A neutron source for boron capture neutron therapy is under development at the Budker Institute of Nuclear Physics (BINP). It is based on a tandem vacuum-isolated accelerator using a dc negative hydrogen ion source. A compact dc ion source model having reliable operation and simplified maintenance was developed at BINP as a prototype of the high current source for the medicine accelerator. The compact model (CM) uses a glow discharge with modified Penning geometry of the electrodes and explores surface–plasma negative ion (NI) production on the cesiated anode surface. The CM optimal parameters are as follows: discharge voltage 60–80 V, discharge current up to 6 A, hydrogen pressure 4–5 Pa, cesium consumption <1 mg/h, transverse magnetic field 0.5–1 kG s, optimal anode temperature 250–350 °C. A built-in heater provides the CM a quick start and simplifies CM electrode conditioning. The CM delivers a NI beam with a current of 5 mA, beam energy of 17 keV, normalized emittance of about 0.3 π mm mrad and an emission current density of about 0.1 A/cm2. NI beam current is directly proportional to the discharge current and to the emission hole area. The CM quick start and stable dc o
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