Cryostat for a Polarized Target

SeaQuest with a Transversely Polarized Target (E1039)

We have constructed a state-of-the-art, high luminosity polarized proton and deuteron target and propose to measure the Sivers asymmetry for the ū and d̄ sea quarks in the nucleon for four different Bjorken xB bins in the range 0.1 < xB < 0.5, using the Drell-Yan process at SeaQuest. We will: i) perform the first measurement of the Sivers asymmetry in Drell-Yan scattering for sea quarks; ii) det...

3 Dynamics of Very Light Nuclei 3 . 1 Polarized - Beam and Polarized - Target Reactions 3 . 1 . 1 A Polarized Solid 3 He Target for Neutron - Transmission Experi - ments

In the past year we have completed measurements of polarized neutron–polarized He scattering in the few MeV region. Measurements of the total cross-section differences ∆σT and ∆σL have been obtained for neutrons with incident energies 1-10 MeV. The results are sensitive to the excited state structure of the alpha particle and may be compared to phase-shift predictions based on a number of analy...

Cryostat System for Spacecraft Materials Testing

Development of Recondensing Cryostat for PAMELA

PAMELA (Particle Accelerator for MEdicaL Applications) is a design study of a novel accelerator for cancer therapy using protons and carbon ions. The accelerator utilizes the nonscaling Fixed Field Alternating Gradient (FFAG) principle and features superconducting combined-function magnets with dipole, quadrupole, sextupole and octupole field components for steering the ion beam. The proton rin...

Radiation Damage in Polarized Target Materials*

We examine some of the parameters which influence the decay of the polarization of polarized targets in an intense proton beam. We find that the usual characteristic flux for the polarization to drop to 1/e of its initial value does not provide a sufficient criterion to specify the radiation resistance of target materials. We give a more detailed method of evaluation including an empirical form...