108057110
CDF DAQ upgrade and CMS DAQ R and D: event builder tests using an ATM switch
The present data acquisition system of the CDF experiment has to be upgraded for the higher luminosities expected during the Run 11 (1999+) data-taking period. The core of the system, consisting of a control network based on reflective memories will remain the same. The network used for data transfers, however, will have to be changed. We have investigated ATM as a possible replacement technology for the current Ultranet switch. We present preliminary results on this new ATM-based event builder system.
18064411
ATM based event building and PC based level 3 trigger at CDF
Baseline event building and Level 3 trigger processing at the CDF experiment at Fermilab is speciied to process about 300 events/s with an average event size of about 150 KB. First, the event must be assembled from fragments originating from approximately 16 readout sources, with individual average fragment sizes ranging from 12 to 16 KB. Then the Level 3 processor-based trigger performs reconstruction and ltering tasks requiring in excess of 45000 MIPS of CPU power on the assembled events. We present a distributed, scalable architecture using commodity components: VME-based CPU modules for the readout, an ATM switch for event buildling, and Pentium-based PC's running Linux for event processing. Pentium-based PC's are also used for event distribution throughout and collection from the Level 3 processors via multiple 100 Mbps Ethernets. We report on preliminary studies conducted at CDF with a small-scale prototype. This architecture is also a possible candidate for the CMS experiment at LHC.
125929856
Measurement of the CP violation parameter sin 2-beta
117069100
Proportional mode operation of a gas pixel device
We report streamer‐ and proportional‐mode operation of a spherical‐anode gas pixel device. Also, signals resulting from electrons liberated by UV light striking the cathode were seen to be proportional to the light intensity, suggesting the use of the device for calorimetry readout.