Abstract
A reliable method for absolute calibration of a ferrite electron beam current monitor with a pulse generator has been developed and tested. The absolute accuracy of pulser calibrations and Faraday cup calibrations of the National Bureau of Standards ferrite monitor have been compared by using them both to determine the Faraday cup error. These independent determinations differ by a maximum of 0.11% and an average of 0.03% at six different energies in the 20–120 MeV range, using beam currents between 0.6 and 25 μA. Variation of the Faraday cup error with energy is shown to compare favorably with the predictions of other authors, and the good agreement is used to argue that the influence of beam microstructure on the ferrite calibration is less than 0.1%.
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