Polarised Deuterons at the Jinr Accelerator Nuclotron

For the first time since the old Synchrophasotron machine was shut down, polarised deuterons have been accelerated at the new SC Nuclotron accelerator. The polarisation of the beam was measured by several polarimeters: after the 10 MeV linac, inside the accelerator ring, and after beam extraction. The high value of the vector polarisation Pz of the deuteron beam during acceleration was confirmed by all polarimeters to be +0.62 and -0.56. The intensity of the polarised deuteron beam in a short one-turn injection mode (8 μs) was observed to be 1.3*10⁸↑d/pulse. To increase the intensity of the accelerated polarised beam, multiturn charge exchange injection should be used. A polarised ↑D^- ion source is required. The existing ↑D⁺ source POLARIS was rebuilt as a ↑D^- source. A new plasma ↑D^- charge exchange ionizer was developed and tested. First results of the beam polarisation measurements are presented.