard X-ray polarimetry mission comprises a Compton-scattering polarimeter placed at the focal point of an X-ray mirror. The polarimeter is housed within a BGO anticoincidence shield, which is needed to mitigate the considerable background radiation present at the observation altitude of ~40 km. This paper details the design, construction and testing of the anticoincidence shield, as well as the performance measured during the week-long maiden flight from Esrange Space Centre to the Canadian Northwest Territories in July 2022. The in-flight performance of the shield followed design expectations, with a veto threshold <100 keV and a measured background rate of ~0.5 Hz (20-40 keV). This is compatible with the scientific goals of the mission, where %-level minimum detectable polarisation is sought for a Hz-level source rate.
