This study focuses on the calibration issues of the position-sensitive 3He tube neutron detector,which is a core component of the high-pressure neutron diffractometer under the Chinese Spallation Neutron Source.Through experimental validation and theoretical analysis,it reveals the influence of neutron signal amplitude,which has been overlooked in traditional calibration methods,on calibration parameters,leading to distortions in position distribution and reduced spatial resolution.To address these issues,an improved calibration algorithm is proposed in this study,which effectively considers the variations in neutron signal amplitude,thereby significantly improving the spatial resolution capability of the detector system.Experimental results analysis demonstrates that the new calibration algorithm not only eliminates the tailing effect in the position distribution but also enhances the spatial resolution at different positions,consistent with theoretical expectations.The findings of this study provide important technical support for the application of high-pressure neutron diffractometers under extreme conditions,and lay the foundation for further optimization of neutron detector calibration methods and improvement of the application accuracy of neutron diffraction techniques.
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