• M. Kalliokoski, F. Garcia, A. Numminen, E.M. Tuominen
  HIP, University of Helsinki
• R. Janik, M. Pikna, B. Sitar, P. Strmen, I. Szarka
  Comenius University in Bratislava, Faculty of Mathematics Physics and Informatics, Bratislava
• R. Lauhakangas
  Helsinki University, Department of Physics, University of Helsinki

The Super-FRS is a superconducting fragment separator that will be built as part of the FAIR facility. For the slow-extraction part of the beam diagnostics system a total of 32 detectors are needed for beam monitoring and for tracking and characterization of the produced ions. Since GEM-TPC detectors can perform over wide dynamic range without disturbing the beam, they are suitable for this kind of in-beam detection. We have studied the performance of a prototype GEM-TPC. The current status of the prototype detector and the measurement results are shown.