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Pregled bibliografske jedinice broj: 144503

Mechanisms affecting performance of the BaBar resistive plate chambers and searches for remediation


Anulli, F.; Bagnasco, S.; Baldini, R.; Band, H.R.; Bionta, R.; Brau, J.E.; Brigljević, Vuko; Buzzo, A.; Calcaterra, A.; Carpinelli, M. et al.
Mechanisms affecting performance of the BaBar resistive plate chambers and searches for remediation // Nuclear Instruments and Methods in Physics Research: Section A, 508 (2003), 128-132 (međunarodna recenzija, članak, znanstveni)


Naslov
Mechanisms affecting performance of the BaBar resistive plate chambers and searches for remediation

Autori
Anulli, F. ; Bagnasco, S. ; Baldini, R. ; Band, H.R. ; Bionta, R. ; Brau, J.E. ; Brigljević, Vuko ; Buzzo, A. ; Calcaterra, A. ; Carpinelli, M. ; Cartaro, T. ; Cavallo, N. ; Crosetti, G. ; de Sangro, R. ; De Nardo, G. ; Eichenbaum, A. ; Fabozzi, F. ; Falciai, D. ; Ferrarotto, F. ; Ferroni, F. ; Finocchiaro, G. ; Forti, F. ; Frey, R. ; Gatto, C. ; Grauges, E. ; Iwasaki, M. ; Johnson, J.R. ; Lange, D.J. ; Lau, Y.P. ; Lista, L. ; Lovetere, M. ; Lu, C. ; Macri, M. ; Moore, T.B. ; Morganti, S. ; Neri, N. ; Neal, H. ; Palano, A. ; Paoloni, E. ; Paolucci, P. ; Passaggio, S. ; Pastore, F. ; Patteri, P. ; Peruzzi, I. ; Piccolo, M. ; Piccolo, D. ; Piredda, G. ; Robutti, E. ; Santroni, A. ; Sciacca, C. ; Sinev, N.B. ; Strom, D. ; Soha, A. ; Tosi, S. ; Wright, D.M. ; Xie, Y. ; Zallo, A.

Izvornik
Nuclear Instruments and Methods in Physics Research: Section A (0168-9002) 508 (2003); 128-132

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
RPC; remediation; linseed oil stalagmite; polymerization;

Sažetak
The BaBar experiment at PEPII relies on the instrumentation of the flux return IFR) for both muon identification and KL detection. The active detector is composed of resistive plate chambers (RPCs) operated in streamer mode. Since the start of operation the RPCs have suffered persistent efficiency deterioration and dark current increase problems. The "autopsy" of bad BaBar RPCs revealed that in many cases uncured linseed oil droplets had formed on the inner surface of the Bakelite plates, leading to current paths from oil "stalagmites" bridging the 2 mm gap. In this paper, a possible model of this "stalagmite" formation and its effect on the dark current and efficiency of RPC chambers is presented. Laboratory test results strongly support this model. Based upon this model we are searching for solutions to eliminate the unfavorable effect of the oil stalagmites. The lab tests show that the stalagmite resistivity increases dramatically if exposed to the air, an observation that points to a possible way to remedy the damage and increase the efficiency. We have seen that flowing an oxygen gas mixture into the chamber helps to polymerize the uncured linseed oil. Consequently, the resistivity of the bridged oil stalagmites increases, as does that of the oil coating on the frame edges and spacers, significantly reducing the RPC dark currents and low-efficiency regions. We have tested this idea on two chambers removed from BaBar because of their low efficiency and high dark current. These test results are reported in the paper, and two other remediation methods also mentioned. We continue to study this problem, and try to find new treatments with permanent improvement.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Ustanove
Institut "Ruđer Bošković", Zagreb

Autor s matičnim brojem:
Vuko Brigljević, (259320)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus