漂移管直线加速器高功率波导窗的物理设计

为了研发中国散裂中子源(CSNS)漂移管直线加速器(DTL)的功率耦合器,在对常规波导窗结构进行改进的基础上,设计了一种新型高功率波导窗。利用微波仿真软件CST优化了波导窗的高频传输特性,并采用ANSYS分析了波导窗在通功率时的温升及热应力以防止陶瓷片破裂,结果表明,波导窗能传输的最大平均功率达到了800 kW。校核了波导窗抽真空时的机械强度,并对陶瓷窗高频打火进行初步讨论,结果表明,漂移管直线加速器入腔功率为2 MW,小于波导窗的临界输入功率2.355 MW,窗内打火的机率很小。     

行波谐振环和陶瓷窗高功率老炼

为了老炼国家同步辐射实验室200 MeV直线加速器新陶瓷窗,制作了一个功率增益4.5,最高峰值功率60 MW的波导行波谐振环。对谐振环的工作原理和技术参数进行了简单介绍。对陶瓷窗功率老炼的步骤和应注意的技术细节进行了较详细的分析,提出了克服电子倍增效应的一些方法。陶瓷窗老炼峰值功率为30 MW,平均功率3.7 kW,脉冲长度2.5μs。     

行波谐振环和陶瓷窗高功率老炼

 为了老炼国家同步辐射实验室200 MeV直线加速器新陶瓷窗,制作了一个功率增益4.5,最高峰值功率60 MW的波导行波谐振环。对谐振环的工作原理和技术参数进行了简单介绍。对陶瓷窗功率老炼的步骤和应注意的技术细节进行了较详细的分析,提出了克服电子倍增效应的一些方法。陶瓷窗老炼峰值功率为30 MW,平均功率3.7 kW,脉冲长度2.5μs。     

ADS强流质子加速器低能传输段发射度匹配研究北大核心CSCD

研制了一套强流质子源及低能传输线(LEBT)注入器用于ADS质子直线加速器。质子源产生35 ke V强流束经过低能传输段聚焦进入射频四极(RFQ)入口。低能传输段不匹配是强流RFQ中引起束流丢失的主要原因。不同加速段的束流匹配是减少束流损失与抑制发射度增长的重要手段。束流损失导致RFQ电极表面受热变形进而引起高频打火,降低RFQ长期运行的稳定性。针对以上问题,研究LEBT发射度在不同的实验条件下如何实现加速器更好的匹配。研究结果表明,LEBT出口束流在35 ke V,10 m A下,束流发射度小于0.2πmm·mrad,当LEBT螺线管电流为210和270 A时,束流在RFQ入口满足匹配条件。     

CIAE重离子加速器物理研究平台

中国原子能科学研究院正在规划中的重离子加速器物理研究平台的基本方案是在 现有的HI-13串列加速器的后端新建一台能量增益为18MeV/q的重离子超导直线加速器.超导直线加速器包括: 36个铜铌溅射型四分之一波长(QWR)谐振腔; 9个恒温柜, 及一系列等时性消色散束流传输系统. 同时配套建设一条与现有的HI-13串列加速器相并列的重离子四杆型射频四极加速器——RFQ和交叉手指型漂移管直线加速器IH-DTL接受来自ISOL的正离子束,然后直接注入到超导直线加速器.     

ADS强流质子加速器低能传输段发射度匹配研究

研制了一套强流质子源及低能传输线(LEBT)注入器用于ADS质子直线加速器。质子源产生35 ke V强流束经过低能传输段聚焦进入射频四极(RFQ)入口。低能传输段不匹配是强流RFQ中引起束流丢失的主要原因。不同加速段的束流匹配是减少束流损失与抑制发射度增长的重要手段。束流损失导致RFQ电极表面受热变形进而引起高频打火,降低RFQ长期运行的稳定性。针对以上问题,研究LEBT发射度在不同的实验条件下如何实现加速器更好的匹配。研究结果表明,LEBT出口束流在35 ke V,10 m A下,束流发射度小于0.2πmm·mrad,当LEBT螺线管电流为210和270 A时,束流在RFQ入口满足匹配条件。     

等效电路模型在漂移管直线加速器场稳定性调制中的应用

漂移管直线加速器(DTL)通过采用杆耦合器加速结构,实现加速电场的稳定性。为了分析电场稳定性的调制机理,简要说明DTL的腔体结构,并对其进行集总参数的等效模拟,给出等效电路分布。最后着重对耦合杆与漂移管之间相互作用的等效电容进行了仿真研究。针对上述电路分布,采用电路理论分析了高频场扰动及稳定性的实现机理。通过将稳定结构下的等效电容求解结果与该电容的模拟仿真值进行比较,得出稳定状态下的耦合杆与漂移管之间间隙取值的合理区间。最后通过对不同调节条件下的扰动电场进行仿真分析,一定程度上验证了结论的正确性。     

近代物理讲座 第六讲 加速器(Ⅱ)

４．直线加速器直线加速器是最早发明的一种谐振式加速器．人们为了克服高压加速器所遇到的困难,探索了使粒子连续多次通过一个电压不很高的加速电场来获得高能量的方法．１９２４年Ｉｓｉｎｇ首先提出了可行的方案．１９２８年Ｗｉｄｒｏｅ建成了第一个直线谐振加速器．图１０是早期直线加速器的工作原理图．沿着直线排列一些金属圆筒状电极（称为漂移管）,奇数电极和偶数电极分别连接到高频电源的两个输出端上．当离子经过?...     

120 MW束流功率速调管电子枪设计

速调管电子枪是速调管重要部件之一,它为速调管高频腔提供直流电子注。对国产50 MW速调管电子枪束流光学系统进行了模拟分析,并对电子枪陶瓷筒进行了重新设计和优化。为了在国产30 MW速调管的基础上设计50 MW速调管,采用进口钡钨电子枪阴极来减小蒸发和抑制打火,将电子注电压提高到320 kV,电流和导流系数分别为346 A和1.91 μp,以满足速调管功率提高的需要。设计出低电场强度（22.1 kV/mm）电子枪新结构,即在不影响电子枪内部束流稳定的前提下,将陶瓷筒设计成靠近阴极端半径较大而远离阴极端半径较小的形状,以避免高功率运行致使陶瓷筒的损坏。     

120 MW束流功率速调管电子枪设计

 速调管电子枪是速调管重要部件之一,它为速调管高频腔提供直流电子注。对国产50 MW速调管电子枪束流光学系统进行了模拟分析,并对电子枪陶瓷筒进行了重新设计和优化。为了在国产30 MW速调管的基础上设计50 MW速调管,采用进口钡钨电子枪阴极来减小蒸发和抑制打火,将电子注电压提高到320 kV,电流和导流系数分别为346 A和1.91 μp,以满足速调管功率提高的需要。设计出低电场强度（22.1 kV/mm）电子枪新结构,即在不影响电子枪内部束流稳定的前提下,将陶瓷筒设计成靠近阴极端半径较大而远离阴极端半径较小的形状,以避免高功率运行致使陶瓷筒的损坏。     

RF power coupling for the CSNS DTL

The China Spallation Neutron Source (CSNS) drift tube linac (DTL) consists of four tanks and each tank is fed by a 2.5 MW klystron. Accurate predication of RF coupling between the RF cavity and ports is very important for DTL RF coupler design. An iris-type coupler is chosen to couple the RF power to the DTL accelerating cavity. The physical design of the DTL coupler and the calculations of RF coupling between the cavity and coupler are carried out. The results from the numerical simulations are in excellent agreement with the analytical results.     

RF power coupling for the CSNS DTL

The China Spallation Neutron Source(CSNS)drift tube linac(DTL)consists of four tanks and each tank is fed by a 2.5 MW klystron.Accurate predication of RF coupling between the RF cavity and ports is very important for DTL RF coupler design.An iris-type coupler is chosen to couple the RF power to the DTL accelerating cavity.The physical design of the DTL coupler and the calculations of RF coupling between the cavity and coupler are carried out.The results from the numerical simulations are in excellent agreement with the analytical results.     

Fabrication of the high power input coupler for BEPCⅡ superconducting cavities

The BEPCII storage ring adopts two 500 MHz superconducting cavities (SCC). Each one is equipped with a 500 MHz input power coupler. The coupler is to feed 150 kW power in continuous wave (CW) mode with both standing and traveling wave modes. Due to high power feeding and high frequency of the coupler, its fabrication is a big challenge. The fabrication started with two key components, the window and the antenna. Up to now, two sets including windows and antennas have beam made by IHEP. And a 270 kW RF power in CW has passed through the coupler during the high power test. The fabrication details are presented in this paper.     

Fabrication of the high power input coupler for BEPCⅡ superconducting cavities

The BEPCII storage ring adopts two 500 MHz superconducting cavities (SCC). Each one is equipped with a 500 MHz input power coupler. The coupler is to feed 150 kW power in continuous wave (CW) mode with both standing and traveling wave modes. Due to high power feeding and high frequency of the coupler, its fabrication is a big challenge. The fabrication started with two key components,the window and the antenna. Up to now, two sets including windows and antennas have been made by IHEP. And a 270 kW RF power in CW has passed through the coupler during the high power test. The fabrication details are presented in this paper.     

高功率CO_2激光器高反膜耦合窗热效应研究

为解决CO2激光器高反膜耦合窗在腔内高功率激光作用下产生的热效应问题,对耦合窗的温度场和热形变场进行了理论分析研究。通过谐振腔工作状态分析,首次提出了腔内振荡激光具有混合模式分布的表达式,并利用半解析热分析方法得出了在混合模式下耦合窗产生的温度场和热形变场的一般表达式,同时与将腔内激光分布作均匀分布、高斯分布假设下耦合窗的情况作了对比分析。研究结果,当腔内谐振功率为3800W、腔内激光混合模式分布时,耦合窗内表面中心最大热形变量约为0.91μm,作均匀分布、高斯分布假设分别造成最大热形变量偏小20.88%,偏大78.02%。     

165 GHz, 1.5 MW-coaxial cavity gyrotron with depressed collector

A further step in the development of a coaxial-cavity gyrotron operated in the transverse electric TE_-31,17 mode at 165 GHz is presented. The gyrotron has been equipped with a quasi-optical output system consisting of a Vlasov launcher with a single cut and two mirrors, one with a quasi-elliptic and the other with a nonquadratic phase correcting surface. The radio frequency (RF) power is transmitted through a single output window. A maximum output power of 1.7 MW has been achieved. At the nominal operational parameters an RF power of 1.3 MW with an efficiency of 27.3% has been measured. The efficiency increases to 41% in operation with a single-stage depressed collector     

Development of fundamental power coupler for C-ADS superconducting elliptical cavities

5-cell elliptical cavities have been selected for the main linac of the China Accelerator Driven subcritical System(C-ADS) in the medium energy section. According to the design, each cavity should be driven with radio frequency(RF) energy up to 150 kW by a fundamental power coupler(FPC). As the cavities work with high quality factor and high accelerating gradient, the coupler should keep the cavity from contamination in the assembly procedure. To fulfil the requirements, a single-window coaxial type coupler was designed with the capabilities of handling high RF power, class 10 clean room assembly, and heat load control. This paper presents the coupler design and gives details of RF design, heat load optimization and thermal analysis as well as multipacting simulations. In addition, a primary high power test has been performed and is described in this paper.