The CLEO-II silicon vertex detector data acquisition system

Early in 1994, a new silicon vertex detector (SVD) will be installed in the CLEO II experiment at the Cornell e⁺e^- storage ring (CESR). This device consists of three concentric layers of planar, double-sided silicon strip detectors containing a total of 26624 analog channels. The authors describe the SVD data acquisition (DAQ) system which provides the link between the signals on individual silicon strips and the existing CLEO II readout system. The DAQ system described is capable of reading out the 26624 channels of the new CLEO-II silicon vertex detector in approximately 200 μs, which is a factor of ten faster than the current CLEO-II readout. Thus, the SVD DAQ can accommodate further increases in accelerator luminosity. A 68040 CPU on each databoard makes it possible to sparsify the data in a few milliseconds in compliance with the existing CLEO-II DAQ system