Research Of The Two-channel Elliptical Crystal Spectrometer In The 620～6200-eV X-ray Region

The X-ray spectra emitted from laser-produced plasmas contain plentiful information. It is a powerful tool to carry out plasma diagnosis and to study the formation and evolution of the plasmas as well. It plays a significant role in the field of inertial confinement fusion. In this paper we expatiate the importance of using the X-ray to detect the laser-produced plasmas and developing the two-channel elliptical crystal spectrometer (TCECS) in the 620~6200-eV X-ray region. We use the basic theory of the X-ray diffraction for crystal to research the structure design of TCECS. TCECS should possess some characters as follow:â‘  Belong to the focus-bend-crystal spectrometer. Its fundamental is that the ray emitted from a focus (front) of elliptical will flock together on the other focus (back) by the reflection on the elliptical surface. We set a scatter aperture on the back focus. Through the aperture the X-ray will shoot on the detector and goes on record.â‘¡ High resolving power.â‘¢ Twin channels are utilized for simultaneous time-integrated photographic recording and for time-resolved X-ray streak camera recording.â‘£ Operate neatly and assemble conveniently.Firstly, we discuss the basic theory of the X-ray diffraction for crystal and the crystal spectrometer in detecting X-ray. Utilizing the outstanding merits of the focus-bend-crystal spectrometer. TCECS's resolving power is enhanced greatly by introducing the elliptical crystal.Secondly, according to the basic theory of the general spectrometer, in this paper we discuss the fundamental, the compositions and the characters of TCECS. We analyze the main influencing factors for resolving power, such as the dispersion of the X-ray on the detection circle, spectra location error and the aperture width etc. And we put out the ways to resolving the problems.Finally, the paper analyses and discusses the collectivity design, the optics system design (dispersion system, imaging system and the recording system) and the typical mechanism design. Then, it presents the total assemble graph of the spectrometer and the projects for aiming and alignment of TCECS. Especially, Twin channels are utilizedfor simultaneous time-integrated photographic recording and for time-resolved X-ray streak camera recording. It saves the time and the cost for obtaining the eigen-spectra the X-ray spectra emitted from laser-produced plasmas.At present, the design and the manufacture of TCECS have been completed. It will be applied to the "Shenguang-II" laser-fusion target room. Through the experiments we will obtain the datum of the X-ray which be analyzed and acquire the results. It will be used to study nuclear physics basic task...