波恩等时回旋加速器对GridPix探测器的离子辐照
Ion Irradiation of GridPix Detector at Bonn Isochronous Cyclotron
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中文总结 AI 辅助
该研究在波恩等时回旋加速器对GridPix探测器开展离子辐照测试，采用两种束流模式，发现累积离子速率超预期限值但芯片性能未显著恶化，为EXPO探测器的可靠性提供了支撑。
中文摘要 AI 辅助
IXPE的潜在后继者——EXPO（即增强型X射线偏振观测台）将搭载基于GridPix技术的新型X射线偏振仪。为验证该探测器在预期辐射环境条件下的运行可靠性，研究人员在波恩大学HISKPabbreviation（即Helmholtz-Institut für Strahlen- und Kernphysik，亥姆霍兹辐射与核物理研究所）的波恩等时回旋加速器开展辐照测试，采用两种束流模式：14 MeV质子束与100 MeV的¹⁴N⁵⁺离子束。上述GridPix探测器包含读出ASIC Timepix，其具有256×256像素网格，像素间距为55 μm，且覆盖有保护层；铝制网格位于SU8支柱上、像素上方，构成放大级，网格孔与硅像素的对准可实现初级电子探测。本文重点描述这些测试束流的情况及结果：累积离子速率远超预期限值，但芯片性能未出现显著恶化。
英文摘要
The potential successor of the IXPE --- the EXPO or Enhanced X-ray Polarimetry Observatory will have a new X-ray polarimeter based on GridPix technology. To certify this detector for operation within the expected radiation environment conditions, the irradiation tests were performed at the Bonn Isochronous Cyclotron at HISKPabbreviation\footnote{ stands for Helmholtz-Institut für Strahlen- und Kernphysik or Helmholz Institute for Radiation and Nuclear Physics}, University of Bonn. Two beam modes were used --- proton beam at 14\,MeV and 100\,MeV $^{14}\mathrm{N}^{5+}$ ions. The aforementioned GridPix detector contains the readout ASIC, Timepix, with $256\times256$ pixel grid with a pitch of \SI{55}{\micro\meter} and covered with a protection layer. The Al grid stands on the SU8 pillars above pixels forming the amplification stage. The alignment of grid holes and silicon pixels enable primary electron detection. This paper focuses on the description and results of these testbeams. The accumulated ion rates exceed by far the expected limits without a significant deterioration in chip performance.
