Ryan Herbst


Pictures Of CXI Detector

by on Apr.02, 2010, under SLAC

Here are two pictures of 1/4 of the SLAC LCLS CXI detector. Here you see a quadrant containing 4 separate modules consisting of 2 diode modules. Each diode module (the shiny reflective surface) is bump bonded onto two amplifier/readout ASICs. The diode modules and the readout ASICs where designed by a group at Cornell. The flexible carrier board (the brown cable plugged into the green board), the two green circuit boards and the rest of the readout electronics are my design. One of the two circuit boards contains analog support circuits which contain a series of digital potentiometers to set bias currents and some buffers for the digital control lines. The second circuit board contains an FPGA which operates the 16 readout ASICs, reads out the data and sends it over a proprietary protocol.

A concentrator board is connected to four of these quadrants and formats the data before sending that data to the LCLS data acquisition system. The entire system generates around 5Gbps of data when running at 120hz.

The purpose of the CXI detector is to record X-Rays of biological samples at LCLS. You can read more about the LCLS experiment here.


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