  GRAMS (Gamma-Ray and AntiMatter Survey) is a novel project that can
simultaneously target both astrophysical observations with MeV gamma rays and
an indirect dark matter search with antimatter. The GRAMS instrument is
designed with a cost-effective, large-scale LArTPC (Liquid Argon Time
Projection Chamber) detector surrounded by plastic scintillators. The
astrophysical observations at MeV energies have not yet been well-explored (the
so-called "MeV-gap") and GRAMS can improve the sensitivity by more than an
order of magnitude compared to previous experiments. While primarily focusing
on MeV gamma-ray observations, GRAMS is also optimized for cosmic ray
antimatter surveys to indirectly search for dark matter. In particular,
low-energy antideuterons will provide an essentially background-free dark
matter signature. GRAMS will be a next generation experiment beyond the current
GAPS (General AntiParticle Spectrometer) project for antimatter survey.
