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New isotope math xmlns="http://www.w3.org/1998/Math/MathML">mmultiscri pts>mi>Mc/mi>mprescripts>/mprescripts>none>/none> mn>286/mn>/mmultiscripts>/math> produced in the math xmlns="http://www.w3.org/1998/Math/MathML">mrow>m multiscripts>mi>Am/mi>mprescripts>/mprescripts>none >/none>mn>243/mn>/mmultiscripts>mo>+/mo>mmultis cripts>mi>Ca/mi>mprescripts>/mprescripts>none>/none >mn>48/mn>/mmultiscripts>/mrow>/math> reaction Yu. Ts. Oganessian et al.

Dubna Gas-Filled Recoil Separator (DGFRS-2) is a new facility at the Super Heavy Element Factory which allows us to study the properties of superheavy elements (SHEs) formed in complete fusion reactions in the femtobarn cross-section range. High dispersion and complex magnetic configuration make it difficult to tune the separator and find the optimal current values in the magnetic elements. This work presents a simulation model of the DGFRS-2 based on a GEANT4 toolkit. The main methods of trajectory simulations of heavy ions in gaseous media are discussed and several new processes are implemented in GEANT4. Calculation results agreed well with the data produced in test experiments which allows us to use this model for transmission determination and tuning of the separator in experiments aimed at SHE investigations.