Accurate measurements of high energy proton beam by secondary electron compensation

Accuracy in the measurement of an intense high-energy proton beam is generally disturbed by high energy proton induced secondary electron emission. In the present work, the compensation mechanism for secondary electron emission is investigated for the accurate measurement of high-energy proton beam. An experimental approach with using three metal foils to compensate for secondary electron emission is implemented and described. The experiment is carried out on the HI-13 tandem accelerator. The current detected from the middle metal foil is 0.7% of the proton beam. The experimental results show that the measured current of the high-energy proton beam is reliable within 1%.