To diagnose the presence of electron beams in high-temperature plasmas

polarization spectroscopy of x-ray lines is a useful diagnostic method to measure directly the presence of hot electron velocity distribution function inside a strong intense laser fusion produced plasmas. A novel polaried spectroscopy is designed and manufactured based on spatial resolution in laser-product plasmas experiments. This measurement relies on the sensitivity of two crystal spectrometers to the linear polarization of x-ray lines which depends on the value of the Bragg angle. The differential transmission spectrum representing the difference between the values of transmission for linearly polarized radiation with the orthogonal polarizations that are parallel and perpendicular to the optical axis is obtained with crystals at two different Bragg angles. One of dispersive elements is PET flat crystal set parallel channel

and another is Mica spherically bent crystal installed perpendicular channel

whose radius is 380 mm.The image plate

the effective area of 30×80mm

is employed to record the spatial-resolved spectrum of polarization spectroscopy of x-ray lines. The designed long optical path of the X-ray spectrometer beam is about 980mm from the source to the crystal and the detector. The first experiment was carried out at the 2×10J laser facility of Research Center of Laser Fusion

China Academy of Engineering Physics (CAEP); the X-ray spectrum emitted from the aluminum plasmas was recorded by the image plate. These experimental results show that x-ray polarization spectroscopy is a good tool for diagnosing high-density plasmas created by lasers and that this diagnostic technique could also be applied to other areas of high-temperature plasma research.