Objective double-crystal spectrometer

摘要

The solar corona, supernova remnants, the hot diffuse interstellar gas in our galaxy, galactic halos, and the hot intracluster gas in rich clusters of galaxies are examples of extended astrophysical plasmas that emit line rich spectra in the x-ray spectral range 1.5 angstrom $LS $lambda $LS 25 angstroms. These phenomena represent a significant fraction of the baryonic matter in the universe. The study of the composition, structure, and dynamics of these astrophysical plasmas requires observations with both high spectral and spatial resolution simultaneously. The objective double crystal spectrometer coupled with a grazing incidence x- ray telescope represents a stigmatic instrument that is highly efficient for the study of such sources. We describe the configuration and performance (spatial resolution, spectral resolution, and efficiency) of the objective double crystal spectrometer.