初中物理演示实验有效教学探讨

物理是一门以实验为基础的科学,它把深刻的科学道理蕴藏在各种丰富多彩妙趣横生的物理实验和物理现象中.初中物理实验教学的形式主要有演示实验、学生实验和课外实验等.所有实验中,演示实验所占的比重最大.     

基于Windows的工科物理实验教学系统

本文主要介绍了工科物理实验计算机辅助教学系统.该系统以热学实验为基础,利用计算机数据采集技术,建立了一套完整的实验演示与操作系统.系统软件为标准的Windows应用程序,使用方便.     

《物理实验》杂志稿约

《物理实验》杂志是由教育部主管、东北师范大学主办的学术期刊.本刊宗旨主要是交流物理实验研究成果,介绍国内外物理实验方面的新发展.它适合于大学和中学的物理教师、理工科学生、物理实验工作者以及教学仪器研制技术人员阅读.1稿件内容1)物理实验前沿领域介绍.     

北京同步辐射XAFS实验方法新进展

近年来基于现有的XAFS站线条件,与用户互相配合在发展实验方法,开拓XAFS的应用方面做了一些新的尝试.主要包括高温熔态XAFS实验、全反射XAFS方法、及发光XAFS实验方法.文中分别介绍了以上几种实验方法的意义,实验设置及实验结果,并进行了讨论.     

《物理实验》杂志稿约

《物理实验》杂志是由教育部主管、东北师范大学主办的学术期刊.本刊宗旨主要是交流物理实验研究成果,介绍国内外物理实验方面的新发展.它适合于大学和中学的物理教师、理工科学生、物理实验工作者以及教学仪器研制技术人员阅读.     

从两道实验题谈减少实验系统误差的三种操作

以往实验题的误差分析与减少措施主要集中在实验的偶然误差方面;近几年来逐步向系统误差方面转移.下面结合两道实验题来谈谈减少实验系统误差的三种操作,这是目前的新动向,以供参考.     

学生主导型物理实验

<正>1主要内容1.1课程模式每个学生先完成3~4个综合实验,以保证基本的实验训练,同时对指导教师、实验仪器有基本的了解.此后,在做好基本实验的基础上,提出研究性实验课题.在教师的指导下或者自己独立完成实验课题,期终提交1篇研究性实验论文.实验论文课题的选题主要来自于基本实验的改进与延伸,也可以利用原有仪器进行组合或改装,实现自己的一些设想,重在实验研究的过程以及分     

浅谈大学物理设计性实验中信息技术的应用

大学物理课程实验是培养学生实验能力、科学研究思维的重要课程.因此研究和分析如何改善我国大学物理实验教学水平,就显得尤为重要了.本文主要从设计性物理实验对于大学生教学的主要意义和必要性入手,阐述了如何运用信息技术手段,不断的开展和完善大学物理设计性实验教学工作,以期为大学物理实验教学提供新的思路.     

从大学物理实验看中学物理实验教学的改进

主要分析了大学物理实验与中学物理实验在教学上存在的不同,并从大学物理实验的角度对中学物理实验的教学提出了一些改进建议.     

高考物理实验命题引领实验教学

高考物理实验题是近几年一直热门的,把握实验题的考查方向是高考物理得高分的利器.本文主要是从课堂实验教学中所设计的几种实验来阐述课堂实验教学对高考物理实验题的影响.     

Design study of a L-band photocathode RF injector

In the proposal of the Beijing Advanced Light Source, a compact combination of XERL and XFEL using a common SC linac is being considered. In the meantime, an ERL-FEL test facility is being proposed and will be used for THz radiation. In this test facility, a L-band photocathode RF injector is needed. In this paper, we give the physical design of the L-band photocathode RF injector for the test facility.     

大功率RF 离子源阻抗匹配电路的设计与实现

在大功率RF 离子源中,激励器的作用是产生等离子体,阻抗匹配电路是激励器吸收RF 功率的关键。将激励器等效阻抗视为一个电阻和一个电感的串联,采用了一种由一个RF 变压器并和两个可调电容组成的阻抗匹配电路,给出了视RF 变压器为理想变压器时阻抗匹配电路的分析模型,推导了阻抗匹配时两个可调电容的电气参数。当激励器实验装置使用一个石英玻璃激励器时,搭建了一个阻抗匹配电路,成功地将RF 功率耦合进激励器并产生了等离子体。     

Design study of a L-band photocathode RF injector

In the proposal of the Beijing Advanced Light Source, a compact combination of XERL and XFEL using a common SC linac is being considered. In the meantime, an ERL-FEL test facility is being proposed and will be used for THz radiation. In this test facility, a L-band photocathode RF injector is needed. In this paper, we give the physical design of the L-band photocathode RF injector for the test facility.     

飞秒电子束装置的初步实验结果

 上海应用物理研究所建造并调试了一台飞秒电子束装置。这台装置主要由一把S波段热阴极微波电子枪、一台alpha磁铁和一根SLAC型加速管组成。这台装置可以产生能量为 20~30 MeV,峰值电流为100 A,微束团长度为250 fs的电子束。这篇文章报道了这台装置的调试和电子束团参数的测量。     

BXERL photo-injector based on a 217 MHz normal conducting RF gun

The Beijing X-ray Energy Recovery Linac (BXERL) test facility is proposed in Institute of High Physics (IHEP). In this proposal, the main linac requires the injector to provide an electron beam with 5 MeV energy and 10 mA average current. An injector based on DC gun technology is the first candidate electron source for BXERL. However, the field emission in the DC gun cavity makes it much more difficult to increase the high voltage to more than 500 kV. Another technology based on a 217 MHz normal conducting RF gun is proposed as the backup injector for this test facility. We have designed this RF gun with 2D SUPERFISH code and 3D MICROWAVE STUDIO code. In this paper, we present the optimized design of the gun cavity, the gun RF parameters and the set-up of the whole injector system. The detailed beam dynamics have been done and the simulation results show that the injector can generate electron bunches with RMS normalized emittance 1.0 uppi mmcdotmrad, bunch length 0.77 mm, beam energy 5.0 MeV and energy spread 0.60%.     

超快电子衍射装置的束流能量反馈控制

上海交通大学的超快电子衍射(UED)装置由一台电子直线加速器作为驱动,电子枪为一台光阴极微波电子枪。加速器在运行中电子枪会偶尔打火,腔体失谐,造成束流损失,束流能量产生变化,束流需要很长时间才能恢复到初始状态,影响了用户的使用。为此,对低电平控制器(LLRF)的幅度相位控制环路进行了改进,增加了能量反馈,代替了幅度反馈,通过对束流的中心位置进行实时的反馈以控制低电平控制器输出信号的幅度,保证了电子束流的能量稳定和电子枪加速场强的稳定。长时间的稳定性测试表明,电子枪在打火产生时,束流能量可以很快恢复,能量抖动由4.2933×10^-4(RMS)提高到2.8557×10^-4(RMS),实现了束流能量的长期稳定。     

Study on the RF Power Necessary to Ignite Plasma for the ICP Test Facility at HUST

An Radio‐Frequency (RF) Inductively Coupled Plasma (ICP) ion source test facility has been successfully developed at Huazhong University of Science and Technology (HUST). As part of a study on hydrogen plasma, the influence of three main operation parameters on the RF power necessary to ignite plasma was investigated. At 6 Pa, the RF power necessary to ignite plasma influenced little by the filament heating current from 5 A to 9 A. The RF power necessary to ignite plasma increased rapidly with the operation pressure decreasing from 8 Pa to 4 Pa. The RF power necessary to ignite plasma decreased with the number of coil turns from 6 to 10. During the experiments, plasma was produced with the electron density of the order of 10¹⁶m^–3 and the electron temperature of around 4 eV. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Bunch length measurement using a traveling wave RF deflector

RF deflectors can be used for bunch length measurement with high resolution. This paper describes a completed S-band traveling wave RF deflector and the bunch length measurement of the electron beam produced by the photocathode RF gun of the Shanghai DUV-FEL facility. This is the first time that such a transverse RF deflector has been developed and used to measure the bunch length of picosecond order in China. The deflector's VSWR is 1.06, the whole attenuation 0.5 dB, and the bandwidth 4.77 MHz for VSWR less than 1.1. With a laser pulse width of 8.5 ps, beam energy of 4.2 MeV, and bunch charge of 0.64 nC, the bunch lengths for different RF input power into the deflector were measured, and an averaged rms bunch length of 5.25 ps was obtained. A YAG crystal is used as a screen downstream of the deflector, with the calibrated value of 1 pix = 136 μm.     

Superconducting linear accelerator system for NSC

This paper reports the construction of a superconducting linear accelerator as a booster to the 15 UD Pelletron accelerator at Nuclear Science Centre, New Delhi. The LINAC will use superconducting niobium quarter wave resonators as the accelerating element. Construction of the linear accelerator has progressed sufficiently. Details of the entire accelerator system including the cryogenics facility, RF electronics development, facilities for fabricating niobium resonators indigenously, and present status of the project are presented.     

RF gun for an intense THz radiation source

A new facility is under construction at the Shanghai Institute of Applied Physics,to generate femto-second electron bunches and intense coherent THz radiation pulses.A thermionic RF-gun is used to be the electron source of the linac,which is 1.6 cell,π/2,side coupled in design.In the following of this paper,the design,manufacture and beam operation of this gun are presented.