CBDA - CYCLOTRON BEAM DYNAMICS ANALYSIS CODE

A need for intense cyclotron beam requires to minimize the particle losses during injection, acceleration and extraction from the machine. More importance is given to the computational tools that are needed to optimise the design. The 3D CBDA program has been prepared for this purpose. The basic features of this code are: 1) The accelerated beam axial motion with analysis of the particle losses at the limiting aperture surfaces to estimate the transmission efficiency of the beam through cyclotron; 2) Very detailed 3D electrical and magnetic field maps generated and introduced into the code; 3) Simulation of the space charge dominated beam acceleration; taking into account Coulomb repulsion of particles in the beam by PIC (FFT) and PP methods; 4) Enhanced post-processing of the results by means of MathCAD and AutoCAD/SolidEdge software. Some efforts were undertaken to provide user friendliness of the code, including initial documentation and its menu driven operation. Several cross checks of the CBDA simulation results (fields and beam dynamics) compared with other studies have been successfully performed. A number of applications of the code simulate the functionality and design of various cyclotrons is given. They are: VINCY Cyclotron (Belgrade) [1]; 1.747 MeV, 5mA, H ¯ Customs cyclotron [2]; RIKEN AVF cyclotron (Japan) [3] etc. The present status of the code allows to provide efficient and realistic beam dynamics analysis for the new cyclotron design and operational cyclotron upgrade. STRUCTURE Figure 1 shows the main window of the CBDA code. The “Pre-Processor ” part of the code consists of six main blocks: “Particle”, “RF system”, “Injection line”,