Measurement of the Z boson cross-section in - Harvard University ...

Chapter 2: The Accelerator and the Experiment 65
an event, and reduces the event rate to 300 Hz. The size of a raw event is O(1 MB).
The amount of data recorded by ATLAS in a year is of the order of a Petabyte (10 15
bytes).
Besides controlling data movement among the trigger levels, the TDAQ system
manages the configuration, control and monitoring of the detector via the Detec-
tor Control System (DCS). The DCS is an interface to all the subdetectors and the
infrastructure of ATLAS. It monitors operational parameters such as temperature,
magnetic field, high- and low-voltage systems and gas systems, and provides for bidi-
rectional communication with the TDAQ.