The invention belongs to the technical field of an
isotope electromagnetic separator, and specifically relates to an
ion source used for the
isotope electromagnetic separator. The
ion source is placed in a
magnetic field, and the direction of the
magnetic line of force of the
magnetic field is perpendicular to the
ion beam leading direction in the
ion source; the
ion source comprises an arc discharging chamber, a
crucible connected with the back part of the arc discharging chamber, a
crucible heating furnace cylinder arranged on the periphery of the
crucible, a negative
electrode and filaments arranged on the top of the arc discharging chamber, and a leading
electrode arranged on the front part of the arc discharging chamber; and the leading
electrode is provided with leading seams capable of leading ion beams, wherein the arc discharging chamber and the crucible are in direct sealing connection. The conventional
ion source used for the
isotope electromagnetic separator is relatively poor in
air tightness, which causes increasing of
dark current in the ion source, influences vapor density of a working substance, and wastes expensive ion
source material; and the ion source provided by the invention is high in
air tightness, so that
dark current and an ignition phenomenon are reduced, the
raw material utilization rate of the ion source and the abundance of separated isotopes are improved, and the working time of the electromagnetic separator is prolonged.