The Prototype of a Magnetic Field Compensator. - Alekseev, V. I.; Baskov, V. A.; Dronov, V. A.; Gorbov, L. A.; L'vov, A. I.; Koltsov, A. V.; Polyansky, V. V.; Sidorin, S. S.; Khafizova, E. A. (Bulletin of the Lebedev Physics Institute, 2024)