85 research outputs found
New high-dispersion, high-resolution X-ray spectrometer - Measurements of the chromium K alpha 1 and 2 lines
New high dispersion, high resolution X ray spectromete
A ruggedized thin-window proportional-counter tube
Design and testing of ruggedized, thin window proportional counter tube for detecting X rays in light element
Cylindrical Crystal Imaging Spectrometer (CCIS) for cosmic X-ray spectroscopy
A "stigmatic" focusing, Bragg crystal spectrometer was developed and used for high spectral resolution X-ray emission line diagnostics on hot laboratory plasmas. The concept be applied at the focal plane of an orbiting X-ray telescope where it offers several advantages over conventional spectrometers, i.e., mechanical simplicity, high resolving power and sensitivity, simultaneous measurement of an extended segment of spectrum, and good imaging properties. The instrument features a simple, unambiguous, non-scanning spectrum readout that is not adversely affected by either spacecraft pointing error or source extent. The performance of the instrument is estimated in the context of the Advanced X-Ray Astrophysical Facility mission
Dual purpose optical instrument capable of simultaneously acting as spectrometer and diffractometer
A dual purpose optical instrument is described capable of simultaneously acting as a spectrometer and diffractometer to respectively perform elemental and structural analysis of an unknown sample. The diffractometer portion of the instrument employs a modified form of Seeman-Bohlin focusing which involves providing a line source of X-rays, a sample, and a detector, all on the same focal circle. The spectrometer portion of the instrument employs a fixedly mounted X-ray energy detector mounted outside of the plane of the focal circle
Aluminized thin-window proportional-counter tube is stronger, more responsive in long wavelength region
A thin-window proportional counter tube of 0.25-mil Mylar with a thin aluminum coating on one side permits efficient detection of long wavelength X rays. It is sufficiently rugged for long-term use in space or other demanding environments
A preliminary design study for a cosmic X-ray spectrometer Interim report
Cosmic X ray spectrometer development and testin
Precise location of Sagittarius X ray sources with a rocket-borne rotating modulation collimator
Precise location of Sagittarius X ray sources with rocket-borne rotating modulation collimato
Deep far infrared ISOPHOT survey in "Selected Area 57", I. Observations and source counts
We present here the results of a deep survey in a 0.4 sq.deg. blank field in
Selected Area 57 conducted with the ISOPHOT instrument aboard ESAs Infrared
Space Observatory (ISO) at both 60 um and 90 um. The resulting sky maps have a
spatial resolution of 15 x 23 sq.arcsec. per pixel which is much higher than
the 90 x 90 sq.arcsec. pixels of the IRAS All Sky Survey. We describe the main
instrumental effects encountered in our data, outline our data reduction and
analysis scheme and present astrometry and photometry of the detected point
sources. With a formal signal to noise ratio of 6.75 we have source detection
limits of 90 mJy at 60 um and 50 mJy at 90 um. To these limits we find
cumulated number densities of 5+-3.5 per sq.deg. at 60 um and 14.8+-5.0 per
sq.deg.at 90 um. These number densities of sources are found to be lower than
previously reported results from ISO but the data do not allow us to
discriminate between no-evolution scenarios and various evolutionary models.Comment: 15 pages, 11 figures, accepted by Astronomy & Astrophysic
Visible, EUV, and X-ray Spectroscopy at the NIST EBIT Facility
After a brief introduction to the NIST EBIT facility, we present the results
of three different types of experiments that have been carried out there
recently: EUV and visible spectroscopy in support of the microelectronics
industry, laboratory astrophysics using an x-ray microcalorimeter, and charge
exchange studies using extracted beams of highly charged ions.Comment: 10 page
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