The plasma lens is investigated for focusing of a proton beam of energy 5 MeV, current 10 mA, and pulse duration 30 &mgr;s, obtained on the accelerator “Ural-5” with radio-frequency quadrupole (RFQ) radial-phase focusing. The parameters of the plasma flow produced by a coaxial plasma gun are the following: plasma density1011–1015 cm−3,temperature 1–3 eV, velocity107 cm/s,and time duration 500 &mgr;s. The magnetic-field value of a short coil is 500–1000 Oe. The focusing coefficient is ten times the compression at the length of 30 cm obtained. The dependence of ion-beam size upon various parameters of the plasma lens is investigated. ©1998 American Institute of Physics.