Several diagnostic methods for high fluence electron beam parameters

After briefly analyzing the technical difficulties of diagnosing high fluence electron beam, three new methods for diagnosing parameters, including filtered Farady cup for measurement of the electron transient effective incident angle, Farady multi-cup for measurement of the time-resolved current density and graphite calorimeter for measuring the total beam energy with correction, are presented. In the condition of space voltage 1.08 MV and current 484 kA on the diode of flash-2 accelerator, in the distance 20.5 cm from cathode total beam energy is 19.1 kJ, and 22 kJ after correction. Measurement of radial and azimuthal current density on the beam cross-section in different time and energy fluence on beam spot center with 13% more than its average value for the beam is also presented. In the condition of magnetic lens ratio 3.5, on the moment of voltage peak 1.2 MV average electron incident angle of 73° is measured. It's shown by experiment and calculation that the main factories of influence on average electron incident angle are electron energy, magnetic lens ratio and target position.