Abstract
This article reports about the design of the beam chopper for building up an intense nanosecond pulsed neutron generator, and the scheme of the accelerator and the features of its basic systems are presented. The effects of the fringing electric field of the sweeping plates and the space charge effect of the beam on the pulse duration and the emittance of the deuteron beam are studied. The chopper with an operating angular frequency of 60 MHz and the amplitude of the RF voltage is 1 kV, and it will transport deuteron beam with current of 5 mA and energy of 400 keV. The simulation results show that the full width of maximum height is about 12 ns when considering the space charge effect of the beam. However, the full width of maximum height is about 6 ns when the beam without the space charge effect. Compare to the calculated values and the simulation results, it is illustrated that the space charge effect plays an important role in the pulse width which produced by the chopper for the beam of current of several mA.
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