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Deep sea tests of a prototype of the KM3NeT digital optical module

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European Physical Journal C Volume 74, Issue 9, 1 September 2014, 8p Deep sea tests of a prototype of the KM3NeT digital optical module: KM3NeT Collaboration (Article) Adrián-Martínez, S.a, Ageron, M.b, Aharonian, F.c, Aiello, S.d, Albert, A.e, Ameli, F.f, Anassontzis, E.G.g, Anghinolfi, M.h, Anton, G.i, Anvar, S.j, Ardid, M.a, de Asmundis, R.k, Balasi, K.l, Band, H.m, Barbarino, G.kn, Barbarito, E.o, Barbato, F.kn, Baret, B.p, Baron, S.p, Belias, A.lq, Berbee, E.m, van den Berg, A.M.r, Berkien, A.m, Bertin, V.b, Beurthey, S.b, van Beveren, V.m, Beverini, N.st, Biagi, S.uv, Bianucci, S.t, Billault, M.b, Birbas, A.w, Boer Rookhuizen, H.m, Bormuth, R.mx, Bouché, V.fy, Bouhadef, B.t, Bourlis, G.w, Bouwhuis, M.m, Bozza, C.nz, Bruijn, R.maa, Brunner, J.b, Cacopardo, G.ab, Caillat, L.b, Calamai, M.t, Calvo, D.ad, Capone, A.y, Caramete, L.ae, Caruso, F.ab, Cecchini, S.uv, Ceres, A.o, Cereseto, R.h, Champion, C.p, Château, F.j, Chiarusi, T.u, Christopoulou, B.w, Circella, M.o, Classen, L.i, Cocimano, R.ab, Colonges, S.p, Coniglione, R.ab, Cosquer, A.b, Costa, M.ab, Coyle, P.b, Creusot, A.p, Curtil, C.b, Cuttone, G.ab, D’Amato, C.ab, D’Amico, A.ab, De Bonis, G.f, De Rosa, G.kn, Deniskina, N.k, Destelle, J.-J.b, Distefano, C.ab, Donzaud, C.pac, Dornic, D.b, Dorosti-Hasankiadeh, Q.r, Drakopoulou, E.l, Drouhin, D.e, Drury, L.c, Durand, D.j, Eberl, T.i, Eleftheriadis, C.af, Elsaesser, D.ag, Enzenhöfer, A.i, Fermani, P.fy, Fusco, L.A.uv, Gajana, D.m, Gal, T.i, Galatà, S.p, Gallo, F.b, Garufi, F.kn, Gebyehu, M.m, Giordano, V.d, Gizani, N.w, Gracia Ruiz, R.p, Graf, K.i, Grasso, R.ab, Grella, G.nz, Grmek, A.ab, Habel, R.ah, van Haren, H.ai, Heid, T.i, Heijboer, A.m, Heine, E.m, Henry, S.b, Hernández-Rey, J.J.ad, Herold, B.i, Hevinga, M.A.r, van der Hoek, M.m, Hofestädt, J.i, Hogenbirk, J.m, Hugon, C.h, Hößl, J.i, Imbesi, M.ab, James, C.i, Jansweijer, P.m, Jochum, J.aj, de Jong, M.mx, Kadler, M.ag, Kalekin, O.i, Kappes, A.i, Kappos, E.gl, Katz, U.i, Kavatsyuk, O.r, Keller, P.b, Kieft, G.m, Koffeman, E.maa, Kok, H.m, Kooijman, P.maaak , Koopstra, J.m, Korporaal, A.m, Kouchner, A.p, Koutsoukos, S.q, Kreykenbohm, I.al, Kulikovskiy, V.h, Lahmann, R.i, Lamare, P.b, Larosa, G.ab, Lattuada, D.ab, Le Provost, H.j, Leisos, A.w, Lenis, D.w, Leonora, E.d, Lindsey Clark, M.p, Liolios, A.af, Llorens Alvarez, C.D.a, Löhner, H.r, Lo Presti, D.dam, Louis, F.j, Maccioni, E.s, Mannheim, K.ag, Manolopoulos, K.gl, Margiotta, A.uv, Mariş, O.ae, Markou, C.l, Martínez-Mora, J.A.ad, Martini, A.ah, Masullo, R.fy, Michael, T.m, Migliozzi, P.k, Migneco, E.ab, Miraglia, A.ab, Mollo, C.k, Mongelli, M.o, Morganti, M.t, Mos, S.m, Moudden, Y.j, Musico, P.h, Musumeci, M.ab, Nicolaou, C.an, Nicolau, C.A.f, Orlando, A.ab, Orzelli, A.h, Papageorgiou, K.ao, Papaikonomou, A.lw, Papaleo, R.ab, Păvălaş, G.E.ae, Peek, H.m, Pellegrino, C.ab, Pellegriti, M.G.ab, Perrina, C.fy, Petridou, C.af, Piattelli, P.ab, Pikounis, K.l, Popa, V.ae, Pradier, T.ap, Priede, M.aq, Pühlhofer, G.aj, Pulvirenti, S.ab, Racca, C.e, Raffaelli, F.t, Randazzo, N.d, Rapidis, P.A.lq, Razis, P.an, Real, D.ad, Resvanis, L.gq, Reubelt, J.i, Riccobene, G.ab, Rovelli, A.ab, Royon, J.b, Saldaña, M.a, Samtleben, D.F.E.mx, Sanguineti, M.ar, Santangelo, A.aj, Sapienza, P.ab, Savvidis, I.af, Schmelling, J.m, Schnabel, J.i, Sedita, M.ab, Seitz, T.i, Sgura, I.o, Simeone, F.f, Siotis, I.l, Sipala, V.d, Solazzo, M.b, Spitaleri, A.ab, Spurio, M.uv, Stavropoulos, G.l, Steijger, J.m, Stolarczyk, T.as, Stransky, D.i, Taiuti, M.har, Terreni, G.t, Tézier, D.b, Théraube, S.b, Thompson, L.F.at, Timmer, P.m, Trapierakis, H.I.lq, Trasatti, L.ap, Trovato, A.ab, Tselengidou, M.i, Tsirigotis, A.w, Tzamarias, S.w, Tzamariudaki, E.l, Vallage, B.pas, Van Elewyck, V.p, Vermeulen, J.m, Vernin, P.as, Viola, S.ab, Vivolo, D.kn, Werneke, P.m, Wiggers, L.m, Wilms, J.al, de Wolf, E.maa, van Wooning, R.H.L.r, Yatkin, K.b, Zachariadou, K.au, Zonca, E.j, Zornoza, J.D.ad, Zúñiga, J.ad, Zwart, A.m View additional authors a Instituto de Investigación para la Gestión Integrada de las Zonas Costeras, Universitat Politècnica de València, Gandia, Spain b CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France c DIAS, Dublin, Ireland View additional affiliations View references (22) Abstract The first prototype of a photo-detection unit of the future KM3NeT neutrino telescope has been deployed in the deep waters of the Mediterranean Sea. This digital optical module has a novel design with a very large photocathode area segmented by the use of 31 three inch photomultiplier tubes. It has been integrated in the ANTARES detector for in-situ testing and validation. This paper reports on the first months of data taking and rate measurements. The analysis results highlight the capabilities of the new module design in terms of background suppression and signal recognition. The directionality of the optical module enables the recognition of multiple Cherenkov photons from the same40 K decay and the localisation of bioluminescent activity in the neighbourhood. The single unit can cleanly identify atmospheric muons and provide sensitivity to the muon arrival directions