Contribution Poster (A0 portrait)
High-energy analysis optimisation for imaging atmospheric Cherenkov telescopes beyond 10 TeV
The High Energy Stereoscopic System (H.E.S.S.) is an array of Cherenkov telescopes in Namibia and operates in the energy range from a few tens of GeV to more than 50 TeV. Most of the very-high-energy sources visible with H.E.S.S. emit gamma rays with energies up to tens of TeV. Nominal analysis methods, however, are optimised for the TeV energy range and achieve the best sensitivity at $\sim$1 TeV. For higher energies, existing systems are mainly limited by gamma-ray statistics. The aim of the work presented here is to improve the sensitivity above 10 TeV by optimising analysis techniques and selection tools for the highest energies. Typically, events only within $\sim$2.5 deg offset are accepted in the standard H.E.S.S. analysis (physical field of view of the cameras). Extending this range up to $\sim$4.5 deg offset would lead to an increase of the effective field of view and photon statistics, and as a result, to an improvement of the sensitivity in the high-energy domain. An improved method that is capable of reconstructing events with offsets up to $\sim$4.5 deg will be presented in this contribution.