In laser wakefield acceleration,injecting an external electron beam at a certain energy is a promising approach for achieving a high-quality electron beam with low energy spread and low emittance.In this paper,the pro...In laser wakefield acceleration,injecting an external electron beam at a certain energy is a promising approach for achieving a high-quality electron beam with low energy spread and low emittance.In this paper,the process of laser wakefield acceleration with an external injection at 10 pC has been studied in simulations.A Bayesian optimization method is used to optimize the key laser and plasma parameters so that the electron beam is accelerated to the expected energy with a small emittance and energy spread growth.The effect of the rising edge of the plasma on the transverse properties of the electron beam is simulated and optimized in order to ensure that the external electron beam is injected into the plasma without significant emittance growth.Finally,a high-quality electron beam with an energy of 1.5 GeV,a normalized transverse emittance of 0.5 mm·mrad and a relative energy spread of 0.5%at 10 pC is obtained.展开更多
本文介绍了BESIII离线数据处理软件系统的构成以及数据处理的主要流程;给出了利用工具软件TAU(Tuning and Analysis Utilities)对系统性能进行的测试结果,据此结果估算了BESIII实验所需的计算资源,并且与BESIII设计报告的相关部分进行比...本文介绍了BESIII离线数据处理软件系统的构成以及数据处理的主要流程;给出了利用工具软件TAU(Tuning and Analysis Utilities)对系统性能进行的测试结果,据此结果估算了BESIII实验所需的计算资源,并且与BESIII设计报告的相关部分进行比较,说明了BESIII计算机环境的设计基本满足BESIII离线数据处理的要求。展开更多
基金supported by Science and Technology Major Project of Hubei Province in China(No.2021AFB001)。
文摘In laser wakefield acceleration,injecting an external electron beam at a certain energy is a promising approach for achieving a high-quality electron beam with low energy spread and low emittance.In this paper,the process of laser wakefield acceleration with an external injection at 10 pC has been studied in simulations.A Bayesian optimization method is used to optimize the key laser and plasma parameters so that the electron beam is accelerated to the expected energy with a small emittance and energy spread growth.The effect of the rising edge of the plasma on the transverse properties of the electron beam is simulated and optimized in order to ensure that the external electron beam is injected into the plasma without significant emittance growth.Finally,a high-quality electron beam with an energy of 1.5 GeV,a normalized transverse emittance of 0.5 mm·mrad and a relative energy spread of 0.5%at 10 pC is obtained.
文摘本文介绍了BESIII离线数据处理软件系统的构成以及数据处理的主要流程;给出了利用工具软件TAU(Tuning and Analysis Utilities)对系统性能进行的测试结果,据此结果估算了BESIII实验所需的计算资源,并且与BESIII设计报告的相关部分进行比较,说明了BESIII计算机环境的设计基本满足BESIII离线数据处理的要求。
