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Titolo:
DEVELOPMENT OF LARGE-AREA FAST-RICH PROTOTYPES WITH PAD READOUT AND SOLID PHOTOCATHODES
Autore:
ALMEIDA J; BERGER H; BRAEM A; COLUZZA C; DIMAURO A; LJUBICIC A; NAPPI E; MARGARITONDO G; PAIC G; PIUZ F; POSA F; RIBEIRO R; SCOGNETTI T; WILLIAMS D;
Indirizzi:
RUDJER BOSKOVIC INST 41001 ZAGREB CROATIA RUDJER BOSKOVIC INST 41001 ZAGREB CROATIA CERN CH-1211 GENEVA 23 SWITZERLAND ECOLE POLYTECH FED LAUSANNE CH-1007 LAUSANNE SWITZERLAND INFN BARI ITALY POLITECN BARI BARI ITALY
Titolo Testata:
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
fascicolo: 2-3, volume: 348, anno: 1994,
pagine: 216 - 222
SICI:
0168-9002(1994)348:2-3<216:DOLFPW>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
10
Recensione:
Indirizzi per estratti:
Citazione:
J. Almeida et al., "DEVELOPMENT OF LARGE-AREA FAST-RICH PROTOTYPES WITH PAD READOUT AND SOLID PHOTOCATHODES", Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 348(2-3), 1994, pp. 216-222

Abstract

In the frame of the RD26 collaboration at CERN we have built and tested several prototypes of fast-RICH detectors suitable for the construction of large systems. The detectors used a solid photocathode consisting of a 500 nm CsI layer evaporated on a conventional pad readout board of a MWPC operated with a methane/isobutane mixture at atmospheric pressure. The results indicate that such a detector may be used for long periods of time in stable operating conditions provided the gas mixture is continuously flushed through the detector. Evidence is presented for a significant loss of transmission of Cherenkov photons in the NaF radiator due to internal anisotropy of the crystal. We present theresults of the performance of the photocathodes, the quantum efficiency of the CsI we have extracted from the measured Cherenkov photons and the identification achievable in a high density environment such as the detector ALICE planned for the heavy ion LHC. The results of a study of primary and secondary electron photoemission of CsI layers indicate that the surface structure and electron yield depend on the sourcematerial and on the heat treatment of the layer.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 09:52:53