Smart-readout of the Skipper-CCD: Achieving Sub-electron Noise Levels in Regions of Interest

TL;DR

This paper introduces a smart readout method for skipper-CCD sensors that selectively performs multiple measurements in regions of interest, achieving sub-electron noise levels efficiently by reducing unnecessary measurements in less critical areas.

Contribution

The paper presents a novel adaptive readout technique that optimizes measurement efforts in skipper-CCD sensors based on user-defined regions of interest.

Findings

Achieves sub-electron noise levels in targeted regions.

Reduces total readout time by focusing measurements on regions of interest.

Demonstrates effective noise reduction with fewer measurements in non-critical areas.

Abstract

The skipper CCD is a special type of charge coupled device in which the readout noise can be reduced to sub-electron levels by averaging independent measurements of the same charge. Thus the charge in the pixels can be determined by counting the exact number of electrons. The total readout time is proportional to the number of measurements of the charge in each pixel. For some applications this time may be too long; however, researchers usually are interested only on certain region within the matrix of pixels. In this paper we present the development of a smart skipper readout technique that allows the user to specify regions of interest of the CCD matrix where an arbitrary (high) number of measurements of the same charge can taken to obtain the desired noise level, and far less measurements are performed in those regions that are less interesting to the researcher, therefore reducing the total readout time.