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13 results on '"Leismüller, K."'

1. The Pacific Ocean Neutrino Experiment

Author

Agostini, M., Böhmer, M., Bosma, J., Clark, K., Danninger, M., Fruck, C., Gernhäuser, R., Gärtner, A., Grant, D., Henningsen, F., Holzapfel, K., Huber, M., Jenkyns, R., Krauss, C. B., Krings, K., Kopper, C., Leismüller, K., Leys, S., Macoun, P., Meighen-Berger, S., Michel, J., Moore, R. W., Morley, M., Padovani, P., Pollmann, T., Papp, L., Pirenne, B., Qiu, C., Rea, I. C., Resconi, E., Round, A., Ruskey, A., Spannfellner, C., Traxler, M., Turcati, A., and Yanez, J. P.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract

The Pacific Ocean Neutrino Experiment (P-ONE) is a new initiative with a vision towards constructing a multi-cubic kilometre neutrino telescope, to expand our observable window of the Universe to highest energies, installed within the deep Pacific Ocean underwater infrastructure of Ocean Networks Canada., Comment: 17 pages, 2 Figures, submitted to Nature Astronomy

Published
2020
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2. STRAW-b (STRings for Absorption length in Water-b): the second pathfinder mission for the Pacific Ocean Neutrino Experiment

Author

Holzapfel, K., primary, Spannfellner, C., additional, Aghaei, O., additional, Baron, A., additional, Bedard, J., additional, Böhmer, M., additional, Bosma, J., additional, Deis, N., additional, Fink, C., additional, Fruck, C., additional, Gärtner, A., additional, Gernhäuser, R., additional, Henningsen, F., additional, Hotte, R., additional, Jenkyns, R., additional, Karl, M., additional, Khera, Na., additional, Khera, Ni., additional, Kulin, I., additional, Lam, A., additional, Lavallee, T., additional, Leismüller, K., additional, Papp, L., additional, Pirenne, B., additional, Price, E., additional, Qiu, T., additional, Rea, I.C., additional, Resconi, E., additional, Round, A., additional, Rott, C., additional, Ruskey, A., additional, Ruohan, L., additional, Sasaki, K., additional, Tradewell, M., additional, Traxler, M., additional, Vivolo, D., additional, Wagner, S., additional, Winter, E.L., additional, and Wolf, M., additional

Published
2024
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3. STRAW (STRings for Absorption length in Water): pathfinder for a neutrino telescope in the deep Pacific Ocean

Author

Boehmer, M., Bosma, J., Brussow, D., Farmer, L., Fruck, C., Gernhäuser, R., Gärtner, A., Grant, D., Henningsen, F., Hiller, S., Hoch, M., Holzapfel, K., Jenkyns, R., Khera, Na., Khera, Ni., Krings, K., Kopper, C., Kulin, I., Leismüller, K., Little, J., Macoun, P., Michel, J., Morley, M., Papp, L., Pirenne, B., Qiu, C., Rea, I. C., Resconi, E., Round, A., Ruskey, A., Spannfellner, C., and Traxler, M.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

We report about the design and the initial performances of the pathfinder mission for a possible large scale neutrino telescope named "STRings for Absorption length in Water" (STRAW). In June 2018 STRAW has been deployed at the Cascadia Basin site operated by Ocean Network Canada and has been collecting data since then. At a depth of about 2600 meters, the two STRAW 120 meters tall mooring lines are instrumented by three "Precision Optical Calibration Modules" (POCAM) and five Digital Optical Sensors (sDOM). We describe the instrumentation deployed and first light in the Pacific Ocean., Comment: Text updated, again

Published
2018
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4. The prototype detection unit of the KM3NeT detector

Author

KM3NeT Collaboration, Adrián-Martínez, S., Ageron, M., Aharonian, F., Aiello, S., Albert, A., Ameli, F., Anassontzis, E. G., Androulakis, G. C., Anghinolfi, M., Anton, G., Anvar, S., Ardid, M., Avgitas, T., Balasi, K., Band, H., Barbarino, G., Barbarito, E., Barbato, F., Baret, B., Baron, S., Barrios, J., Belias, A., Berbee, E., Berg, A. M. van den, Berkien, A., Bertin, V., Beurthey, S., van Beveren, V., Beverini, N., Biagi, S., Biagioni, A., Bianucci, S., Billault, M., Birbas, A., Rookhuizen, H. Boer, Bormuth, R., Bouché, V., Bouhadef, B., Bourlis, G., Boutonnet, C., Bouwhuis, M., Bozza, C., Bruijn, R., Brunner, J., Cacopardo, G., Caillat, L., Calamai, M., Calvo, D., Capone, A., Caramete, L., Caruso, F., Cecchini, S., Ceres, A., Cereseto, R., Champion, C., Château, F., Chiarusi, T., Christopoulou, B., Circella, M., Classen, L., Cocimano, R., Coleiro, A., Colonges, S., Coniglione, R., Cosquer, A., Costa, M., Coyle, P., Creusot, A., Cuttone, G., D'Amato, C., D'Amico, A., De Bonis, G., De Rosa, G., Deniskina, N., Destelle, J. -J., Distefano, C., Di Capua, F., Donzaud, C., Dornic, D., Dorosti-Hasankiadeh, Q., Drakopoulou, E., Drouhin, D., Drury, L., Durand, D., Eberl, T., Elsaesser, D., Enzenhöfer, A., Fermani, P., Fusco, L. A., Gajanana, D., Gal, T., Galatà, S., Garufi, F., Gebyehu, M., Giordano, V., Gizani, N., GraciaRuiz, R., Graf, K., Grasso, R., Grella, G., Grmek, A., Habel, R., van Haren, H., Heid, T., Heijboer, A., Heine, E., Henry, S., Hernández-Rey, J. J., Herold, B., Hevinga, M. A., van der Hoek, M., Hofestädt, J., Hogenbirk, J., Hugon, C., Hößl, J., Imbesi, M., James, C. W., Jansweijer, P., Jochum, J., de Jong, M., Jongen, M., Kadler, M., Kalekin, O., Kappes, A., Kappos, E., Katz, U., Kavatsyuk, O., Keller, P., Kieft, G., Koffeman, E., Kok, H., Kooijman, P., Koopstra, J., Korporaal, A., Kouchner, A., Kreykenbohm, I., Kulikovskiy, V., Lahmann, R., Lamare, P., Larosa, G., Lattuada, D., Provost, H. Le, Leismüller, K. P., Leisos, A., Lenis, D., Leonora, E., LindseyClark, M., Alvarez, C. D. Llorens, Löhner, H., Lonardo, A., Loucatos, S., Louis, F., Maccioni, E., Mannheim, K., Manolopoulos, K., Margiotta, A., Mariş, O., Markou, C., Martínez-Mora, J. A., Martini, A., Masullo, R., Melis, K. W., Michael, T., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Mos, S., Moudden, Y., Musico, P., Musumeci, M., Nicolaou, C., Nicolau, C. A., Orlando, A., Orzelli, A., Papaikonomou, A., Papaleo, R., Păvălaş, G. E., Peek, H., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Pikounis, K., Popa, V., Pradier, Th., Priede, M., Pühlhofer, G., Pulvirenti, S., Racca, C., Raffaelli, F., Randazzo, N., Rapidis, P. A., Razis, P., Real, D., Resvanis, L., Reubelt, J., Riccobene, G., Rovelli, A., Saldaña, M., Samtleben, D. F. E., Sanguineti, M., Santangelo, A., Sapienza, P., Schmelling, J., Schnabel, J., Sciacca, V., Sedita, M., Seitz, T., Sgura, I., Simeone, F., Sipala, V., Spitaleri, A., Spurio, M., Stavropoulos, G., Steijger, J., Stolarczyk, T., Stransky, D., Taiuti, M., Terreni, G., Tézier, D., Théraube, S., Thompson, L. F., Timmer, P., Trasatti, L., Trovato, A., Tselengidou, M., Tsirigotis, A., Tzamarias, S., Tzamariudaki, E., Vallage, B., Van Elewyck, V., Vermeulen, J., Vernin, P., Vicini, P., Viola, S., Vivolo, D., Werneke, P., Wiggers, L., Wilms, J., de Wolf, E., van Wooning, R. H. L., Zonca, E., Zornoza, J. D., Zúñiga, J., and Zwart, A.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

A prototype detection unit of the KM3NeT deep-sea neutrino telescope has been installed at 3500m depth 80km offshore the Italian coast. KM3NeT in its final configuration will contain several hundreds of detection units. Each detection unit is a mechanical structure anchored to the sea floor, held vertical by a submerged buoy and supporting optical modules for the detection of Cherenkov light emitted by charged secondary particles emerging from neutrino interactions. This prototype string implements three optical modules with 31 photomultiplier tubes each. These optical modules were developed by the KM3NeT Collaboration to enhance the detection capability of neutrino interactions. The prototype detection unit was operated since its deployment in May 2014 until its decommissioning in July 2015. Reconstruction of the particle trajectories from the data requires a nanosecond accuracy in the time calibration. A procedure for relative time calibration of the photomultiplier tubes contained in each optical module is described. This procedure is based on the measured coincidences produced in the sea by the 40K background light and can easily be expanded to a detector with several thousands of optical modules. The time offsets between the different optical modules are obtained using LED nanobeacons mounted inside them. A set of data corresponding to 600 hours of livetime was analysed. The results show good agreement with Monte Carlo simulations of the expected optical background and the signal from atmospheric muons. An almost background-free sample of muons was selected by filtering the time correlated signals on all the three optical modules. The zenith angle of the selected muons was reconstructed with a precision of about 3{\deg}., Comment: Accepted for publication by EPJ C

Published
2015
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5. Long term monitoring of the optical background in the Capo Passero deep-sea site with the NEMO tower prototype

Author

Adrián-Martínez, S., Aiello, S., Ameli, F., Anghinolfi, M., Ardid, M., Barbarino, G., Barbarito, E., Barbato, F. C. T., Beverini, N., Biagi, S., Biagioni, A., Bouhadef, B., Bozza, C., Cacopardo, G., Calamai, M., Calí, C., Calvo, D., Capone, A., Caruso, F., Ceres, A., Chiarusi, T., Circella, M., Cocimano, R., Coniglione, R., Costa, M., Cuttone, G., D'Amato, C., D'Amico, A., De Bonis, G., De Luca, V., Deniskina, N., De Rosa, G., di Capua, F., Distefano, C., Enzenhöfer, A., Fermani, P., Ferrara, G., Flaminio, V., Fusco, L. A., Garufi, F., Giordano, V., Gmerk, A., Grasso, R., Grella, G., Hugon, C., Imbesi, M., Kulikovskiy, V., Lahmann, R., Larosa, G., Lattuada, D., Leismüller, K. P., Leonora, E., Litrico, P., Alvarez, C. D. Llorens, Lonardo, A., Longhitano, F., Presti, D. Lo, Maccioni, E., Margiotta, A., Marinelli, A., Martini, A., Masullo, R., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Musico, P., Musumeci, M., Nicolau, C. A., Orlando, A., Orzelli, A., Papaleo, R., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Pugliatti, C., Pulvirenti, S., Raffaelli, F., Randazzo, N., Real, D., Riccobene, G., Rovelli, A., Saldaña, M., Sanguineti, M., Sapienza, P., Sciacca, V., Sgura, I., Simeone, F., Sipala, V., Speziale, F., Spitaleri, A., Spurio, M., Stellacci, S. M., Taiuti, M., Terreni, G., Trasatti, L., Trovato, A., Ventura, C., Vicini, P., Viola, S., and Vivolo, D.

Subjects
Physics - Instrumentation and Detectors
Abstract

The NEMO Phase-2 tower is the first detector which was operated underwater for more than one year at the "record" depth of 3500 m. It was designed and built within the framework of the NEMO (NEutrino Mediterranean Observatory) project. The 380 m high tower was successfully installed in March 2013 80 km offshore Capo Passero (Italy). This is the first prototype operated on the site where the italian node of the KM3NeT neutrino telescope will be built. The installation and operation of the NEMO Phase-2 tower has proven the functionality of the infrastructure and the operability at 3500 m depth. A more than one year long monitoring of the deep water characteristics of the site has been also provided. In this paper the infrastructure and the tower structure and instrumentation are described. The results of long term optical background measurements are presented. The rates show stable and low baseline values, compatible with the contribution of 40K light emission, with a small percentage of light bursts due to bioluminescence. All these features confirm the stability and good optical properties of the site., Comment: 12 pages, 17 figures

Published
2015
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6. Measurement of the atmospheric muon depth intensity relation with the NEMO Phase-2 tower

Author

Aiello, S., Ameli, F., Anghinolfi, M., Barbarino, G., Barbarito, E., Barbato, F., Beverini, N., Biagi, S., Bouhadef, B., Bozza, C., Cacopardo, G., Calamai, M., Calì, C., Capone, A., Caruso, F., Ceres, A., Chiarusi, T., Circella, M., Cocimano, R., Coniglione, R., Costa, M., Cuttone, G., D'Amato, C., D'Amico, A., De Bonis, G., De Luca, V., Deniskina, N., De Rosa, G., Di Capua, F., Distefano, C., Fermani, P., Fusco, L. A., Garufi, F., Giordano, V., Gmerk, A., Grasso, R., Grella, G., Hugon, C., Imbesi, M., Kulikovskiy, V., Larosa, G., Lattuada, D., Leismueller, K. P., Leonora, E., Litrico, P., Lonardo, A., Longhitano, F., Presti, D. Lo, Maccioni, E., Margiotta, A., Martini, A., Masullo, R., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Musico, P., Musumeci, M., Nicolau, C. A., Orlando, A., Papaleo, R., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Pugliatti, C., Pulvirenti, S., Orselli, A., Raffaelli, F., Randazzo, N., Riccobene, G., Rovelli, A., Sanguineti, M., Sapienza, P., Sciacca, V., Sgura, I., Simeone, F., Sipala, V., Speziale, F., Spina, M., Spitaleri, A., Spurio, M., Stellacci, S. M., Taiuti, M., Terreni, G., Trasatti, L., Trovato, A., Ventura, C., Vicini, P., Viola, S., and Vivolo, D.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract

The results of the analysis of the data collected with the NEMO Phase-2 tower, deployed at 3500 m depth about 80 km off-shore Capo Passero (Italy), are presented. Cherenkov photons detected with the photomultipliers tubes were used to reconstruct the tracks of atmospheric muons. Their zenith-angle distribution was measured and the results compared with Monte Carlo simulations. An evaluation of the systematic effects due to uncertainties on environmental and detector parameters is also included. The associated depth intensity relation was evaluated and compared with previous measurements and theoretical predictions. With the present analysis, the muon depth intensity relation has been measured up to 13 km of water equivalent., Comment: submitted to Astroparticle Physics

Published
2014
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7. Long term monitoring of the optical background in the Capo Passero deep-sea site with the NEMO tower prototype

Author

Adrián-Martínez, S., Aiello, S., Ameli, F., Anghinolfi, M., Ardid, M., Barbarino, G., Barbarito, E., Barbato, F. C. T., Beverini, N., Biagi, S., Biagioni, A., Bouhadef, B., Bozza, C., Cacopardo, G., Calamai, M., Calì, C., Calvo, D., Capone, A., Caruso, F., Ceres, A., Chiarusi, T., Circella, M., Cocimano, R., Coniglione, R., Costa, M., Cuttone, G., D’Amato, C., D’Amico, A., De Bonis, G., De Luca, V., Deniskina, N., De Rosa, G., di Capua, F., Distefano, C., Enzenhöfer, A., Fermani, P., Ferrara, G., Flaminio, V., Fusco, L. A., Garufi, F., Giordano, V., Gmerk, A., Grasso, R., Grella, G., Hugon, C., Imbesi, M., Kulikovskiy, V., Lahmann, R., Larosa, G., Lattuada, D., Leismüller, K. P., Leonora, E., Litrico, P., Llorens Alvarez, C. D., Lonardo, A., Longhitano, F., Lo Presti, D., Maccioni, E., Margiotta, A., Marinelli, A., Martini, A., Masullo, R., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Musico, P., Musumeci, M., Nicolau, C. A., Orlando, A., Orzelli, A., Papaleo, R., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Pugliatti, C., Pulvirenti, S., Raffaelli, F., Randazzo, N., Real, D., Riccobene, G., Rovelli, A., Saldaña, M., Sanguineti, M., Sapienza, P., Sciacca, V., Sgura, I., Simeone, F., Sipala, V., Speziale, F., Spitaleri, A., Spurio, M., Stellacci, S. M., Taiuti, M., Terreni, G., Trasatti, L., Trovato, A., Ventura, C., Vicini, P., Viola, S., and Vivolo, D.

Published
2016
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8. The prototype detection unit of the KM3NeT detector: KM3NeT Collaboration

Author

Adrián-Martínez, S., Ageron, M., Aharonian, F., Aiello, S., Albert, A., Ameli, F., Anassontzis, E. G., Androulakis, G. C., Anghinolfi, M., Anton, G., Anvar, S., Ardid, M., Avgitas, T., Balasi, K., Band, H., Barbarino, G., Barbarito, E., Barbato, F., Baret, B., Baron, S., Barrios, J., Belias, A., Berbee, E., van den Berg, A. M., Berkien, A., Bertin, V., Beurthey, S., van Beveren, V., Beverini, N., Biagi, S., Biagioni, A., Bianucci, S., Billault, M., Birbas, A., Boer Rookhuizen, H., Bormuth, R., Bouché, V., Bouhadef, B., Bourlis, G., Boutonnet, C., Bouwhuis, M., Bozza, C., Bruijn, R., Brunner, J., Cacopardo, G., Caillat, L., Calamai, M., Calvo, D., Capone, A., Caramete, L., Caruso, F., Cecchini, S., Ceres, A., Cereseto, R., Champion, C., Château, F., Chiarusi, T., Christopoulou, B., Circella, M., Classen, L., Cocimano, R., Coleiro, A., Colonges, S., Coniglione, R., Cosquer, A., Costa, M., Coyle, P., Creusot, A., Cuttone, G., D’Amato, C., D’Amico, A., De Bonis, G., De Rosa, G., Deniskina, N., Destelle, J.-J., Distefano, C., Di Capua, F., Donzaud, C., Dornic, D., Dorosti-Hasankiadeh, Q., Drakopoulou, E., Drouhin, D., Drury, L., Durand, D., Eberl, T., Elsaesser, D., Enzenhöfer, A., Fermani, P., Fusco, L. A., Gajanana, D., Gal, T., Galatà, S., Garufi, F., Gebyehu, M., Giordano, V., Gizani, N., Gracia Ruiz, R., Graf, K., Grasso, R., Grella, G., Grmek, A., Habel, R., van Haren, H., Heid, T., Heijboer, A., Heine, E., Henry, S., Hernández-Rey, J. J., Herold, B., Hevinga, M. A., van der Hoek, M., Hofestädt, J., Hogenbirk, J., Hugon, C., Hößl, J., Imbesi, M., James, C. W., Jansweijer, P., Jochum, J., de Jong, M., Jongen, M., Kadler, M., Kalekin, O., Kappes, A., Kappos, E., Katz, U., Kavatsyuk, O., Keller, P., Kieft, G., Koffeman, E., Kok, H., Kooijman, P., Koopstra, J., Korporaal, A., Kouchner, A., Kreykenbohm, I., Kulikovskiy, V., Lahmann, R., Lamare, P., Larosa, G., Lattuada, D., Le Provost, H., Leismüller, K. P., Leisos, A., Lenis, D., Leonora, E., Lindsey Clark, M., Llorens Alvarez, C. D., Löhner, H., Lonardo, A., Loucatos, S., Louis, F., Maccioni, E., Mannheim, K., Manolopoulos, K., Margiotta, A., Mariş, O., Markou, C., Martínez-Mora, J. A., Martini, A., Masullo, R., Melis, K. W., Michael, T., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Mos, S., Moudden, Y., Musico, P., Musumeci, M., Nicolaou, C., Nicolau, C. A., Orlando, A., Orzelli, A., Papaikonomou, A., Papaleo, R., Păvălaş, G. E., Peek, H., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Pikounis, K., Popa, V., Pradier, Th., Priede, M., Pühlhofer, G., Pulvirenti, S., Racca, C., Raffaelli, F., Randazzo, N., Rapidis, P. A., Razis, P., Real, D., Resvanis, L., Reubelt, J., Riccobene, G., Rovelli, A., Saldaña, M., Samtleben, D. F. E., Sanguineti, M., Santangelo, A., Sapienza, P., Schmelling, J., Schnabel, J., Sciacca, V., Sedita, M., Seitz, T., Sgura, I., Simeone, F., Sipala, V., Spitaleri, A., Spurio, M., Stavropoulos, G., Steijger, J., Stolarczyk, T., Stransky, D., Taiuti, M., Terreni, G., Tézier, D., Théraube, S., Thompson, L. F., Timmer, P., Trasatti, L., Trovato, A., Tselengidou, M., Tsirigotis, A., Tzamarias, S., Tzamariudaki, E., Vallage, B., Van Elewyck, V., Vermeulen, J., Vernin, P., Vicini, P., Viola, S., Vivolo, D., Werneke, P., Wiggers, L., Wilms, J., de Wolf, E., van Wooning, R. H. L., Zonca, E., Zornoza, J. D., Zúñiga, J., and Zwart, A.

Published
2016
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9. STRAW-Strings for Absorption Length in Water Pathfinder for a Potential New Neutrino Telescope Site in the Pacific Ocean

Author

Rea, Immacolata Carmen, primary, Boehmer, M., additional, Bosma, J., additional, Fruck, C., additional, Grant, D., additional, Henningsen, F., additional, Holzapfel, K., additional, Gernhäuser, R., additional, Gärtner, A., additional, Hiller, S., additional, Jenkyns, R., additional, Krings, K., additional, Leismüller, K., additional, Michel, J., additional, Morley, M., additional, Papp, L., additional, Pirenne, B., additional, Resconi, E., additional, Round, A., additional, Spannfellner, C., additional, and Traxler, M., additional

Published
2019
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10. STRAW (STRings for Absorption length in Water): pathfinder for a neutrino telescope in the deep Pacific Ocean

Author

Boehmer, M., primary, Bosma, J., additional, Brussow, D., additional, Farmer, L., additional, Fruck, C., additional, Gernhäuser, R., additional, Gärtner, A., additional, Grant, D., additional, Henningsen, F., additional, Hiller, S., additional, Hoch, M., additional, Holzapfel, K., additional, Jenkyns, R., additional, Khera, Na., additional, Khera, Ni., additional, Krings, K., additional, Kopper, C., additional, Kulin, I., additional, Leismüller, K., additional, Little, J., additional, Macoun, P., additional, Michel, J., additional, Morley, M., additional, Papp, L., additional, Pirenne, B., additional, Qiu, C., additional, Rea, I. C., additional, Resconi, E., additional, Round, A., additional, Ruskey, A., additional, Spannfellner, C., additional, and Traxler, M., additional

Published
2019
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11. Inertial bioluminescence rhythms at the Capo Passero (KM3NeT-Italia) site, Central Mediterranean Sea

Author

Aguzzi, J, Fanelli, E., Ciuffardi, T., Schirone, A., Craig, J., Aiello, S., Ameli, F., Anghinolf, M., Barbarino, G., Barbarito, E., Beverini, N., Biagi, S., Biagioni, A., Bouhadef, B., Bozza, C., Cacopardo, G., Calamai, M., Calì, C., Capone, A., Caruso, F., Cecchini, S., Ceres, A., Chiarusi, T., Circella, M., Cocimano, R., Coniglione, R., Costa, M., Cuttone, G., D'Amato, C., D'Amico, A., De Bonis, G., De Luca, V., Deniskina, N., Distefano, C., Di Mauro, L. S., Fermani, P., Ferrara, G., Flaminio, V., Fusco, L. A., Garuf, F., Giordano, V., Gmerk, A., Grasso, R., Grella, G., Hugon, C., Imbesi, M., Kulikovskiy, Vladimir, Larosa, G., Lattuada, D., Leismuller, K. P., Leonora, E., Litrico, P., Lonardo, A., Longhitano, F., Presti, D. Lo, Maccioni, E., Margiotta, A., Marinelli, A., Martini, A., Masullo, R., Mele, R., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Musico, Paolo, Musumeci, M., Nicolau, C. A., Orlando, A., Orzelli, A., Papaleo, R., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Poma, E., Pulvirenti, S., Raffaelli, F., Randazzo, N., Riccobene, G., Rovelli, A., Sanguineti, Matteo, Sapienza, P., Sciacca, V., Sgura, I., Simeone, F., Sipala, V., Speziale, F., Spitaleri, A., Spurio, M., Stellacci, S. M., Taiuti, MAURO GINO, Terreni, G., Trasatti, L., Trovato, A., Versari, F., Vicini, P., Viola, S., Vivolo, D., Aguzzi, J, Fanelli, E, Ciuffardi, T, Schirone, A, Craig, J, Aiello, S, Ameli, F, Anghinolfi, M, Barbarino, G, Barbarito, E, Beverini, N, Biagi, S, Biagioni, A, Bouhadef, B, Bozza, C, Cacopardo, G, Calamai, M, Calì, C, Capone, A, Caruso, F, Cecchini, S, Ceres, A, Chiarusi, T, Circella, M, Cocimano, R., Coniglione, R, Costa, M, Cuttone, G, D’Amato, C, D’Amico, A, De Bonis, G, De Luca, V, Deniskina, N, Distefano, C, Di Mauro, L, Fermani, P, Ferrara, G, Flaminio, V, Fusco, L A, Garufi, F, Giordano, V, Gmerk, A, Grasso, R, Grella, G, Hugon, C, Imbesi, M, Kulikovskiy, V, Larosa, G, Lattuada, D, Leismüller, K P, Leonora, E, Litrico, P, Lonardo, A, Longhitano, F, Lo Presti, D, Maccioni, E, Margiotta, A, Marinelli, A, Martini, A, Masullo, R., Mele, R, Migliozzi, P, Migneco, E, Miraglia, A, Mollo, C M, Mongelli, M, Morganti, M, Musico, P, Musumeci, M, Nicolau, C A, Orlando, A, Orzelli, A, Papaleo, R, Pellegrino, C, Pellegriti, M G, Perrina, C, Piattelli, P, Poma, E, Pulvirenti, S, Raffaelli, F, Randazzo, N, Riccobene, G, Rovelli, A, Sanguineti, M, Sapienza, P, Sciacca, V, Sgura, I, Simeone, F, Sipala, V, Speziale, F, Spitaleri, A, Spurio, M, Stellacci, S M, Taiuti, M, Terreni, G, Trasatti, L, Trovato, A, Versari, F, Vicini, P, Viola, S, Vivolo, D, Fanelli, E., Schirone, A., Ciuffardi, T., ARAG - AREA FINANZA E PARTECIPATE, DIPARTIMENTO DI FISICA E ASTRONOMIA 'AUGUSTO RIGHI', Da definire, AREA MIN. 02 - Scienze fisiche, Aguzzi, J., Craig, J., Aiello, S., Ameli, F., Anghinolf, M., Barbarino, G., Barbarito, E., Beverini, N., Biagi, S., Biagioni, A., Bouhadef, B., Bozza, C., Cacopardo, G., Calamai, M., Cali, C., Capone, A., Caruso, F., Cecchini, S., Ceres, A., Chiarusi, T., Circella, M., Coniglione, R., Costa, M., Cuttone, G., D'Amato, C., D'Amico, A., De Bonis, G., De Luca, V., Deniskina, N., Distefano, C., Di Mauro, L. S., Fermani, P., Ferrara, G., Flaminio, V., Fusco, L. A., Garuf, F., Giordano, V., Gmerk, A., Grasso, R., Grella, G., Hugon, C., Imbesi, M., Kulikovskiy, V., Larosa, G., Lattuada, D., Leismuller, K. P., Leonora, E., Litrico, P., Lonardo, A., Longhitano, F., Presti, D. L., Maccioni, E., Margiotta, A., Marinelli, A., Martini, A., Mele, R., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Musico, P., Musumeci, M., Nicolau, C. A., Orlando, A., Orzelli, A., Papaleo, R., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Poma, E., Pulvirenti, S., Raffaelli, F., Randazzo, N., Riccobene, G., Rovelli, A., Sanguineti, M., Sapienza, P., Sciacca, V., Sgura, I., Simeone, F., Sipala, V., Speziale, F., Spitaleri, A., Spurio, M., Stellacci, S. M., Taiuti, M., Terreni, G., Trasatti, L., Trovato, A., Versari, F., Vicini, P., Viola, S., and Vivolo, D.

Subjects
0106 biological sciences, CURRENTS, Water mass, 010504 meteorology & atmospheric sciences, neutrino telescopes, Mesoscale meteorology, bioliminescence, MACROZOOPLANKTON, Biology, bioliminescence, Mediterranean sea, neutrino telescopes, 01 natural sciences, Deep sea, Article, Mediterranean sea, Bathymetry, DEEP-SEA, MARINE BIOLUMINESCENCE, NEPHROPS-NORVEGICUS, LIGHT-INTENSITY, ATLANTIC-OCEAN, PATTERNS, SYSTEM, UNDERWATER NEUTRINO TELESCOPE, 0105 earth and related environmental sciences, Multidisciplinary, Ecology, 010604 marine biology & hydrobiology, Geodesy, Light intensity, KM3NeT, Anticyclone
Abstract

13 pages, 6 figures, tables, In the deep sea, the sense of time is dependent on geophysical fluctuations, such as internal tides and atmospheric-related inertial currents, rather than day-night rhythms. Deep-sea neutrino telescopes instrumented with light detecting Photo-Multiplier Tubes (PMT) can be used to describe the synchronization of bioluminescent activity of abyssopelagic organisms with hydrodynamic cycles. PMT readings at 8 different depths (from 3069 to 3349 m) of the NEMO Phase 2 prototype, deployed offshore Capo Passero (Sicily) at the KM3NeT-Italia site, were used to characterize rhythmic bioluminescence patterns in June 2013, in response to water mass movements. We found a significant (p < 0.05) 20.5 h periodicity in the bioluminescence signal, corresponding to inertial fluctuations. Waveform and Fourier analyses of PMT data and tower orientation were carried out to identify phases (i.e. the timing of peaks) by subdividing time series on the length of detected inertial periodicity. A phase overlap between rhythms and cycles suggests a mechanical stimulation of bioluminescence, as organisms carried by currents collide with the telescope infrastructure, resulting in the emission of light. A bathymetric shift in PMT phases indicated that organisms travelled in discontinuous deep-sea undular vortices consisting of chains of inertially pulsating mesoscale cyclones/anticyclones, which to date remain poorly known

Published
2017

12. Long term monitoring of the optical background in the Capo Passero deep-sea site with the NEMO tower prototype

Author

Carmelo Pellegrino, F. Garufi, S. Pulvirenti, S. Aiello, M. Morganti, A. Spitaleri, Marco Circella, A. Enzenhöfer, Matteo Sanguineti, Giacomo Cuttone, Andrea Biagioni, Francesco Caruso, A. Gmerk, R. Masullo, Alberto Rovelli, A. Martini, Salvatore Viola, Annarita Margiotta, V. Giordano, C. D'Amato, Paolo Piattelli, M. Musumeci, L.A. Fusco, C. M. Mollo, E. Barbarito, S. Biagi, Irene Sgura, Giuseppina Larosa, D. Lattuada, M. Saldaña, Fabrizio Raffaelli, K. P. Leismüller, Mário Costa, Antonio Capone, S. Adrián-Martínez, D. Real, Giorgio Riccobene, Maurizio Spurio, F. Simeone, Alessandro Lonardo, F. Speziale, Antonio D'Amico, Nunzio Randazzo, Daniele Vivolo, M. Imbesi, C. Hugon, A. Trovato, C.A. Nicolau, D. Lo Presti, V. Sciacca, Cristiano Bozza, Nicolo' Beverini, P. Litrico, A. Miraglia, Emilio Migneco, Tommaso Chiarusi, F. C. T. Barbato, P. Migliozzi, N. Deniskina, G. De Rosa, V. Sipala, Carlo Ventura, G. De Bonis, Rosanna Cocimano, Riccardo Papaleo, Piera Sapienza, A. Orzelli, C. D. Llorens Alvarez, M. Anghinolfi, C. Pugliatti, A. Ceres, Simona Maria Stellacci, D. Calvo, V. Flaminio, Antonio Marinelli, F. Ameli, M. Mongelli, R. Coniglione, V. De Luca, F. Di Capua, Fabio Longhitano, Giovanna Ferrara, A. Orlando, Giancarlo Barbarino, B. Bouhadef, C. Distefano, M. Taiuti, Claudio Cali, V. Kulikovskiy, L. Trasatti, R. Lahmann, M. G. Pellegriti, Piero Vicini, G. Cacopardo, Miguel Ardid, Enrico Maccioni, Rosaria Grasso, E. Leonora, G. Terreni, P. Fermani, G. Grella, C. Perrina, P. Musico, M. Calamai, Adrián-Martínez, S., Aiello, S., Ameli, F., Anghinolfi, M., Ardid, M., Barbarino, G., Barbarito, E., Barbato, F.C.T., Beverini, N., Biagi, S., Biagioni, A., Bouhadef, B., Bozza, C., Cacopardo, G., Calamai, M., Calì, C., Calvo, D., Capone, A., Caruso, F., Ceres, A., Chiarusi, T., Circella, M., Cocimano, R., Coniglione, R., Costa, M., Cuttone, G., D’Amato, C., D’Amico, A., De Bonis, G., De Luca, V., Deniskina, N., De rosa, G., di Capua, F., Distefano, C., Enzenhöfer, A., Fermani, P., Ferrara, G., Flaminio, V., Fusco, L.A., Garufi, F., Giordano, V., Gmerk, A., Grasso, R., Grella, G., Hugon, C., Imbesi, M., Kulikovskiy, V., Lahmann, R., Larosa, G., Lattuada, D., Leismüller, K.P., Leonora, E., Litrico, P., Llorens alvarez, C.D., Lonardo, A., Longhitano, F., Lo presti, D., Maccioni, E., Margiotta, A., Marinelli, A., Martini, A., Masullo, R., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C.M., Mongelli, M., Morganti, M., Musico, P., Musumeci, M., Nicolau, C.A., Orlando, A., Orzelli, A., Papaleo, R., Pellegrino, C., Pellegriti, M.G., Perrina, C., Piattelli, P, Pugliatti, C., Pulvirenti, S., Raffaelli, F., Randazzo, N., Real, D., Riccobene, G., Rovelli, A., Saldaña, M., Sanguineti, M., Sapienza, P., Sciacca, V., Sgura, I., Simeone, F., Sipala, V., Speziale, F., Spitaleri, A., Spurio, M., Stellacci, S.M., Taiuti, M., Terreni, G., Trasatti, L., Trovato, A., Ventura, C., Vicini, P., Viola, S., Vivolo, D., Adrian-Martinez, S, Aiello, S, Ameli, F, Anghinolfi, M, Ardid, M, Barbarino, G, Barbarito, E, Barbato, Fct, Beverini, N, Biagi, S, Biagioni, A, Bouhadef, B, Bozza, C, Cacopardo, G, Calamai, M, Cali, C, Calvo, D, Capone, A, Caruso, F, Ceres, A, Chiarusi, T, Circella, M, Cocimano, R, Coniglione, R, Costa, M, Cuttone, G, D'Amato, C, D'Amico, A, De Bonis, G, De Luca, V, Deniskina, N, De Rosa, G, di Capua, F, Distefano, C, Enzenhofer, A, Fermani, P, Ferrara, G, Flaminio, V, Fusco, La, Garufi, F, Giordano, V, Gmerk, A, Grasso, R, Grella, G, Hugon, C, Imbesi, M, Kulikovskiy, V, Lahmann, R, Larosa, G, Lattuada, D, Leismuller, Kp, Leonora, E, Litrico, P, Alvarez, Cdl, Lonardo, A, Longhitano, F, Lo Presti, D, Maccioni, E, Margiotta, A, Marinelli, A, Martini, A, Masullo, R, Migliozzi, P, Migneco, E, Miraglia, A, Mollo, Cm, Mongelli, M, Morganti, M, Musico, P, Musumeci, M, Nicolau, Ca, Orlando, A, Orzelli, A, Papaleo, R, Pellegrino, C, Pellegriti, Mg, Perrina, C, Pugliatti, C, Pulvirenti, S, Raffaelli, F, Randazzo, N, Real, D, Riccobene, G, Rovelli, A, Saldana, M, Sanguineti, M, Sapienza, P, Sciacca, V, Sgura, I, Simeone, F, Sipala, V, Speziale, F, Spitaleri, A, Spurio, M, Stellacci, Sm, Taiuti, M, Terreni, G, Trasatti, L, Trovato, A, Ventura, C, Vicini, P, Viola, S, Vivolo, D, Adrián Martínez, S., Barbarino, Giancarlo, Barbato, FELICIA CARLA TIZIANA, DE ROSA, Gianfranca, DI CAPUA, Francesco, Fusco, L. A., Garufi, Fabio, Leismüller, K. P., Llorens alvarez, C. D., Migliozzi, Pasquale, Mollo, C. M., Nicolau, C. A., Pellegriti, M. G., Stellacci, S. M., Vivolo, Daniele, Adrian-Martinez, S., Barbato, F. C. T., Cali, C., D'Amato, C., D'Amico, A., Derosa, G., Enzenhofer, A., Leismuller, K. P., Llorensalvarez, C. D., Lopresti, D., Piattelli, P., Saldana, M., ARAG - AREA FINANZA E PARTECIPATE, DIPARTIMENTO DI FISICA E ASTRONOMIA 'AUGUSTO RIGHI', Da definire, and AREA MIN. 02 - Scienze fisiche

Subjects
optical properties, Physics - Instrumentation and Detectors, Design, Physics and Astronomy (miscellaneous), Instrumentation, Neutrino astronomy, KM3, FOS: Physical sciences, Project, Mediterranean, PHASE-2, KM3, 01 natural sciences, ACOUSTIC POSITIONING SYSTEM, NEUTRINO TELESCOPES, PROJECT, DESIGN, SMO, water Cherenkov, NEMO, Observatory, 0103 physical sciences, Underwater, Engineering (miscellaneous), 010306 general physics, Phase-2, Remote sensing, 010308 nuclear & particles physics, neutrino telescope, Capopassero, Instrumentation and Detectors (physics.ins-det), KM3NeT, Neutrino astronomy, FISICA APLICADA, Environmental science, Submarine pipeline, Light emission, Acoustic positioning system, Neutrino, Neutrino telescopes, Tower
Abstract

The NEMO Phase-2 tower is the first detector which was operated underwater for more than one year at the "record" depth of 3500 m. It was designed and built within the framework of the NEMO (NEutrino Mediterranean Observatory) project. The 380 m high tower was successfully installed in March 2013 80 km offshore Capo Passero (Italy). This is the first prototype operated on the site where the italian node of the KM3NeT neutrino telescope will be built. The installation and operation of the NEMO Phase-2 tower has proven the functionality of the infrastructure and the operability at 3500 m depth. A more than one year long monitoring of the deep water characteristics of the site has been also provided. In this paper the infrastructure and the tower structure and instrumentation are described. The results of long term optical background measurements are presented. The rates show stable and low baseline values, compatible with the contribution of 40K light emission, with a small percentage of light bursts due to bioluminescence. All these features confirm the stability and good optical properties of the site., Comment: 12 pages, 17 figures

Published
2016

13. The prototype detection unit of the KM3NeT detector: KM3NeT Collaboration

Author

S. Adrián-Martínez, M. Ageron, F. Aharonian, S. Aiello, A. Albert, F. Ameli, E. G. Anassontzis, G. C. Androulakis, M. Anghinolfi, G. Anton, S. Anvar, M. Ardid, T. Avgitas, K. Balasi, H. Band, G. Barbarino, E. Barbarito, F. Barbato, B. Baret, S. Baron, J. Barrios, A. Belias, E. Berbee, A. M. van den Berg, A. Berkien, V. Bertin, S. Beurthey, V. van Beveren, N. Beverini, S. Biagi, A. Biagioni, S. Bianucci, M. Billault, A. Birbas, H. Boer Rookhuizen, R. Bormuth, V. Bouché, B. Bouhadef, G. Bourlis, C. Boutonnet, M. Bouwhuis, C. Bozza, R. Bruijn, J. Brunner, G. Cacopardo, L. Caillat, M. Calamai, D. Calvo, A. Capone, L. Caramete, F. Caruso, S. Cecchini, A. Ceres, R. Cereseto, C. Champion, F. Château, T. Chiarusi, B. Christopoulou, M. Circella, L. Classen, R. Cocimano, A. Coleiro, S. Colonges, R. Coniglione, A. Cosquer, M. Costa, P. Coyle, A. Creusot, G. Cuttone, C. D’Amato, A. D’Amico, G. De Bonis, G. De Rosa, N. Deniskina, J.-J. Destelle, C. Distefano, F. Di Capua, C. Donzaud, D. Dornic, Q. Dorosti-Hasankiadeh, E. Drakopoulou, D. Drouhin, L. Drury, D. Durand, T. Eberl, D. Elsaesser, A. Enzenhöfer, P. Fermani, L. A. Fusco, D. Gajanana, T. Gal, S. Galatà, F. Garufi, M. Gebyehu, V. Giordano, N. Gizani, R. Gracia Ruiz, K. Graf, R. Grasso, G. Grella, A. Grmek, R. Habel, H. van Haren, T. Heid, A. Heijboer, E. Heine, S. Henry, J. J. Hernández-Rey, B. Herold, M. A. Hevinga, M. van der Hoek, J. Hofestädt, J. Hogenbirk, C. Hugon, J. Hößl, M. Imbesi, C. W. James, P. Jansweijer, J. Jochum, M. de Jong, M. Jongen, M. Kadler, O. Kalekin, A. Kappes, E. Kappos, U. Katz, O. Kavatsyuk, P. Keller, G. Kieft, E. Koffeman, H. Kok, P. Kooijman, J. Koopstra, A. Korporaal, A. Kouchner, I. Kreykenbohm, V. Kulikovskiy, R. Lahmann, P. Lamare, G. Larosa, D. Lattuada, H. Le Provost, K. P. Leismüller, A. Leisos, D. Lenis, E. Leonora, M. Lindsey Clark, C. D. Llorens Alvarez, H. Löhner, A. Lonardo, S. Loucatos, F. Louis, E. Maccioni, K. Mannheim, K. Manolopoulos, A. Margiotta, O. Mariş, C. Markou, J. A. Martínez-Mora, A. Martini, R. Masullo, K. W. Melis, T. Michael, P. Migliozzi, E. Migneco, A. Miraglia, C. M. Mollo, M. Mongelli, M. Morganti, S. Mos, Y. Moudden, P. Musico, M. Musumeci, C. Nicolaou, C. A. Nicolau, A. Orlando, A. Orzelli, A. Papaikonomou, R. Papaleo, G. E. Păvălaş, H. Peek, C. Pellegrino, M. G. Pellegriti, C. Perrina, P. Piattelli, K. Pikounis, V. Popa, Th. Pradier, M. Priede, G. Pühlhofer, S. Pulvirenti, C. Racca, F. Raffaelli, N. Randazzo, P. A. Rapidis, P. Razis, D. Real, L. Resvanis, J. Reubelt, G. Riccobene, A. Rovelli, M. Saldaña, D. F. E. Samtleben, M. Sanguineti, A. Santangelo, P. Sapienza, J. Schmelling, J. Schnabel, V. Sciacca, M. Sedita, T. Seitz, I. Sgura, F. Simeone, V. Sipala, A. Spitaleri, M. Spurio, G. Stavropoulos, J. Steijger, T. Stolarczyk, D. Stransky, M. Taiuti, G. Terreni, D. Tézier, S. Théraube, L. F. Thompson, P. Timmer, L. Trasatti, A. Trovato, M. Tselengidou, A. Tsirigotis, S. Tzamarias, E. Tzamariudaki, B. Vallage, V. Van Elewyck, J. Vermeulen, P. Vernin, P. Vicini, S. Viola, D. Vivolo, P. Werneke, L. Wiggers, J. Wilms, E. de Wolf, R. H. L. van Wooning, E. Zonca, J. D. Zornoza, J. Zúñiga, A. Zwart, Adrian-Martinez, S., Ageron, M., Aharonian, F., Aiello, S., Albert, A., Ameli, F., Anassontzis, E. G., Androulakis, G. C., Anghinolfi, M., Anton, G., Anvar, S., Ardid, M., Avgitas, T., Balasi, K., Band, H., Barbarino, G., Barbarito, E., Barbato, F., Baret, B., Baron, S., Barrios, J., Belias, A., Berbee, E., van den Berg, A. M., Berkien, A., Bertin, V., Beurthey, S., van Beveren, V., Beverini, N., Biagi, S., Biagioni, A., Bianucci, S., Billault, M., Birbas, A., Boer Rookhuizen, H., Bormuth, R., Bouche, V., Bouhadef, B., Bourlis, G., Boutonnet, C., Bouwhuis, M., Bozza, C., Bruijn, R., Brunner, J., Cacopardo, G., Caillat, L., Calamai, M., Calvo, D., Capone, A., Caramete, L., Caruso, F., Cecchini, S., Ceres, A., Cereseto, R., Champion, C., Chateau, F., Chiarusi, T., Christopoulou, B., Circella, M., Classen, L., Cocimano, R., Coleiro, A., Colonges, S., Coniglione, R., Cosquer, A., Costa, M., Coyle, P., Creusot, A., Cuttone, G., D'Amato, C., D'Amico, A., De Bonis, G., De Rosa, G., Deniskina, N., Destelle, J. -J., Distefano, C., Di Capua, F., Donzaud, C., Dornic, D., Dorosti-Hasankiadeh, Q., Drakopoulou, E., Drouhin, D., Drury, L., Durand, D., Eberl, T., Elsaesser, D., Enzenhofer, A., Fermani, P., Fusco, L. A., Gajanana, D., Gal, T., Galata, S., Garufi, F., Gebyehu, M., Giordano, V., Gizani, N., Gracia Ruiz, R., Graf, K., Grasso, R., Grella, G., Grmek, A., Habel, R., van Haren, H., Heid, T., Heijboer, A., Heine, E., Henry, S., Hernandez-Rey, J. J., Herold, B., Hevinga, M. A., van der Hoek, M., Hofestadt, J., Hogenbirk, J., Hugon, C., Hossl, J., Imbesi, M., James, C. W., Jansweijer, P., Jochum, J., de Jong, M., Jongen, M., Kadler, M., Kalekin, O., Kappes, A., Kappos, E., Katz, U., Kavatsyuk, O., Keller, P., Kieft, G., Koffeman, E., Kok, H., Kooijman, P., Koopstra, J., Korporaal, A., Kouchner, A., Kreykenbohm, I., Kulikovskiy, V., Lahmann, R., Lamare, P., Larosa, G., Lattuada, D., Le Provost, H., Leismuller, K. P., Leisos, A., Lenis, D., Leonora, E., Lindsey Clark, M., Llorens Alvarez, C. D., Lohner, H., Lonardo, A., Loucatos, S., Louis, F., Maccioni, E., Mannheim, K., Manolopoulos, K., Margiotta, A., Maris, O., Markou, C., Martinez-Mora, J. A., Martini, A., Masullo, R., Melis, K. W., Michael, T., Migliozzi, P., Migneco, E., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Mos, S., Moudden, Y., Musico, P., Musumeci, M., Nicolaou, C., Nicolau, C. A., Orlando, A., Orzelli, A., Papaikonomou, A., Papaleo, R., Pavalas, G. E., Peek, H., Pellegrino, C., Pellegriti, M. G., Perrina, C., Piattelli, P., Pikounis, K., Popa, V., Pradier, T., Priede, M., Puhlhofer, G., Pulvirenti, S., Racca, C., Raffaelli, F., Randazzo, N., Rapidis, P. A., Razis, P., Real, D., Resvanis, L., Reubelt, J., Riccobene, G., Rovelli, A., Saldana, M., Samtleben, D. F. E., Sanguineti, M., Santangelo, A., Sapienza, P., Schmelling, J., Schnabel, J., Sciacca, V., Sedita, M., Seitz, T., Sgura, I., Simeone, F., Sipala, V., Spitaleri, A., Spurio, M., Stavropoulos, G., Steijger, J., Stolarczyk, T., Stransky, D., Taiuti, M., Terreni, G., Tezier, D., Theraube, S., Thompson, L. 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Subjects
Physics, Photomultiplier, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Detector, Monte Carlo method, 01 natural sciences, Signal, Optics, KM3NeT, 0103 physical sciences, Calibration, 14. Life underwater, Neutrino, 010306 general physics, business, Engineering (miscellaneous), Cherenkov radiation
Abstract

A prototype detection unit of the KM3NeT deep-sea neutrino telescope has been installed at 3500m depth 80 km offshore the Italian coast. KM3NeT in its final configuration will contain several hundreds of detection units. Each detection unit is a mechanical structure anchored to the sea floor, held vertical by a submerged buoy and supporting optical modules for the detection of Cherenkov light emitted by charged secondary particles emerging from neutrino interactions. This prototype string implements three optical modules with 31 photomultiplier tubes each. These optical modules were developed by the KM3NeT Collaboration to enhance the detection capability of neutrino interactions. The prototype detection unit was operated since its deployment in May 2014 until its decommissioning in July 2015. Reconstruction of the particle trajectories from the data requires a nanosecond accuracy in the time calibration. A procedure for relative time calibration of the photomultiplier tubes contained in each optical module is described. This procedure is based on the measured coincidences produced in the sea by the $$^{40}$$40K background light and can easily be expanded to a detector with several thousands of optical modules. The time offsets between the different optical modules are obtained using LED nanobeacons mounted inside them. A set of data corresponding to 600 h of livetime was analysed. The results show good agreement with Monte Carlo simulations of the expected optical background and the signal from atmospheric muons. An almost background-free sample of muons was selected by filtering the time correlated signals on all the three optical modules. The zenith angle of the selected muons was reconstructed with a precision of about 3$$^circ $$∘.

Published
2016

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