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Effect of multiple coulomb scattering on the beam tests of silicon pixel detectors

Nuclear Science and Techniques 2024年第4期35卷 200-207页

作者： Lan-Kun Li Ming-Yi Dong Ze Gao Liang-Cheng-Long Jin Shu-Jun Zhao School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Particle Detection and Electronics(Institute of High Energy Physics CAS)Beijing 100049China University of Chinese Academy of Science Beijing 100049China University of South China Hengyang 421001China

In the research and development of new silicon pixel detectors,a collimated monoenergetic charged-particle test beam equipped with a high-resolution pixel-beam telescope is crucial for prototype verification and performance *** the beam energy is low,the effect of multiple Coulomb scattering on the measured resolution of the Device Under Test(DUT)must be considered to accurately evaluate the performance of the pixel chips and *** study aimed to investigate the effect of multiple Coulomb scattering on the measured resolution,particularly at low beam *** were conducted using Allpix^(2) to study the effects of multiple Coulomb scattering under different beam energies,material budgets,and telescope *** simulations also provided the minimum energy at which the effect of multiple Coulomb scattering could be *** with the results of a five-layer detector system tested with an electron beam at DESY,the simulation results were consistent with the beam test results,confirming the reliability of the simulations.

关键词： silicon pixel detectors Beam Telescope Multiple Coulomb Scattering Spatial Resolution

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Hi'CT:a pixel sensor-based device for ion tomography

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Nuclear Science and Techniques 2023年第7期34卷 231-241页

作者： Yi-Lun Chen Hong-Kai Wang Shi-Yu Zhang Hai-Bo Yang Cheng-Xin Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516003China

Carbon ions,commonly referred to as particle therapy,have become increasingly popular in the last *** predicting the range of ions in tissues is important for the precise delivery of doses in heavy-ion *** uncertainty is currently the largest contributor to dose uncertainty in normal tissues,leading to the use of safety margins in treatment *** potential method is the direct relative stopping measurement(RSP)with ***-ion CT(Hi′CT),a compact segmented full digital tomography detector using monolithic active pixel sensors,was designed and evaluated using a 430 MeV/u high-energy carbon ion pencil beam in *** precise position of the individual carbon ion track can be recorded and reconstructed using a 30μm×30μm small pixel pitch *** types of customized image reconstruction algorithms were developed,and their performances were evaluated using three different modules of CAT-PHAN 600-series *** RSP measurement accuracy of the tracking algorithm for different types of materials in the CTP404 module was less than 1%.In terms of spatial resolution,the tracking algorithm could achieve a 20%modulation transfer function normalization value of CTP528 imaging results at 5 lp/cm,which is significantly better than that of the fast imaging algorithm(3 lp/cm).The density resolution obtained using the tracking algorithm of the customized CTP515 was approximately 10.5%.In conclusion,a compact digital Hi'CT system was designed,and its nominal performance was evaluated in a *** RSP resolution and image quality provide potential feasibility for scanning most parts of an adult body or pediatric patient,particularly for head and neck tumor treatment.

关键词： Heavy-ion imaging Computed tomography silicon pixel detectors Monte Carlo Phantoms Radiotherapy Image-guided Tracking

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