Determination of beam emittance using SEM multiwire devices

Yunlong Qian; B. Laune; G. Derrig

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Determination of beam emittance using SEM multiwire devices

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- Determination of beam emittance using SEM multiwire devices
- Nuclear Techniques Vol. 10, Issue 6, (1987)
- 作者机构：
  
  1.中国科学院上海原子核研究所
  2.Cyclotron Institute, TAMU
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：17 July 1986，
  
  Published：1987-06
- 稿件说明：
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Yunlong Qian, B. Laune, G. Derrig. Determination of beam emittance using SEM multiwire devices[J]. Nuclear techniques, 1987, 10(6): 18-22,60,61.
DOI：

Yunlong Qian, B. Laune, G. Derrig. Determination of beam emittance using SEM multiwire devices[J]. Nuclear techniques, 1987, 10(6): 18-22,60,61. DOI：

摘要

在束流输运系统中，快速而精确地测定束流的发射度，对于提高束流传输效率、调节并保证束流达到预期的场所，是十分重要的。通常在测定束流发射度时采用移动缝隙法

[1]

或电磁偏转方法

[2]

。这些方法不仅需要附加一些较复杂的装置，而且测量时费时费力。特别是这些方法都必须采用缝隙装置，在测量时截留了大部分束流流强，因而必须强迫冷却，而在测量后，这些缝隙装置又带有很强的放射性。除了以上这些问题以外，由于束流在缝隙上的散射，又使测量结果的误差增大。Fermi实验室的E. R. Gray

[3]

、CERN的G. Baribaud和C. Metzger

[4]

曾用测量束流剖面的方法来测定束流的发射度。他们测量一段漂移空间内三点的束流剖面，然后再定出束流的发射度。在测量中发现，为了使束流发射度测量的相对误差能降至最小值，必须使三点中的一个测定点，通常是中间的测定点位于束流的成腰处。以后GANiL的R. Anne等人

[5]

采用另一种间接测量法，在四极透镜后，放置一台束流剖面测量仪。改变四极透镜的磁场，并测量相应的束流剖面。原则上只要反复测量三次，获得三组四极透镜磁场和相应的束流剖面值以后，就能定出束流在四极透镜入口处的发射度。测量的相对误差将随测量次数的增加而迅速下降。Anne等测量了20次束流剖面宽度，并用均方根值来计算束流发射度。

Abstract

The three gradient method for determination of beam emittance was described. The SEM multiwire devices set behind quadrupole or a pair of quadrupole magnets have been applied to measure the beam emittance. For obtaining better results the measured data were disposed mathematically with least square method. A computer program was written to obtain and display the beam emittance

related parameters as well as the beam ellipse. The beam emittance in both horizontal and vertical plane can be determined at same time by this method. The factors affecting the precision of measured results were discussed briefly in the paper.

关键词

Keywords

references

K. Ishii et al. , Nuclear Instr. Meth. , 185 ., 1 ( 1981 ).

P. Strehl et al. , IEEE Tran. Nucl. Sci. , NS-28 , 3 , 2216 ( 1981 ).

E. R. Gray , ibid , NS-18 , 3 , 941 ( 1971 ).

G. Baribaud and C. Metzger , ibid , NS-20 , 3 , 659 ( 1973 ).

R. Anne and M. Van den Bossche , ibid , NS-26 , 2 , 2379 ( 1979 ).

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