Operation of a new Longitudinally Polarized Solid Nuclear Target for experiments with CLAS12 at Jefferson Lab.

A large experimental program (dubbed "Run Group C”) to measure single- and double-spin observables in electron-proton and electron-deuteron scattering has recently been completed in Jefferson Lab’s Hall B. The experiments measured inclusive spin structure functions and spin observables in exclusive and semi-inclusive scattering using the 11 GeV, highly polarized electron beam scattering off a new, custom-built polarized target integrated into the CLAS12 spectrometer. Our report will cover the entire polarized target setup, operation, and its performance with different polarizable and unpolarizable materials.