Measurement of dE/dx resolution of TPC prototype with gating GEM exposed to an electron beam.
The Time Projection Chamber (TPC) can identify particle species using the energy loss (dE/dx) measured by the readout pad rows. The dE/dx resolution for the ILD (International Large Detector) -TPC for the International Linear Collider experiment is expected to have high resolution for clear identification. The dE/dx resolution of our prototype TPC with gating device (gating GEM) to suppress ions feedback was measured using the electron test beam in a magnet field at the facility in DESY. The dE/dx resolution for ILD-TPC was estimated using this test beam data. The signal charge was measured as a function of the incident angle of the beam. In this paper, we report on the measurement of the signal charge and of the dE/dx resolution.
Publisher URL: http://arxiv.org/abs/1801.04499
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