Ground Calibration Result of the Wide-field X-ray Telescope (WXT) onboard the Einstein Probe
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916757053112320 |
|---|---|
| author | Cheng, Huaqing Zhang, Chen Ling, Zhixing Sun, Xiaojin Sun, Shengli Liu, Yuan Dai, Yanfeng Jia, Zhenqing Pan, Haiwu Wang, Wenxin Zhao, Donghua Chen, Yifan Cheng, Zhiwei Fu, Wei Han, Yixiao Li, Junfei Li, Zhengda Ma, Xiaohao Xue, Yulong Yan, Ailiang Zhang, Qiang Wang, Yusa Yang, Xiongtao Zhao, Zijian Li, Longhui Jin, Ge Yuan, Weimin |
| author_facet | Cheng, Huaqing Zhang, Chen Ling, Zhixing Sun, Xiaojin Sun, Shengli Liu, Yuan Dai, Yanfeng Jia, Zhenqing Pan, Haiwu Wang, Wenxin Zhao, Donghua Chen, Yifan Cheng, Zhiwei Fu, Wei Han, Yixiao Li, Junfei Li, Zhengda Ma, Xiaohao Xue, Yulong Yan, Ailiang Zhang, Qiang Wang, Yusa Yang, Xiongtao Zhao, Zijian Li, Longhui Jin, Ge Yuan, Weimin |
| contents | We report on results of the on-ground X-ray calibration of the Wide-field X-ray Telescope (WXT) built from novel lobster-eye micro-pore optics, onboard the Einstein Probe (EP) satellite. To fully characterize the instrumental performance and properties, a series of tests and calibrations have been carried out at different levels of devices, assemblies and the complete module before the launch of EP. In this paper, we present the calibration results of three flight model modules (FM1, FM5 and FM11) obtained during their end-to-end module calibration experiments carried out at the 100-m X-ray Test Facility (100XF) of IHEP, CAS. Measurements of the Point Spread Function (PSF), effective area, and energy response were performed for multiple incident directions and several characteristic X-ray emission line energies. Specifically, the distributions of the PSF and effective areas are found to be roughly uniform across the FoV, in large agreement with the prediction of lobster-eye optics. Their energy dependence behavior aligns well with theoretical predictions and Monte Carlo simulations. At 1.25 keV, the full width at half maximum (FWHM) of the focal spot is in range of 3-7 arcmin (a median of 4.2) and the effective area in range of 2-3 $cm^2$. Noticeably, the flight model instruments demonstrate a $\sim1.5$ arcmin spatial resolution improvement over the previously launched Lobster Eye Imager for Astronomy. The properties of the complementary metal-oxide semiconductor (CMOS) sensors were also calibrated. The gain coefficients are in range of 6.4-6.9 eV/DN. The energy resolutions are in range of 120-140 eV at 1.25 keV, meeting design requirements. These calibration results have been ingested into the first version of calibration database (CALDB) and applied to the analysis of the scientific data acquired by WXT after the launch of EP. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_18939 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ground Calibration Result of the Wide-field X-ray Telescope (WXT) onboard the Einstein Probe Cheng, Huaqing Zhang, Chen Ling, Zhixing Sun, Xiaojin Sun, Shengli Liu, Yuan Dai, Yanfeng Jia, Zhenqing Pan, Haiwu Wang, Wenxin Zhao, Donghua Chen, Yifan Cheng, Zhiwei Fu, Wei Han, Yixiao Li, Junfei Li, Zhengda Ma, Xiaohao Xue, Yulong Yan, Ailiang Zhang, Qiang Wang, Yusa Yang, Xiongtao Zhao, Zijian Li, Longhui Jin, Ge Yuan, Weimin Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena High Energy Physics - Experiment Instrumentation and Detectors We report on results of the on-ground X-ray calibration of the Wide-field X-ray Telescope (WXT) built from novel lobster-eye micro-pore optics, onboard the Einstein Probe (EP) satellite. To fully characterize the instrumental performance and properties, a series of tests and calibrations have been carried out at different levels of devices, assemblies and the complete module before the launch of EP. In this paper, we present the calibration results of three flight model modules (FM1, FM5 and FM11) obtained during their end-to-end module calibration experiments carried out at the 100-m X-ray Test Facility (100XF) of IHEP, CAS. Measurements of the Point Spread Function (PSF), effective area, and energy response were performed for multiple incident directions and several characteristic X-ray emission line energies. Specifically, the distributions of the PSF and effective areas are found to be roughly uniform across the FoV, in large agreement with the prediction of lobster-eye optics. Their energy dependence behavior aligns well with theoretical predictions and Monte Carlo simulations. At 1.25 keV, the full width at half maximum (FWHM) of the focal spot is in range of 3-7 arcmin (a median of 4.2) and the effective area in range of 2-3 $cm^2$. Noticeably, the flight model instruments demonstrate a $\sim1.5$ arcmin spatial resolution improvement over the previously launched Lobster Eye Imager for Astronomy. The properties of the complementary metal-oxide semiconductor (CMOS) sensors were also calibrated. The gain coefficients are in range of 6.4-6.9 eV/DN. The energy resolutions are in range of 120-140 eV at 1.25 keV, meeting design requirements. These calibration results have been ingested into the first version of calibration database (CALDB) and applied to the analysis of the scientific data acquired by WXT after the launch of EP. |
| title | Ground Calibration Result of the Wide-field X-ray Telescope (WXT) onboard the Einstein Probe |
| topic | Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena High Energy Physics - Experiment Instrumentation and Detectors |
| url | https://arxiv.org/abs/2505.18939 |