Computation of Magnetic Fields in Open Traps with Oppositely Directed Fields

The article presents the results of numerical calculation of the magnetic field in open traps. The magnetic field in traps is generated by a system of circular conductors carrying currents in opposite directions. Each pair of conductors creates a magnetic field configuration of so-called cusped geometry (an “antiprobkotron”). Such configurations may be called traps with oppositely directed fields. Their main shortcoming is the high loss of particles along the magnetic forcelines through the annular slit and the axial opening. These particle losses are reduced by introducing a system of conductors with different configurations of circular loops that carry currents in opposite directions. The magnetic fields of the complex system of current carrying loops are calculated by summing over all pairs of conductors. Computation results are reported for open traps with a cusped magnetic field (“antiprobkotrons”) for various configurations of conductor pairs.