ADS 650 MHz medium beta cavity study and design

The Accelerator Driven Sub-critical System (ADS) is under development aiming at safe disposal of nuclear waste and providing electric power in China. The main accelerator of ADS is composed of two injector sections and one main linear acceleration section. The 650 MHz β=0.82 superconducting cavities will be adopted to accelerate the proton bunches from 360 MeV to 1.5 GeV in the medium energy section. This paper presents the study and design results of this kind of superconducting cavity.     

微脉冲电子枪动力学实验研究

微脉冲电子枪是一种利用次级电子倍增效应产生强流电子束的微波电子枪.使用氧化镁作为阴极材料进行了微脉冲电子枪的高功率热测实验, 给出了不同射频功率下的发射电流波形, 并观察到了高阶次级电子倍增效应.实验结果与稳态和瞬态粒子动力学以及模拟计算结果定性符合.     

An ADS 650 MHz medium beta cavity study and design

The Accelerator Driven Sub-critical System (ADS) is under development and aims at the safe disposal of nuclear waste and providing electric power in China. The main accelerator of the ADS is composed of two injector sections and one main linear acceleration section. The 650 MHz β=0.82 superconducting cavities will be adopted to accelerate the proton bunches from 360 MeV to 1.5 GeV in the medium energy section. This paper presents the study and design results of this kind of superconducting cavity.     

Experimental study on SC RF cavities by using China large grain niobium for ILC

Large grain niobium has the potential of simplifying the production sequence and consequently reducing the cost of the superconducting RF cavities for ILC. To investigate the feasibility of fabrication and the possibility to achieve high gradient by large grain cavities, two 1.3GHz cavities were made of China large grain niobium and a series of vertical tests were carried out following several different surfaces treatment procedures. Two cavities have both reached the high gradient of more than 43MV/m repeatedly and the maximum accelerating field of 47.9MV/m has been achieved by China large grain niobium. This paper introduces the features of the fabrication and surface treatments on the large grain cavities and presents the preliminary results of the research.     

梯形双梁结构超导偏转腔的优化设计北大核心CSCD

双梁结构超导偏转腔可对带电粒子束进行快速的偏转或旋转,具有紧凑、高效的特性,在超导自由电子激光、高能粒子对撞机等加速器装置中具有广泛的应用前景。该类型超导腔设计研究的一个重点是双梁形状的选择和尺寸的优化。针对中国科学院高能物理研究所提议建设的、基于超导直线加速器的X射线自由电子激光装置,采用CST MWS,CST PS,COMSOL,ANSYS等软件仿真手段,结合理论分析,完成了一款双梁形状为梯形的超导偏转腔的优化设计。该梯形双梁结构偏转腔具有良好的电磁和机械性能,同时,腔的尺寸更加紧凑,加工难度也有所降低。     

Design studies on the ERL-FEL test facility at IHEP, Beijing

A proposed compact ERL test facility at IHEP, Beijing, is presented in this paper, and includes the design parameters, the essential lattice, and the key components features, such as the photocathode DC gun and the CW superconducting accelerating structures. Some important beam physics issues such as the space charge effect, the coherent synchrotron radiation (CSR) effect and the beam break-up (BBU) effect are briefly described with the simulation results.     

基于超导直线加速器的XFEL初步方案

基于超导直线加速器的X射线自由电子激光(XFEL)是自由电子激光领域未来发展的一个重要方向。介绍了国际上Euro-XFEL及LCLS-II等超导XFEL装置的设计建造现状。在此基础上提出基于一台7GeV超导直线加速器的超导XFEL初步方案,给出主要设计参数,并讨论实现100~1000GW量级峰值输出功率的技术路线,包括提高峰值流强、采用波荡器磁场渐变技术等。