1.3 GHz 9单元Ichiro型模型铜腔的预调谐

 以常用的多单元超导腔预调谐方法为基础,搭建了一套完整的预调谐系统,并实现了超导腔预调谐测量的自动化。实验首先通过网络分析仪对超导腔进行测量,利用Labview进行数据采集,并协同控制步进电机。通过“拉小珠”的微扰法,测量沿小珠运动路径的场分布。编写了一套Java程序,通过矩阵运算,计算出9单元腔各个腔单元频率的校正量。根据计算结果对9单元腔的某个单元进行挤压或拉抻,经多次上述操作后,在较高精度范围内,可将9单元铜腔的每个腔单元调谐至预期的目标频率。     

Simulation of beam size multiknobs correction at the Accelerator Test Facility 2 at KEK

The ATF2 project is the final focus system prototype for the ILC and CLIC linear collider projects, with a purpose of reaching a 37 nm vertical beam size at the interaction point (IP). During the initial commissioning, we started with larger-than-nominal β-functions at the IP in order to reduce the effects from higher-order optical aberrations and thereby simplifying the optical corrections needed. We report on the simulation studies at two different IP locations developed based on waist scan, dispersion, coupling and β function multiknobs correction in the large β optics of ATF2, in the presence of two kinds of magnet inaccuracies (quadrupole gradient and roll errors) to generate all possible linear optic distortions at the IP. A vertical beam size which is very close to the nominal beam size is obtained based on the simulation study.     

国际直线对撞机研究现状及未来发展

文章介绍了国际直线对撞机(ILC)的科学目标及直线对撞机(LC)与强子对撞机(LHC)的关系.结合对正负电子直线对撞机历史的回顾及国际直线对撞机方案的选择,对国际直线对撞机的发展现状及未来发展趋势进行了介绍.对中国科学家在国际直线对撞机中所做的国际合作研究进行了简要的回顾,并强调了中国抓住国际直线对撞机国际合作机遇对中国科学发展的重要性.     

Optimization parameter design of a circular e+e- Higgs factory

In this paper we will show a general method of how to make an optimized parameter design of a circular e⁺e^- Higgs factory by using analytical expression of maximum beam-beam parameter and beamstrahlung beam lifetime starting from a given design goal and technical limitations. A parameter space has been explored. Based on beam parameters scan and RF parameters scan, a set of optimized parameter designs for 50 km Circular Higgs Factory (CHF) with different RF frequency was proposed.     

Study on the 1.3 GHz low loss shape superconducting cavities at IHEP

As part of the international research program on the superconducting cavity for the International Linear Collider (ILC) R&;D on the 1.3 GHz low loss superconducting cavities has been carried out at the Institute of High Energy Physics (IHEP) since 2005. A design of 1.3 GHz low loss cavity shape was proposed and six single-cell cavities of different niobium material were successfully fabricated with standard technology. In this study our priority was on large grain (LG) cavities. The two LG cavities were treated with complete procedures of surface treatments based on chemical polishing (CP) without electro polishing (EP) at IHEP. The two LG cavities and a fine grain cavity were sent to KEK for vertical testing. All the three cavities reached accelerating gradients higher than 35 MV/m and the maximum gradient of 40.27 MV/m was achieved in the LG cavity. This paper presents the process of the vertical RF tests and the comparison of the LG and fine grain cavities's performance.     

1D theory of laser plasma wake

In this paper, we get the 1D approximate analytical solution of the plasma     

MXene基单原子催化剂的制备及其在电催化中的应用

单原子催化剂具有高原子利用率、高催化活性和高选择性等优点,兼具了均相催化剂“独立活性位点”和非均相催化剂“易循环利用”的特点,有效解决贵金属昂贵稀少的缺陷。其中载体不仅能影响单原子的稳定性,还影响其电子结构,从而影响催化性能。作为一种新型二维无机材料,MXene具有比表面积大、带隙可调、导电性好和螯合位丰富等特点,是制备单原子催化剂的理想载体材料。本文简要总结了MXene的结构特点,综述了MXene基单原子催化剂的制备策略,并着重介绍了MXene基单原子催化剂在电化学能源转换领域的应用,包括析氢反应、氧电极反应、氮还原反应、二氧化碳还原反应,以及在电池储能方面的应用。最后,总结了当前MXene基单原子催化剂在研究和实用方面所面临的挑战与机遇。     

基于径向基函数神经网络的多关节机器人滑模控制器

针对具有不确定性的多关节机器人系统,提出了一种径向基函数神经滑模控制方法;该控制方案采用全局滑模面,将神经网络的非线性映射能力与滑模控制的特点相结合,利用径向基神经网络自适应学习系统不确定性的未知上界,消弱了由滑模控制产生的抖动,同时保证了系统的鲁棒性;基于李亚普诺夫定理给出了系统稳定性的充分条件;仿真结果表明,该方法具有良好的轨迹跟踪和速度跟踪性能,提高了对于建模误差和不确定干扰等因素的鲁棒性。     

“三明治”教学方法在工科有机化学课程中的应用

在应用型人才培养驱动下,探索了"三明治"教学方法在工科有机化学课程中的应用。首先对教学内容进行模块化建设,这有利于构建"三明治"教学主题,增强知识的系统性和对知识的应用能力;在"三明治"教学思想指导下,进行了相应的教学方法和考试方法改革,增强了实践性环节的比重和学生的参与度,凸显了学生为主体、教师为主导的教学模式。通过学生的成绩和问卷调查分析可知,学生学习的热情高,分析问题和解决问题能力、团队合作能力得到很大的提高,教学效果良好,适合应用型人才培养的要求。     

基于应用型人才培养的应用化学专业实践课程体系改革研究

在应用型人才培养驱动下,探索了应用化学专业实践课程体系的改革,以“精细化学品的合成与表征”和“精细化学品生产工艺”2个方面训练为目标,构建了“专业实验-实训-生产实习”为一体的专业实践课程体系;通过CDIO模式的教学方法改革,践行了专业实践课程对人才培养的要求,提高了学生应用知识解决实际问题的能力,达到了应用型人才培养的目的。