Development of an on-line data quality monitor for the relativistic heavy-ion experiment ALICE

The on-line data monitoring tool developed for the coming ALICE experiment at LHC, CERN is presented. This monitoring tool which is a part of the ALICE-DAQ software framework, written entirely in C++ language, uses standard Linux tools in conjunction with the data display and analysis package ROOT, developed at CERN. It allows checking the consistency and quality of the data and correct functioning of the various sub-detectors either at run time or during off line by playing back the recorded raw data. After discussing the functionality and performance of this package, the experience gained during the test beam periods is also summarized.