  For H- charge exchange (stripping) injection to European Spallation Source
(ESS) storage ring it is necessary to have H- ion source with a current of ~90
mA, pulses duration 3 ms, and repetition of 14 Hz (duty factor ~4%) extendable
to repetition up to 28 Hz (df ~8%). Magnetron surface plasma H- source (SPS)
with cesiation and active cathode and anode cooling is one of the possible
solutions. Brookhaven National Laboratory (BNL) magnetron SPS can produce H-
beam current of ~100 mA at ~2 kW discharge power and can operate up to a duty
factor of ~1 % (average power ~14 W) without the active cooling. With active
cathode and anode cooling it is possible to increase average discharge power up
to 140 W(df 8%).For the delivery of the beam to Radio Frequency Quadrupole
(RFQ) it is possible to use a short electrostatic Low Energy Beam Transport
(LEBT) as in Spallation Neutron Source (SNS).
