Auger at the Telescope Array: toward a direct cross-calibration of surface-detector stations
August 16, 2017
August 03, 2018
Since 2007 the Telescope Array Project (TA) and Pierre Auger Observatory (Auger) have collected extensive data sets spanning several orders of magnitude of the cosmic-ray spectrum. In both experiments the majority of data is generated from the surface-detector (SD) array as a result of its very high duty cycle. These data are then calibrated for energy with fluorescence detectors using a hybrid approach. The TA and Auger experiments use different SD station designs, giving them different sensitivities to extensive air-shower components. We seek to understand and cross-validate these complementary detectors on a hardware level. In this paper we present an update on the progress of this in-situ cross-calibration program. Presently two Auger water-Cherenkov detectors and two TA scintillator stations are co-located at the TA central laser facility (CLF). We review the hardware enabling the readout of these detectors for high-energy events. Additionally, we show expanded calibration data sets of minimum-ionizing particle (MIP) versus vertical-equivalent muon (VEM) responses, along with preliminary results for the Auger doublet. A sample event reconstruction displaying observed Auger and TA signals is also presented.
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