Measurement of source profile of proton beams generated by ultraintense laser pulses using a Thomson mass spectrometer

摘要

For measuring the source profile of proton beams, a method using a Thomson mass spectrometer, which has precise energy resolution and enables the discrimination of ion species, was proposed and applied in an experiment with irradiation of 55-fs, 6.6 X 10~(18)-W/cm~2-laser pulses on a 5-μm-thick copper tape target. The typical measured source size was 150 μm at E=400 keV and 44 μm at E=980 keV in full width at half maximum.