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19 April 2024 |
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Improved sensitivity of H.E.S.S.-II through the fifth telescope focus system | | F. Krayzel
; G. Maurin
; L. Brunetti
; J.-M. Dubois
; A. Fiasson
; L. Journet
; G. Lamanna
; T. Leflour
; B. Lieunard
; I. Monteiro
; S. Rosier-Lees
; H.E.S.S. Collaboration
; | | Date: |
24 Jul 2013 | | Abstract: | The Imaging Atmospheric Cherenkov Telescope (IACT) works by imaging the very
short flash of Cherenkov radiation generated by the cascade of relativistic
charged particles produced when a TeV gamma ray strikes the atmosphere. This
energetic air shower is initiated at an altitude of 10-30 km depending on the
energy and the arrival direction of the primary gamma ray. Whether the best
image of the shower is obtained by focusing the telescope at infinity and
measuring the Cherenkov photon angles or focusing on the central region of the
shower is a not obvious question. This is particularly true for large size IACT
for which the depth of the field is much smaller. We address this issue in
particular with the fifth telescope (CT5) of the High Energy Stereoscopic
System (H.E.S.S.); a 28 m dish large size telescope recently entered in
operation and sensitive to an energy threshold of tens of GeVs. CT5 is equipped
with a focus system, its working principle and the expected effect of focusing
depth on the telescope sensitivity at low energies (50-200 GeV) is discussed. | | Source: | arXiv, 1307.6461 | | Services: | Forum | Review | PDF | Favorites | |
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