A current of 30 mA has been extracted from a volume production H−source having a toroidal discharge chamber and rotational symmetry. This is a current density of 30 mA/cm2. The emittance measurement gave a normalized, 90% value of &egr;N(90%)=0.32 &pgr; mm‐mrad for a 13 mA beam. The ion temperature is estimated to be 0.57 eV for this case. For 25.5 mA, &egr;N(90%)=1.1 &pgr; mm‐mrad was measured, but the true value is most likely smaller due to a limitation in the emittance resolution.