  The patterns of reversible changes in the critical current and discrete
current states of a structure in the form of a superconducting quantum
interferometer shunted by superconducting inductance, as a result of passing an
alternating transport current through the structure and applying an external
alternating magnetic field simultaneously with a direct transport current, was
established. A new type of discrete stationary state was discovered during the
transition of the interferometer to the resistive state caused by the combined
action of direct and alternating transport currents.
