兰州重离子加速器数字脉冲电源同步功能的实现

介绍了同步加速器脉冲电源的同步性能对提高加速器性能的重要性,提出了一种基于FPGA的、适用于全数字脉冲电源的可编程片上系统实现方案,该方案以光纤及连接器为信号载体、以同步光纤组件模块为核心部件。测试结果表明,该方案满足数字脉冲电源的功能性要求,且达到设计指标。     

Harp, A Short Pulse, High Current Electron Beam Accelerator

A 3 MV, 800 kA, 24 ns electron beam accelerator is described and the results of initial switching experiments are discussed. The generator will provide a source for studying the physics of processes leading to electron beam driven, inertially confined fusion. The major components of the accelerator are two diodes with a common anode, twelve oildielectric Blumleins with low jitter (< 2 ns) multichannel switches, three intermediate storage capacitors, a trigger pulse generator and two Marx generators.     

高压倍加器微秒脉冲束系统的建立

为满足某些效应本底较低的实验的需求,在中国原子能科学研究院的高压倍加器上利用束流切割的方法建立了一套微秒脉冲束系统,并对研制的系统进行性能测试,介绍了该系统的建造方法和性能测试结果。该套装置符合设计要求,可投入实际应用。     

A Simulation Model for the FX-75 Relativistic Electron Beam Accelerator

A one-dimensional, time-dependent coaxial transmission line model is presented for analysis of the voltage, v(z,t), and current, i(z,t), response to an electron beam load for the FX-75 accelerator. The model consists of finite segments of coaxial transmission lines separated by lumped equivalent circuits representing the various abrupt discontinuity points. Each line segment is divided into two one-dimensional grids with a 0.1 nanosecond transit time grid separation for the backward and forward TEM waves. Results from program FXPULSE utilizing a thirty-eight line-load representation of the FX-75 accelerator for a time-invariant, high-impedance diode load show close agreement.     

Accelerator mass spectrometry: A versatile tool for research

A review of measurements with accelerator mass spectrometry is presented. Emphasis is placed on the use of long-lived radioisotopes and the versatility of the method. Although necessarily incomplete, this paper is intended to convey some feeling for the enormous breadth of AMS measurements and its prospects for future research.     

加速器屏蔽室入口安全系统的设计

为进一步确保辐照过程中人员的人身安全,对辐照加速器小车系统迷宫入口设计一种光电联锁系统。该光电联锁系统根据小车具体结构采用28组光电开关多点分布组合设计,设置于辐照加速器屏蔽室入口处,具有检测到非特定特征小车或物体进入屏蔽室时发出报警信号的功能。为辐射、化学危害,核能利用等提供有力的安全保障和技术支持,对设备的操作便捷性、场地安全性有重要指导意义。     

A Comparison of Triodes and Klystrons for Particle Accelerator Applications

In the frequency range between 200 and 1200 mcs, it is possible to use either klystrons or triodes for particle accelerator applications. This paper analyzes the bases of choice between these tube types from a systems point of view. It treats development status, initial and operating costs, reliability, system complexity, and all pertinent technical factors. The tentative specifications of the proton linear accelerator r-f system proposed by Los Alamos are used as a basis for comparison, and the conclusions reached on this system are extrapolated to higher and lower frequencies. It is concluded that either triodes or klystrons can be used in most, if not all, applications and that in almost every significant respect, in the frequency range considered, the klystron system is superior to the triode system.     

Instrumentation and Controls for the Stanford Linear Accelerator

We discuss the philosophy of an accelerator instrumentation system, and techniques which have been worked out for handling the various remote sensory and control functions required for proper operation of the accelerator. Lack of time prohibits more than incidental reference to philosophy of operation of the machine.     

产生伪随机时变脉冲的一种方法

本文介绍一种伪随机脉冲发生器,其时变脉冲的计数率按e~+ ~l变化,λ=0.4或0.7,同时也给出时不变脉冲输出。     

窄脉冲信号峰值保持器

介绍一种窄脉冲信号峰值保持器,采用跨导型放大器,可对窄脉宽(10ns～250ns)、重频(单脉冲到kHz)的脉冲信号进行峰值检测.通过spice模型仿真和实际电路测量,表明该电路具有动态范围大、非线性小等特点.     

Design of Shield for Non-destructive Testing Accelerator

正The electron linear accelerator used in the non-destructive testing accelerator mainly produces ionizing radiation, and the protection against X-ray is the key point.Based on the different kinds of rays,the effect of the shielding     

用于加速器质谱测量的Bragg探测器

文章涉及1台用于加速器质谱(AMS)测量的Bragg探测器的建立及其调试结果。该探测器是1台全阻止型的气体电离室,电场方向与入射粒子方向平行。用241Am源的α粒子对该探测器的主要性能进行了测试,并将该探测器用于AMS实验进行总能量测量和Z的鉴别。对于能量为49.7 MeV的26Mg离子,能量分辨达到1.4%,Bragg峰值的分辨好于4.1%。     

Design of Coupling Loop for Ridgetron Accelerator

正The electron radiation accelerator with the features of low cost and non-polluting is one of the basic equipments in the field of radiation processing.The ridgetron accelerator,whose beam power can be up to 50kW and more,is a device which can meet the future need of large quantities of radiation processing.The input coupling loop with the ability to send nearly 100kW of microwave power into the accelerating cavity is a key     

一种用于高能物理实验的时钟相位精确同步方法

现代高能物理实验中,对时钟系统有着精度和稳定性的要求。高速串行通信技术,因其能够在进行数据传输的同时进行时钟数据恢复而得到广泛应用。针对因此带来的恢复时钟相位不确定性,设计了一种基于串并转换技术和FPGA的时钟同步方法,能够为高能物理实验多节点时钟系统提供精确相位同步的时钟。该方法利用FPGA内部硬件资源对恢复时钟进行处理,串并转换芯片自带的状态位和优秀的串并转换能力极大地简化了系统设计,并增强了系统性能。     

用于静电加速器的计算机控制系统

为提高静电加速器控制系统的智能化水平，采用PLC以及红外和光纤传输技术，将网络通信融入其中，研制出一套静电加速器自动化控制系统。在阐述该系统结构的基础上，分析了干扰源的类型，对控制系统进行了抗干扰设计。在硬件方面，分别采取限制电晕针位置、使用浪涌电流吸收器、屏蔽、接地以及稳压措施；在软件设计方面，采取互锁保护、软限位、延时器以及诊断保护程序。这样，有效地提高了控制系统的电磁兼容性。目前，该系统工作稳定，除偶尔丢失信号外，未见其它故障发生。     

A Zero-Crossing Pulse Shape Discriminator for Space Applications

A circuit for discriminating neutrons, gammas and charged particles from each other in a phoswich scintillator is described. The scintillator is intended for use as a fast neutron detector. Test results indicate that the particle discrimination capability, noise rejection, and pulse pile up rejection are good. The circuit is capable of operating with very little degradation over a wide temperature range. Energy information for neutrons and gammas is also simultaneously obtained. The dynamic range is at least 20:1. The circuit has the capability of accepting count rates up to 4 × 105 per second without loss of information.     

Accelerator mass spectrometry

The general principles of accelerator mass spectrometry, together with recent progress in the subject, are discussed.