| 罗文,宋英明*.飞秒康普顿光源驱动的超短、高能正电子束[J].南华大学学报(自然科学版),2012,26(4):7~9.[LUO Wen,SONG Ying-ming*.Generation of Ultra-short and Energetic Positron Beam with a Femtosecond Compton Light Source[J].Journal of University of South China(Science and Technology),2012,26(4):7~9.] |
| 飞秒康普顿光源驱动的超短、高能正电子束 |
| Generation of Ultra-short and Energetic Positron Beam with a Femtosecond Compton Light Source |
| 投稿时间：2012-11-14 |
| DOI： |
| 中文关键词: 正电子束 超短 飞秒康普顿光源 高Z靶 |
| 英文关键词:positron beam ultra-short fs Compton light source high-Z target |
| 基金项目:国家自然科学基金资助项目(11247215);核技术及应用湖南省重点学科基金资助项目 |
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| 中文摘要: |
| 利用飞秒康普顿伽玛光与高Z靶相互作用，产生超短脉冲的高能正电子束.模拟研究表明,10 fs、4.2×108/s、最高能量为23 MeV的康普顿伽玛束和厘米级的铅靶相互作用（对产生）时，可以获得通量为4.2×107/s、峰值能量约为7 MeV的超短脉冲（≤100 fs）正电子束.此短脉冲、高能正电子束在精确探测或诊断材料内部的微观结构、电子动量分布及缺陷状态，以及研究材料和生物体结构的超快动力学等领域有重要的应用前景. |
| 英文摘要: |
| A scheme for generation of ultra-short and high-energy positron beam by impinging fs Compton gamma-ray beam on high-Z target is proposed.Our simulation shows that for 10 fs,≤23 MeV Compton gamma-ray beam interacting with centimeter-class lead target,about 4×107 positrons/s in the form of sub-100 fs pulses at several MeV can be produced.Such ultra-short and energetic positron beam has some potential for precise detection and diagnostics of microscopic structure,electron momentum distribution and defect state of condensed material,as well as investigating ultrafast dynamics in material and biological structures. |
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