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The Moscow Institute for Nuclear Research atomic‐beam type source of polarized negative hydrogen ions is described. The production of H− ions is based on the resonant charge exchange of polarized thermal hydrogen atoms and D− ions in deuterium plasma. Improvements in the D− plasma source are outlined. The polarized source produces a pulsed H− beam with a peak current up to 1 mA and a pulse duration of 180 μs at a repetition rate of 10 Hz. The normalized emittance for 90% of the beam particles is 1.8 π mm mrad. The polarimeter of low energy H− ions is also described. The polarization of the H− ions was measured to be 0.87±0.02.

Polarized negative hydrogen ion beam with peak current of 2.5 mA has been obtained from an atomic beam-type polarized ion source of Institute for Nuclear Research, Moscow. The intensity improvement has been achieved due to increase of efficiency of conversion of polarized hydrogen atoms into polarized negative ions. New converter for production of deuterium plasma with high density of unpolarized negative ions is described. Limitations of the method and possible improvements are discussed.

A test of a storage cell in the ionizer of the atomic beam-type polarized ion source is described. The cylindrical aluminum storage cell with uncoated walls and with internal diameter 1.5 cm had been placed in the charge-exchange region of the plasma ionizer. A pulsed polarized hydrogen atomic beam was injected into the storage cell from one side, and deuterium plasma was injected from the other side through an orifice with a diameter of 3 mm. The tests were made with a pulsed deutron ion beam of 5 mA. Results of intensity and polarization measurements for the polarized proton beam extracted are presented. The intensity gain obtained with the storage cell in comparison with operation without the storage cell was measured to be 9.0. The polarization of the proton beam from the storage cell reaches 0.94±0.03. Possible schemes for production of polarized negative hydrogen ions and polarized 3He++ ions with a storage cell are discussed.

The Moscow INR atomic‐beam type source of polarized negative hydrogen ions is described. The production of H− ions is based on resonant charge exchange between polarized thermal hydrogen atoms and D− ions in a deuterium plasma. Improvements in the D− plasma source are outlined. The polarized source produces a pulsed H− beam with the peak current up to 1 mA and pulse duration of 180 μs at repetition rate 10 Hz. The normalized emittance for 90% of the beam particles is 1.8 π mm mrad. The polarization of low energy H− ions was measured to be 0.87±0.02.