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1. chinaXiv:202206.00139 [pdf]

Commissioning of Laser Electron Gamma Beamline SLEGS at SSRF

王宏伟; 范功涛; 刘龙祥; 许杭华; 沈文庆; 马余刚; Hiroaki Utsunomiya; 宋龙龙; 曹喜光; 郝子锐; 陈开杰; 金晟; 杨宇萱; 胡新荣; 李鑫祥; 匡攀
Subjects: Physics >> Nuclear Physics

Shanghai Laser Electron Gamma Source (SLEGS) is a powerful gamma source to provide MeV gamma-ray beams for nuclear science and technology. It is developed as one of the sixteen beamline stations in Phase II Project of the Shanghai Synchrotron Radiation Facility (SSRF). The slant-scattering mode is for the first time systematically employed in the laser Compton scattering (LCS) at SLEGS to produce energy-tunable quasi-monoenergetic gamma-ray beams.  SLEGS officially completed its commissioning from July to December 2021. Gamma-rays in energy range of 0.25 - 21.7 MeV with the flux of 2.1 × 104 - 1.2 × 107 photons/s and the energy spread of  2 – 15 % are produced during the test. This paper reports results of the commissioning of the SLEGS beamline.

submitted time 2022-06-13 Hits638Downloads179 Comment 0

2. chinaXiv:202206.00143 [pdf]

束团压缩

朱雄伟
Subjects: Physics >> Nuclear Physics

本文提出了束团压缩物理的产生背景,束团压缩的基本原理、种类。运用束流光学的基本理论,给出了
束团压缩的基本理论公式,论证了束团压缩的高阶限制。分析讨论了单级压缩、两级压缩中存在的设计
物理问题,总结了束团压缩设计中经常遇见的一些物理问题。关于束团压缩的束流动力学问题,给出了
束团压缩器中的粒子运动方程,以及完整的动力学方程-Vlasov方程。讨论了相干同步辐射效应和微束团
不稳定性。最后,分析了磁压缩器中的误差问题。

submitted time 2022-06-13 Hits800Downloads167 Comment 0

3. chinaXiv:202201.00064 [pdf]

Determination of neutron-skin thickness using configurational information entropy

Ma, Chun-Wang ; Liu, Yi-Pu; Wei, Hui-Ling; Pu, Jie; Cheng, Kai-Xuan; Wang, Yu-Ting
Subjects: Physics >> Nuclear Physics

Configurational information entropy (CIE) theory was employed to determine the neutron skin thickness of neutron-rich calcium isotopes. The nuclear density distributions and fragment cross-sections in 350 MeV/u 40-60Ca + 9Be projectile fragmentation reactions were calculated using a modified statistical abrasion-ablation model. CIE quantities were determined from the nuclear density, isotopic, mass, and charge distributions. The linear correlations between the CIE determined using the isotopic, mass, and charge distributions and the neutron skin thickness of the projectile nucleus show that CIE provides new methods to extract the neutron skin thickness of neutron-rich nuclei.

submitted time 2022-01-21 Cooperative journals:《Nuclear Science and Techniques》 Hits4102Downloads514 Comment 0

4. chinaXiv:202201.00065 [pdf]

Anisotropy flows in Pb–Pb collisions at LHC energies from parton scatterings with heavy quark trigger

Wang, Hai; Chen, Jin-Hui
Subjects: Physics >> Nuclear Physics

By implementing an additional heavy quark–antiquark pair production trigger in a multiphase transport (AMPT) model, we study the effect on anisotropy flows of identified particles with a focus on charged particles and quarkonium (J/Ψ and Υ). A systematic increase in the collision rate for active partons in the AMPT model with such an implementation has been observed. It leads to a slight increase of identified particles anisotropy flows as a function of transverse momentum (pT ) and rapidity, and gives a better description of the experimental data of elliptic flow toward larger pT . Our approach provides an efficient way to study the heavy quark dynamics in the AMPT model at LHC energies.

submitted time 2022-01-21 Cooperative journals:《Nuclear Science and Techniques》 Hits3816Downloads441 Comment 0

5. chinaXiv:202201.00035 [pdf]

基于氘核碎裂的高能中子束的产生机制的研究

Wang, Rensheng; Ou, Li; Xiao, Zhigang
Subjects: Physics >> Nuclear Physics

在改进的量子分子动力学模型框架下,研究了高能氘核在重靶核作用下的碎裂过程,尤其近零度角产生的中子。模拟重现了 102 MeV d+C 反应中实验测量的中子双微分截面。根据模型与实验结果的一致性,论证了通过氘核在碳靶上碎裂而产生高能中子束的可行性。但因氘核内部核子的费米运动,使得包含实验室0°在内的中子能量具有相当大的能量展宽。基于模型计算,通过测量氘核碎裂过程中出射的伴随质子,出射中子能量可约束在5%(1σ)以内。进一步,本工作论证了基于伴随质子测量的单能高能中子束产生的可行性。

submitted time 2022-01-07 Hits6453Downloads573 Comment 0

6. chinaXiv:202201.00011 [pdf]

Determination of neutron-skin thickness using configurational information entropy

Ma, Chun-Wang ; Liu, Yi-Pu ; Wei, Hui-Ling ; Pu, Jie ; Cheng, Kai-Xuan ; Wang, Yu-Ting
Subjects: Physics >> Nuclear Physics

Configurational information entropy (CIE) theory was employed to determine the neutron skin thickness of neutron-rich calcium isotopes. The nuclear density distributions and fragment cross-sections in 350 MeV/u 40060Ca + 9Be projectile fragmentation reactions were calculated using a modified statistical abrasion-ablation model. CIE quantities were determined from the nuclear density, isotopic, mass, and charge distributions. The linear correlations between the CIE determined using the isotopic, mass, and charge distributions and the neutron skin thickness of the projectile nucleus show that CIE provides new methods to extract the neutron skin thickness of neutron-rich nuclei.

submitted time 2021-12-31 Hits6154Downloads602 Comment 0

7. chinaXiv:202112.00131 [pdf]

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用CSHINE重建重离子反应中的裂变事件

刁昕玥; 关分海; 王轶杰; 秦雨浩; 秦智; 郭栋; 吴强华; 司大伟; 赵暄; 肖圣; 张耀鹏; 魏向伦; 邹海川; 杨贺润; 马朋; 胡荣江; 段利敏; Artur, Dobrowolski; Krzysztof, Pomorski; 肖志刚
Subjects: Physics >> Nuclear Physics

我们研究了在CSHINE上重建$ 25 MeV/u ^{86}Kr +^{208}Pb$ 反应中快裂变事件的方法。裂变碎片由三个大面积平行板雪崩计数器进行探测,它可以提供碎片的位置和到达的时间信息。起始时间信息由回旋加速器的高频信号给出。我们利用两个裂变碎片的速度,重建了裂变事件。裂变碎片的速度分布和方位差的展宽均随折叠角的增大而减小,这与快速裂变发生的图像一致。同时,裂变轴的各向异性角分布也一致地揭示了裂变事件的动力学特征。

submitted time 2021-12-25 Hits5818Downloads485 Comment 0

同行评阅专家: 梁灿;

8. chinaXiv:202103.00069 [pdf]

常规电子直线加速器的设计

朱雄伟
Subjects: Physics >> Nuclear Physics

本文讨论了常规电子直线加速器的设计问题, 并以一台 10 MeV 的电子直线加速器为例穿插其中讨论了常规电子直线加速器的设计。常规电子直线加速器由电子枪、聚束部分、光速部分所组成,而且在直线对撞机装置、自由电子激光装置中经常用到束团压缩部分。我们对每一部分都进行了分析与讨论,主要包括纵向、横向束流动力学方面, 总结了一系列的行之有效的设计思想与方法。

submitted time 2021-03-03 Hits10484Downloads1240 Comment 0

9. chinaXiv:202102.00080 [pdf]

Development of X-ray spectrometer automatic adjustment system based on global optimization algorithm

Fei Zhan
Subjects: Physics >> Nuclear Physics

In high energy resolution X-ray spectroscopy beamlines of synchrotron radiation (SR) facilities and laboratory XAS/XES spectrometer, it is important to keep X-ray spectrometer operating in optimal conditions. The adjusting process is normally very time consuming due to the irregular light source beam point, and it is difficult to get global optimum. This study aims to develop an intelligent adjusting system based on global optimization algorithm for spectrometers on SR beamlines and on laboratory x-ray source. First of all, based on the two dimensional experimental data, automatic adjustment process was established. Then the automatic optimization was applied to adjust X-ray spectrometer practically, and upgraded iteratively. The online testing is carried out on a self-developed laboratory XAS spectrometer. Online tests results show that this automatic adjustment process converges to the optimal solution quickly, and the convergence time is about several dozens to hundreds steps, more efficient than manual optimization process. After automatic adjustment, we can get correct X-ray absorption spectrum based on the adjusted spectrometer.

submitted time 2021-02-25 Hits16913Downloads1083 Comment 0

10. chinaXiv:201807.00040 [pdf]

加速器的百年历程

朱雄伟
Subjects: Physics >> Nuclear Physics

本文分析讨论了加速器的百年历史, 从思想的萌芽、理论的突破与准备、技术的准备与储存、实验的成功、加速器的未来与展望等几个方面进行了论述。

submitted time 2018-07-10 Hits4210Downloads2437 Comment 1

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