D- Charge Exchange Ionizer for the JINR Polarized Ion Source POLARIS

The spin physics program is an important part of the LHE JINR scientific program. An intensive study of polarization phenomena was carried out at the Dubna 4.5 Gev/nucl. synchrophasotron, using cryogenic source of polarized deuterons (↑D+) POLARIS. There is a proposal to make a polarized deuteron beam in the new accelerator Nuclotron to continue the spin physics experiments. The Nuclotron has a short one-turn injection (8 μs) of positive ions at present. To increase the intensity of the accelerated polarized beam up to 0.7-1*1010↑d/pulse a multyturn charge exchange injection of negative ions (20-30 turns) should be applied. It is realized by injection into the accelerator of ↑D- ions and stripping them inside the ring. The source POLARIS is reconstructed into the ↑D- source now. The existing ↑D+ cryogenic charge exchange ionizer modified into the ↑D- ionizer. The 10 mA H- plasma beam have been measured at a test bench. The tests of the ionizer are in progress