A Concept for Polarized $^3$He Targets for High Luminosity Scattering Experiments in High Magnetic Field Environments

TL;DR

This paper proposes a novel polarized $^3$He target design for high luminosity scattering experiments in strong magnetic fields, utilizing advanced optical pumping to achieve high polarization and density.

Contribution

It introduces a two-cell polarized $^3$He target concept optimized for high magnetic fields and high luminosity experiments, with detailed design considerations.

Findings

Achieves 60% longitudinal polarization of $^3$He gas.

Design enables high-density targets suitable for high luminosity.

Plans for implementation in Jefferson Lab's CLAS12 detector.

Abstract

We present the conceptual design of a polarized $^3$He target to be used for high luminosity scattering experiments within high magnetic field environments. 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 within a uniform magnetic field above 1 T. By transferring the polarized gas to cryogenic target cell, the gas density is increased to create a target thickness suitable for high luminosity applications. We discuss the general design of this scheme, and plans for its application in Jefferson Lab's CLAS12 detector.