A high-pressure polarized He-3 gas target for the High Intensity Gamma Source (HI gamma S) facility at Duke Free Electron Laser Laboratory

作者：Kramer Kevin; Zong Xing^*; Lu Rongchun; Dutta Dipangkar; Gao Haiyan; Qian Xin; Ye Qiang; Zhu Xiaofeng; Averett Todd; Fuchs Sabine

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2007, 582(2): 318-325.

DOI：10.1016/j.nima.2007.08.243

• He-3 gas target
• polarization
• SEOP
• NMR

A new polarized He-3 target has been developed for nuclear physics experiments utilizing the High Intensity Gamma Source (HI gamma S) at the Duke Free Electron Laser Laboratory (DFELL). This target is designed for a broad program of physics employing high intensity polarized photons and a polarized He-3 target as an effective polarized neutron target. We report the performance of this target based on the technique of spin-exchange optical pumping (SEOP). Due to the significantly larger photon beam size at the HI gamma S facility than that of a typical electron beam at electron accelerator laboratories, the HI gamma S He-3 target contains a larger number of He-3 nuclei than any polarized He-3 targets reported previously. A target polarization on the order of 33-46% has been achieved from both a regular He-3-Rubidium (Rb) target and a hybrid target which contains a mixture of Rb and potassium. The target polarization has been determined within 3% using both the Electron Paramagnetic Resonance (EPR) technique and the NMR-AFP (Adiabatic Fast Passage) technique.

• 出版日期2007-11-21
• 单位兰州大学