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Hybrid聚束器的场分布测量与调配

强激光与粒子束 2017年第6期29卷 91-96页

作者：赵世琦裴士伦高斌肖欧正中国科学院高能物理研究所粒子加速物理与技术重点实验室北京100049 中国科学院大学北京100049

Hybrid聚束器是一种同时包含驻波和行波电磁场的新型聚束器。为对其电场分布进行测量,针对此种复杂电场分布的特点,基于非谐振微扰原理,研制了一套能够灵活简便操作、具有较高精度的场分布测量平台,并使用该平台对Hybrid聚束器进行了场... 详细信息

Hybrid聚束器是一种同时包含驻波和行波电磁场的新型聚束器。为对其电场分布进行测量,针对此种复杂电场分布的特点,基于非谐振微扰原理,研制了一套能够灵活简便操作、具有较高精度的场分布测量平台,并使用该平台对Hybrid聚束器进行了场分布测量和调配。最终,经过多次测量与调配,Hybrid聚束器的实际冷测微波性能与模拟计算结果符合较好,轴向电场幅值平坦度显著提高,各加速单元间的腔间相移明显改善,使其满足设计要求。

关键词： Hybrid聚束器谐振微扰法非谐振微扰法场分布测量与调配

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3dB桥误差对能量倍增器性能的影响

强激光与粒子束 2012年第2期24卷 449-452页

作者：裴士伦裴国玺赵风利肖欧正中国科学院高能物理研究所北京100049

根据能量倍增器的工作原理,对3dB桥误差引起的能量倍增器性能变化进行了理论分析,并对BEPC和BEPCⅡ直线加速器所使用能量倍增器的3dB桥误差进行了讨论,为判断焊接后3dB桥桥臂波导变形提供了理论参考。结果表明:无论是功率分配不平衡,还... 详细信息

根据能量倍增器的工作原理,对3dB桥误差引起的能量倍增器性能变化进行了理论分析,并对BEPC和BEPCⅡ直线加速器所使用能量倍增器的3dB桥误差进行了讨论,为判断焊接后3dB桥桥臂波导变形提供了理论参考。结果表明:无论是功率分配不平衡,还是相位关系偏离,都会使部分功率反射回速调管。功率分配不平衡和微波相位关系偏离值越大,则功率倍增因子下降得越多。

关键词：能量倍增器 3 dB桥加工误差调试误差 BEPCⅡ直线加速器 RF脉冲压缩器

Design and simulation of a C-band SLED with mode converter

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Chinese Physics C 2014年第11期38卷 94-98页

作者：肖欧正 Institute of High Energy Physics Chinese Academy of Sciences

The transient response analysis of the SLED based on the equivalent circuit is described. Then, a C-band SLED using TE0,1,15 mode cylindrical cavity with TE10-TE01 mode converter has been designed. According to the main RF parameters of the accelerator, the coupling coefficient is optimized to obtain the maximum multiplication factor. The key components of the pulse compressor include a 3 dB directional coupler, a TE10-TE01 mode converter, and a cylindrical cavity, which are simulated and optimized using 3D electromagnetic field simulation software. In addition, the function defining the relation between the coupling factor and aperture size is derived by a mathematical fitting method.

关键词： pulse compressor energy multiplication factor mode converter 3 dB directional coupler couplingcoefficient

Beam dynamics studies of the photo-injector in low-charge operation mode for the ERL test facility at IHEP

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Chinese Physics C 2014年第6期38卷 86-92页

作者：焦毅肖欧正 Institute of High Energy Physics Chinese Academy of Sciences

The energy recovery linac test facility （ERL-TF）, which is a compact ERL-FEL （free electron laser） two-purpose machine, was proposed at the Institute of High Energy Physics, Beijing. As one important component of the ERL-TF, the photo-injector that started with a photocathode direct-current gun has been designed. In this paper, optimization of the injector beam dynamics in low-charge operation mode is performed with iterative scans using Impact-T. In addition, the dependencies between the optimized beam quality and the initial offset at cathode and element parameters are, investigated. The tolerance of alignment and rotation errors is also analyzed.

关键词： ERL photo-injector beam dynamics

Studies on an S-band bunching system with hybrid buncher

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Chinese Physics C 2013年第11期37卷 67-72页

作者：裴士伦肖欧正 Institute of High Energy Physics Chinese Academy of Sciences

Generally, a standard bunching system is composed by an SW pre-buncher, a TW buncher and a standard accelerating section. However, there is one way to simplify the whole system to some extent by using the hybrid buncher, which is a combined structure of the SW pre-buncher and the TW buncher. Here the beam dynamics studies on an S-band bunching system with the hybrid buncher is presented, and simulation results show that similar beam performance can be obtained at the linac exit by using this kind of bunching system rather than the standard one. In the meantime, the structure design of the hybrid buncher is also described. Furthermore, the standard accelerating section can also be integrated with the hybrid buncher, which can further simplify the usual bunching system and lower the construction cost.

关键词： beam dynamics bunching system hybrid buncher structure design

Error and jitter effect studies on the SLED for the BEPC Ⅱ-linac

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Chinese Physics C 2012年第5期36卷 456-463页

作者：裴士伦李小平肖欧正 Institute of High Energy Physics Chinese Academy of Sciences

An RF pulse compressor is a device used to convert a long RF pulse to a short one with a much higher peak RF magnitude. SLED can be regarded as the earliest RF pulse compressor to be used in large-scale linear accelerators. It has been widely studied around the world and applied in the BEPC and BEPCⅡ linac for many years. During routine operation, error and jitter effects will deteriorate the performance of SLED, either on the output electromagnetic wave amplitude or phase. The error effects mainly include the frequency drift induced by cooling water temperature variation and the frequency/Q 0 /β unbalances between the two energy storage cavities caused by mechanical fabrication or microwave tuning. The jitter effects refer to the PSK switching phase and time jitters. In this paper, we re-derive the generalized formulae for the conventional SLED used in the BEPCⅡ linac, and the error and jitter effects on SLED performance are also investigated.

关键词： error effect jitter effect BEPC Ⅱ linac SLED RF pulse compressor

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C波段能量倍增器的研制

强激光与粒子束 2014年第6期26卷 289-292页

作者：赵风利王湘鉴束冠肖欧正贺祥张敬如中国科学院高能物理研究所北京100049

C波段(5712 MHz)能量倍增器——SLED是我国研制的首台C波段能量倍增器。简述了利用三维电磁场仿真软件HFSS和CST对C波段能量倍增器的高品质因数储能腔、耦合孔、3 dB桥等进行优化设计的情况,对加工的能量倍增器做了射频低功率测试,实验... 详细信息

C波段(5712 MHz)能量倍增器——SLED是我国研制的首台C波段能量倍增器。简述了利用三维电磁场仿真软件HFSS和CST对C波段能量倍增器的高品质因数储能腔、耦合孔、3 dB桥等进行优化设计的情况,对加工的能量倍增器做了射频低功率测试,实验测试和理论计算的一致性很好,测试结果表明所有技术参数指标均达到了设计要求。

关键词： C波段能量倍增器储能腔耦合系数低功率测试峰值功率增益

Design and simulation of a C-band pulse compressor

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Chinese Physics C 2012年第4期36卷 376-379页

作者：肖欧正赵风利贺祥 Institute of High Energy Physics Chinese Academy of Sciences

The design and optimization procedure of a pulse compressor is presented. A C-band （5712 MHz） pulse compressor using a TE0,1,15 mode cylindrical cavity with dual side-wall coupling irises has been designed. Also the... 详细信息

关键词： pulse compressor energy multiplication factor coupling coefficient

Analysis and simulation of a coupled-cavity pulse compressor

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Chinese Physics C 2012年第11期36卷 1132-1135页

作者：肖欧正赵风利贺祥 Institute of High Energy Physics Chinese Academy of Sciences

An equivalent circuit model is built for a coupled-resonator pulse compressor. Based on the circuit, the general second order differential equation is derived and converted into the first order equation to save computing time. In order to analyze the transient response and optimize parameters for the pulse compressor, we have developed a simulation code. In addition, we have also designed a three-cavity pulse compressor to get the maximum energy multiplication factor. The size of the cavities and coupling apertures is determined by HFSS.

关键词： pulse compressor power gain energy multiplication factor