题目（Title）： The design and implementation of the positron spectroscopy laboratory at ELI-NP
主持人(Chairperson): 王宝义 研究员 （Prof. Baoyi Wang）
时间(Date): 2018年1月19日 9:30—11:30
地点（Place）：高能所 主楼 C209 （Main Building C209）
In the presentation I will give a report on the plans to build a positron spectroscopy laboratory at the Extreme Light Infrastructure-Nuclear Physics (ELI-NP). The slow e+ source is based on e？？e+ pair production in a converter made of tungsten foils by a brilliant gamma beam (Eγ<3.5 MeV, Iγ = 2.4×1010 γs-1) which will be generated by Compton back？scattering of photons from a high power laser on electrons from a LINAC. Numerical simulations of γ–ray interactions with the designed converter showed that, if the tungsten foils are used for moderation of the created fast e+, a slow e+ beam of an intensity of ~1×106 s-1 can be obtained. The planned positron spectroscopy techniques to be used at the positron laboratory at ELI-NP are: Positron Annihilation Lifetime Spectroscopy (PALS), Coincidence Doppler Broadening Spectroscopy (CDBS), Age MOmentum Correlation spectroscopy (AMOC), and Positron annihilation initiated Auger Electron Spectroscopy (PAES). In the presentation I will also give details on the design and simulation of the pulsing system and on the design and simulation of the bent tube energy filter that will be used for minimizing the effect of backscattered positrons in PALS measurements.