ID181: The Shareable Image Library Of BEPC Control System

Chunhong wang, Jijiu zhao

Institute of High Energy Physics, Chinese Academy of Sciences

P.O. Box 918-10, Beijing 100039, China

There are many application processes and object module libraries in BEPC control system. Each process must be linked to these object module libraries to create a executable image. So, total time of linking the object modules are increased. Each process takes up more space in physical memory and more disk storage. These shortcoming trouble the system maintenance. Using a shareable image library overcomes these dis- advantages. This paper describes the method and procedure for developing the shareable image library of the BEPC control system.

Submitted by: Wang chunhong
Full address: IHEP, P.O. Box 918 Beijing, 100039, P.R. China
E-mail address:
Keywords: shareable image, control system

ID183: Xwin -- A Graphical User Interface Developing Toolkit for Workstations

Ger Lei , Jijiu Zhao

Institute of High Energy Physics, Beijing, P. R. China

Graphical User Interface is an essential part of accelerator control applications. The authors of this paper have developed a software toolkit called Xwin for easily creating graphical user interface for control applications. Based on X window system and OSF/Motif, Xwin is a sharable library on workstations, providing a complete set of functions to construct graphical user interface, especially for drawing graphical elements and displaying scientific data. Xwin is a nice facility for building control systems.

Key words: Graphical User Interface,Man-Machine Interaction, X Window System, Motif, Widget

ID184: The prototype of VME-based Front-end System for T-C Factory Control System

F. Zhang, J. Zhao

Institute of High Energy Physics, Beijing, P.R.China

The VME-based prototype is aimed at researching some basic technical matters in the Front-end system of T-C factory control system. Hardware and software aspects of the prototype system will be dascribed in this paper. In particular, We will discuss embedded system generator:vmexgen, network download, multiprocessor operation, Interrupt Service Routines(ISR), I/O device driver and VMEexec Network Environment(VNE).

Submitted by: F.Zhang
Full address: P.O.Box 918(10) Beijing 100039, R.P.China
E-mail address:
Fax number: 86 10 6821 3374
Keywords: network download, multiprocessor operation, Interrupt Service Routines(ISR), I/O device driver and VMEexec Network Environment(VNE)

ID185: A Multifunctional Magnetic Measurement Control System for NSRL Magnets

Shen Lianguan, Yao Chengui, Qian Zexu

Department of Precision Machinery & Precision Instrumentation , University of Science and Technology of China ** National Synchrotron Radiation Laboratory, University of Science and Technology of China

This paper describes a new multifunctional magnetic field measurement control system. The facility is developed for a variety of measurement objects, such as dipole, multipole, undulator, etc. The development is based on the existing three coordinate scanning machine which was a component of an original measurement facility used in NSRL in 80*s. The system employed an IPC( Industrial Personal Computer) as central controller. It performs all the functions of controlling movement of probe, data acquisition and data analysis. Its 14 slots passive backplane provided the possibility of high integration of the system. All interface cards can be installed in it. The system uses advanced modular PLC and RLC products to take out tasks in physical layer. they make the system more compactly laid out and easy to operate. All of them are PC based and easy to be substituted or promoted. A three axis servomotor position control card is used to replace the FUNAC dedicated unit. In this way, the expenses are much cheaper than repairing FUNAC dedicated computer. The efforts in software focuses to get high positioning accuracy and extend the functions of the system. The most efficient measurements are following: The first method is to set up an absolute coordinate origin for creating a reliable datum point for the measurement system. In this way, the absolute origin position has no theoretical error. The second method is to allocate a measurement start point when every measurement starts. As a result of it the big backlash of several hundred of the main shaft can be ignored completely. The restriction on utilizing the existing mechanical structure and semi-closed control mode limited the position repeatability of obtained, and the definite position of the probe can*t be read out due to the accumulative error. In the case, The system is incapable of serving for the undulator which field varies with the location precipitously . Adding a laser measurement device to determine th position of the probe has greatly improved the performance of the system. the readings of the probe*s position are accurate within 0.0001 mm. The system was well running for measuring and shimming the undulator of more than 2 meters long which has been installed in HLS storage ring. The result measured indicated that the performance of the system is good enough for measuring mentioned above. The system shows high accuracy, smart flexibiliy and integration.

keywords: multifunction, magnetic field measurement, flexibility

ID186: Upgrading a Small Accelerator Control System

Li Jia Qing, Zhang Lin, Lu Cheng Rong

Accelerator laboratory Fudan University, Automatic energy scanning system

In Fudan accelerator lab. there is a 9SDH-2 Pelletron accelerator with terminal voltage of 3MV from NEC,U.S. Even though it has been running for 10 years, but still works well, verv stable and less maintenance. This machine is an early product of 1987,it basically a manual operated machine. In 1995,we germinated an idea to upgrade the machine control system with computer add so as to improve the feature of machine operation and started to work on it since then. Under some constraints such as the lack of man power, limit financing and busy beam time to the machine in lab, the whole process of the upgrading have to go on step by step from very beginning. On the premise of keeping the integrity of original control system, transform some controllers on accelerator control svstem to satisfy computer interface need and produce different kind of private hardwares and softwares. At the earlv stage of upgrading, we select a subject of "Automatic energy scanning system" as our first goal of whole long range plan because it related to less adjustment parameters relatively, but involve a series of key problems to be dealt with. From which we can expect to get more experiences on hardwares and softwares producing and data base management for further upgrading to the original control system later. The computer control system composed in Master slave architecture. A PC-486 compatible is the main part in Master. It manages the user friendly interface data base management., communication with Slave through serial port RS-232 and monitoring the readout acquired from Slave etc. The Slave is a STD Bus microcomputer system used for A/D conversion, DIA output, I/O Interface online monitoring terminal voltage and beam current and carrying out its PID control etc. This paper will give a description of what we have made to the "Automatic energy scanning systems.

Key Words: Accelerator Control System

ID187: The PC-Based Computer Control and Data Acquisition System of PKUAMS*

Lu Xiangyang, Li Bin, Wang Jianjun, Guo Zhiyu, Li Kun

1. Dept. of Technical Physics, Peking University, Beijing 100871, P.R.China

2. Institute of Heavy Ion Physics, Peking University

The Peking University Accelerator Mass Spectrometry (PKUAMS) is based on a EN tandem and has the independent multi-target spatter ion source and high energy analysis beam line. The AMS group is concentrated on the development of AMS technique and join the application research on the several science area, such as geology, archaeology, environment and biomedicine, et al.. To satisfy the needs of * project of Xia-Shang-Zhou Chronology *, the IHIP decided to modify the EN system, not only to rebuild the beam line, but also to up grade the control and data acquisition system with computer control. Although, for the lowest cost, one PC is qualified all of the device control and data acquisition job, the better design is to separate the device control and data acquisition to two independent system. The devices to be controlled are arranged along the beam line and at different electrical levels, these are the Ion Source Potential£¨-70 ~ -100KV), Pre-acceleration Potential£¨-50 ~ -80KV£© and Ground Potential. The farthest distance from the control room is about 70 meters. According to this situation, we choose the ControlNet system production, Group3 Tech. Ltd, New Zealand. The Loop Controller (LC) is housed in a Industrial PC 486. The Device Interfaces (DIs) are placed close to the controlled apparatus. LC to DI, DI to DI are connected by fiber optic cable. The control software is LabVIEW* (for Windows* 3.x). Data acquisition include two aspect jobs: the isotopes alternate injection control, synchronously measure the isotopes and the ion source target control; the data on-line process, to make the data record file. The data acquisition is performed by a Pentium* PC associated by a PC based dual-parameter spectrometry to process the rear isotope counts which is detected by a gas-filled detector.

* Supported by NSFC.

Submitted by: Lu Xiangyang
Full address: Dept. of Technical Physics Peking University Beijing 100871, P.R.China

ID188: A VME/DSP System For Data Acquisition And Feed Back Control

Shuge Jiang Yu Wang Yanfang Wang

Fast Electronics Lab, Modern Physics Dept, USTC

Data acquisition and feed back control are basic tasks in experimental physics. A VME based framework dealing with such tasks was intruduced in this article. Front-end modules were designed for multichannel analog signals amplifying, conditioning and digitizing. DSP array modules were
also inducted for real time data processing and feed back control. A 68060 embeded controller running the VxWorks real time operation system was used as both a controler of the system, and interface to outside world. All boards we use are VME 6U modules. In order to easer integration, they were designed as building blocks. Front-end modules could be easy added for large number of channels. More DSP modules could be added for more complex algorithm.

Keywords: Data Acquisition, Feed back control,VME, DSP
Submitted by: Yanfang Wang
Full address: Fast Electronics Lab, Modern Physics Dept., P.O.Box 4, Hefei, Anhui 230027,
P.R. China
Telephone: +86-551-3603114
Fax number: +86-551-3601164

ID189: Remote Console System using JAVA Applets for High Energy Accelerator Components at the Photon Factory

Noriichi KANAYA, Seiji ASAOKA and Hideki MAEZAWA

Photon Factory High Energy Accelerator Research Organization (KEK) 1- 1, Oho, Tsukuba, 305, Japan

The Remote Console System for accelerator components has been designed and implemented using Java Applets at the Photon Factory. Consoles in the control room tend to be generally large and heavy displays, X-terminals and workstations. When one of the accelerator components malfunctions during the operation of the accelerator, it is important for the machine group to be able to inspect the faulty component at the vicinity of the accelerator in order to recover the accelerator a(W ^AM-^I^B@^A Q^_M-PM-^\ ^AM-dZ ^AM-^X 1@^AM-^I^B@^AhM-^] ^As fast as possible. Thus, the Remote Console System has been implemented using Java Applets in particular for the twenty-two synchrotron radiation beam lines and Ultra-High-Vacuum pressures of the 2.5 GeV storage ring. As a result, even small portable laptop personal computers and PCs can provide the same control information on its thin Liquid-Crystal-Display as those on the heavy consoles at the control room. The Remote Console System on a WWW browser allows to analyze operation of the synchrotron radiation beam lines at any place without directly accessing the control room. When invoked, the WWW browser initiates the Remote Console System running on an SGI workstation through the network. The Remote Console System then fetches operational information and control data from a remote host computer, the VAX/VMS workstation, across the network, that controls the synchrotron radiation beam lines. Finally, the Remote Console System displays the operational and control information on the WWW browser as the console screen. The Remote Console System using Java Applet is applicable to various accelerator components.

Author's Name : Noriichi KANAYA, Seiji ASAOKA and Hideki MAEZAWA
Full address : Photon Factory, High Energy Accelerator Research Organization (KEK) 1-1, Oho, Tsukuba, 305, Japan
e-mail :
FAX: +81-298-64-2801
keywords : Java, Applet, accelerator, synchrotron radiation source

ID190: Analysize and Optimige of Low RF System

Huang Gang

The RF system of eletron circle accelerator include high power amplifier and low level-loop. The interaction and cure among the current of generator, current of beam and the amplitude of cavity is vety complex. This paper mainly discuss the problems we'll met in designing and analysising low level loop based on the model of Pederson and get some useful result. In the transfer function between cavity and beam we added an impadence, We also do some research work about two cavity but each cavity voltage have some difference on amplitude and phase. We used MATLAB language and SIMULINK to analysis the frame straightly.

ID191: The Research and Industrialization of Accelerator Control System for Container On-line Inspmtion

Hua li, Wang renhua, Zhang huayi

Accelerator Research Department, Tsinghua Universfty

Container On-line Inspecfion System is a kind of advanced inspection technology, which is used widely at the Customs, harbors, ports etc. The first model machine TH-SCAN System in China was developed in Tsinghua University in 1995. It's the high time to achieve its industrialization now. As the most important part of the system , the accelerator system THL-9 should be controlled safely, efficiently and easy for operation. This paper offered an improved design to discuss how we can reach this aim. THL-9 can be devided as beam system comprised of electron gun, accelerator tube and target etc, klystron modulator system, focus coils power system, vacuum system, gas supply system, cooling system and safety system etc. After variable simplification, there are about 86 digital signals and 22 analogous signals need to be controlled. Our control system is comprised of a computer and a programmable controller(CQMI), which are connected by RS-232C cable and construct a simple distributed system. The PC(CQMI) performs the control funcfion independently, and transfers necessary informafion to the computer. The computer stores , analyzes and displays the data. The interface is programmed and operated under Windows 95. Besides the computer, there is a control panel and some switches and a monitor meter are set on it. By operating the switches, we can control the accelerator easily. This design takes advantage of the reliability and exquisiteness of the CQM1, which can deal with digital signals efficiently. Analogous signals are given by the meter directly, for analoguous modulation has faster respondence. Although the system can be operated without the computer safely, the computer gives us a wonderful interface and let the operator have more information about the condition of the accelerator system. The data stored by the computer will be useful for further analysis. Furthermore, this system can be expanded and developed quite easily. Above all , Compared with the former system, the cost is reduced dramatically.

KEYWORDS: Accelerator, Programmable Controller, Serial Communication, Host-Link, Analoguous modulation

ID192: Isolation Technique used in HIRFL Control System

Chu Zhensheng IMP

The Chinese Academv of Science, LANZHOU,730000, CHfNA

HIRFI, is a large and complex system. The devices distribute widely over the site of HIRFL. Many of them are devices with great power and high precise. and in the evil environment. The isolation technique presented in this paper is one of the most important measures for HIRFL control svstem to protect control devices from the environment. 1. In HIRFL control svstem, two kinds of isolation technique are used in the transfer of control and data information flow, thev are pulse transformer isolation and photoelectric isolation. (I ) Pulse transformer isolation transfer. 1) U-port module was used in CAMAC serial loop. 2) ER16VM was used in the control system of SSC injection and extraction with the pattern of master and slave. (2) Photoelectric isolation transfer. The parallel mode of step-wise isolation of photoelectric couplers, which designed by our staff was used in the control system of SFC and in that of ECR source beani line which were both finished in 1992. The satisfactory result was obtained. 2. Photoelectric couplers was generally used in the transfer of digital signals. 3. Disturbance will effect the measuremeiit of high precise analog signals. In order to avoid it, several measures were adopted. It has been proved that reliability can be achieved, if certain isolation technique is accepted in both digital signals and analog signals in computer control svsteiii of HIRFL.

Keywords: Isolation Technique

ID193: Control System of Beam Diagnostic for HIRFL

Zheng Jianhua IMP

The Chinese Academy of Science, LANZHOU,730000, CHINA

The control system of beam diagnosis for HIRFL had been developed and used for years, and the system is being improved continuously to satisfy the requirement of the operation and beam tuning of HIRFL. The system is a distributed computer system and can be divided into three layers. In the top layer, the computer control station manages the diagnostic system of HIRFL and offers man- machine interfaces and operation fuctions used by operators. In the middle layer, theCAMAC system with serial highway and modules may receive commands from the computer and returns the information of status and measurement. In the bottom layer, a variety of beam diagnostic devices along the beam lines and inside SFC and SSC are installed for measuring the beam qualities and phsical parameters of accelerators.The main probes in beam diagnostic system for HIRFL are: Radial probes are set to measure the beam density, orbit location and vertical position inside SFC and SSC. Farady cups are set to measure the beam intensity and the efficiency of beam transportation. The secondary emission multi-wire profile monitors are set to measure the beam profile and position in beam line. The capacitive phase probes are used to measure the central phase and to display the phase history. Slit system are set to improve the beam emittance and the measurement of energy and energy dispersion. The measurement of beam profiles and beam emittance by the method of using fluorescent screens are being developed and will be used on ECR beam line. The beam diagnostic system for HIRFL is a branch of HIRFL control and is also an independent control system. The computers for diagnostic system will be linked with the network of HIRFL control. The improvement.of software, based on the windows programing technique, are being developed to analyse beam data obtained from the probes. The beam qualities are computed out and their graphics are displayed on the computer screen that makes beam tuning conveniently.

Key Words: HIRFL, beam diagnostic, SFC, SSC

ID194: The Control Software Based on Windows

Gao weizheng, Huang xinmin

Institute of Modem Physic, Lanzhou, Gansu, China

The task of accelerator is always taken by mini-computer because it has many devices to be control and task is very complex. The control software is based on UNIX and like such operating system that is usually adopted by the mini-computer. Today, as the function of personal computer(PC) improved, the ability of handle matters of PC as high as,mini-computer, and the price is far cheaper than mini-computer. So we can designate many control tasks to PC, and, the software developed should run smoothly on the OS of PC. In these papers, we have developed some control software that runs on WINDOWS. We use the Borland C++ as kits to develop the control software which orients object. We regard devices, such as pro-, post- transfer beam line, inject-eject, main mai,met, and so on, as some kinds of class that have some same character which derives from a base class named PowerClass. We develop the special functions respectively. The PowerClass is developed to manage the hardware that directly connects with some devices. To the user, the PowerClass can be considered as device driver. It can save lots of time in developing software. If we change the hardware sometime, the software is to be infected very limited, because the only thing we need to do is to revise the device driver--PowerClass, and the derived classes needn't change. Further more, the PC network offer a easy way to realize the divide of labor and centralized management of control. All the soft, like other Windows soft, have a good user interface, and all operations can be finished through mouse. Some advantages provided by Windows can be used to improve our new control soft. For example, we can introduce Database to manage the data of accelerator by Windows's DDE or OLE.

ID195: An Idea on Adaptive Optimal Control of SFC

Zhang Guixu Humg Tuanhua IMP

The Chinese Academy of Science,LANZHOU,730000,CHINA

The idea of application of optimal control theory to the computer control system of SFC is presented. The process consists of mathematical modeling of SFC, parameter identification, designing of the fastest response controller and the techniques of realizing adaptive control. HIRFL is a large and modem scientific facility in our institute, SFC is the injector of HIUL. It is very important to match SFC with an automatic control system. Unfortunately, the application of optimal and adaptive control theories has not been realized to the control of SFC up to now. 1. Mathematical Model' of SFC Before solving the optimal control problem, the mathematical modeling of SFC must be obtained. In this section, we shall outline the general representation of the dynamic models and the procedures that are used to obtain dynamic models of SFC and its components. There are some methods to get mathematical modeling of SFC. We can get it through Physical Principles of SFC and its components, or by means of parameter identification. 2. The Fastest Response Controller Design The expected beam-quality vector is expressed as follows: r(t)=[r1(t), r2(t),...,rm(t)] Where r(t) is an m-dimension step-ftmction vector, r1, r2, ..., rm are constants. The function of the fastest response controller is to bring the beam qualities from the initial vector y(0) = 0 to the expected vector y(N) = [ri,r2,...,rm], with the minimal sample-control times and without the occurrence of oscillations. 3. The State Observer Design As has been seen, optimal controllers need state feedback. Therefore, the control theory will always recommend to design a state observer to make an estimate of the state values. 4. The Realization of Adaptive Control It should be pointed out that a designed optimal controller could actually be changed into a nonoptimal controller over a long period of time. This would be due to the parameters of SFC gradually shifting after a long period of operation. To prevent this, we must consider the use of adaptive control techniques. Recently, a number of adaptive control algorithms have been proposed. The dynamic parameters of SFC would be updated 'in ever sampling period.

Submmitted by: Zhang Guixu Humg Tuanhua
Full address: IMP,the Chinese Academy of Science,LANZHOU,730000,CFHNA
Key words: HIRFL, SFC, Beam-quality, The Fastest Response Controller

ID196: An Idea of Improvement in Beam Diagnostic System of Central Region in SSC

Fang Liming Zhang Guixu Chu Zhengsheng

IMP, the Chinese Academy of Science, LANZHOU,730000

As the "eyes" of Accelerator, Beam Diagnostic devices play a very important role in Beam tuning and improving beam quality. In the paper, the status of the Beam Diagnostic System in the central region of HIRFL SSC, the improving work which had been done, and the further expecting of the Beam Diagnostic System are described. The Beam Diagnostic System in central region of MRFL SSC is an independent system that consisted of a personal computer, CAMAC serial loop and function modules, some conditional circuits and electronic equipment. It's used to accomplish beam measure of fifteen static targets that are placed in all inject and extract components; Driving control and beam measure of three radial movable probes and one extraction movable probe. To improve the property of the Beam Diagnostic System, much had been done to promote the compatibility and operating speed of the system. And a new software with Menu interface under Windows 95 had been also developed. To satisfy some special operating requirement of the system, we discussed some improving expecting with special attention In the condition that the property of I/V converter been improved, we plan to develop new software that may improve the accuracy of measurement and driving speed of the developing. Make our software system network support. Developing a Driver Controller of the movable probes with intelligence control is in expecting.

Submitted by: Fang Liming Zhang Guixu Chu Zhengsheng
Full address: IMP, the Chinese Academy of Science, LANZHOU,730000
Key words: HIRFL SSC Beam Diagnostic Central Region

ID197: Accelerator Control System and VME Front End Computer

Leng Yongbin Wang Guicheng Pei Yuanji

NSRL,University of Science and Technology of China,Hefei 230029

Control system architecture development has followed the advances in computer technology through mainframes to minicomputers to micros and workstations. This technology advance and increasingly challenging accelerator data acquisition and automation requirements have driven control system architecture development. The distributed processing system has been widely adopted in the world. The new control system of NSRL should be a reliable, stable, extensible and full distributed system.It must capable of. (1) operating all the facilities as machines which have separate missions and controlling devices in the central control room; (2) controlling and monitoring allequipments of the accelerator; (3) providing the tools analyzing the running status of the machine and the tools calculating the machine's parameters; (4) warning and protecting the equipments when accidents happen or equipments fault, protecting the people from radiation. The control system is based on a "Standard Model" architecture of the full distributed processing system. Logically the system is composed of four levels from top to bottom, which are: the console layer, the manager layer, the 1/0 controller layer, and the device controller layer. At the first some realtime subsystems should be built based on EPICS; and other subsystems which only monitor the machine's running status should be built based on PC systems which communicate with other subsystems through LAN . The upper three layers are linked by a LAN(ethemet); the 1/0 controller layer and the device controller layer are linked by a field bus(CAN bus). Experimental Physics and Industrial Control System was adopted as the system software. EPICS provides a wide range of functionality, rapid application development and modification, and extensibility at all levels to meet the demands of experimental physics. Technology changes will ftu-ther extend the performance of the EPICS subsystems. Its architecture is divided into three layers, which are: the operator interface layer, the network layer and the 1/0 controller layer. The main magnet power supply control subsystem is the most important part of the new accelerator control system of NSRL. After injection the beam energy in the ring is ramped up to the operating energy, which is called ramping operation. In this operation the magnet currents have to track each other in order to keep the ring lattice unchanged. The main function of the M.M.P.S. control system is to assure the synchronization and accuracy of the magnet currents in the ramping operation. This subsystem should be built as an experimental control line preferentially. The other subsystems can be configured on this model. All of the realtime tasks will run on the front end computers which have the capacity of parralled processing. The VME based computers with vxworks realtime operating system are selected as front-end computers. The 1/0 controller layer of the EPICS should be loaded and debugged in them. All the control and data acquisition transactions with the machine's equipment take place here. The raw data from the devices are stored in the local database of FECS. Only necessary data of the high layer will be sent out. The ramping program will be written in "C" language and runs on the M.M.P.S. FEC.This program generates the waveforms of the magnet currents in the ramping operation.

Submitted by: Leng Yongbin Wang Guicheng Pei Yuanji
Full address: NSRL,University of Science and Technology of China,Hefei 230029
Key Words EPICS,field bus,ramping,realtime operating system

ID198: An approach of stabilizing control based on state observer for uncertain linear systems with time delay

He xiongxioiig Wang shuqing Wang jicheng

National Key Lab. of industrial Control Tech.,Zhejiang University,Hangzhou,310027,P.R.China

In recent years the stabilizing problem of an uncertain system has received great attention. Numerous researchers have used state feedback stabilizing control to achieve this task. However in practice, the states of the system may not be available. Luenberger first proposed the concept of the ' observer ' and introduce the idea of a ' state observer ' to estimate those states which are inaccessible for direct measurement. The paper introduces a Riecati equation approach to synthesis of the full state observer and state feedback law for uncertain linear systems with time delay. In this approach, if two given algebric Riccati equations are solved, their solutions can be applied to systhesis the stabilising state feedback and state observer gain matrices. the uncertainties considered in the systems may be time-varying. However , the values of those uncertainties are constrained to lie within some known admissable bounds. Furthemore, the so-called matching conditions are not needed in the paper.

ID199: A New Timing System for HESYRL

Pengjie Zhang, Qi An, Yanfang Wang

Fast Electronics Lab, Modern Physics Dept.,USTC MailBox 4, Hefei, AnHui, 230027 , P.R.China

The HESYRL synchrotron radiation facility has two main conponents: 800MeV electron storage ring and the 200MeV linear accelerator. Timing system is an important part of the HESYRL control system. Its main function is to provide synchronization trigger signals for the LINAC ( which includes the Electron-Gun¡¢the Microwave excitor and six Modulators), the Switch magnet, the Septum, the Kicker and beam diagnosis system. The former Timing system only allow injection in full bunches mode, the new Timing system provide more precision and more stabe trigger signals, it will allow injection in both full bunches mode and single bunch mode. The new timing system is devided into fast and slow timing systems. The fast timing system provides trigger signals for Electron-Gun and the Kicker£¬the jitter of these trigger signals is less than 100ps with respect to the storage ring RF, and their delays can be programmed with a step of 100ps. The slow timing system provide trigger signals for other devices¡£The timing delay of each trigger signal can be programmed in the range of its period.

Submitted by: Pengjie Zhang
Full address: Fast Electronics Lab, Modern Physics Dept., P.O.Box 4, Hefei, Anhui 230027, P.R.China
Fax number: +86-551-3601164
Keywords: Timing, Jitter, Single bunch injection.