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Spectral Narrowing in Nonlinear Compton Scattering via Chirped Laser Pulses 认领 引用
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作者 Xiao-Hu Ji Aihua Liu Li-Guang Jiao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第4期62-73,共12页
Spectral broadening due to ponderomotive effects significantly limits the spectral brightness of light sources generated by nonlinear Compton scattering.In this study,within the strong-field quantum electrodynamics fr... Spectral broadening due to ponderomotive effects significantly limits the spectral brightness of light sources generated by nonlinear Compton scattering.In this study,within the strong-field quantum electrodynamics framework,we demonstrate that equal-power frequency-chirped laser pulses can significantly suppress spectral broadening by combining frequency modulation with temporal pulse extension. 展开更多
关键词 ponderomotive effects nonlinear compton scatteringin spectral narrowing spectral broadening nonlinear Compton scattering chirped laser pulses light sources combining frequency modulation temporal pulse extension
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An effective method toward large field-of-view gamma-ray computed tomography based on an inverse Compton scattering light source 认领 引用
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作者 Zhi-Jun Chi Hong-Ze Zhang +8 位作者 Jia-Yi Sun Hao Ding Jin Lin Xuan-Qi Zhang Qi-Li Tian Zhi Zhang Ying-Chao Du Wen-Hui Huang Chuan-Xiang Tang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第5期252-263,共12页
The quasi-monochromatic,continuously energy-tunable,and high-brightness gamma rays that are produced by an inverse Compton scattering(ICS)light source provide an ideal probe for gamma-ray imaging.However,owing to the ... The quasi-monochromatic,continuously energy-tunable,and high-brightness gamma rays that are produced by an inverse Compton scattering(ICS)light source provide an ideal probe for gamma-ray imaging.However,owing to the influence of the intrinsic energy-angle correlation spectrum of this type of light source,monochromatic computed tomography(CT),especially in the gamma-ray energy region,can only be realized in a low-efficiency manner,similar to first-generation CT.A dual-energy scan scheme with a large imaging field of view(FOV)was developed in this study to improve the imaging efficiency.The effectiveness of this scheme was demonstrated based on the beam parameters of a typical ICS light source using Monte Carlo simulations.By leveraging the principle of basis material decomposition,the influence of the energyangle correlation spectrum on CT reconstruction was corrected,and a monochromatic CT image of the imaging object was accurately reconstructed.Furthermore,the electron density and effective atomic number of the imaging object could be obtained simultaneously. 展开更多
关键词 Gamma-ray computed tomography Energy-angle correlation Basis material decomposition Inverse Compton scattering light source Monte Carlo simulation
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The study of polarization properties of laser Compton slant scattering gamma beam at SLEGS 认领 引用
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作者 Xiang-Fei Wang Kai-Jie Chen +13 位作者 Hang-Hua Xu Gong-Tao Fan Zi-Rui Hao Zhen-Wei Wang Long-Xiang Liu Yue Zhang Sheng Jin Qian-kun Sun Zhi-Cai Li Pu Jiao Meng-Die Zhou Yu-Long Shen Meng-Ke Xu Hong-Wei Wang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第6期1-14,共14页
Polarized high-energy photon gamma rays are excellent probes for nuclear and particle physics research.Recently,a unique method for generating MeV energy-tunable gamma rays,the Laser Compton Slant Scattering(LCSS)mode... Polarized high-energy photon gamma rays are excellent probes for nuclear and particle physics research.Recently,a unique method for generating MeV energy-tunable gamma rays,the Laser Compton Slant Scattering(LCSS)mode,was implemented at the Shanghai Laser Electron Gamma Source(SLEGS).A study of the polarization properties of the LCSS gamma beam at SLEGS combined theoretical simulations with experimental measurements.The intensity of spatial distributions and Stokes parameters were systematically simulated for LCSS of linearly/circularly polarized laser photons and unpolarized relativistic electrons.The measured scattered gamma spatial distributions at three typical slant incidence angles were in agreement with the simulation for the linearly polarized laser.The results imply that the polarization degree of the incident photon is almost completely transferred to the scattered gamma rays for any incident angle,while the direction of polarization of the scattered gamma ray changes with the incident and scattering angles. 展开更多
关键词 Laser Compton slant scattering SLEGS Polarized gamma beam Stokes parameter
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Feasibility study of a LYSO‑SiPM‑based prototype for hybrid Compton and PET imaging 认领 引用
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作者 Hai‑Hao Wang Yu‑Cun Hou +4 位作者 Jian‑Lang Hua Zi‑Quan Yuan Chen‑Xi Li Run‑Ze Liao Jian‑Yong Jiang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第1期80-93,共14页
We present a prototype for hybrid Compton and positron emission tomography(PET)imaging aimed at enhancing data utilization and enabling concurrent imaging of multiple radiopharmaceuticals.The prototype comprises two d... We present a prototype for hybrid Compton and positron emission tomography(PET)imaging aimed at enhancing data utilization and enabling concurrent imaging of multiple radiopharmaceuticals.The prototype comprises two detectors that utilize LYSO-SiPM and were available in our laboratory.One detector consists of a 50×50 array of LYSO crystals,each measuring 0.9mm×0.9mm×10mm with 1 mm pitches,whereas the other detector comprises a 25×25 array of LYSO crystals,each measuring 1.9mm×1.9mm×10mm with 2 mm pitches.These detectors are mounted on a rotational stage,which enables them to function as either a Compton camera or a PET detector pair.The 64-channel signals from the SiPMs of each detector are processed through a capacitive multiplexing circuit to yield four position-weighted outputs.Distinct energy windows were used to discriminate Compton events from PET events.Energy resolution and energy-channel relationships were calibrated via multiple sources.The measured average energy resolutions(full widths at half maximum,FWHMs)for the detectors at 511 keV were 17.5%and 15.2%,respectively.The initial experimental results indicate an angular resolution(FWHM)of 8.6◦for the system in Compton imaging mode.A V-shaped tube injected with 18 F solution was clearly reconstructed,which further verified the imaging capabilities of the system in Compton imaging mode.The results of simulation and experimental imaging studies show that the system can detect tumors as small as 1 mm in diameter when working in PET imaging mode.Mouse bone PET imaging was successfully conducted,with the results matching well with the corresponding CT images.This technology holds great potential for advancing the development of physiological function modalities. 展开更多
关键词 Positron emission tomography(PET) Compton camera Image reconstruction
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Coherent Compton scattering using a stretched off-axis paraboloid 认领 引用 被引量：1
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作者 Kai Zhao Chang-Bo Fu +1 位作者 Xiang-Jin Kong Yu-Gang Ma 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第8期270-277,共8页
Extreme ultraviolet(EUV)lithography is crucial for advancing semiconductor manufacturing;however,current EUV light sources,such as laser-produced plasma(LPP),have significant limitations,including low energy-conversio... Extreme ultraviolet(EUV)lithography is crucial for advancing semiconductor manufacturing;however,current EUV light sources,such as laser-produced plasma(LPP),have significant limitations,including low energy-conversion efficiency and debris contamination.Various schemes,including optical free-electron laser undulators,have been studied to generate coherent EUV light.However,optical undulators suffer from limited focal lengths,which pose a significant challenge to achieving a higher gain.In this study,a novel approach is proposed that employs a stretched off-axis paraboloid(sOAP)mirror,thus extending the focus distance to the centimeter range while achieving a well-controlled periodic light field.This enables high-intensity 92-eV EUV sources to exceed 1016/s,as demonstrated in the simulations.The proposed setup provides an efficient and powerful solution for advanced applications including semiconductor lithography. 展开更多
关键词 Laser Compton scattering(LCS) Coherent scattering Free-electron laser(FEL)
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《电化学(中英文)》顾问Richard Compton教授和编委任斌教授获国际电化学会(ISE)2025年度奖项 认领 引用
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《电化学（中英文）》 CAS 北大核心 2025年第8期I0003-I0004,共2页
近日,国际电化学会网站正式公布2025年度ISE奖项。《电化学(中英文)》期刊顾问、英国牛津大学Richard Compton教授荣获2025年度弗鲁姆金奖(Frumkin medal);《电化学(中英文)》期刊编委厦门大学任斌教授荣获2025年度ISE-Elsevier实验电... 近日,国际电化学会网站正式公布2025年度ISE奖项。《电化学(中英文)》期刊顾问、英国牛津大学Richard Compton教授荣获2025年度弗鲁姆金奖(Frumkin medal);《电化学(中英文)》期刊编委厦门大学任斌教授荣获2025年度ISE-Elsevier实验电化学奖(ISE-Elsevier Prize for Experimental Electrochemistry)。 展开更多
关键词 ISE-Elsevier实验电化学奖 弗鲁姆金奖 Richard Compton
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Compton散射下固体温度变化对光声信号强度的影响 认领 引用
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作者 皮小力 郝晓飞 郝东山 《核聚变与等离子体物理》 CAS 北大核心 2010年第4期323-326,共4页
应用多光子非线性Compton散射模型,研究了固体温度变化对光声信号强度的影响。结果表明,在Compton散射光和入射光形成的耦合光强度和频率不变时,随固体温度的升高,光声信号强度非线性迅速增强;固体温度不变时,随耦合激光强度和频率的增... 应用多光子非线性Compton散射模型,研究了固体温度变化对光声信号强度的影响。结果表明,在Compton散射光和入射光形成的耦合光强度和频率不变时,随固体温度的升高,光声信号强度非线性迅速增强;固体温度不变时,随耦合激光强度和频率的增大,光声信号强度几乎趋于0。 展开更多
关键词 Compton散射 固体温度 温度变化 光声信号强度 Compton scattering energy 多光子非线性 耦合光强度 频率 激光强度 不变 入射光 增强 升高 模型 结果
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Applications of Compton scattering 认领 引用
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作者 罗光 《Journal of Chongqing University》 2006年第4期193-199,共7页
Compton scattering is used very widely. In this article, we depict an overall picture for its applications which are based on two basic theories. The first is the electron densitometry theory related to electron densi... Compton scattering is used very widely. In this article, we depict an overall picture for its applications which are based on two basic theories. The first is the electron densitometry theory related to electron density. According to this theory its applications are in two fields: one is Compton scatter densitometry (CSD), the other is Compton scatter imaging (CSI). The second technique involves the electron momentum distribution and Compton profile. Applications of this technique are mainly the Compton profile analysis (CPA) and the Compton profile or the electron momentum distribution in physics and chemistry. Future research fields are suggested according to the current situation and limits of this technique and a promising prospect is unfolded. 展开更多
关键词 Compton scattering Compton profile electron dense electron momentum density
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多光子非线性Compton散射下的调制不稳定性对波分复用系统的影响 认领 引用 被引量：10
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作者 郝东山 陈向东 郝晓飞 《量子电子学报》 CAS 北大核心 2006年第2期235-239,257,共5页
运用小信号分析法,研究了多光子非线性Compton散射下的调制不稳定性(MI)对波分复用系统的影响,结果表明:计及散射光的调制不稳定性,不仅会使波分复用系统的信噪比(SNR)更快地下降,从而导致信号强度更快地减弱,而且还会对噪声有更大的放... 运用小信号分析法,研究了多光子非线性Compton散射下的调制不稳定性(MI)对波分复用系统的影响,结果表明:计及散射光的调制不稳定性,不仅会使波分复用系统的信噪比(SNR)更快地下降,从而导致信号强度更快地减弱,而且还会对噪声有更大的放大作用;这种调制不稳定性对波分复用系统中各信道的影响是不同的,它对短波段的作用强于长波段,也会使各信道的信噪比产生更大的偏差,将使长波段较短波段有更大的信噪比,信噪比的降低将随着长度的增加有较快的积累。 展开更多
关键词 光通信 非线性光学 调制不稳定性 波分复用 小信号分析 多光子非线性Compton散射
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High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source 认领 引用 被引量：4
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作者 Jian-Xin Wang Kui Zhou +7 位作者 Peng Li De-Xin Xiao Li-Jun Shan Xu-Ming Shen Yu Liu Zheng Zhou Han-Bin Wang Dai Wu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第4期51-61,共11页
We report our recent progress in the design and simulation of a high-brightness S-band photo-injector with a ballistic bunching scheme aimed at driving an inverse Compton scattering(ICS)X-ray source.By adding a short ... We report our recent progress in the design and simulation of a high-brightness S-band photo-injector with a ballistic bunching scheme aimed at driving an inverse Compton scattering(ICS)X-ray source.By adding a short standing-wave buncher between the RF gun and first booster in a conventional S-band photo-injector,electron bunches with a 500 pC charge can be compressed to the sub-picosecond level with very limited input RF power and an unchanged basic layout of the photo-injector.Beam dynamics analysis indicates that fine tuning of the focusing strength of the gun and linac solenoid can well balance additional focusing provided by the standing wave buncher and generate a well-compensated transverse emittance.Thorough bunching dynamics simulations with different operating conditions of the buncher show that a buncher with more cells and a moderate gradient is suitable for simultaneously obtaining a short bunch duration and low emittance.In a typical case of a 9-cell buncher with a 38 MV/m gradient,an ultrashort bunch duration of 0.5 ps(corresponding to a compression ratio of>5)and a low emittance of<1 mm mrad can be readily obtained for a 500 pC electron pulse.This feasible ballistic bunching scheme will facilitate the implementation of an ultrashort pulse mode inverse Compton scattering X-ray source on most existing S-band photo-injectors. 展开更多
关键词 Beam brightness Ballistic bunching Emittance compensation Compton scattering X-ray source
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GPU-accelerated three-dimensional reconstruction method of the Compton camera and its application in radionuclide imaging 认领 引用 被引量：4
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作者 Ren-Yao Wu Chang-Ran Geng +6 位作者 Feng Tian Zhi-Yang Yao Chun-Hui Gong Hao-Nan Han Jian-Feng Xu Yong-Shun Xiao Xiao-Bin Tang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第4期54-68,共15页
A novel and fast three-dimensional reconstruction method for a Compton camera and its performance in radionuclide imaging is proposed and analyzed in this study. The conical surface sampling back-projection method wit... A novel and fast three-dimensional reconstruction method for a Compton camera and its performance in radionuclide imaging is proposed and analyzed in this study. The conical surface sampling back-projection method with scattering angle correction(CSS-BP-SC) can quickly perform the back-projection process of the Compton cone and can be used to precompute the list-mode maximum likelihood expectation maximization(LM-MLEM). A dedicated parallel architecture was designed for the graphics processing unit acceleration of the back-projection and iteration stage of the CSS-BP-SC-based LM-MLEM. The imaging results of the two-point source Monte Carlo(MC) simulation demonstrate that by analyzing the full width at half maximum along the three coordinate axes, the CSS-BP-SC-based LM-MLEM can obtain imaging results comparable to those of the traditional reconstruction algorithm, that is, the simple back-projection-based LM-MLEM. The imaging results of the mouse phantom MC simulation and experiment demonstrate that the reconstruction results obtained by the proposed method sufficiently coincide with the set radioactivity distribution, and the speed increased by more than 664 times compared to the traditional reconstruction algorithm in the mouse phantom experiment. The proposed method will further advance the imaging applications of Compton cameras. 展开更多
关键词 Compton camera Three-dimensional reconstruction Radionuclide imaging GPU
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Compton散射下激光等离子体界面附近电子的运动 认领 引用 被引量：5
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作者 郝东山 郝晓飞 黄燕霞 《光子学报》 CAS 北大核心 2009年第1期16-21,共6页
研究了多光子非线性Compton散射下等离子体中两个不同密度区的界面附近耦合激光场中电子的运动,导出了电子的横向动量与纵向动量相互关系的一般方程.研究发现:介质的非均匀性导致电子运动特性的重要变化,在一定的条件下,这种非均匀性有... 研究了多光子非线性Compton散射下等离子体中两个不同密度区的界面附近耦合激光场中电子的运动,导出了电子的横向动量与纵向动量相互关系的一般方程.研究发现:介质的非均匀性导致电子运动特性的重要变化,在一定的条件下,这种非均匀性有利于注入电子获得加速;散射可有效地降低弹推阈值.当耦合脉冲强度低于弹推阈值时,电子最终被脉冲超过,但无论对初始时刻静止的电子还是运动的电子,能量增益均不为0,且随注入能量的提高而迅速地增加.当耦合脉冲强度高于弹推阈值时,电子最终超过脉冲而获得很高的能量增益,其值远远高于均匀等离子体的情况.在入射相同能量的情况下,耦合光会使电子获得更高的能量增益. 展开更多
关键词 等离子体 多光子非线性Compton散射 相对论因子 弹推阈值
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Compton散射下等离子体中的离子加速 认领 引用 被引量：5
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作者 郝晓飞 王其华 郝东山 《核聚变与等离子体物理》 CAS 北大核心 2010年第1期25-29,共5页
应用电子与多光子集团非线性Compton散射模型,将入射和散射光作为离子的传输机制,研究了Compton散射下多束相干强耦合激光等离子体中离子的运动,给出了相对论离子动力学方程,并进行了数值模拟。研究发现,散射使光的传播速度减小,系统的... 应用电子与多光子集团非线性Compton散射模型,将入射和散射光作为离子的传输机制,研究了Compton散射下多束相干强耦合激光等离子体中离子的运动,给出了相对论离子动力学方程,并进行了数值模拟。研究发现,散射使光的传播速度减小,系统的矢势和标势增大,由入射和散射光形成的多束相干强耦合激光能使质子加速到5.40GeV的能量,而耦合轴向电场在其中起着关键作用。 展开更多
关键词 离子加速 相干强耦合激光 激光等离子体 多光子非线性Compton散射
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Compton散射下强激光等离子体空气冲击波波前的传输特性 认领 引用 被引量：7
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作者 郝东山 谢红军 《强激光与粒子束》 EI CAS 北大核心 2006年第4期667-670,共4页
根据球对称激光等离子体空气冲击波在自由空间中传输的约束条件,对多光子非线性Compton散射的强激光等离子体空气冲击波波前的传输特性进行了研究,给出了散射下空气冲击波波前的运动方程,并进行了数值模拟。结果表明:该冲击波的衰减过... 根据球对称激光等离子体空气冲击波在自由空间中传输的约束条件,对多光子非线性Compton散射的强激光等离子体空气冲击波波前的传输特性进行了研究,给出了散射下空气冲击波波前的运动方程,并进行了数值模拟。结果表明:该冲击波的衰减过程不仅与爆炸源和爆炸过程的特性、释放总能量、空气的弹性有关,而且还与散射有关,散射效应使冲击波的初始半径增大,衰减过程加快,能量转移率提高;数值模拟与实验结果符合得很好。 展开更多
关键词 激光 爆炸 激光等离子体 多光子非线性Compton散射
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超强激光场中磁逆多光子非线性Compton散射的电子加速 认领 引用 被引量：3
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作者 郝晓飞 刘安辉 郝东山 《量子电子学报》 CAS 北大核心 2009年第6期664-667,共4页
应用电子与多光子集团非弹性Compton散射模型,分析、计算了磁逆多光子非线性Compton散射的电子加速,结果表明,散射前做Landau圆轨道运动的电子并非是热电子,而是处于激发态的电子。当耦合光的频率与处于激发态电子的频率相等时,能发生... 应用电子与多光子集团非弹性Compton散射模型,分析、计算了磁逆多光子非线性Compton散射的电子加速,结果表明,散射前做Landau圆轨道运动的电子并非是热电子,而是处于激发态的电子。当耦合光的频率与处于激发态电子的频率相等时,能发生磁逆多光子非线性Compton散射,放出高γ射线,但产生高γ射线的几率要比产生低γ射线的几率小。若电子被光场俘获,电子可从激光场中获得巨大的加速能量。 展开更多
关键词 激光物理 超强激光 磁逆Compton散射 Landau轨道 电子加速
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High energy and high brightness laser compton backscattering gamma-ray source at IHEP 认领 引用 被引量：3
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作者 Guang-Peng An Yun-Long Chi +23 位作者 Yong-Le Dang Guang-Yong Fu Bing Guo Yong-Sheng Huang Chuang-Ye He Xiang-Cheng Kong Xiao-Fei Lan Jia-Cai Li Fu-Long Liu Jin-Shui Shi Xian-Jing Sun Yi Wang Jian-Li Wang Lin Wang Yuan-Yuan Wei Gang Wu Guang-Lei Xu Xiao-Feng Xi Guo-Jun Yang Chun-Lei Zhang Zhuo Zhang Zhi-Peng Zheng Xiao-Ding Zhang Shao-Ping Zhang 《Matter and Radiation at Extremes》 SCIE EI 2018年第4期219-226,共8页
Based on the LINAC of BEPCII, a high-polarized, high bightness, energy-tunable, monoenergetic laser compton backscattering (LCS)gamma-ray source is under construction at IHEP. The gamma-ray energy range is from 1 MeV ... Based on the LINAC of BEPCII, a high-polarized, high bightness, energy-tunable, monoenergetic laser compton backscattering (LCS)gamma-ray source is under construction at IHEP. The gamma-ray energy range is from 1 MeV to 111 MeV. It is a powerful and hopeful researchplatform to reveal the underlying physics of the nuclear, the basic particles and the vacuum or to check the exist basic physical models, quantumelectrodynamic (QED) theories. In the platform, a 1.064 mm Nd:YAG laser system and a 10.6 mm CO2 laser system are employed. All the triggersignals to the laser system and the electron control system are from the only reference clock at the very beginning of the LINAC to make sure thetemporal synchronization. Two optical transition radiation (OTR) targets and two charged-couple devices (CCD) are used to monitor and to alignthe electron beam and the laser beam. With the LCS gamma-ray source, it is proposed to experimentally check the gamma-ray calibrations, thephoton-nuclear physics, nuclear astrophysics and some basic QED phenomena. 展开更多
关键词 laser compton scattering Calibration Photon-nuclear physics Gamma-gamma collider Nuclear astrophysics QED Gamma-gamma scattering Detection
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Compton散射下磁化等离子体光子晶体光子带隙特性 认领 引用 被引量：3
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作者 郝晓飞 李虎勇 郝东山 《激光技术》 CAS CSCD 北大核心 2012年第1期107-110,共4页
为了研究多光子非线性Compton散射对横向磁光效应磁化等离子体光子晶体光子带隙特性的影响,采用多光子非线性Compton散射模型和时域有限差分法进行了理论分析和实验验证,取得了关于晶体色散和调制不稳定性、光子带宽变化的重要数据,并... 为了研究多光子非线性Compton散射对横向磁光效应磁化等离子体光子晶体光子带隙特性的影响,采用多光子非线性Compton散射模型和时域有限差分法进行了理论分析和实验验证,取得了关于晶体色散和调制不稳定性、光子带宽变化的重要数据,并提出了将入射光和Compton散射光作为磁化等离子体光子晶体色散的新机制。结果表明,Compton散射使等离子体色散增强,耦合电磁波通带变窄、阻带变宽,有效地降低了电磁波传输中的交叉相位调制的不稳定性,频率低于等离子体频率的电磁波在等离子体中的传播几率减小。 展开更多
关键词 非线性光学 光子带隙 时域有限差分法 等离子体光子晶体 磁光效应 多光子非线性 Compton散射
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多光子非线性Compton散射的能量转换 认领 引用 被引量：28
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作者 郝东山 黄燕霞 《光子学报》 EI CAS 北大核心 2003年第4期441-443,共3页
研究了多光子非线性Compton散射中电子与光子的能量转换及其转换效率 结果表明 :散射光子频率随电子吸收光子数n的增大而增大 ,随碰撞非弹性成分 ξ的增大而迅速减小 在超强激光场中 ,当极端相对论性电子与光子发生多光子非线性Compton... 研究了多光子非线性Compton散射中电子与光子的能量转换及其转换效率 结果表明 :散射光子频率随电子吸收光子数n的增大而增大 ,随碰撞非弹性成分 ξ的增大而迅速减小 在超强激光场中 ,当极端相对论性电子与光子发生多光子非线性Compton散射且被光场俘获时 ,能量转换效率趋于无限大 ,即电子可以从超强激光场中获得巨大的加速能量 用高速电子束入射并与光子发生多光子非线性Compton散射 。 展开更多
关键词 多光子非线性Compton散射 康普顿散射 能量转换效率 超强激光场 电子加速器 散射光子
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Compton散射对斜入射激光脉冲在等离子体中传输的影响 认领 引用 被引量：7
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作者 刘安辉 郝晓飞 郝东山 《原子与分子物理学报》 CAS CSCD 北大核心 2011年第6期1075-1081,共7页
应用多光子非线性Compton散射模型和等效折射指数模型,研究了Compton散射对斜入射激光脉冲在等离子体中传输特性的影响,提出了将入射光和Compton散射光形成的耦合光脉冲作为在等离子体中传输的新机制,用等效耦合折射指数和折射定律分别... 应用多光子非线性Compton散射模型和等效折射指数模型,研究了Compton散射对斜入射激光脉冲在等离子体中传输特性的影响,提出了将入射光和Compton散射光形成的耦合光脉冲作为在等离子体中传输的新机制,用等效耦合折射指数和折射定律分别计算和数值模拟了等离子体中耦合光的反射和折射,结果表明,散射使等离子体中法拉第效应增强,产生了一个与折射界面平行的、较小等幅度附加折射波平面;使等效耦合折射指数的实部和虚部的实参数、折射角和等效折射指数之间的差异明显减小;使用等效耦合折射指数和折射定所得到的反射系数几乎均表现出相同的先增大后迅速减小的规律;使等离子体的反射系数随碰撞频率的增大而迅速减小,透射增强,透射增强的频率位置向高频明显移动. 展开更多
关键词 等离子体 等效折射指数 斜入射 耦合 多光子非线性Compton散射
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Dose reconstruction with Compton camera during proton therapy via subset-driven origin ensemble and double evolutionary algorithm 认领 引用 被引量：4
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作者 Zhi-Yang Yao Yong-Shun Xiao Ji-Zhong Zhao 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2023年第4期135-148,共14页
Compton camera-based prompt gamma(PG) imaging has been proposed for range verification during proton therapy. However, a deviation between the PG and dose distributions, as well as the difference between the reconstru... Compton camera-based prompt gamma(PG) imaging has been proposed for range verification during proton therapy. However, a deviation between the PG and dose distributions, as well as the difference between the reconstructed PG and exact values, limit the effectiveness of the approach in accurate range monitoring during clinical applications. The aim of the study was to realize a PG-based dose reconstruction with a Compton camera, thereby further improving the prediction accuracy of in vivo range verification and providing a novel method for beam monitoring during proton therapy. In this paper, we present an approach based on a subset-driven origin ensemble with resolution recovery and a double evolutionary algorithm to reconstruct the dose depth profile(DDP) from the gamma events obtained by a cadmium-zinc-telluride Compton camera with limited position and energy resolution. Simulations of proton pencil beams with clinical particle rate irradiating phantoms made of different materials and the CT-based thoracic phantom were used to evaluate the feasibility of the proposed method. The results show that for the monoenergetic proton pencil beam irradiating homogeneous-material box phantom,the accuracy of the reconstructed DDP was within 0.3 mm for range prediction and within 5.2% for dose prediction. In particular, for 1.6-Gy irradiation in the therapy simulation of thoracic tumors, the range deviation of the reconstructed spreadout Bragg peak was within 0.8 mm, and the relative dose deviation in the peak area was less than 7% compared to the exact values. The results demonstrate the potential and feasibility of the proposed method in future Compton-based accurate dose reconstruction and range verification during proton therapy. 展开更多
关键词 Prompt gamma imaging Dose reconstruction Range verification Origin ensemble Compton camera Evolutionary algorithm
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