Abstract
The absolute calibration of the bremsstrahlung beam monitors of the INS electron synchrotron is made by using a Faraday cup and converters of known thicknesses with external electrons. The results show that the calibration constant of the quantameter is independent of the maximum photon energies from 302 MeV to 1102 MeV and the average value is (4.69±0.14)×1018 MeV/C. The calibration constant of the thick-walled ionization chamber varies slowly with the maximum photon energy and the results are consistent with the previous measurement. At the same time, the effects of saturation were investigated for these bremsstrahlung beam monitors at a maximum photon energy 1000 MeV by varying the intensity, the beam spill length and the bias voltage to the monitor, as the parameters. The results of the measurements are given and discussed in connection with the ion recombination effect.
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