Design of the Magnetic Field System for Beijing Intense Slow Positron Beam Transportation

CAO Xing-Zhong; WANG Bao-Yi; YU Run-Sheng; WEI Cun-Feng; XUE De-Sheng; WEI Long

Chinese Physics C> 2004, Vol. 28> Issue(5) : 560-563

Design of the Magnetic Field System for Beijing Intense Slow Positron Beam Transportation

Key Laboratory for Magnetism and Magnetic Material of Ministry of Education,Lanzhou University, Lanzhou 730000,China2 Key Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
A slow positron beam with intensity of 106e+/s produced by the Beijing Electron-Positron Collider (BEPC) is transported by the 100 Gauss magnetic field system with the oscillation less than 10. In this paper, the distributions of magnetic field at target chamber, sample chamber and Penning-Trap storage are calculated systematically, and the parameters of solenoidal coils and steering coils are calculated respectively. The correction coils are designed to compensate the affect induced by the geomagnetic field and the bent tube. Results of electron beam experiment show that the positron beams are transported to sample chamber with the beam spot size basically unchanged, and the magnetic field distributions satisfy to the requirement of the slow positron beam system.

References

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CAO Xing-Zhong, WANG Bao-Yi, YU Run-Sheng, WEI Cun-Feng, XUE De-Sheng and WEI Long. Design of the Magnetic Field System for Beijing Intense Slow Positron Beam Transportation[J]. Chinese Physics C, 2004, 28(5): 560-563.

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Received: 2003-09-08
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Design of the Magnetic Field System for Beijing Intense Slow Positron Beam Transportation

Corresponding author: WEI Long,

Key Laboratory for Magnetism and Magnetic Material of Ministry of Education,Lanzhou University, Lanzhou 730000,China2 Key Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date: 2003-09-08
Accepted Date: 1900-01-01
Available Online: 2004-05-05

Abstract: A slow positron beam with intensity of 106e+/s produced by the Beijing Electron-Positron Collider (BEPC) is transported by the 100 Gauss magnetic field system with the oscillation less than 10. In this paper, the distributions of magnetic field at target chamber, sample chamber and Penning-Trap storage are calculated systematically, and the parameters of solenoidal coils and steering coils are calculated respectively. The correction coils are designed to compensate the affect induced by the geomagnetic field and the bent tube. Results of electron beam experiment show that the positron beams are transported to sample chamber with the beam spot size basically unchanged, and the magnetic field distributions satisfy to the requirement of the slow positron beam system.