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A study of the magnetic well created by a Yin-Yang configuration

A systematic study has been carried out varying the parameters of the Yin-Yang configuration in order to obtain the maximum mirror ratio, ℛ, for the last closed nested isobar of the magnetic well. It has been found that the maximum values of ℛ obtained are about 2.5, even when the mirror ratio along a line of force attains a large value (≃ 5). Optimization of the access for fast neutral injection is included.