Structure and software of the data acquisition network node in the SPASCHARM experiment

摘要

An intelligent crate controller controlled by the built-in ARM system has been developed for the new EuroMISS front-end electronics of the SPASCHARM experiment at the Institute for High Energy Physics (IHEP). The first version has a 250-Mbyte buffer memory and is capable of transmitting data to the network with a rate up to 70 Mbit/s. Building a computer into each crate with electronics has made it possible to produce distributed data acquisition and slow control systems of the setup. Principles of interaction of the crate controller, front-end electronics, and network data acquisition system are stated.