Contribution of x-ray incident position dependence to energy resolution of Ti/Au transition-edge sensors
Year: 2025
Type: article
Abstract: We present the contribution of x-ray incident-position dependence on the absorber to the energy resolution of Ti/Au transition-edge sensors (TESs). The pulse height varies with the position due to insufficient thermal conductivity and geometry of the absorber that degrades the measured energy resolution. We develop a three-dimensional (3D) electro-thermal simulation model and thoroughly study the position dependent contribution to energy resolution (Δ E p ) for two presentative absorber structures: an absorber directly deposited on the center of TES sensor (design A) and an absorber cantilevered on the TES sensor by several stems (design B). For design A with a 30 μm × 40 μm Au absorber Δ E p is found to be 9.4 eV, while it is reduced to 1.35 eV for design B with a 100 μm × 100 μm Au absorber. Although the contribution of position dependence is relatively small, this study facilitates further optimization of the absorber structure to achieve enhanced energy resolution.
Source: Chinese Physics B
Authors: Qing-Xiao 卿效 Ma 马, Wen 文 Zhang 张, Pei-Zhan 佩展 Li 李, Zhi-Fa 志发 Feng 冯, Xian-Feng 先锋 Zhou 周, Zheng 争 Wang 王, Jia-Qiang 家强 Zhong 钟, Wei 巍 Miao 缪, Yuan 远 Ren 任, Jing 婧 Li 李, Sheng-Cai 生才 Shi 史
Institution: Purple Mountain Observatory
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,500
OpenAlex ID: W4413381766