Development of a Transversely Polarized Hydrogen-Deuteride (HD) Target for High-Energy Electron-Beam Experiments

With the completion of the 12 GeV upgrade to the accelerator at Jefferson Lab, several high-rated experiments have been approved with the highest scientific rating by the JLab PAC for Hall-B. These experiments will study the spin and flavor dependence of transverse space and momentum generalized parton distributions within the nucleon. These experiments require transverse target polarization, which is challenging since the holding field tends to bend the beam into the detector. The polarized hydrogen-deuteride (HD) target is a frozen-spin solid target that has been successfully used with photon beams and is now under study as a potential electron target. Target performance with electrons will be tested and developed at a low energy (10 MeV) Upgraded Injector Test Facility (UITF) at Jefferson Lab, which is nearing completion. This talk will describe the new designs used to optimize heat removal from a polarized HD cell, as well as the testing program with charged particles at the UITF.