A small liquid argon Time Projection Chamber (LAr TPC) was operated for thefirst time in a magnetic field of 0.55 Tesla. The imaging properties of thedetector were not affected by the magnetic field. In a test run with cosmicrays a sample of through going and stopping muons was collected. The chamberwith the readout electronics and the experimental setup are described. A fewselected events were reconstructed and analyzed and the results are presented.The magnetic bending of the charged particle tracks allows the determination ofthe electric charge and the momentum, even for particles not fully contained inthe drift chamber. These features are e.g. required for future neutrinodetectors at a neutrino factory.
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