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Development and Quality Control of PMT Modules for the Large-Sized Telescopes of the Cherenkov Telescope Array Observatory

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arxiv 2502.02045 v1 pith:EJPVOL25 submitted 2025-02-04 astro-ph.IM physics.ins-det

T. Saito , M. Takahashi , Y. Inome , H. Abe , M. Artero , O. Blanch , J. Becerra González , S. Fukami
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D. Hadasch Y. Hanabata Y. Hattori J. Herrera Llorente K. Ishio H. Iwasaki H. Katagiri K. Kawamura D. Kerszberg S. Kimura T. Kiyomoto T. Kojima Y. Konno Y. Kobayashi S. Koyama H. Kubo J. Kushida A. López-Oramas S. Masuda S. Matsuoka D. Mazin D. Nakajima T. Nakamori T. Nagayoshi D. Ninci K. Nishijima G. Nishiyama Y. Nogami S. Nozaki M. Ogino H. Ohoka T. Oka S. Ono A. Okumura R. Orito A. Rugliancich S. Sakurai N. Sasaki Y. Sunada M. Suzuki K. Tamura J. Takeda Y. Terada M. Teshima F. Tokanai Y. Tomono S. Tsujimoto Y. Tsukamoto Y. Umetsu T. Yamamoto T. Yoshida
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classification astro-ph.IMphysics.ins-det
keywords modulesboardcontrolmodulearraycherenkovctaohigh-performance
verification ladder T0 review T1 audit T2 compute T3 formal
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The camera of the Large-Sized Telescopes (LSTs) of the Cherenkov Telescope Array Observatory (CTAO) consists of 1855 pixels that are grouped into 265 high-performance photomultiplier tube (PMT) modules. Each module comprises a seven-light-guide plate, seven PMT units, a slow control board, and a readout board with a trigger board. %In this paper we describe The requirements for the PMT modules include various aspects, such as photon detection efficiency, dynamic range, buffer depth, and test pulse functionality. We have developed a high-performance PMT module that fulfills all these requirements. Mass-production and quality control (QC) of modules for all four LSTs of the northern CTAO have been completed. Here we report on the technical details of each element of the module and its performance, together with the methods and results of QC measurements.

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