Search

Progress on the Michigan ultra-cold proton-spin-polarized atomic-hydrogen Jet target is presented. We describe the present status of the Jet and some beam test results. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

We recently stored a 1.85 GeV/c vertically polarized deuteron beam in the COSY Ring in Jülich; we then spin-flipped it by ramping a new air-core rf dipole’s frequency through an rf-induced spin resonance to manipulate the polarization direction of the deuteron beam. We first experimentally determined the resonance’s frequency and set the dipole’s rf voltage to its maximum; then we varied its frequency ramp time and frequency range. We used the EDDA detector to measure the vector and tensor polarization asymmetries. We have not yet extracted the deuteron’s tensor polarization spin-flip parameters from the measured data, since our short run did not provide adequate tensor analyzing-power data at 1.85 GeV/c. However, with a 100 Hz frequency ramp and our longest ramp time of 400 s, the deuterons’ vector polarization spin-flip efficiency was 48±1%. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]

The University of Michigan Solid Polarized Proton Target (PPT) was built in the late 1980’s; it uses irradiated NH3 at 5 T and 1 K. It was used in a 1990 experiment in a 24 GeV intense proton beam at the Brookhaven AGS, where its average polarization was about 85%. It was recently upgraded for the 70 GeV SPIN@U-70 experiment at IHEP-Protvino in Russia. Improvements were made to its superconducting magnet, its refrigerator, and its NMR and microwave systems. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]