Abstract: To study intense beam transfer in double-cylinder accelerate lens,a matrix method is applied to transport matrixs in double-cylinder accelerate lens of non-intense and intense beams.A computer code DCALENS was written for pulsed beams transporting in double-cylinder accelerate lens.Optimization techniques are used for given optical conditions.Iteration procedures are adopted to obtain self-consistent solutions in DCALENS.Calculations made by DCALENS and other codes are compared and analyzed.It shows that the greater the beam current,the more apparent beam envelope lateral divergence,as well as the space-charge effect.As beam current is greater than 2A,beam envelope lateral divergence is obvious.

Key words: intense beam, double-cylinder accelerate lens, matrix method, iteration method