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The Time Projection Chamber (TPC) can identify particle species using theenergy loss (dE/dx) measured by the readout pad rows. The dE/dx resolution forthe ILD (International Large Detector) -TPC for the International LinearCollider experiment is expected to have high resolution for clearidentification. The dE/dx resolution of our prototype TPC with gating device(gating GEM) to suppress ions feedback was measured using the electron testbeam in a magnet field at the facility in DESY. The dE/dx resolution forILD-TPC was estimated using this test beam data. The signal charge was measuredas a function of the incident angle of the beam. In this paper, we report onthe measurement of the signal charge and of the dE/dx resolution.

Measurement of dE/dx resolution of TPC prototype with gating GEM exposed to an electron beam