Exploring mesonic content of the nucleon and meson structure with 22 GeV JLab

The tagged deep inelastic scattering (TDIS) experiment at JLab will probe the elusive mesonic content of the nucleon and access the meson structure function via the Sullivan process. Being a pioneering experiment it will cover a rather limited kinematic region with the 11 GeV beam. The proposed upgrade of the JLab beam energy to 22 GeV will allow a dramatically larger kinematic coverage. It will also become feasible to measure semi-inclusive deep inelastic scattering (SIDIS) off the pion in proton to pion fluctuations. Further, by extending these measurements on other light nuclei such as ³He and ⁴He it may be possible to study the long sought after ``nuclear pions''. This talk will explore all of these possibilities that will open up at a 22 GeV JLab.