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This work study the effects of magnetic field topology of polywell fusion device on electron confinement time. Several polywell designs are used including a cube configuration (6 coils), dodecahedron configuration (12 coils), double-layer configuration (14 coils) and disco configuration (26 coils). The results of magnetic field structure are investigated by using numerical simulations based on finite element method. In addition,the effect of electrical current in each coil on the observe magnetic field is also investigated. Electron beams are injected into each configuration in order to determine the decay behavior of electron numbers. The probability of loss is defined with loss cone, which can be used to predict what configuration yield the most electron loss. It is found that the increase of coils current does not affect the probability of loss. However, it demonstrates that the dodecahedron configuration yield highest probability of loss. The confinement time study shows that the dodecahedron configuration yields better confinement than cube and double-layer configuration. The disco configuration yields the best results, confining electrons for the longest time of about 20 μs.
