共查询到19条相似文献,搜索用时 593 毫秒
1.
2.
丝靶探测器是一种可以精确测量束流截面尺寸的装置。近年来,BEPCII在注入器末端安装了一组丝靶探测器,用来测量直线加速器出口的束流发射度,改进优化了束流截面和发射度测量计算的方法,提高了数据处理速度。同时,根据BEPCII丝靶测量流程,开发了发射度测量计算软件,实现了束流尺寸和发射度的实时在线测量,进一步提高了发射度的测量速度,为BEPCII的注入优化提供了参考。 相似文献
3.
4.
基于图像获取技术的发射度测量方法研究 总被引:2,自引:0,他引:2
介绍了HIRFL上利用荧光靶图像获取装置构成多孔屏束流发射度测量系统,对测量数据的处理、光斑面积、周长和束流发射度的计算方法做了重点介绍,该系统具有可靠性好、测量直观、界面友好等优点。 相似文献
5.
用三梯度法测量束流发射度的研究 总被引:1,自引:0,他引:1
准确测量发射度对加速器束流的调制和性能的评估极端重要,本文介绍在HIRFL(兰州重离子加速器)现有设备基础上,利用三梯度法测量束流发射度的系统,讨论了测量原理和方法,以及测量中要注意的问题.并对数据的计算处理做了详述。专门设计了一套软件系统,以实现束流发射度、束流剖面等束流参数的实时测量。该系统具有可靠性好、测量直观、测量较准确等优点。 相似文献
6.
7.
8.
9.
一、引言加速器束流发射度是束流本身的一个重要特性参量,它完整地描述了束流的径向性能。发射度的测量,为加速器输出束流的使用提供了确切的依据,特别是对于束流的传输来说,有效发射度及其σ矩阵是计算传输过程中束流包络所必不可少的初始条件。 相似文献
10.
强流RFQ加速器要求严格控制束流损失和束流发射度增长,因此必须准确测量和正确分析RFQ加速器的场分布和模式的场分量,并使它们符合设计要求。LebView是一个广泛应用于自动测量和数据处理的计算机软件平台,介绍了在此平台上开发的RFQ自动测量软件和数据分析软件,同时给出这些软件的一些应用实例。 相似文献
11.
上海光源二期工程正在设计一个新的磁聚焦结构,它包含双斜插入件、超导二极铁以及超导扭摆器等新的元件。光谱亮度是表征同步辐射光源性能的一个重要参数,通过降低垂直发射度的方式来提高亮度是一种简便可行的方法。首先分别模拟和计算了各类磁铁准直误差对垂直发射度的影响,然后采用奇值分解法校正了误差引起的闭轨畸变,最后使用60个斜四极铁来校正垂直发射度。结果表明,在上海光源二期工程的磁铁准直公差与目前正在运行的上海光源相同的条件下,六极铁垂直准直误差对垂直发射度的影响最大;用60个斜四极铁来校正垂直发射度,能使耦合度保持在0.5%以下。 相似文献
12.
13.
《核技术(英文版)》2019,30(12)
The transverse emittance of the extracted beam from the heavy ion medical machine cyclotron is measured and then optimized for injection into the synchrotron.For the purposes of cross-validation,three methods,i.e.,slitgrid,Q-scan,and 3-grid,are used to measure the emittance.In the slit-grid technique,an automatic selection of the region of interest is adopted to isolate the major noise from the beam phase space,which is an improvement over the traditional technique.After iterating over the contour level,an unbiased measurement of the emittance can be obtained.An improvement in the thin lens technique is implemented in the Q-scan method.The results of these measurements are presented. 相似文献
14.
推导了静电引出通道的等效简阶振荡方程(轴向),给出了引出系统的一阶传输矩阵:分析了引出束初始发射度椭圆矩阵的确定方法;给出了束发射度计算结果,并与国外同类型加速器的实测作了比较。 相似文献
15.
16.
17.
分析了初始无关联无耦合的束流通过存在横向和纵向耦合的束流系统后发射度的增长。结果表明,束流的有效发射度随着束流初始条件的变化明显地增长。给出了束流有效发射度的增长关系和边界方程式。 相似文献
18.
T. T. Inamura M. Koizumi K. Morita
A. Yoshida
M. Takami
T. Ishizuka
I. Nakamura M. NakaokaT. Murayama
I. Sugai
M. Azuma
H. KatsuragawaK. Shimomura
S. Matsuki
A. Iivonen
K. Valli 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1992,70(1-4):226-232The velocity distribution of an ion beam from an IGISOL ion guide isotope separator on-line was measured directly by means of laser spectroscopy and compared with that estimated from the mass spectrum. The latter is found to be more than two times broader than the former. The emittance of the ion beam as well as its velocity spread was also studied with laser beams. It is noted that the emittance affects the mass spectrum considerably, resulting in a poor resolving power for the net velocity spread. Laser spectroscopy of radioactive atoms with the IGISOL, especially of refractory elements, seems promising. 相似文献
19.
A new beam-based alignment (BBA) measurement system with AC k-modulation module was developed recently at Hefei Light Source (HLS), which equipped the quadrupole magnets on the storage ring with a current shunt system which was able to vary the magnet current of a given quadrupole at a given frequency. The corresponding closed orbit oscillation amplitude measured for different beam positions in the quadrupole reached a minimum when the beam was centered in the quadrupole. Amplitude estimation algorithms of software lock-in amplifier and interpolated FFT were discussed. A V-shaped curve was used to determine the offset; a method using a parabola fit to determine the offset was also discussed. This BPM-to-quadrupole offset was determined at HLS with an accuracy of ~50 mum. The reproducibility of the beam based alignment using this technique is about 20 mum (RMS) 相似文献