The study of influence factors on charge exchange efficiency of C^{2+} to C^{-} by using Geant4

摘要: A first attempt to simulate the charge exchange process of C2+ to C-, in which C2+ with low energy through an exchange medium, using the Monte Carlo Software Geant4 has been accomplished. The yields of Cq (q=-2, -1, 0 and +1) from injected C2+ with different energies into different exchange medium are measured by setting up the physical model in the simulation program. The effect of different energies (range from 60 to 300keV), different exchange medium (isobutene and methane), different density distribution of exchange medium in charge exchange cell on the charge exchange efficiency have been studied. The comparison of the present results with the experimental results shows the feasibility of this method. Moreover, the present results demonstrate that low-density diffuse regions on either side of the high-density central region in the charge exchange cell has a significant contribution to improving the charge exchange efficiency. The charge exchange efficiency in organic non-metallic gases of isobutene is higher than in methane, particularly, an efficiency close to 2% of C2+ to C- conversion can be achieved in methane.