Data acquisition for the FRS

System architecture

At present, the FRS data acquisition consists of a single "branch" within the GSI Multti-Branch System (MBS) framework. In order to increase the data taking rate, the different tasks (readout, event building, taping etc.) are divided between two different processors - a data sender and a data receiver.

The data sender is a RIO-4 processor which resides in the FRS VME crate. The RIO-4 handles the readout of the digitizers (ADCs, QDCs etc.) and then passes the data via TCP/IP on to a Lynx-OS PC, which acts as data receiver. The latter formats the events and makes these available to analysis clients (e.g. via a remote event server) and controls taping or disk storage. The PC (and the tape station) is situated next to the storage cabinets in the electronics area of the FRS Messhütte.
 » The FRS stand-alone system
The FRS data acquisition can be run in stand-alone mode or as part of more complicated systems. An example of the latter is the setup required for the RISING project, in which data from several quasi-independent "branches" will be merged with the help of time stamp information from a common system clock.
 » The RISING DAQ setup

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