Chapter 4:
Description and Performance of the COS Detectors

4.1 The FUV XDL Detector

4.1.1 XDL Properties

4.1.2 XDL Spectrum Response

4.1.3 XDL Dark Rate

4.1.4 XDL Read-out Format

4.1.5 Stim Pulses

4.1.6 Pulse-height Distributions

4.1.7 Non-linear Photon Counting Effects (Dead Time)

4.1.8 Spatial Variation of the Dark Rate

4.2 The NUV MAMA Detector

4.2.1 MAMA Properties

4.2.2 MAMA Spectrum Response

4.2.3 MAMA Dark Rate

4.2.4 MAMA Read-Out Format

4.2.5 MAMA Dead Time

4.2.6 Non-Gaussian Wings in the MAMA PSF