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COS Bright Object Protection

The Cosmic Origins Spectrograph (COS) utilizes two channels to detect photons: a farUV (FUV) channel for the 1175 – 1775 Å wavelength range, and a near-UV (NUV) channel for the range 1750 – 3200 Å. The FUV detector system is a microchannel-plate (MCP) array with a cross delay-line (XDL), very similar to the double-delay line detector flown on the FUSE mission. The system is divided into two segments, each of them operable independently, in order to record the full length of the projected COS spectrum. In the NUV, a multi-anode microchannel array (MAMA) is used. This detector is functionally identical to the STIS MAMA detector.