Hard X-ray Spectral Diagnosis

In the field of inertial confinement fusion,pre-heat in the fuel and symmetry of the imploding target can be obtained by passive diagnostics of hard X-ray emission in the shell.While active diagnostics using X-ray probe can give information about symmetry and areal density.Beside these,new generation of X-ray source based on laser plasma emission show promising future in areas like medical photography,national defense and basic science,which all rely on high accuracy measurement of the hard X-ray spectrum of laser plasma emission.Devices like Single photon CCD(2-60keV),stack filter spectrometer(10-1000keV),transmissive bent crystal spectrometer(10-140keV),Ross filter pairs(18-90keV),filter fluorescence spectrometer,Compton recoil spectrometer are frequently used in X-ray diagnostics.In this thesis,we mainly do research and make improvement on single photon CCD and Compton recoil spectrometer,with the complementation of the characteristic parameter study on one key image record device in these systems-the image plate.Silicon based single photon CCD usually have the working X-ray energy range of 2-20keV.We expand that to 2-60keV for the first time.Calibration was done in range 20-100keV,characteristic line of sliver and energy bump of recoiled electrons is discovered in the spectrum.Numerical analysis on these data in past works need a count ratio below 0.5%.By developing new methods on post processing,we relax that restraint greatly to 5%while still capable of extract the genuine X-ray spectrum information.Compton recoil spectrometer has the advantage in measuring the over MeV range,but at the cost of large size and heavy weight.A compact device is developed to tackle the problem by greatly reduce the size and weight while maintaining its capability in measurement.3 parts consist of magnetic field design,mechanical drawing and selection of scatter material is listed to illustrate our work.Reliability is validated by experiment.Endeavour like refining resolution on both sides of the energy spectrum and suppression of noise are made in the process.Hard X-ray detection heavily rely on image plates as the recording media.One of the most wildly used product of them experience great changes in scanner,storage and recording format when transfer from Fuji to General Electrics,which make analysis on data much more complicated.We introduce in our work the the basic principle,construction,physical properties and scanner parameter.Then we focus on calibration,operation and data format of the IP product from GE accompanied with studies on some of the critical characters.Energy response coefficient is derived by experiment and simulation,together with the correction formula for compensating different scan settings,thus enable us to derive an energy response independent of scan settings but only related to the IP itself.