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Description
The calculation of high-energy beam lines consists of tracing of the proton beam trajectories along the transport channel from the source. The PROTON_MK program code was developed to carry out such calculations using the Monte Carlo method. The beam from the accelerator is introduced in the form of a multivariate Gaussian distribution in x,x’, z,z’, dp/p phase space. In the case when an absorber (absorber, air section, window in the channel, etc.) is installed in the transport channel the beam parameters after the absorber are calculated using the GEANT4. The output file of this code can be used as input for the program. The program allows calculation of any beam parameters - intensity, spatial or phase density, energy distribution, etc. The program includes a block for the optimization of beam parameters presented in a functional form. Random search method with learning for search correction based on analysis of intermediate results (so-called statistical gradient method) is used for obtaining the global maximum of a function of many variables.
The algorithm was tested during the development of the beams with energy of 100–900 MeV by decelerating the primary proton beam with energy of 1000 MeV in a cop-per absorber.
Based on the results of measuring the beam profiles of various energies and comparing them with the calculated profiles, a conclusion was made about goodness of fit of the algorithm.
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