This shows the outermost section of the forward pixel detector. Each green wedge is a pixel module. “Pixel modules are complex electronic sandwiches,” Marco Verzocchi said. The silicon sensor is in the middle, the readout chips are on the bottom, and the green printed circuit is on top. The 66,650 pixels and 16 readout chips per module are all interconnected through delicate wiring and electronics.
The flexible copper cables emanating from the pixel modules bring the data collected by the silicon sensors to the readout electronics (which are hidden behind the yellow covers.) The silvery object in the middle of the photograph is the beam pipe with its support wire below. Photo: Satoshi Hasegawa, Fermilab