Design Of A High-yield D-D Neutron Generator With Compact Construction

Compared with D-T neutron generator, D-D neutron generator with compact construction has better safety performance due to without using radionuclide tritium, which has widely application value in neutron activation analysis, fast neutron radiography, explosives and drugs testing, etc fields. This study carried out the physical design of D-D neutron generator with compact construction with the neutron yield greater than 10-8n/s and simulation research about some related problems.Research on theoretical calculation method of neutron yield, energy spectrum, angular distribution, etc from D-D reactions has carried out, and parameters mentioned above have been given with low energy deuterium beam. After data analysis, and combined with the overall index requirements of neutron yield of D-D neutron generator, the energy of deuterium beam is determined to be 120keV, and the deuterium beam intensity in target is greater than 1mA.The overall design scheme of D-D neutron generator with compact construction is given; the structure design of duoplasmatron ion source is completed, the electric field is simulated; the structure design of neutron generator’s main body is finished, and the electric field distribution in accelerated region of the neutron generator is simulated by using Poisson and Superfish software and result shows that electric field in ion source expansion of the cup region is benefit for the focus and extract of deuterium beam, the strongest electric field of key area is about 50kV/cm, under the limitation value of high vacuum breakdown electric field 100kV/cm; the extract, acceleration and transportation condition of deuterium beam is simulated using MAGIC software, and result shows that the reasonable distance between the anode of ion source and accelerate-extract pole should be chosen from the range of 50mm-55mm, this present the diameter of beam spot is between 16mm and 20mm, these parameters can meet the overall index requirements.Designs of target and cooling system have been finished, we carried out a numerical calculation method based on research in heat transfer theory, and developed related computer program named TDDTi, then calculated the temperature of target surface. Result shows that the temperature of target surface would rise up but less than 10℃ under parameters of designed beam, which means that the target has good cooling. Then another software named ANSYS-a international general software is used to calculation the temperature distribution and rise of target surface, the results are compared with results calculated from developed program TDDTi, and there is no big difference between the results calculated using TDDTi and ANSYS, which verified the reliability of the results calculated using TDDTi.