A multi-milliampere polarized and unpolarized negative ion source for IUCF

Abstract

The pulsed polarized negative ion source (CIPIOS) for the Indiana University Cooler synchrotron produces multi-milliampere beams for injection into the Cooler Injector Synchrotron (CIS). In normal operation, the unpolarized beam intensity at the source has exceeded 30mA peak and for polarized H -and D -beams over 1.5mA peak. The FWHM of the beam pulse is 150µs, the emittance for 90% of the beam is less than 1.5Β-mm-mr normalized and the nominal polarization is 80% or greater for both beams. At these peak intensities, the source operates between 0.8Hz and 2Hz. At greater repetition rates, the peak polarized beam intensity decreases slowly.

Source of polarized ions and polarized beams at the NUCLOTRON

“…The sextupole magnet parameters are presented in [5]. The atomic beam passes through the sextupole magnets where atoms in the spin states with m j = 1/2 are focused and the ones in the spin state with m j = -1/2 are defocused.…”

“…For hydrogen atoms alternate turning on of the WFT (1  3) and the SFT (2  4) will lead theoretical values of proton vector polarization of -1 or +1, respectively. We have used MFT, WFT and SFT for polarized deuterium that will provide deuteron vector polarization between +1 and -1 and tensor polarization between +1 and -2 [5,6]. Many other deuteron polarization states can be produced by using different combinations of the HFT.…”

“…Many other deuteron polarization states can be produced by using different combinations of the HFT. The sextupole magnets and the HFT units were parts of the CIPIOS designed at IUCF [5].…”

“…The SPI is an atomic beam-type polarized ion source with a charge-exchange plasma ionizer and a storage cell in the ionization region [2][3][4]. Some parts of the polarized ion source CIPIOS from IUCF [5] are used in the project.…”

Development of polarized ion source for the JINR accelerator complex

“…For hydrogen atoms alternate turning on of WFT (1  3) and SFT (2  4) will lead to switching between theoretical values of proton vector polarization -1 and +1. For polarized deuterium use of MFT, WFT and SFT will allow switching deuteron vector polarization between +1 and -1 and tensor polarization between +1 and -2 [5,6].…”