第十届全国高能量密度物理会议

杜应超 副教授

清华大学工程物理系副教授,《强激光与粒子束》期刊编委。2007年于清华大学工程物理系获工学博士学位。主要研究领域为基于光阴极注入器的高亮度电子束流产生、诊断及应用研究、基于高亮度电子束和超短激光的逆康普顿(汤姆逊)散射X/γ射线源关键技术及应用研究。

(报告题目:紧凑型准单能逆康普顿散射伽马源研制及应用)

报告主要内容:

Many research and applications areas, such as nuclear physics, security applications, high quality X/γ-ray radiography in medical and industrial imaging, require photon sources capable of producing gamma-ray beams in the hundreds keV to multi- MeV energy range with high fluxes and compact footprints. Recently, a very compact quasi-monochromatic, multi-MeV gamma-ray source based on Inverse Compton Scattering (ICS), called VIGAS, is proposed at accelerator laboratory, Tsinghua University. In design, by combining S-band photoinjector and high gradient X-band tubes with accelerating gradient over 80MV/m, the facility is very compact with total length less than 13 m. Meanwhile high brightness beam can be obtained with energy up to 350MeV and normalized emittance <0.6 mm-mrad at 200 pC charge. The incident laser is selected as center wavelength 800 nm, pulse energy >1.5 J and pulse length <10 ps FWHM. The flux of this source is >4×108 phs./s @ 0.2-2.4 MeV. By doubling the frequency of incident laser, gamma-ray energy can expand to 2.4-4.8 MeV. This facility is funded by NSFC from 2021-2025. Now the main components such as S-band injector, UV driving laser and the incident laser system, RF power system, and synchronization system, etc., are ready for installation. The commissioning will start in the latter half of this year and will be completed in the end of 2025. The unique gamma-ray beam will be used for advanced imaging and the material analysis based on the nuclear resonance fluorescence (NRF).