The DIRC front-end electronics chain for BaBar Bailly, P.; Beigbeder, C.; Bernier, R. ...
1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255),
1998, Letnik:
2
Conference Proceeding
Recent results from the front-end electronics of the Detector of Internally Reflected Cerenkov light (DIRC) for the BaBar experiment at SLAC (Stanford, USA) are presented. It measures to better than ...1 ns the arrival time of Cerenkov photoelectrons, detected in a 11,000 phototubes array and their amplitude spectra. It mainly comprises 64-channel DIRC front-end boards (DFB) equipped with eight full-custom analog chips performing zero-cross discrimination with 2 mV threshold and pulse shaping, four full-custom digital TDC chips for timing measurements with 500 ps binning and a readout logic selecting hits in the trigger window, and DIRC crate controller cards (DCC) serializing the data collected from up to 16 DFBs onto a 1.2 Gb/s optical link. Extensive test results of the pre-production chips are presented, as well as system tests.
The Front End Readout MIcrosystem, FERMI, is a representative of a new generation of data acquisition modules which utilizes modern design techniques to achieve a high acquisition rate together with ...intelligent on-line data processing. FERMI is being designed to satisfy the extreme requirements set by calorimeters in the next generation of particle physics detectors. Such detectors are being designed for the future LHC and SSC accelerators at CERN in Switzerland and at the SSC-laboratory in Texas. The calorimeters demand frequent (67 MHz for LHC, 63.5 MHz for SSC) high precision sampling of a large number of input channels (about 5x10/sup 5/). Each FERMI module serves 9 channels from which samples are AD-converted, corrected and temporarily stored in a local memory. The data is also merged into a trigger sum processed by digital filters to recover time of incidence and amplitude of incoming pulses. Such data is then fed to a first-level trigger processor which screens irrelevant information. Only data that may contain interesting information is kept for further analysis. Arrays of 50000 FERMIs constitute formidable processing systems when considering the total computational power and storage capacity.< >
