SPACIROC: A Front-End Readout ASIC for JEM-EUSO Cosmic Ray Observatory

• Published in: Physics procedia Vol. 37; pp. 1600 - 1607
• Main Authors: Ahmad, Salleh, Barrillon, Pierre, Blin-Bondil, Sylvie, Dagoret-Campagne, Sylvie, Taille, Christophe Dela, Dulucq, Frederic, Martin-Chassard, Gisele, Kawasaki, Yoshiya, Miyamoto, Hiroko, Ikeda, Hirokazu, Iguchi, Tatsunari, Kajino, Fumiyoshi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2012
• Subjects: ASIC; Front-End Electronics; Rad-Hard; Front-End Electronics; ASIC; Rad-Hard
• ISSN: 1875-3892; 1875-3892
• DOI: 10.1016/j.phpro.2012.02.482

The SPACIROC ASIC is designed for the JEM-EUSO fluorescence imaging telescope onboard of the International Space Station. Its goal is the detection of Giant Air Shower above a few 10^19eV, developing at a distance of about 400km, downward in the troposphere. From such distance, most of the time, the number of the photons expected in the pixels is very weak, ranging from a few units to a few tens. For such running conditions, we propose a low-power, rad-hard ASIC which is intended for reading out a 64-channel Multi-Anode Photomultiplier. The two main features of this ASIC are the photon counting mode for each input and the charge-to-time (Q-to-T) conversions for the multiplexed channels. In the photon counting mode, the 100% triggering efficiency is achieved for 50 fC input charges. For the Q-to-T converter, the ASIC requires a minimum input of 2 pC. The working conditions of JEM-EUSO require the ASIC to have a low power dissipation which is around 1mW/channel. The design of SPACIROC and the test results are presented in this paper. SPACIROC is a result of the collaboration between OMEGA/LAL-Orsay, France, RIKEN, ISAS/JAXA and Konan University, Japan on behalf of the JEM-EUSO consortium.