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Andes Large-area PArticle detector for Cosmic-ray physics and Astronomy(ALPACA) is an international experiment that applies southern very-high-energy(VHE) gamma-ray astronomy to determine the origin of cosmic rays around theknee energy region ($10^{15}\, {\rm eV} - 10^{16}\, {\rm eV}$). The experimentconsists of an air shower (AS) array with a surface of $83, 000\, {\rm m}^2$and an underground water Cherenkov muon detector (MD) array covering $5, 400\,{\rm m}^2$. The experimental site is at the Mt. Chacaltaya plateau in La Paz,Bolivia, with an altitude of $4, 740\, {\rm m}$ corresponding to $572\, {\rmg}/{\rm cm}^2$ atmospheric thickness. As the prototype experiment of ALPACA,the ALPAQUITA experiment aims to begin data acquisition in late 2021. TheALPAQUITA array consists of a smaller AS array ($18, 450\, {\rm m}^2$) andunderground MD ($900\, {\rm m}^2$), which are now under construction.ALPAQUITA's sensitivity to gamma-ray sources is evaluated with Monte Carlosimulations. The simulation finds that five gamma-ray sources observed byH.E.S.S. and HAWC experiments will be detected by ALPAQUITA beyond 10 TeV andone out of these five - HESS J1702-420A - above 300 TeV in one calendar yearobservation. The latter finding means that scientific discussions can be madeon the emission mechanism of gamma rays beyond 100 TeV from southern sources onthe basis of the observational results of this prototype experiment.

Detectability of southern gamma-ray sources beyond 100 TeV with ALPAQUITA, the prototype experiment of ALPACA