Conceptual Design of a Polarized 3He Target for the CLAS12 Spectrometer

Abstract

We present a conceptual design for a polarized ${}^3$He target for Jefferson Lab's CLAS12 spectrometer in its standard configuration. This two-cell target will take advantage of advancements in optical pumping techniques at high magnetic field to create 60\% longitudinally polarized ${}^3$He gas in a pumping cell inside the CLAS12 5 T solenoid. By transferring this gas to a 20 cm long, 5 K target cell, a target thickness of $3\times 10^{21}$ ${}^3$He/cm${}^2$ will be produced, reaching the detector's specified maximum luminosity with a beam current of 2.5 $\hat{I}¼A$.