We present GammaTPC, a transformative 0.1-10 MeV γ-ray instrument concept featuring a tracker using a liquid argon time projection chamber (LAr TPC) technology with the novel GAMPix high spatial resolution and ultra low power charge readout. These enable an economical instrument with unprecedented effective area and sensitivity. We discuss the design and technology in some detail, including how a LAr TPC can be staged in space. Finally, we present a first study of the sensitivity of the instrument in the Compton regime using a new framework for analyzing Compton telescope data.
@article{arxiv.2502.14841,
title = {The GammaTPC Gamma-Ray Telescope Concept},
author = {Tom Shutt and Bahrudin Trbalic and Eric Charles and Niccolo Di Lalla and Oliver Hitchcock and Sam Jett and Ryan Linehan and Steffen Luitz and Greg Madejski and Aldo Peña-Perez and Yun-Tse Tsai},
journal= {arXiv preprint arXiv:2502.14841},
year = {2025}
}