[en] Stable discharges in the tokamak with a superconducting winding of a longitudinal magnetic field are obttained and investigated. Stable discharge currents constitute Isub(p)=150-180 kA at by- pass voltage U=1.6-2.8 B and q=2.6-3.1. It is shown, that the superconducting winding is insensitive to variable magnetic field perturbations. A complete applicability of the device with the superconducting toroidal magnetic field system is shown for conducting regular plasma experiments. The interval between discharge pulses reached 3 min at discharge current up to 240 kA. An obvious achievement of the present experiment series is to be considered a continuous operation of the device and its cryogenic complex during two months, f or this period impurity freezing in a refrigerator occuring several times. It turned to be possible however to stop coolant supply to the superconducting magnetic system, heat the refrigerator, blow it through and to return to the working mode for 3-4 h