TEST BEAM Clause Samples

TEST BEAM. In a second step, the first sensor modules were tested with the old DAQ system in the test beam area T24 at DESY in August/September 2018. The calibration was repeated in the test beam area due to environmental and shielding changes, which shows an expected lower noise level at ~0.28 fC, see red histogram in Figure 8 (left). Both self-trigger and auto-trigger modes were tested and show good results. The test setup is shown in Figure 9, where two crossed PMT fingers were used to provide external triggers to the system, and a hexagonal pixel ECal sensor with same readout was used as a reference.