To study intense beam transfer in electrostatic quadrupole

the matrix method was applied to analyze the transport matrixes in electrostatic quadrupole of non-intense beam and intense beam respectively

and a computer code was written for the pulsed beam transporting in electrostatic quadrupole.Optimization techniques were used to solve for the given optical conditions and iteration procedures were adopted to obtain self-consistent solutions in this computer code.The calculations were made by using the code and other codes under the condition of different beam currents

and the simulation results were compared and analyzed.The results show that the more intense the beam current

the more powerful the space-charge effect and the greater the deviation of non-self-consistent solution and self-consistent solution.