为了提高对撞亮度,继续保持北京正负电子对撞机(Beijing Electron Positron Collider,BEPC)在世界同类装置中的领先地位,北京正负电子对撞机重大改造工程BEPCⅡ于2001年夏启动,于2009年7月通过国家验收。对BEPCⅡ控制系统进行了重建,该...为了提高对撞亮度,继续保持北京正负电子对撞机(Beijing Electron Positron Collider,BEPC)在世界同类装置中的领先地位,北京正负电子对撞机重大改造工程BEPCⅡ于2001年夏启动,于2009年7月通过国家验收。对BEPCⅡ控制系统进行了重建,该系统采用分布式体系结构,使用系统集成工具EPICS(Experimental Physics and Industrial Control System)进行开发。BEPCⅡ控制系统于2006年11月建成并投入使用,目前系统运行正常,达到了设计指标。本文将介绍新的BEPCⅡ控制系统。展开更多
The superconducting cryogenic system has been designed and deployed in the Beijing Electron-Positron Collider Upgrade Project(BEPCⅡ).Process variables,including the pressure,level,flow and so on,are manipulated to ge...The superconducting cryogenic system has been designed and deployed in the Beijing Electron-Positron Collider Upgrade Project(BEPCⅡ).Process variables,including the pressure,level,flow and so on,are manipulated to get the liquid helium,two-phase helium flow and supercritical helium flow,which are used to cool down the three kinds of superconducting devices respectively.The system fully automates the superconducting cryogenic control with the structure of EPICS+PLC.EPICS is used to take charge of the process control,the logical control and the PID control loops whereas the low level interlocks of the pivotal equipments are run in PLCs to protect the superconducting device from damage.展开更多
To monitor the beam profile at the end of the linac non-destructively, a wire scanner as a new diagnostic instrument was designed, manufactured and installed in 2007. Since then, several measurements have been carried...To monitor the beam profile at the end of the linac non-destructively, a wire scanner as a new diagnostic instrument was designed, manufactured and installed in 2007. Since then, several measurements have been carried out using this device. This paper describes the whole system of the wire scanner and the testing results.展开更多
BEPC Ⅱ, the upgrade project of Beijing Electron Positron Collider （BEPC）, is an accelerator with large beam current and high luminosity, so an efficient and stable injector is required. Several beam diagnostic and ...BEPC Ⅱ, the upgrade project of Beijing Electron Positron Collider （BEPC）, is an accelerator with large beam current and high luminosity, so an efficient and stable injector is required. Several beam diagnostic and monitoring instruments are used. A new diagnostic instrument - wire scanner, has been designed and will be used to measure the profile of the linac beam of BEPC Ⅱ. This paper describes the prototype of this system and the cause of heat generating of the wire. Some simulation results of the heat and force by using finite element method software-ANSYS are presented and discussed.展开更多
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 acceler...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.展开更多
中国科学院高能物理研究所加速器控制系统广泛采用EPICS组态软件,EPICS包括很多的组件工具,这些工具有各自的风格,相互之间独立,彼此之间交换数据较麻烦,基于此,DESY、SNS等实验室联合开发了能将各工具集成到统一平台的软件包--CSS(Cont...中国科学院高能物理研究所加速器控制系统广泛采用EPICS组态软件,EPICS包括很多的组件工具,这些工具有各自的风格,相互之间独立,彼此之间交换数据较麻烦,基于此,DESY、SNS等实验室联合开发了能将各工具集成到统一平台的软件包--CSS(Control System Studio)。CSS是基于Eclipse RCP框架结构,由Java语言开发,具有易移植性、易操作性、丰富的人机界面等优点,更加符合现代控制系统的需要,在加速器行业得到广泛的应用。展开更多
文摘为了提高对撞亮度,继续保持北京正负电子对撞机(Beijing Electron Positron Collider,BEPC)在世界同类装置中的领先地位,北京正负电子对撞机重大改造工程BEPCⅡ于2001年夏启动,于2009年7月通过国家验收。对BEPCⅡ控制系统进行了重建,该系统采用分布式体系结构,使用系统集成工具EPICS(Experimental Physics and Industrial Control System)进行开发。BEPCⅡ控制系统于2006年11月建成并投入使用,目前系统运行正常,达到了设计指标。本文将介绍新的BEPCⅡ控制系统。
文摘The superconducting cryogenic system has been designed and deployed in the Beijing Electron-Positron Collider Upgrade Project(BEPCⅡ).Process variables,including the pressure,level,flow and so on,are manipulated to get the liquid helium,two-phase helium flow and supercritical helium flow,which are used to cool down the three kinds of superconducting devices respectively.The system fully automates the superconducting cryogenic control with the structure of EPICS+PLC.EPICS is used to take charge of the process control,the logical control and the PID control loops whereas the low level interlocks of the pivotal equipments are run in PLCs to protect the superconducting device from damage.
基金Partly supported by JSPS & Core University Collaboration Foundation
文摘To monitor the beam profile at the end of the linac non-destructively, a wire scanner as a new diagnostic instrument was designed, manufactured and installed in 2007. Since then, several measurements have been carried out using this device. This paper describes the whole system of the wire scanner and the testing results.
文摘BEPC Ⅱ, the upgrade project of Beijing Electron Positron Collider （BEPC）, is an accelerator with large beam current and high luminosity, so an efficient and stable injector is required. Several beam diagnostic and monitoring instruments are used. A new diagnostic instrument - wire scanner, has been designed and will be used to measure the profile of the linac beam of BEPC Ⅱ. This paper describes the prototype of this system and the cause of heat generating of the wire. Some simulation results of the heat and force by using finite element method software-ANSYS are presented and discussed.
基金Supported by the National Natural Science Foundation of China (11105164)
文摘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.
文摘中国科学院高能物理研究所加速器控制系统广泛采用EPICS组态软件,EPICS包括很多的组件工具,这些工具有各自的风格,相互之间独立,彼此之间交换数据较麻烦,基于此,DESY、SNS等实验室联合开发了能将各工具集成到统一平台的软件包--CSS(Control System Studio)。CSS是基于Eclipse RCP框架结构,由Java语言开发,具有易移植性、易操作性、丰富的人机界面等优点,更加符合现代控制系统的需要,在加速器行业得到广泛的应用。
