High-resolution x-ray spectrometer based on spherically bent crystals for investigations of femtosecond laser plasmas

Abstract

Ultrashort-pulse, laser-produced plasmas have become very interesting laboratory sources to study spectroscopically due to their very high densities and temperatures, and the high laser-induced electromagnetic fields present. Typically, these plasmas are of very small volume and very low emissivity. Thus, studying these near point source plasmas requires advanced experimental techniques. We present a new spectrometer design called the focusing spectrometer with spatial resolution (FSSR-2D) based on a spherically bent crystal which provides simultaneous high spectral (λ/Δλ≈104) and spatial resolution (≈10 μm) as well as high luminosity (high collection efficiency). We described in detail the FSSR-2D case in which a small, near point source plasma is investigated. An estimate for the spectral and spatial resolution for the spectrometer is outlined based on geometric considerations. Using the FSSR-2D instrument, experimental data measured from both a 100 fs and a nanosecond pulse laser-produced plasma are presented.

Analysis of high-ndielectronic Rydberg satellites in the spectra ofNa-likeZnXX andFournier1, Faenov2, Pikuz3 et al. 2004Phys. Rev. ESelf Cite112180View full textAdd to dashboardCite

“…The target step served to physically separate the two spectral images on the film. X-ray spectra in the region 7.0-9.2 Å were obtained using focusing spectrometers with spatial resolution (FSSR-2D) [20][21][22]. Three different spectrometers were used: two of them have large aperture ͑15ϫ 50 mm͒ spherically bent ͑R = 150 mm͒ mica and quartz (10-10) crystals, and one of them has a mica crystal with size 10ϫ 30 mm and a R = 100 mm radius of curvature.…”

Analysis and implementation of a space resolving spherical crystal spectrometer for x-ray Thomson scattering experiments

“…Additional image blurring resulting from spherical aberration in the sagittal plane and the intrinsic spectral resolution of the crystal in the meridional plane were neglected in this analysis. The equations for γ and D were derived by following the analysis presented by Young et al 23 The detector angle γ is given by…”

Spaced resolved analysis of suprathermal electrons in dense plasma

“…In order to obtain space resolved information about the hot electron induced X-ray emission we implemented a spherically bend quartz crystal (2d = 8.52 Angstroem) in the so called FSSR-2D scheme [12,13]. The distance between the source and the crystal was 40 cm which impose for the detector with the geometry to be at 117.7 mm from the crystal.…”