Calibration of a High Resolution Soft X-Ray Spectrometer

Abstract

A high resolution grating spectrometer (HRGS) with 2400 line/mm variable line spacing grating for the 10 – 50 Å wavelength range has been designed for laser—produced plasma experiments at the Lawrence Livermore National Laboratory (LLNL). The spectrometer has a large radius of curvature, R=44.3 m, is operated at a 2° grazing angle and can record high signal-to-noise spectra when used with a low-noise, cooled, charge-coupled device detector. The instrument can be operated with a 10 – 25 μm wide slit to achieve the best spectral resolving power on laser plasma sources, approaching 2000, or in slitless mode with a small symmetrical emission source. Results will be presented for the spectral response of the spectrometer cross-calibrated at the LLNL Electron Beam Ion Trap facility using the broadband x-ray energy EBIT Calorimeter Spectrometer (ECS).KeywordsLawrence Livermore National LaboratoryLine Intensity RatioGrating ReflectivitySpectrometer SensitivityLaser Plasma SourceThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.