The Reflection Grating Arrays are attached to two of the primary telescopes.
2.
The two telescopes with Reflection Grating Arrays weigh an additional.
3.
For a reflection grating, this means that the diffracted beam is back-reflected into the direction of the incident beam ( blue beam in picture ).
4.
Components of the telescopes include ( from front to rear ) the mirror assembly door, entrance and X-ray baffles, mirror module, electron deflector, a Reflection Grating Array in two of the assemblies, and exit baffle.
5.
The light is either directly focused onto the entrance slit of a monochromator and imaged onto a charged coupled device ( CCD ) array via a dispersive optical element ( e . g . a reflection grating ) or imaged onto the entrance aperture of a conventional interferometer.
6.
Instrument activation started on 4 January 2000, The Optical Monitor ( OM ) attained first light on 5 January, the two European Photon Imaging Camera ( EPIC ) pn-CCD on 22 January, and the Reflection Grating Spectrometers ( RGS ) saw first light on 2 February.
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