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基于康普顿散射的 X 射线源

基于康普顿散射的 X 射线源. Wang Xu & SLEGS Collaboration. Outline. Part 1. Introduction of SLEGS prototype facility Part 2. Experimental datum analysis Part 3. Results and next step to do. Compton Scattering. Inverse Compton scattering. b : Electron velocity /c

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基于康普顿散射的 X 射线源

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  1. 基于康普顿散射的X射线源 Wang Xu & SLEGS Collaboration

  2. Outline • Part 1. Introduction of SLEGS prototype facility • Part 2. Experimental datum analysis • Part 3. Results and next step to do SLEGS样机一期实验介绍 及下一步工作开展

  3. Compton Scattering Inverse Compton scattering b : Electron velocity /c qL: Incident angle of laser photon q : Scattered angle of photon Scattered electrons Head-on collision (qL=0) Incident Photons El q Incident electrons Ee Scattered photons Eg ex. Ee=100MeV, l=1.064mm Eg～180keV Bang! SLEGS样机一期实验介绍 及下一步工作开展

  4. SLEGS Prototype SLEGS样机一期实验介绍 及下一步工作开展

  5. SLEGS样机一期实验介绍 及下一步工作开展

  6. SLEGS样机一期实验介绍 及下一步工作开展

  7. Si (Li) detector • Table1. Basic parameters of Si (Li) detector • Fig. Si (Li) detector efficiency as a function of x-ray energy from less than 1keV to 100keV. SLEGS样机一期实验介绍 及下一步工作开展

  8. Electronics diagram ADC1 X-ray detector Amp 671 TFA 474 HV 6 5 9 CF DIFF Disc 583 LINAC signal GG8010 TTL ADC2 TTL-NIM 89 TAC 567 Linear Gate 542 NIM GG8010 GG8010 Trigger CO 4020 SLEGS样机一期实验介绍 及下一步工作开展

  9. Data acquisition chip NI PCI-6132 Data Acquisition system (DAQ) Single or multiplier measure Time or Event Time gap Rates; Counts; Passed time; Trigger input • Data acquisition Interface NI BNC-2110 SLEGS样机一期实验介绍 及下一步工作开展

  10. Energy calibration FWHM=190.0keV • Fig.4-b. X-ray spectrum of radionuclide 238Pu. • Fig.4-a. X-ray spectrum of radionuclide 55Fe • Fig.4-c. X-ray spectrum of radionuclide 241Am SLEGS样机一期实验介绍 及下一步工作开展

  11. Energy calibration result • Fig. 4. Energy calibration of data detection system; It’s uncertainly is E-4. So no error bars was saw here. • Then, First-order function ofenergy calibration as follows: • Voltage [V] = P0+P1* Energy [keV]; • P0 = -0.0014 ±0.0023；P1 = 0.1021 ±0.0002； SLEGS样机一期实验介绍 及下一步工作开展

  12. Time calibration • Fig.6. Time calibration of Si (Li) detector. TAC range: 500ns (square), 800ns (circular), 2μs (triangle),4μs (diamond), and 8μs (pentagram), respectively. SLEGS样机一期实验介绍 及下一步工作开展

  13. Dead time of electronics and DAQ system • Fig. DAQ acquire-efficiency as a function of counts s-1 increasing. The acquire efficiency about 100% when it’s counts s-1 less than or equal to 20Hz. The Laser Compton Scattering (LCS) experiment worked under the repetition of 5Hz, so it can meet experimental requirement. • Efficiency [%] Counter= Counts s-170sample/Counts s-1Counter*100% • Efficiency [%] continue scan = Counts s-170 sample /Counts s-1106sample*100%. SLEGS样机一期实验介绍 及下一步工作开展

  14. Synchronous Control Both of the laser system and DAQ were synchronized to the RF of the electron beam. SLEGS样机一期实验介绍 及下一步工作开展

  15. Compton Chamber Laser e-Beam SLEGS样机一期实验介绍 及下一步工作开展

  16. ND:YAG Laser SLEGS样机一期实验介绍 及下一步工作开展

  17. 实验数据分析-激光和电子时间同步分析 Fig.3 Schematic diagram of the synchronization between laser pulse and electron bunch SLEGS样机一期实验介绍 及下一步工作开展

  18. Table.2 SLEGS样机一期实验介绍 及下一步工作开展

  19. 激光和电子的延迟 SLEGS样机一期实验介绍 及下一步工作开展

  20. Bremsstrahlung background • Experiment setup：Position of detector:(-30,70mm); Electron beam: 0.1nC;Distance between detector and target: 5m; SLEGS样机一期实验介绍 及下一步工作开展

  21. Electron:0.1nC,108MeV;Laser:1.064um; 10MW;Distance between detector and target is 10m; SLEGS样机一期实验介绍 及下一步工作开展

  22. SLEGS样机一期实验介绍 及下一步工作开展

  23. 数据文件及其效率 附注：h4+h2-h3-h1表示有激光和电子 － 无激光仅有电子。 SLEGS样机一期实验介绍 及下一步工作开展

  24. 实验所测得的能谱及其拟合的结果 SLEGS样机一期实验介绍 及下一步工作开展

  25. 出射能量（eV）随入射角 和散射角 的变化关系 散射光子的能量随激光入射角的关系 24.8keV • 上图表示，当散射角为0时，散射光子的能量随激光入射角的变化关系。这里电子能量取108MeV;在激光入射角为400时，散射光子能量为24.8keV. SLEGS样机一期实验介绍 及下一步工作开展

  26. X-射线的产额的估计 探测器的计数率=Y×2×探测器的立体角×效率×穿透率 SLEGS样机一期实验介绍 及下一步工作开展

  27. 实验结果小结 • 实验结果表明，我们已经发现了预期的X-射线峰，能量位于29 ± 6keV，考虑激光和电子以40发生康普顿散射的，实验值和理论预言值（24.8keV）是一致的；X-射线的计数为81±32, 相应计数率为0.005±0.002 /pulse。这与理论估计值0.0023/pulse是一致的。 • 如果把直线加速器的流强提高到正常值（0.1nC/脉冲1.2nC/脉冲），在10Hz的脉冲频率下运行，激光器的性能也得以提高（峰值功率从10MW200MW），那么，根据我们所测得的计数率，X-射线源的强度可以达到3000Hz。 SLEGS样机一期实验介绍 及下一步工作开展

  28. Next step to do Table：国内外同类型的装置上所使用的激光器的性能 [1] K. Kawase et al. Review of Scientific Instruments 79, 053302 (2008)； [2] K. Chouffani et al. Nucl Instr Meth A 495 (2002) 95–106; [3] 杜应超,雌程诚,黄文会,等,Chinese Physics C32(2008)75-79 SLEGS样机一期实验介绍 及下一步工作开展

  29. LCS experimental parameters SLEGS样机一期实验介绍 及下一步工作开展

  30. SLEGS样机一期实验介绍 及下一步工作开展

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