Laser-Plasma Electron Acceleration And Inverse Compton Scattering

In the past decades,the research on the interaction between the ultraintense-ultrashort pulse and matter based on chirped pulse amplification technology has made significant progress,which has promoted the rapid development of the many disciplines such as ultrafast X-ray absorption spectroscopy,dynamic pump detection and laboratory astrophysics,etc.This dissertation experimentally studies the laser-driven electron acceleration,inverse Compton scattering X-ray source and Kα X-ray source generation based on the interaction between ultraintense laser and plasma.Chapter 1 is the introduction part.Firstly,the development of laser plasma wakefield electron acceleration is briefly introduced and classified.The relevant parameters affecting the quality of electron bunches is analyzed in detail.The second part introduces the laser-driven inverse Compton scattering X-ray source and its development history.Besides,the methods how to improve the quality of the X-ray source is introduced.Chapter 2 introduces how to optimize the electron beam quality in laser wakefield acceleration.The effects of the types of gas(nitrogen and helium),laser energy,plasma density,focus position,pulse duration,and angular chirp on the quality of electrons are systematically investigated.It has been found that changing the magnitude of the second-order dispersion of Dazzler will change the pulse front tilt,which will result in the changes of electron’s center position in the direction of polarization.Consequently,the second-order dispersion has a compensating effect on the generation of electrons with respect to the angular chirp.Chapter 3 introduces the inverse Compton scattering hard X-ray source obtained on the self-synchronized combination of laser-driven pure nitrogen plasma accelerator and plasma mirror using the 15 TW laser system at Institute of Physics,CAS.In pure nitrogen with low back pressure,the laser energy transmission rate is enhanced to 95%.The stable electron beams are also generated in low plasma density.Furthermore,the intensity of reflected laser pulse is improved through the ingenious design and the hard X-ray yield is enhanced to 4.5×107.Chapter 4 briefly introduces the generation of ultra-fast Kα X-ray sources based on the laser plasma interactions.The samples are clearly imaged with the use of this stable X-ray source.