Development and application of the intense slow positron beam at IHEP

WANG Bao-Yi; MA Yan-Yun; WANG Ping; CAO Xing-Zhong; QIN Xiu-Bo; ZHANG Zhe; YU Run-Sheng; WEI Long

doi:10.1088/1674-1137/32/2/016

Chinese Physics C> 2008, Vol. 32> Issue(2) : 156-159 DOI: 10.1088/1674-1137/32/2/016

Development and application of the intense slow positron beam at IHEP

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Abstract：
This paper describes the development and application of an intense slow positron beam at IHEP with regard to its two main components. The Variable-Energy Positron Lifetime Spectroscopy (VEPLS) based on the pulsing system consisting of a chopper, a prebuncher and a buncher has been constructed in order to meet the needs of materials science development. At present, the time resolution of the VEPLS can easily reach about 386ps with a peak-to-background ratio of about 600:1. A plugged-in ²²Na positron source section for adjusting the newly built experimental station and for increasing the beam operation efficiency has been constructed. A slow positron beam with an intensity of 2.5×10⁵e⁺/s and the beam profile whose diameter is 10mm has been obtained; the moderation efficiency of the tungsten mesh moderator reaches 5.1×10^－4 as calculated with an original positron source activity of 52mCi.

References

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WANG Bao-Yi, MA Yan-Yun, WANG Ping, CAO Xing-Zhong, QIN Xiu-Bo, ZHANG Zhe, YU Run-Sheng and WEI Long. Development and application of the intense slow positron beam at IHEP[J]. Chinese Physics C, 2008, 32(2): 156-159. doi: 10.1088/1674-1137/32/2/016

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Received: 2007-03-23
Revised: 2007-05-09

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沈阳化工大学材料科学与工程学院沈阳 110142

Development and application of the intense slow positron beam at IHEP

Corresponding author: WANG Bao-Yi,

Received Date: 2007-03-23
Accepted Date: 2007-05-09
Available Online: 2008-02-05

Abstract: This paper describes the development and application of an intense slow positron beam at IHEP with regard to its two main components. The Variable-Energy Positron Lifetime Spectroscopy (VEPLS) based on the pulsing system consisting of a chopper, a prebuncher and a buncher has been constructed in order to meet the needs of materials science development. At present, the time resolution of the VEPLS can easily reach about 386ps with a peak-to-background ratio of about 600:1. A plugged-in ²²Na positron source section for adjusting the newly built experimental station and for increasing the beam operation efficiency has been constructed. A slow positron beam with an intensity of 2.5×10⁵e⁺/s and the beam profile whose diameter is 10mm has been obtained; the moderation efficiency of the tungsten mesh moderator reaches 5.1×10^－4 as calculated with an original positron source activity of 52mCi.