Design Of The Two-channel Elliptical Crystal Spectrometer And Experiment Research

X-ray spectra can be used as significant diagnosis method in the research of Inertial Confinement Fusion to obtain density, temperature, uniform ionization degree, and other important information of electron. Reviewing the present status of study and application of x-ray detection spectrometer, a new spectrographic system has been developed for the absolute spectrometry of laser pulsed intensity x-ray diagnosis in the 0.2nm-2nm region, using crystal analyzer of KAP, LiF, MiCa, and PET. Twin channels are utilized for simultaneous time-resolved film or X-CCD recording and for space-resolved streak camera recording.The generation mechanism of laser pulsed plasma x-ray and the theory basis of x-ray crystal diffraction has been discussed. The general characteristics are compared for the plane, convex, and concave crystal analyzers, which may be applied to the x-ray diagnosis. The unique advantages of the elliptical analyzer for precise spectral measurements are noted and detailed descriptions of its geometrical and physical optics are presented.Optical system design for spectrometer has been developed taking the advantage of ellipse focusing geometry theory. The 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. Through the aperture setting on the back focus, the x-ray will shoot on the detector and goes on record. Basic optical system constitution and characteristic parameter of the two-channel elliptical crystal spectrometer has presented. Research on parameter selection and craftworks of elliptical crystal analyzer has been explored. Basic constitution of construction design for spectrometer has been described particularly. An adjustment method has been advanced which make the two channel crystals as a unity. With the comprising of two aiming scheme, the better scheme has been chosen. The dispersion degree of wavelength along the detection circle, the relationship between the luminosity magnitude dβ/dχ and dispersion angle dβ, and the effect of an off-axis position of a source point, these three facts that contribute to the spectral line precision are deeply analyzed. The conclusion that directs the optimizing design has presented.The experiment using the vacuum system on the spectrometer, demonstrated that the vacuum degree in the spectrometer was up to 10-3Pa, satisfying the working requirement of streak camera. The aiming experiment using a simulate point source demonstrate that the aiming scheme satisfied the target chamber effectively and conveniently.At last, the intensity laser target practice experiment has been made on the SG target chamber and XG target chamber. The spectra in the 0.2nm-2nm region has been recorded using X-CCD. The best spectra resolve rate demonstrated up to 0.0011nm. The next work are improving spectra resolving power and experiment of time-resolved channel.