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An electron beam of 40 MeV has been injected into the air in the field of Utah, USA for the purpose of calibrating the air fluorescence telescope of TA to observe ultra-high energy cosmic rays. The total charge of the injected beam is an important factor for the calibration, and we measured it using a current transformer for each beam injection. The response of the current transformer was calibrated by separate runs using Faraday cups to an accuracy of better than 1%. This will contribute significantly in decreasing systematic uncertainties of TA’s energy determination for cosmic rays.

Precision Charge Measurement of 40 MeV Electron-Beam to Calibrate Air Fluorescence Telescope for Cosmic Ray Observation