THE RING IMAGING CHERENKOV DETECTORS OF DELPHI

none98A Ring Imaging Cherenkov (RICH) detector system has been built and is now in full operation within the DELPHI experiment. Large data samples of Z(O) decays are being collected with good resolution on the observed Cherenkov angles. Several studies of Z(O) decays using the RICH have already been performed on limited samples. Disturbance of the detector operation caused by shrinkage of polymeric construction materials and by migration of radiator substance is reported. These effects have been counteracted and do not endanger the quality of the data.W. ADAM;E. ALBERECHT;D. ALLEN;M. ANDRIEUX;G. VANAPELDOORN;Y. ARNOUD;C. AUBRET;A. AUGUSTINUS;P. BAILLON;M. BATTAGLIA;M. BERGGREN;D. BLOCH;O. BOTNER;C. BOURDARIOS;J. BRUNET;A. BUDZIAK;A. BUYS;P. CARECCHIO;P. CARRIE;P. CAVALLI;G. CERUTTI;M. CHEVRY;E. CHRISTOPHEL;E. DAHLJENSEN;G. DAMGAARD;N. DIMITRIOU;B. DALMAGNE;M. DAVENPORT;J. DOLBEAU;M. DRACOS;M. DRIS;T. EKELOF;J. ENGEL;D. FASSOULIOTIS;T. FILIPPAS;E. FOKITIS;F. FONTANELLI;A. FONTENILLE;D. FRAISSARD;H. FURSTENAU;J. GARCIA;E. GAZIS;D. GILLESPIE;V. GRACCO;L. GUGLIELMI;F. HAHN;S. HAIDER;A. HALLGREN;W. HAO;P. HONORE;K. HUET;S. ILIE;P. IOANNOU;P. JUILLOT;E. KARVELAS;S. KATSANEVAS;E. KATSOUFIS;N. KJAER;P. KLUIT;B. KOENE;C. KOURKOUMELIS;G. LECOEUR;G. LENZEN;L. LINDQVIST;A. AGUERA;D. LOUKAS;S. MALTEZOS;A. MARKOU;J. MEDBO;J. MICHALOWSKI;F. MONTANO;G. MOURGUE;B. NIELSEN;R. NICOLAIDOU;T. PAPADOPOULOU;A. PETROLINI;D. POUTOT;G. POLOK;H. RAHMANI;M. REALE;L. RESVANIS;G. SAJOT;M. SANNINO;E. SCHYNS;S. SQUARCIA;P. STASSI;R. STRUB;J. THADOME;G. THEODOSIOU;M. TOBAR;D. TOET;L. TRASPEDINI;G. TRIPODI;G. TRISTRAM;A. TSIROU;O. ULLALAND;A. DELAVEGA;M. ZAVRTANIKW., Adam; E., Alberecht; D., Allen; M., Andrieux; G., Vanapeldoorn; Y., Arnoud; C., Aubret; A., Augustinus; P., Baillon; M., Battaglia; M., Berggren; D., Bloch; O., Botner; C., Bourdarios; J., Brunet; A., Budziak; A., Buys; P., Carecchio; P., Carrie; P., Cavalli; G., Cerutti; M., Chevry; E., Christophel; E., Dahljensen; G., Damgaard; N., Dimitriou; B., Dalmagne; M., Davenport; J., Dolbeau; M., Dracos; M., Dris; T., Ekelof; J., Engel; D., Fassouliotis; T., Filippas; E., Fokitis; Fontanelli, Flavio; A., Fontenille; D., Fraissard; H., Furstenau; J., Garcia; E., Gazis; D., Gillespie; Gracco, Valerio; L., Guglielmi; F., Hahn; S., Haider; A., Hallgren; W., Hao; P., Honore; K., Huet; S., Ilie; P., Ioannou; P., Juillot; E., Karvelas; S., Katsanevas; E., Katsoufis; N., Kjaer; P., Kluit; B., Koene; C., Kourkoumelis; G., Lecoeur; G., Lenzen; L., Lindqvist; A., Aguera; D., Loukas; S., Maltezos; A., Markou; J., Medbo; J., Michalowski; F., Montano; G., Mourgue; B., Nielsen; R., Nicolaidou; T., Papadopoulou; Petrolini, Alessandro; D., Poutot; G., Polok; H., Rahmani; M., Reale; L., Resvanis; G., Sajot; Sannino, Mario; E., Schyns; Squarcia, Sandro; P., Stassi; R., Strub; J., Thadome; G., Theodosiou; M., Tobar; D., Toet; L., Traspedini; G., Tripodi; G., Tristram; A., Tsirou; O., Ullaland; A., Delavega; M., Zavrtani

OPERATIONAL EXPERIENCE WITH THE 4-PI RING IMAGING CHERENKOV DETECTOR OF DELPHI

The ring imaging Cherenkov detector in the DELPHI Experiment at LEP allows hadron identification over a momentum range up to about 40 Gev/c over a near to 4 pi solid angle. Photons emitted by charged particles traversing gas and liquid radiators which are filled with UV-transparent perfluorocarbons, are used for Cherenkov angle reconstruction. Stable operation ensures that the detector is an efficient and powerful instrument. Monitoring of the detector parameters is of utmost importance to achieve good data quality and adequate data processing. The hadron identifying power of the ring imaging Cherenkov detector closely meets the main design values. Computerized control and monitoring features of the different subsystems will be presented. The interplay between detector parameters and the particle separating capacity of the detector will be discussed

Operational experience with the 4π ring imaging Cherenkov detector of DELPHI

none104The ring imaging Cherenkov detector in the DELPHI Experiment at LEP allows hadron identification over a momentum range up to about 40 Gev/c over a near to 4 pi solid angle. Photons emitted by charged particles traversing gas and liquid radiators which are filled with UV-transparent perfluorocarbons, are used for Cherenkov angle reconstruction. Stable operation ensures that the detector is an efficient and powerful instrument. Monitoring of the detector parameters is of utmost importance to achieve good data quality and adequate data processing. The hadron identifying power of the ring imaging Cherenkov detector closely meets the main design values. Computerized control and monitoring features of the different subsystems will be presented. The interplay between detector parameters and the particle separating capacity of the detector will be discussed.W. ADAM;E. ALBRECHT;D. ALLEN;M. ANDRIEUX;G. VANAPELDOORN;Y. ARNOUD;C. AUBRET;A. AUGUSTINUS;P. BAILLON;M. BATTAGLIA;M. BERGGREN;D. BLOCH;O. BOTNER;C. BOURDARIOS;J. BRUNET;A. BUDZIAK;A. BUYS;P. CARECCHIO;P. CARRIE;P. CAVALLI;G. GERUTTI;M. CHEVRY;E. CHRISTOPHEL;E. DAHLJENSEN;G. DAMGAARD;N. DIMITRIOU;B. DALMAGNE;M. DAVENPORT;J. DOLBEAU;M. DRACOS;M. DRIS;L. EEK;T. EKELOF;J. ENGEL;D. FASSOULIOTIS;T. FILIPPAS;E. FOKITIS;F. FONTANELLI;A. FONTENILLE;D. FRAISSARD;F. FULDA;H. FURSTENAU;J. GARCIA;E. GAZIS;D. GILLESPIE;V. GRACCO;L. GUGLIELMI;F. HAHN;S. HAIDER;A. HALLGREN;W. HAO;T. HENKES;P. HONORE;K. HUET;S. ILIE;P. IOANNOU;P. JUILLOT;E. KARVELAS;S. KATSANEVAS;E. KATSOUFIS;N. KJAER;P. KLUIT;B. KOENE;C. KOURKOUMELIS;G. LECOEUR;G. LENZEN;L. LINDQVIST;A. AGUERA;D. LOUKAS;A. MALTEZOS;S. MALTEZOS;A. MARKOU;J. MEDBO;J. MICHALOWSKI;F. MONTANO;G. MOURGUE;B. NIELSEN;R. NICOLAIDOU;J. OSTLER;T. PAPADOPOULOU;A. PETROLINI;G. POLOK;D. POUTOT;H. RAHMANI;M. REALE;L. RESVANIS;G. SAJOT;M. SANNINO;E. SARAGAS;E. SCHYNS;S. SQUARCIA;P. STASSI;R. STRUB;J. THADOME;G. THEODOSIOU;D. TOET;L. TRASPEDINI;G. TRIPODI;G. TRISTRAM;A. TSIROU;O. ULLALAND;A. DELAVEGA;M. ZAVRTANIK;E. ZEVGOLATAKOSW., Adam; E., Albrecht; D., Allen; M., Andrieux; G., Vanapeldoorn; Y., Arnoud; C., Aubret; A., Augustinus; P., Baillon; M., Battaglia; M., Berggren; D., Bloch; O., Botner; C., Bourdarios; J., Brunet; A., Budziak; A., Buys; P., Carecchio; P., Carrie; P., Cavalli; G., Gerutti; M., Chevry; E., Christophel; E., Dahljensen; G., Damgaard; N., Dimitriou; B., Dalmagne; M., Davenport; J., Dolbeau; M., Dracos; M., Dris; L., Eek; T., Ekelof; J., Engel; D., Fassouliotis; T., Filippas; E., Fokitis; Fontanelli, Flavio; A., Fontenille; D., Fraissard; F., Fulda; H., Furstenau; J., Garcia; E., Gazis; D., Gillespie; Gracco, Valerio; L., Guglielmi; F., Hahn; S., Haider; A., Hallgren; W., Hao; T., Henkes; P., Honore; K., Huet; S., Ilie; P., Ioannou; P., Juillot; E., Karvelas; S., Katsanevas; E., Katsoufis; N., Kjaer; P., Kluit; B., Koene; C., Kourkoumelis; G., Lecoeur; G., Lenzen; L., Lindqvist; A., Aguera; D., Loukas; A., Maltezos; S., Maltezos; A., Markou; J., Medbo; J., Michalowski; F., Montano; G., Mourgue; B., Nielsen; R., Nicolaidou; J., Ostler; T., Papadopoulou; Petrolini, Alessandro; G., Polok; D., Poutot; H., Rahmani; M., Reale; L., Resvanis; G., Sajot; Sannino, Mario; E., Saragas; E., Schyns; Squarcia, Sandro; P., Stassi; R., Strub; J., Thadome; G., Theodosiou; D., Toet; L., Traspedini; G., Tripodi; G., Tristram; A., Tsirou; O., Ullaland; A., Delavega; M., Zavrtanik; E., Zevgolatako

THE RING IMAGING CHERENKOV DETECTOR OF DELPHI

The ring imaging Cherenkov detector system in the DELPHI experiment at the Large Electron-Positron storage ring at CERN, is designed to do particle identification over most of the solid angle in the momentum range from approximately 2 GeV/c to approximately 40 GeV/c. Two radiator media are used to cover the momentum range; (i) a 1 cm layer of liquid C6F14, and (ii) a volume filled with gaseous C5F12 or C4F10. Photosensitive time projection chambers record the conversion points of the ultraviolet photons produced in both radiator systems. The total active area is approximately 30 m2 in the barrel region and approximately 8 m2 in the two endcaps. The design of the detector systems is described in this paper. We will also report performance figures and compare them to simulation studies