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1. Design and construction of the fast photon detection system for COMPASS RICH-1

Author

J. Polak, M. Alexeev, V.N. Kolosov, Christian Schill, M. L. Colantoni, L. Steiger, H. Wollny, P. Schoenmeier, G. Menon, S. Gerassimov, F. Kunne, D. Neyret, M. Slunečka, M. Svec, A. Mann, A. Mutter, N. Dibiase, A. Lehmann, V. Duic, P. Ciliberti, S. Levorato, D. Panzieri, V. Diaz, B. Ketzer, F. Robinet, K. Königsmann, R. Joosten, R. Hagemann, B. Gobbo, M. Finger, W. Schröder, Eric Delagnes, M. Chiosso, Andrea Ferrero, F. Nerling, S. Dalla Torre, T. Dafni, R. Birsa, A. Maggiora, A. Teufel, Anne-Laure Martin, Laura Silva, F. Tessarotto, Daniel B. Kramer, P. Bordalo, F. Sozzi, P. Rebourgeard, S. Takekawa, H. Deschamps, H. Fischer, Soumen Paul, Ph. Abbon, O. Nähle, Andrea Bressan, C. Pizzolotto, I. Konorov, F.H. Heinsius, Miroslav Sulc, A. Magnon, M. Giorgi, O. Y. Denisov, W. Eyrich, D. von Harrach, G. Pesaro, Elena Rocco, Franco Bradamante, P. Schiavon, H. Angerer, Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département de Physique Nucléaire (ex SPhN) (DPHN), COMPASS, P., Abbon, M., Alexeev, H., Angerer, R., Birsa, P., Bordalo, Bradamante, Franco, Bressan, Andrea, M., Chiosso, Ciliberti, Piero, M., Colantoni, T., Dafni, S., Dallatorre, E., Delagne, O., Denisov, H., Deschamp, V., Diaz, N., Dibiase, Duic, Venicio, W., Eyrich, A., Ferrero, M., Finger, M., Fingerjr, H., Fischer, S., Gerassimov, Giorgi, Marcello, B., Gobbo, R., Hagemann, D., Vonharrach, F. H., Heinsiu, R., Joosten, B., Ketzer, V. N., Kolosov, K., Koenigsmann, I., Konorov, D., Kramer, F., Kunne, A., Lehmann, Levorato, Stefano, A., Maggiora, A., Magnon, A., Mann, Martin, Anna, G., Menon, A., Mutter, O., Naehle, F., Nerling, D., Neyret, D., Panzieri, S., Paul, Pesaro, Giulia, C., Pizzolotto, J., Polak, P., Rebourgeard, F., Robinet, E., Rocco, Schiavon, Paolo, C., Schill, P., Schoenmeier, W., Schroeder, L., Silva, M., Slunecka, Sozzi, Federica, L., Steiger, M., Sulc, M., Svec, Takekawa, Stefano, F., Tessarotto, A., Teufel, and H., Wollny

Subjects
Nuclear and High Energy Physics, Photomultiplier, Physics::Instrumentation and Detectors, Multi-anode photo-multiplier, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], COMPASS, 01 natural sciences, Particle identification, law.invention, Optics, RICH, Quartz lens telescope, law, Compass, 0103 physical sciences, COMPASS experiment, Angular resolution, Electronics, 010306 general physics, Instrumentation, Cherenkov radiation, Physics, Large Hadron Collider, 010308 nuclear & particles physics, business.industry, Lens (optics), High Energy Physics::Experiment, business
Abstract

International audience; New photon detectors, based on the use of multi-anode photo-multiplier tubes coupled to individual lens telescopes and read out with a dedicated read-out electronics system, equip the central region of the Cherenkov imaging counter RICH-1 of the COMPASS experiment at CERN SPS. They are characterised by high photon yield, fast response and high rate capability and are successfully in operation since the 2006 COMPASS data taking. The photon detection system fully matches the expected performance. The design and construction of the photon detectors are described in detail.

Published
2010
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2. The COMPASS RICH-1 fast photon detection system

Author

P. Abbon, M. Alexeev, H. Angerer, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, M. Chiosso, P. Ciliberti, M.L. Colantoni, T. Dafni, S. Dalla Torre, E. Delagnes, O. Denisov, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, A. Ferrero, M. Finger, M. Finger Jr., H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, R. Hagemann, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, V.N. Kolosov, K. Königsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, D. Panzieri, S. Paul, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, P. Schoenmeier, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, S. Takekawa, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P, Alexeev, M, Angerer, H, Birsa, R, Bordalo, P, Bradamante, F, Bressan, Andrea, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Dafni, T, DALLA TORRE, S, Delagnes, E, Denisov, O, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, M, Gobbo, B, Hagemann, R, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, KOLOSOV V., N, Königsmann, K, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, Stefano, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Panzieri, D, Paul, S, Pesaro, G, Pizzolotto, C, Polak, J, Rebourgeard, P, Robinet, F, Rocco, E, Schiavon, Paolo, Schill, C, Schoenmeier, P, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Takekawa, Stefano, Tessarotto, F, Teufel, A, and Wollny, H.

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Physics::Instrumentation and Detectors, business.industry, Photon detector, Detector, law.invention, Lens (optics), Optics, Upgrade, law, Compass, Systems design, Optoelectronics, High Energy Physics::Experiment, business, Instrumentation, Photon detection
Abstract

A fast photon detection system has been built as a part of the upgrade of the COMPASS RICH-1 detector: it is based on 576 multi-anode photomultiplier tubes (MAPMTs) coupled to individual fused silica lens telescopes and fast readout electronics. This system has replaced the MWPCs with CsI photo-cathodes in the central region ( 1.3 m 2 , 25% of the total area) of the COMPASS RICH-1 photon detectors and has successfully been operated during the data taking in 2006 and 2007. We report about the fast photon detection system design, construction and commissioning, in particular about the design optimization and the validation tests of the lens telescopes. Preliminary values for the increased performances of COMPASS RICH-1 after the upgrade are also presented.

Published
2008
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3. The fast readout system for the MAPMTs of COMPASS RICH-1

Author

P. Abbon, M. Alexeev, H. Angerer, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, M. Chiosso, P. Ciliberti, M.L. Colantoni, T. Dafni, S. Dalla Torre, E. Delagnes, O. Denisov, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, R. Hagemann, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, V.N. Kolosov, K. Königsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, D. Panzieri, S. Paul, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, P. Schoenmeier, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, S. Takekawa, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P, Alexeev, M, Angerer, H, Birsa, R, Bordalo, P, Bradamante, Franco, Bressan, Andrea, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Dafni, T, DALLA TORRE, S, Delagnes, E, Denisov, O, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, M, Gobbo, B, Hagemann, R, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, KOLOSOV V., N, Königsmann, K, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, Stefano, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Panzieri, D, Paul, S, Pesaro, G, Pizzolotto, C, Polak, J, Rebourgeard, P, Robinet, F, Rocco, E, Schiavon, Paolo, Schill, C, Schoenmeier, P, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Takekawa, Stefano, Tessarotto, F, Teufel, A, and Wollny, H.

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, business.industry, Detector, Photon flux, FOS: Physical sciences, Readout electronics, Instrumentation and Detectors (physics.ins-det), Chip, Particle identification, Upgrade, Optics, Compass, Detectors and Experimental Techniques, business, Instrumentation
Abstract

A fast readout system for the upgrade of the COMPASS RICH detector has been developed and successfully used for data taking in 2006 and 2007. The new readout system for the multi-anode PMTs in the central part of the photon detector of the RICH is based on the high-sensitivity MAD4 preamplifier-discriminator and the dead-time free F1-TDC chip characterized by high-resolution. The readout electronics has been designed taking into account the high photon flux in the central part of the detector and the requirement to run at high trigger rates of up to 100 kHz with negligible dead-time. The system is designed as a very compact setup and is mounted directly behind the multi-anode photomultipliers. The data are digitized on the frontend boards and transferred via optical links to the readout system. The read-out electronics system is described in detail together with its measured performances., Comment: Proceeding of RICH2007 Conference, Trieste, Oct. 2007. v2: minor changes

Published
2008
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4. The COMPASS RICH-1 detector upgrade

Author

P. Abbon, M. Alekseev, H. Angerer, M. Apollonio, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, L. Busso, M. Chiosso, P. Ciliberti, M. L. Colantoni, S. Costa, S. Dalla Torre, T. Dafni, E. Delagnes, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, D. Faso, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, R. Hagemann, D. von Harrach, F. H. Heinsius, R. Joosten, B. Ketzer, K. Königsmann, V. N. Kolosov, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, P. Pagano, S. Panebianco, D. Panzieri, S. Paul, G. Pesaro, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P, Alekseev, M, Angerer, H, Apollonio, M, Birsa, R, Bordalo, P, Bradamante, F, Bressan, Andrea, Busso, L, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Costa, S, DALLA TORRE, S, Dafni, T, Delagnes, E, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Faso, D, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, M, Gobbo, B, Hagemann, R, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, Königsmann, K, KOLOSOV V., N, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, S, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Pagano, P, Panebianco, S, Panzieri, D, Paul, S, Pesaro, G, Polak, J, Rebourgeard, P, Robinet, F, Rocco, E, Schiavon, Paolo, Schill, C, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Tessarotto, F, Teufel, A, and Wollny, H.

Subjects
Physics, Photomultiplier, Physics::Instrumentation and Detectors, business.industry, Cherenkov detector, Detector, General Physics and Astronomy, Ring-imaging Cherenkov detector, law.invention, Nuclear physics, Upgrade, Optics, law, Compass, COMPASS experiment, High Energy Physics::Experiment, General Materials Science, Physical and Theoretical Chemistry, business, Cherenkov radiation
Abstract

The COMPASS experiment at CERN provides hadron identification in a wide momentum range employing a large size gaseous Ring Imaging CHerenkov detector (RICH). The presence of large uncorrelated background in the COMPASS environment was limiting the efficiency of COMPASS RICH-1 in the very forward regime. A major upgrade of RICH-1 required a new technique for Cherenkov photon detection at count rates of several 106/s per channel in the central detector part, and a read-out system allowing for trigger rates of up to 100 kHz. To cope with these requirements, the photon detectors of the central region have been replaced with a fast photon detection system described here, while, in the peripheral regions, the existing multi-wire proportional chambers with CsI photo-cathodes have been equipped with a new read-out system based on APV preamplifiers and flash ADC chips. The new system consists of multi-anode photomultiplier tubes (MAPMTs) coupled to individual fused silica lens telescopes, and fast read-out electronics based on the MAD4 amplifier-discriminator and the dead-time free F1 TDC chip. The project was completely designed and implemented in less than two years: The upgraded detector is in operation since the 2006 CERN SPS run. We present the photon detection design, constructive aspects and test studies to characterise the single photon response of the MAPMTs coupled to the read-out system as well as the detector performance based on the 2006 data.

Published
2008

5. Pattern recognition and PID for COMPASS RICH-1

Author

P. Abbon, M. Alexeev, H. Angerer, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, M. Chiosso, P. Ciliberti, M.L. Colantoni, T. Dafni, S. Dalla Torre, E. Delagnes, O. Denisov, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, R. Hagemann, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, V.N. Kolosov, K. Königsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, D. Panzieri, S. Paul, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, P. Schoenmeier, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, S. Takekawa, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P, Alexeev, M, Angerer, H, Birsa, R, Bordalo, P, Bradamante, F, Bressan, Andrea, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Dafni, T, DALLA TORRE, S, Delagnes, E, Denisov, O, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, M, Gobbo, B, Hagemann, R, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, KOLOSOV V., N, Königsmann, K, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, Stefano, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Panzieri, D, Paul, S, Pesaro, G, Pizzolotto, C, Polak, J, Rebourgeard, P, Robinet, F, Rocco, E, Schiavon, Paolo, Schill, C, Schoenmeier, P, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Takekawa, Stefano, Tessarotto, F, Teufel, A, and Wollny, H.

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, business.industry, Photon detector, Detector, PID controller, FOS: Physical sciences, Pattern recognition, Instrumentation and Detectors (physics.ins-det), Photon yield, Particle identification, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Compass, Pattern recognition (psychology), Artificial intelligence, Detectors and Experimental Techniques, business, Instrumentation
Abstract

A package for pattern recognition and PID by COMPASS RICH-1 has been developed and used for the analysis of COMPASS data collected in the years 2002 to 2004, and 2006-2007 with the upgraded RICH-1 photon detectors. It has allowed the full characterization of the detector in the starting version and in the upgraded one, as well as the PID for physics results. We report about the package structure and algorithms, and the detector characterization and PID results., 4 pages, 4 figures,to appear in the proceedings of 6th International Workshop on Ring Imaging Cherenkov Counters (RICH 2007), Trieste, Italy, 15-20 Oct 2007

Published
2008

6. Read-out electronics for fast photon detection with COMPASS RICH-1

Author

P. Abbon, M. Alexeev, H. Angerer, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, M. Chiosso, P. Ciliberti, M. Colantoni, T. Dafni, S. Dalla Torre, E. Delagnes, O. Denisov, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, R. Hagemann, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, V.N. Kolosov, K. Königsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, D. Panzieri, S. Paul, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, P. Schoenmeier, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, S. Takekawa, F. Tessarotto, A. Teufel, and H. Wollny

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, business.industry, Detector, Chip, Particle identification, Optics, Compass, COMPASS experiment, Electronics, business, Instrumentation, Photon detection
Abstract

A new read-out electronics system has been developed for the fast photon detection of the central region of the COMPASS RICH-1. The project is based on multi-anode photomultipliers read out by the high-sensitivity MAD4 preamplifier-discriminator and the dead-time free F1 TDC chip characterised by high time resolution. The system has been designed taking into account the high photon flux in the central region of the detector and the high rate requirement of the COMPASS experiment. The system is described in detail together with the measured performances. The new electronics system has been installed and used for the 2006 data taking; it entirely fulfils the expected performances.

Published
2008

7. The characterisation of the multianode photomultiplier tubes for the RICH-1 upgrade project at COMPASS

Author

P. Abbon, M. Alexeev, H. Angerer, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, M. Chiosso, P. Ciliberti, M.L. Colantoni, T. Dafni, S. Dalla Torre, E. Delagnes, O. Denisov, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, R. Hagemann, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, V.N. Kolosov, K. Königsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, D. Panzieri, S. Paul, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, P. Schoenmeier, W. Schroeder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, S. Takekawa, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P, Alexeev, M, Angerer, H, Birsa, R, Bordalo, P, Bradamante, F, Bressan, Andrea, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Dafni, T, DALLA TORRE, S, Delagnes, E, Denisov, O, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, M, Gobbo, B, Hagemann, R, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, KOLOSOV V., N, Königsmann, K, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, Stefano, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Panzieri, D, Paul, S, Pesaro, G, Pizzolotto, C, Polak, J, Rebourgeard, P, Robinet, F, Rocco, E, Schiavon, Paolo, Schill, C, Schoenmeier, P, Schroeder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Takekawa, Stefano, Tessarotto, F, Teufel, A, and Wollny, H.

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Photon, Physics::Instrumentation and Detectors, business.industry, Detector, Optics, Upgrade, Compass, Quantum efficiency, business, Instrumentation, Cherenkov radiation, Dark current
Abstract

A major upgrade of the Cherenkov photon detection system of COMPASS RICH-1 has been performed and it has been in operation since the 2006 physics run. The inner part of the photon detector has been replaced by a different technology in order to measure Cherenkov photons at high photoelectron rates, up to several times 10 6 per second and per channel. Cherenkov photons from 200 to 750 nm are detected by 576 multianode photomultiplier tubes (MAPMTs) with 16 channels each, coupled to individual fused silica lens telescopes and fast, high sensitivity and high time resolution electronics read-out. To guarantee an optimal performance of the complete system, parameters like dark current, gain, uniformity, relative quantum efficiency have been measured for a totality of more than 600 MAPMTs (about 10 000 channels) in a fully automated test-stand, developed for this purpose. The ideal working point for each individual pixel could be ascertained by these measurements. In 2006 the newly equipped detector exhibited an excellent performance: about 56 detected photons per ring at saturation and a time resolution of better than 1 ns. We report about the MAPMT characterisation and the quality control set-up, protocol and results.

Published
2008

8. Fast photon detection for COMPASS RICH-1

Author

P. Abbon, M. Alekseev, H. Angerer, M. Apollonio, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, L. Busso, M. Chiosso, P. Ciliberti, M.L. Colantoni, S. Costa, N. Dibiase, T. Dafni, S. Dalla Torre, V. Diaz, V. Duic, E. Delagnes, H. Deschamps, W. Eyrich, D. Faso, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, K. Königsmann, V.N. Kolosov, I. Konorov, D. Kramer, F. Kunne, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, D. Neyret, F. Nerling, P. Pagano, S. Paul, S. Panebianco, D. Panzieri, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, E. Rocco, F. Robinet, P. Schiavon, C. Schill, P. Schoenmeier, L. Silva, M. Slunecka, L. Steiger, F. Sozzi, M. Sulc, M. Svec, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P, Alekseev, M, Angerer, H, Apollonio, M, Birsa, R, Bordalo, P, Bradamante, Franco, Bressan, Andrea, Busso, L, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Costa, S, Dibiase, N, Dafni, T, TORRE S., Dalla, Diaz, V, Duic, V, Delagnes, E, Deschamps, H, Eyrich, W, Faso, D, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, Marcello, Gobbo, B, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, Königsmann, K, KOLOSOV V., N, Konorov, I, Kramer, D, Kunne, F, Levorato, Stefano, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Neyret, D, Nerling, F, Pagano, P, Paul, S, Panebianco, S, Panzieri, D, Pesaro, G, Pizzolotto, C, Polak, J, Rebourgeard, P, Rocco, E, Robinet, F, Schiavon, Paolo, Schill, C, Schoenmeier, P, Silva, L, Slunecka, M, Steiger, L, Sozzi, F, Sulc, M, Svec, M, Tessarotto, F, Teufel, A, and Wollny, H.

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, business.industry, UV lenses, Emphasis (telecommunications), Detector, COMPASS, Photocathode, Optics, Upgrade, Photon detection, Compass, RICH, Multianode photomultiplier tubes, Systems design, Electronics, business, Instrumentation
Abstract

A fast photon detection system has been built and assembled for the upgrade of COMPASS RICH-1. The system is based on multianode photomultipliers coupled to fused silica lenses to collect the light from a larger surface and to guide it to the photocathode, preserving the position information. The emphasis is on the fast response and high rate capability of the detectors and the associated electronics. The photon detection system is now ready and it will be employed in the 2006 COMPASS data taking. We report about the system design and construction.

Published
2007

9. The fast photon detection system of COMPASS RICH-1

Author

P. Abbon, M. Alekseev, H. Angerer, M. Apollonio, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, L. Busso, M. Chiosso, P. Ciliberti, M.L. Colantoni, S. Costa, T. Dafni, S. Dalla Torre, E. Delagnes, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, D. Faso, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, V.N. Kolosov, K. Königsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, P. Pagano, S. Panebianco, D. Panzieri, S. Paul, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, E. Rocco, F. Robinet, P. Schiavon, C. Schill, P. Schoenmeier, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P., Alekseev, M., Angerer, H., Apollonio, M., Birsa, R., Bordalo, P., Bradamante, F., Bressan, A., Busso, L., Chiosso, M., Ciliberti, P., Colantoni, M. L., Costa, S., Dafni, T., Dalla Torre, S., Delagnes, E., Deschamps, H., Diaz, V., Dibiase, N., Duic, V., Eyrich, W., Faso, D., Ferrero, A., Finger, M., Finger Jr., M., Fischer, H., Gerassimov, S., Giorgi, M., Gobbo, B., von Harrach, D., Heinsius, F. H., Joosten, R., Ketzer, B., Kolosov, V. N., Königsmann, K., Konorov, I., Kramer, D., Kunne, F., Lehmann, A., Levorato, S., Maggiora, A., Magnon, A., Mann, A., Martin, A., Menon, G., Mutter, A., Nähle, O., Nerling, F., Neyret, D., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pesaro, G., Pizzolotto, Cecilia, Polak, J., Rebourgeard, P., Rocco, E., Robinet, F., Schiavon, P., Schill, C., Schoenmeier, P., Schröder, W., Silva, L., Slunecka, M., Sozzi, F., Steiger, L., Sulc, M., Svec, M., Tessarotto, F., Teufel, A., Wollny, H., Abbon, P, Alekseev, M, Angerer, H, Apollonio, M, Birsa, R, Bordalo, P, Bradamante, F, Bressan, Andrea, Busso, L, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Costa, S, Dafni, T, DALLA TORRE, S, Delagnes, E, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Faso, D, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, M, Gobbo, B, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, KOLOSOV V., N, Königsmann, K, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, Stefano, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Pagano, P, Panebianco, S, Panzieri, D, Paul, S, Pesaro, G, Pizzolotto, C, Polak, J, Rebourgeard, P, Rocco, E, Robinet, F, Schiavon, Paolo, Schill, C, Schoenmeier, P, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Tessarotto, F, and Teufel, A

Subjects
Photomultiplier, Nuclear and High Energy Physics, Photon, Multi-anode photomultiplier tubes, Physics::Instrumentation and Detectors, UV lenses, COMPASS, Photon detection, RICH, Instrumentation, law.invention, FAST-RICH, DEUTERON, READOUT, DESIGN, Optics, law, Multi-anode photomultiplier tube, Compass, COMPASS experiment, Nuclear and High Energy Physic, Physics, Large Hadron Collider, business.industry, Detector, Lens (optics), Upgrade, UV lense, High Energy Physics::Experiment, business
Abstract

A fast photon detection system has been built for the upgrade of COMPASS RICH-1, the large size gaseous RICH detector in use at the COMPASS Experiment at the CERN SPS since 2001. The photon detectors of the central region have been replaced by a new system based on multi-anode photomultipliers coupled to individual fused silica lens telescopes and a fast readout electronics system, while in the outer region the existing MWPCs with CsI photocathodes have been equipped with a new readout system, based on the APV chip. RICH-1 has been successfully operated in its upgraded version during the 2006 run. We report on the upgrade design and construction, and on the preliminary characterization of the upgraded RICH-1 performances: at saturation about 60 photons per ring have routinely been obtained and the background level has drastically been reduced thanks to the good time resolution of the new system, leading to a 2 σ π –K separation above 55 GeV/c.

Published
2007

10. A highly integrated low-cost readout system for the COMPASS RICH-1 detector

Author

P. Abbon, M. Alekseev, H. Angerer, M. Apollonio, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, L. Busso, M. Chiosso, P. Ciliberti, M. L. Colantoni, S. Costa, T. Dafni, S. Dalla Torre, E. Delagnes, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, D. Faso, A. Ferrero, M. Finger, H. Fischer, M. Georgi, S. Gerassimov, B. Gobbo, R. Hagemann, D. von Harrach, F. H. Heinsius, R. Joosten, B. Ketzer, V. N. Kolosov, K. Konigsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nahle, F. Nerling, D. Neyret, P. Pagano, S. Panebianco, D. Panzieri, S. Paul, G. Pesaro, C. Pizzolotto, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, W. Schroder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, F. Tessarotto, A. Teufel, and H. Wollny

Subjects
Physics, Photomultiplier, Physics::Instrumentation and Detectors, business.industry, Detector, Photodetector, Dead time, Particle identification, Nuclear physics, Optics, Compass, Nuclear electronics, COMPASS experiment, High Energy Physics::Experiment, business
Abstract

Particle identification at high multiplicities is a key feature of the COMPASS experiment at CERN's SPS. Hadrons up to 50 GeV/c are identified by a RICH detector with a large horizontal and vertical acceptance of plusmn250 mrad and plusmn180 mrad, respectively. The central region of the photon detector is equipped with multi-anode photomultiplier tubes, the remaining 75% of the total active area are covered by MWPCs with Csl photocathodes. In order to improve the performance of the detector at very high beam intensities, more than 62000 channels of a new analog readout system of the MWPCs, based on the APV25 chip, were developed and installed in 2006. The new system features good single photon detection efficiency due to its low noise, negligible dead time at trigger rates up to 50 kHz, and low cost. In addition, sampling of the MWPC signal allows us to measure the signal time with a resolution of about 30 ns or better. The architecture of the new readout system as well as the performance results of the RICH-1 detector in the outer region during 2006 COMPASS run will be discussed.

Published
2007
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11. Fast photon detection for the COMPASS RICH detector

Author

P. Abbon, M. Alekseev, H. Angerer, M. Apollonio, R. Birsa, P. Bordalo, F. Bradainante, A. Bressan, L. Busso, M. Chiosso, P. Ciliberti, M.L. Colantoni, S. Costa, S. Dalla Torre, T. Dafni, E. Delagnes, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, D. Faso, A. Ferrero, M. Finger, H. Fischer, S. Gerassimov, M. Giorgi, B. Gobbo, R. Hagemann, D. von Harrach, F.H. Heinsius, R. Joosten, B. Ketzer, K. Königsmann, V.N. Kolosov, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, S. Levorato, A. Maggiora, A. Magnon, A. Mann, A. Martin, G. Menon, A. Mutter, O. Nähle, F. Nerling, D. Neyret, P. Pagano, S. Panebianco, D. Panzieri, S. Paul, G. Pesaro, J. Polak, P. Rebourgeard, F. Robinet, E. Rocco, P. Schiavon, C. Schill, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, M. Svec, F. Tessarotto, A. Teufel, H. Wollny, Abbon, P, Alekseev, M, Angerer, H, Apollonio, M, Birsa, R, Bordalo, P, Bradamante, Franco, Bressan, Andrea, Busso, L, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Costa, S, DALLA TORRE, S, Dafni, T, Delagnes, E, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Faso, D, Ferrero, A, Finger, M, FINGER M., Jr, Fischer, H, Gerassimov, S, Giorgi, Marcello, Gobbo, B, Hagemann, R, VON HARRACH, D, HEINSIUS F., H, Joosten, R, Ketzer, B, Königsmann, K, KOLOSOV V., N, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Levorato, Stefano, Maggiora, A, Magnon, A, Mann, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Nerling, F, Neyret, D, Pagano, P, Panebianco, S, Panzieri, D, Paul, S, Pesaro, G, Polak, J, Rebourgeard, P, Robinet, F, Rocco, E, Schiavon, Paolo, Schill, C, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Svec, M, Tessarotto, F, Teufel, A, and Wollny, H.

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Photon, Large Hadron Collider, business.industry, Physics::Instrumentation and Detectors, Detector, Other Fields of Physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Atomic and Molecular Physics, and Optics, Ring-imaging Cherenkov detector, Optics, Compass, COMPASS experiment, High Energy Physics::Experiment, Detectors and Experimental Techniques, business, Cherenkov radiation
Abstract

The COMPASS experiment at the SPS accelerator at CERN uses a large scale Ring Imaging CHerenkov detector (RICH) to identify pions, kaons and protons in a wide momentum range. For the data taking in 2006, the COMPASS RICH has been upgraded in the central photon detection area (25% of the surface) with a new technology to detect Cherenkov photons at very high count rates of several 10^6 per second and channel and a new dead-time free read-out system, which allows trigger rates up to 100 kHz. The Cherenkov photons are detected by an array of 576 visible and ultra-violet sensitive multi-anode photomultipliers with 16 channels each. The upgraded detector showed an excellent performance during the 2006 data taking., Proceeding of the IPRD06 conference (Siena, Okt. 06)

Published
2006

12. Design and status of COMPASS FAST-RICH

Author

P. Abbon, M. Alekseev, H. Angerer, M. Apollonio, R. Birsa, P. Bordalo, F. Bradamante, A. Bressan, L. Busso, M. Chiosso, P. Ciliberti, M.L. Colantoni, S. Costa, S. Dalla Torre, E. Delagnes, H. Deschamps, V. Diaz, N. Dibiase, V. Duic, W. Eyrich, D. Faso, A. Ferrero, M. Finger, H. Fisher, S. Gerassimov, M. Giorgi, B. Gobbo, D. von Harrach, F.H. Heinsius, S. Horikawa, R. Joosten, B. Ketzer, K. Königsmann, I. Konorov, D. Kramer, F. Kunne, A. Lehmann, A. Maggiora, A. Magnon, A. Martin, G. Menon, A. Mutter, O. Nähle, D. Neyret, P. Pagano, S. Panebianco, D. Panzieri, S. Paul, J. Polak, P. Rebourgeard, P. Schiavon, C. Schill, W. Schröder, L. Silva, M. Slunecka, F. Sozzi, L. Steiger, M. Sulc, F. Tessarotto, A. Teufel, Abbon, P, Alekseev, M, Angerer, H, Apollonio, M, Birsa, R, Bordalo, P, Bradamante, F, Bressan, Andrea, Busso, L, Chiosso, M, Ciliberti, Piero, COLANTONI M., L, Costa, S, DALLA TORRE, S, Delagnes, E, Deschamps, H, Diaz, V, Dibiase, N, Duic, V, Eyrich, W, Faso, D, Ferrero, A, Finger, M, FINGER M., Jr, Fisher, H, Gerassimov, S, Giorgi, Marcello, Gobbo, B, VON HARRACH, D, HEINSIUS F., H, Horikawa, S, Joosten, R, Ketzer, B, Königsmann, K, Konorov, I, Kramer, D, Kunne, F, Lehmann, A, Maggiora, A, Magnon, A, Martin, Anna, Menon, G, Mutter, A, Nähle, O, Neyret, D, Pagano, P, Panebianco, S, Panzieri, D, Paul, S, Polak, J, Rebourgeard, P, Schiavon, Paolo, Schill, C, Schröder, W, Silva, L, Slunecka, M, Sozzi, F, Steiger, L, Sulc, M, Tessarotto, F, and Teufel, A.

Subjects
Physics, Nuclear and High Energy Physics, Photomultiplier, business.industry, Context (language use), Photodetection, Chip, Photocathode, Optics, Upgrade, Compass, Electronics, business, Instrumentation
Abstract

In the context of the upgrade of COMPASS RICH-1, we are developing a fast photodetection system for RICH counters, based on UV extended Multi-Anode PhotoMultiplier Tubes (MAPMT) and a custom, low dead-time electronic readout system. Photons are concentrated on the MAPMT photocathode by an optical system that preserves the position information. The ratio between the collection and the photosensitive surfaces is ∼7.5 in our design, larger than in previous applications. A new front-end electronics, based on a modified version of the MAD4 discriminator chip, is being realized to digitize the MAPMT signals. We report about the design of the photodetection system and of the associated electronic readout system, and on the preliminary test beam results.

Published
2006

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