共查询到19条相似文献,搜索用时 156 毫秒
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针对合肥光源高亮度注入器设计了一种四轴对称八条带电极束流能散检测器(BESM),以实现束流能散的非拦截测量。理论推导了从BESM电信号中提取束流横向尺寸分量的公式。通过对BESM的灵敏度、阻抗匹配、电极的时域频域响应等的分析,确定了BESM的电极张角、半径、长度等各方面的物理参数。通过天线法对BESM进行了位置和四极分量的标定,得到了电中心相对于机械中心的偏移、 BESM的位置灵敏度和四极分量灵敏度等参数。通过对多组电信号和位置信号的处理拟合出了机械位置与对数比电位置信号的相关多项式,并给出了四极分量关于束流横向尺寸、束流中心位置以及它们高次项的经验公式。 相似文献
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能散度是反映束流品质的重要参数,采用传统测量方法测量时打到靶上的束流不能得到利用,测得的数据也是多个宏脉冲的平均值,利用该方法的测量结果进行束流调节时,要等待荧光靶从束流轨道中反复插入和提出,调节时间很长。基于单个四条带束流位置检测器,结合发射度测量的方法,实现了非拦截式能散度测量方法。该方法能在不加入额外设备的情况下对每个束流宏脉冲的能散度进行测量,测量结果与传统的拦截式测量方法结果相吻合。进行了误差分析,指出为了减小测量系统误差,需要尽可能使束流通过束流位置检测器中心。 相似文献
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介绍了钮扣电极的应用原理, 并且在原理上与电阻环探测器作了比较, 分析了
这两种探测器各自的优缺点. 根据原理实验的结果, 重新设计了钮扣电极测量
装置. 对原测量盘结构上不合理的地方进行了改进, 并且在新设计中考虑
了“神龙一号”加速器的高真空密封. 在“神龙一号”的强流束实验中, 钮扣电极如实地反映了束流的波形以及束心的偏移量, 其束位置曲线与电阻环曲线
基本吻合, 亦证明了钮扣电极的测量数据是可信的. 在实验中钮扣电极的测量
不确定度达到0.5mm, 满足“神龙一号”强流束实验的测量需要. 相似文献
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对直线感应加速器加速电压的同步性对束流能散度的影响进行了分析,结果表明:考虑束流负载效应后,束流的不同部分将得到不同的能量增益,前后沿部分相对于平顶部分得到更多的能量增益,从而在一定程度上增加整个束流的能散度,限制了加速器光源尺寸的进一步减小。因此,提出利用调节加速电压异步的方法来调节束流不同部分得到的能量增益,从而在一定程度上降低整个束流脉宽期间的能散度。初步的试验结果也证明,加速电压的异步调节可以明显改变束流整体的的能散度。 相似文献
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以AlGaInP-LED外延片为基片,设计了分辨率为320×240、像素尺寸为100 μm×100 μm的微型LED阵列。针对目前LED阵列普遍存在的电流分布不均匀的问题,建立了内部电流分布模型,研究了电极结构、电极尺寸及电极间距等不同因素对LED电流分布造成的影响。在单条形电极结构的基础上进行优化,综合考虑不透明电极的遮光效应等因素得到三条形电极结构为最优的电极结构,该电极结构的LED有源层均匀发光面积比未经优化的单条形电极提高了65.02%,比双条形电极提高25.63%,有效提高了微型LED阵列的出光效率,对改善LED芯片发光均匀性具有参考意义。 相似文献
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介绍了北京大学分离作用射频四极场(RFQ)加速器的结构特点,包括膜片式电极、支撑环式电极支撑系统、水冷系统、调谐系统及其工艺实现;介绍了基于该分离作用RFQ加速腔进行的调谐测试、高功率实验和束流实验。结果表明:调谐系统的频率调节范围及品质因数完全满足实验要求;分离作用RFQ加速腔的输入功率可以达到33 kW以上,满足高功率下稳定运行的条件;在束流实验中,把1.03 MeV的O+入射束流加速到1.65 MeV,半高宽能散小于3%。加速器结构满足物理设计要求,加速系统运行稳定。 相似文献
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《中国物理C(英文版)》2016,(5)
This paper reports the simulation of an electron gun. The effects on the beam quality of some parameters on the beam quality were studied and optimal choices were identified. It gives numerical beam qualities for a common electrostatic triode gun, and the dependencies on design parameters such as electrode geometries and bias voltages to these electrodes are shown. An electron beam of diameter 5 mm with energy of 5 ke V was assumed for the simulation process. Some design parameters were identified as variable parameters in the presence of space charge.These parameters are the inclination angle of emission electrode, the applied voltage to the focusing electrode, the gap width between the emission electrode and the focusing electrode and the diameter of the focusing electrode. The triode extraction system is designed and optimized by using CST software(for Particle Beam Simulations). The physical design of the extraction system is given in this paper. From the simulation results, it is concluded that the inclination angle of the emission electrode is optimized at 22.5?, the applied voltage to the focusing electrode was optimized and found to be Vfoc =-600 V, the optimal separation distance(gap between emission electrode and focusing electrode) is 4 mm, and the optimal diameter of the emission electrode is 14 mm. Initial results for these efforts aimed at emittance improvement are also given. 相似文献
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The possibility of the formation of zero-order Bessel light beams using a uniaxial crystal with cylindrical electrodes is investigated. It is shown that, if a given polarization distribution is provided in the incident beam, a Bessel light beam with the cone angle controlled by an external electric field is formed. It is proposed to use this result for the matching of the axicon parameters and creation of conical lenses with an adjustable cone angle. 相似文献
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F. F. Valiev 《Bulletin of the Russian Academy of Sciences: Physics》2017,81(10):1163-1164
A way of calculating the electromagnetic field generated by a narrow beam of gamma quanta passing through a gas medium is used to describe the field produced by the interaction between water and gamma radiation with an energy of 1 MeV. Variations in the electromagnetic field energy generated by secondary electrons are obtained as a function of the angle of observation. 相似文献
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A new method to detect the magnetic field direction by using a silicon structure is presented in this paper. The structure includes a micro beam and an in-plane coil electrode. When the electrode under a magnetic field is applied with an alternating current, the micro beam is actuated under the effect of the Lorentz forces. Magnetic fields of different directions cause different vibration profiles. The direction of the magnetic field is obtained by measuring the vibration amplitudes of the micro beam, which is driven to work at first- and second-order resonant modes. A micro structure has been fabricated using the bulk micromachined silicon process. A laser Doppler vibrometer system is implemented to measure the vibration amplitudes. The experimental results show that the amplitude of the structure, which depends on the different modes, is a sine or cosine function of the angle of the magnetic field. It agrees well with the simulation result. Currently a resolution of 10° for the magnetic field direction measurement can be obtained using the detecting principle. 相似文献
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针对回旋加速器的束流动力学设计,基于Geant4模拟研究,提供一种可行的数值模拟方法。通过电磁场仿真软件Opera建立相应的电磁场数据导入到Geant4中进行插值计算,利用Geant4自带的电磁场微分方程与微分方程求解器计算粒子的平衡轨道,振荡频率以及加速轨道。其结果表明:对于横向运动而言,Geant4的计算结果与传统数值方法计算结果趋于一致;对于轴向运动而言,由于磁场插值方法的差异性,二者有一定的区别,对于在加速过程中的非平衡粒子,其能量变化围绕平衡粒子振荡。对于束损,通过限制粒子的运动时间,轴向位移加快计算效率,加入电极碰撞的判定使模拟更趋近实际情况。 相似文献