Lamb-shift Polarized Ion Source at UTTAC

Abstract

The Lamb-shift polarized ion source (PIS) was installed as one of the ion sources for the 12UD Pelletron tandem accelerator at the University of Tsukuba Tandem Accelerator Complex (UTTAC) in 1976. The PIS makes it possible to produce highly polarized negative proton and deuteron beams. However, the Great East Japan Earthquake on 11 March 2011 seriously damaged not only the accelerator but also the PIS. Following the disaster, it was decided that the PIS should be reconstructed and used as the ion source for the newly designed 6 MV tandem accelerator. Main components including the duoplasmatron chamber and spin filter were reused, while other components including the accelerator tubes and some beam ducts were newly produced. After the reconstruction of the PIS, we attempted to generate polarized beams and measure the polarization. Recently, we attempted to produce unstable nuclei with the polarized proton beam for measurements of nuclear moments of unstable nuclei.