Interprocess and Interprocessor Data Flow in the Kloe Data Acquisition System

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The full-length prototype of the KLOE drift chamber

The main goal of the KLOE experiment is the study of CP violation in the K mesons system, with an accuracy of 10(-4) in the measurement of Re(epsilon'/epsilon). This task imposes strong constraints on the design and operation of the drift chamber, which must reconstruct the charged decays of low momentum K-L's and K-S's with high efficiency and high resolution, full-length prototype of the chamber has been built and tested on a 50 GeV/c beam. The analysis of the large sample of data has allowed a detailed study of the time to distance relations as a function of the track parameters and of the peculiar geometry of the drift cell, The detector performance, in terms of efficiency, spatial resolutions and dE/dx resolution, is illustrated and discussed

Data acquisition and monitoring for the KLOE detector

none77siThe Data Acquisition system for the KLOE experiment, presently running at the Laboratori Nazionali di Frascati DAPhiNE collider, has been designed to sustain an acquisition throughput of 50 Mbyte/s for an event rate of 10 kHz. its two major components are the front end data readout, based on custom buses, and a complex network of computers and storage devices hosting a set of distributed processes. The end result is a seamless data transport from the readout system to the storage library, accompanied by concurrent on line calibrations and data quality control.openA. ALOISIO; F. AMBROSINO; S. CAVALIERE; F. CEVENINI; C. DI DONATO; A. DORIA; D. FIORE; L. MEROLA; G. PIROZZI; G. SARACINO; M. ANTONELLI; F. BOSSI; P. CIAMBRONE; P. DE SIMONE; S. DELL'AGNELLO; M.L. FERRER; G. FINOCCHIARO; C. FORTI; C. GATTI; S. GIOVANNELLA; W. GRANDEGGER; G. LANFRANCHI; B. MARTINI; W. MEI; S. MISCETTI; M. MOULSON; F. MURTAS; M. PALUTAN; L. PASSALACQUA; F. PELUCCHI; P. SANTANGELO; B. SCIASCIA; I. SFILIGOI; J. SHAN; T. SPADARO; P. VALENTE; Y ZHOU; C. BINI; V. BOCCI; G. CABIBBO; R. CALOI; A. CARDINI; E. DE LUCIA; A. DI DOMENICO; P. GAUZZI; E. PASQUALUCCI; M. PASSASEO; D. PICCA; L. PONTECORVO; E. VALENTE; S. VENEZIANO; P. BRANCHINI; E. GRAZIANI; A. PASSERI; A. FERRARI; E. SPIRITI; C. STANESCU; L. TORTORA; M. CASARSA; G. CATALDI; E. GORINI; M. PRIMAVERA; A. VENTURA; G. DE ROBERTIS; P. GUARNACCIA; A. DENIG; CHEN-CHENG KUO; S. MULLER; B. VALERIANI; S. DI FALCO; M. INCAGLI; G. VENANZONI; R. MESSI; L. PACCIANI; E. SANTOVETTI; J. LEE-FRANZINI; M. MARTEMIANOVA., Aloisio; F., Ambrosino; S., Cavaliere; F., Cevenini; C., DI DONATO; A., Doria; D., Fiore; L., Merola; G., Pirozzi; G., Saracino; M., Antonelli; F., Bossi; P., Ciambrone; P., DE SIMONE; S., Dell'Agnello; M. L., Ferrer; G., Finocchiaro; C., Forti; C., Gatti; S., Giovannella; W., Grandegger; G., Lanfranchi; B., Martini; W., Mei; S., Miscetti; M., Moulson; F., Murtas; M., Palutan; L., Passalacqua; F., Pelucchi; P., Santangelo; B., Sciascia; I., Sfiligoi; J., Shan; T., Spadaro; P., Valente; Y., Zhou; C., Bini; V., Bocci; G., Cabibbo; R., Caloi; A., Cardini; E., DE LUCIA; A., DI DOMENICO; P., Gauzzi; E., Pasqualucci; M., Passaseo; D., Picca; L., Pontecorvo; E., Valente; S., Veneziano; P., Branchini; E., Graziani; A., Passeri; A., Ferrari; E., Spiriti; C., Stanescu; L., Tortora; M., Casarsa; G., Cataldi; Gorini, Edoardo; Primavera, Margherita; Ventura, Andrea; G., DE ROBERTIS; P., Guarnaccia; A., Denig; CHEN CHENG, Kuo; S., Muller; B., Valeriani; S., DI FALCO; M., Incagli; G., Venanzoni; R., Messi; L., Pacciani; E., Santovetti; J., LEE FRANZINI; M., Martemiano

INTERPROCESS AND INTERPROCESSOR DATA FLOW IN THE KLOE DATA ACQUISITION SYSTEM

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Myoninduzierte Reaktionen im KARMEN Neutrinodetektor

Das Ziel dieser Arbeit war die detaillierte Untersuchung myoninduzierter Reaktionen im KARMEN-Detektorsystem, die aber nicht nur Untergrund fuer den Neutrinonachweis darstellen. Durch die praezise Messung von Myoneinfang- und Zerfallsreaktionen kann eine Vielzahl von Detektoreigenschaften bestimmt und ueberprueft sowie mit entsprechenden Monte-Carlo-Berechnungen verglichen werden. Ausserdem konnten fuer den Myoneinfang am Kohlenstoff relevante Ergebnisse fuer die Struktur der schwachen hadronischen Stroeme abgeleitet werden. So konnte das Mynonladungsverhaeltnis durch eine Fit an das Zeitspektrum von Myonzerfaellen im KARMEN-Detektor zu R (#mu#"+/#mu#"-)=1.32#+-#0.05 bestimmt werden. Dies ermoeglichte die genau Bestimmung der Einfangrate #LAMBDA#_c von negativen Myonen an "1"2C: #LAMBDA#_c["1"2C(#mu#"+,#nu#_#mu#)"1"2B]=(6.86#+-#0.59).10"3s"-"1, die in guter Uebereinstimmung mit dem bisher besten experimentellen Wert von #LAMBDA#_c=(7.05#+-#0.27).10"3s"-"1 aus dem Jahr 1964 ist. Zum ersten Mal ueberhaupt konnte auch eine Myoneinfangrate fuer die seltene Reaktion #mu#"-+"1"3C#->#"1"2B+n+#nu#_#mu# angegeben werden: #LAMBDA#_c["1"3C(#mu#"-,#nu#_#mu#n)"1"2B]= (21.9#+-#3.9).10"3 s"-"1, die etwa 30% geringer ist als theoretisch erwartet. Durch die eingehende Untersuchung von myoninduzierten Untergrundereignissen konnten geeignete Reduktionsmassnahmen abgeleitet werden, die die Messung der 15.1 MeV #gamma#"-Quanten aus der neutralen Kernanregung "1"2C(#nu#,#nu#') "1"2C"* mit einem Signal-zu-Untergrundverhaeltnis von besser als 2:1 erlauben. Im Rahmen dieser Arbeit wurden Monte-Carlo-Simulationen mit GEANT3 sowohl fuer neutrino- als auch fuer myoninduzierte Reaktion in KARMEN-Detektor durchgefuehrt. Die gemessenen Energie- und Ortsverteilungen von myoniduzierten Ereignissen waren in guter Uebereinstimmung mit den berechneten. Die so verifizierten guten Detektoreigenschaften lassen zuverlaessige Resultate auch fuer die neutrionoinduzierten Reaktionen erwarten. (orig./HSI)This report deals with the detailed study of muon induced reactions in the KARMEN detector system. However such reactions are not only background for neutrino events: The precise measurement of muon capture and muon decay reactions allows to determine and test a variety of detector properties and efficiencies and to check corresponding Monte-Carlo simulations. Furthermore important results for the structure of weak hadronic currents could be deduced by measuring muon capture on carbon. The muon charge ratio was determined by fitting the time distribution of muon decays in the KARMEN detector: R(#mu#"+/#mu#"-)=1.32#+-#0.05. This allowed a precise determination of the capture rate of negative muons on "1"2C: #LAMBDA#_c["1"2C(#mu#"-,#nu#_#mu#)"1"2B]=(6.86#+-#0.59).10"3 s"-"1, which is in good agreement with the best experimental value of #LAMBDA#_c=(7.05#+-#0.27).10"3 s"-"1 measured in 1964. For the first time a capture rate for the rare process #mu#"-+"1"3C#->#"1"2B+n+#nu#_#mu# could be extracted: #LAMBDA#_c["1"3C(#mu#"-,#nu#_#mu#n)"1"2B]=(21.9#+-#3.9).10"3 s"-"1, which is about 30% lower than theoretically expected. Effective methods for background reduction have been deduced from the detailed study of muon induced background reactions which make it possible to observe the 15 MeV #gamma#-rays from the neutral neutrino nucleus excitation "1"2C(#nu#,#nu#')"1"2C"* with a signal-to-background ratio better than 2:1. Extended Monte-Carlo-Simulations with GEANT3 have been performed for neutrino and muon induced reactions in the KARMEN detector. The measured energy and spatial distributions of the muon induced reactions are in good agreement with the calculated ones thus verifying the good properties of the KARMEN detector. Therefore reliable results can also be expected for the neutrino induced reactions. (orig./HSI)Available from TIB Hannover: ZA 5141(5122) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman