The design and performance of the XL-Calibur anticoincidence shield
arXiv:2212.04139 · doi:10.1016/j.nima.2022.167975
Abstract
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.
arXiv commentSubmitted to Nuclear Instruments and Methods A
References in corpus (10)
- Cosmic X-ray background and Earth albedo Spectra with Swift/BAT
- On understanding the figures of merit for detection and measurement of x-ray polarization
- Scientific Prospects for Hard X-ray Polarimetry
- XL-Calibur -- a second-generation balloon-borne hard X-ray polarimetry mission
- The design and performance of GRD onboard the GECAM satellite
- Observations of a GX 301-2 Apastron Flare with the X-Calibur Hard X-Ray Polarimeter Supported by NICER, the Swift XRT and BAT, and Fermi GBM
- The design and flight performance of the PoGOLite Pathfinder balloon-borne hard X-ray polarimeter
- Study on the temperature dependence of BGO light yield
- The design and performance of CUBES -- a CubeSat X-ray detector
- A Study of Active Shielding Optimized for 1-80 keV Wide-Band X-ray Detector in Space