Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 22: Experimentelle Techniken der Astroteilchenphysik 1

T 22.5: Vortrag

Montag, 27. März 2017, 17:50–18:05, S 9

First evaluation of the prototype 19-modules camera for the Large Size Telescope of the CTA — •Tsutomu Nagayoshi for the CTA-Japan collaboration — Saitama Univ., Saitama-shi, Japan — Max-Planck-Inst. fuer Phys., Munich, Germany

The Cherenkov Telescope Array (CTA) represents the next generation of ground based observatory for very high energy gamma rays. This observatory will be an array of about 100 Cherenkov telescopes of three different sizes, will be ten times more sensitive than the current generation telescopes, and will expand the energy coverage to be from 20 GeV to more than 300 TeV. The Large Size Telescope (LST), which has 23 m diameter mirror dish, dominates the sensitivity of CTA below 200 GeV, which is the energy range with the largest discovery potential, including the detection of many pulsars or distant (z>1) blazars or GRBs. The LST camera consists of 265 photo sensor modules, each of them containing seven photomultiplier tubes (PMTs), a slow control board, a readout board, and a 2-level trigger logic. The PMTs (R11920, Hamamatsu Photonics) have 1.5 inch size photo-cathode and 8 stages of dynodes. In addition, for each PMT, Cockcroft*Walton type DC-DC converter and a preamplifier ASIC are assembled. We carried out the quality control of all PMTs, and constructed the first prototype mini-camera consisting of 19 PMT modules. In this talk I will present the results of the quality control and the first evaluation of the integration tests of the 19-modules camera prototype.