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Summary form only given, as follows. A microwave discharge produced in magnetic trap by powerful millimeter wave radiation is new and quite distinctive object of plasma physics. Experiments have demonstrated that, Under such conditions, nonequilibrium (the temperature of electrons is much higher than the temperature of ions) plasma can be obtained in a large volume with a high, close to unity, degree of gas ionization. It has been shown that two regimes of plasma confinement can be realized Classical (Pastukhov) confinement with anisotropic electron velocity distribution function can be obtained for low plasma. density and high electron temperature of electrons. For the plasma density exceeding certain value a quasi-gasdynamic regime is realized with filled loss cone and isotropic electron velocity distribution function. Calculation results and experimental data are agreed well, especially in the part of estimation of plasma confinement time, ion composition of plasma, and total current of extracted ions. Microwave discharge in a, magnetic field under the ECR conditions is an effective source of multi-charged ions. Present experimental researches have verified that plasma with high average ion charge can be produced in the trap when the classical regime of plasma confinement with strongly anisotropic electron velocity distribution function is realized. Ion charge state distribution with temporal resolution in gases of light-weight elements has been investigated.