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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

  • 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.
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    [1] . Shultz J, Lynn K G. Rev. Mod. Phys., 1988, 60: 7012. WANG B Y, CAO X Z, WEI L et al. Mater. Sci. Forum.,2004, 445-446: 5133. YU R S, WANG B Y et al. HEP NP, 2001, 25: 135 (in Chinese)4. WANG P, MA Y Y, QIN X B et al. A Kind of Cosine Coils. Chinese Patent. (Have Passed the Application, Application Number: 200620139023.1)5. MA Y Y, PEI S L et al. HEP NP, 2006, 30: 166 (in Chinese)6. Willutzki P, Stormer J, Kogel G et al. Mater. Sci. Forum.,1995, 175-178: 2377. MA Y Y, WANG P, ZHANG Z M et al. A New Kind of Multi-Layer Structure Device for Intense Magnetic Shielding in PMT. Chinese Patent. (Have Passed the Application, Application Number: 200610113824.5)

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

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