Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..apr.j8005b&link_type=abstract
American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #J8.005
Physics
Scientific paper
The Chandra spacecraft has been launched successfully on July 23, 1999. The payload consists of a high resolution X-ray telescope (HRMA), two imaging detector systems in the focal plane and two transmission gratings. Each one of the two gratings can be put in the beam behind the telescope and the grating spectrometers are optimized for high and low energy, respectively. The Low Energy Transmission Grating Spectrometer (LETGS) will be described and in-flight calibration measurements will be discussed. The LETGS consists of three parts, the high resolution telescope, the transmission grating array and the detector, to read-out the spectral image. The actual grating array consists of a toroidal shaped structure which carries 180 grating elements. Each grating element in turn contains three grating facets, with a diameter of 1.5cm. The grating facets have a density of 1000 lines per mm and are supported by a fine and course support structure. The grating bars and support structures are made of gold. The wavelength range covered by the LETGS runs from a few to 160 Angstrom (4-0.08 keV). The resolution Delta lambda = 0.06 Angstrom, resulting in a resolving power of 2000 at the longest wavelengths
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