X-ray diagnosis spectroscopy of laser-produced plasma

A new crystal spectrometer with high spatial and spectral resolution was designed to measure very low emissive X-ray spectra of laser-produced plasma in the 0.5 nm to 0.8 nm range.Twin channels collocated perpendicularly with two different crystal materials and forms were utilized for simultaneous measurement of spectral and spatial resolution.The imaging plate was employed to obtain high spatial resolution with effective area of 30 mm×80 mm.The basic parameters of crystals were analyzed and the design parameters of the spectrometer are presented herein.The first experiment was carried out at the 20 J energy laser facility of Research Center of Laser Fusion,CAEP.X-ray spectra were obtained from Al laser-produced plasmas with a spectral resolution of 1 000 to 1 500 for the spherically bent mica crystal spectrometer and spatial resolutions of 1.73 mm to 6.88 mm for the flat PET crystal in the same condition.It is suggested that the device be used in high-density plasma diagnostics of a single laser shot.