Characterizing nonlinearities in the Chandra LETG+HRC-S dispersion relation

Details Characterizing nonlinearities in the Chandra LETG+HRC-S dispersion relation Characterizing nonlinearities in the Chandra LETG+HRC-S dispersion relation

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5488...51c&link_type=abstract

UV and Gamma-Ray Space Telescope Systems. Edited by Hasinger, Günther; Turner, Martin J. L. Proceedings of the SPIE, Volume 548

Computer Science

4

Scientific paper

The Chandra Low Energy Transmission Grating Spectrometer (LETGS) is comprised of 3 micro-channel plate (MCP) segments and is primarily used with the High Resolution Camera spectroscopic array (HRC-S). In-flight calibration data observed with the LETG+HRC-S show that there are non-linear deviations in the positions of some lines by as much as 0.1~\AA. These deviations are thought to be caused by spatial non-linearities in the imaging characteristics of the HRC-S detector. Here, we present the methods we used to characterize the non-linearities of the dispersion relation across the central plate of the HRC-S, and empirical corrections which greatly reduce the observed non-linearities by a factor of 2 or more on the central MCP.

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