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Light output optimization for the Cherenkov strips of the Barrel detector of FOPI

Technical Report:

Abstract

Available as short communication only. A systematic study on how to increase the number of the photoelectrons (PE) in the phototubes at the end of the bent light guides has been undertaken prior to the final assembly of the Cherenkov strips of the Barrel detector for the 4{pi} facility FOPI at GSI-Darmstadt. This was motivated by the observation that with the mass-produced strips only 0.8 PE were found for cosmic rays incident at the center of the 240 cm long strips, a value too low to ensure a decent detection of even {beta}=1 particles. The method used was based on a careful calibration of the amplitude spectra by means of measuring single-electron peaks in the attached tubes. As the consequence of these studies the wave-length shifter (amino G salt) concentration in the distilled water of strips was optimized and a cell of 1000 mm with a mirror on one side has been used. These changes brought a improvement factor of 9 in the number of PE at 85 cm distance from the light guide. This results led to the decision of changing the former design of the Cherenkov layer. In addition during production of these final modules it has been  More>>
Authors:
Petrovici, M; Gobbi, A; Hildenbrand, K D; [1]  Kirejczyk, M; Sikora, B; [2]  Chelepov, V; Dulin, M; Frolov, S; Judentsov, A; Krylov, V; Nikitin, A; Smolyankin, V; Zhilin, A; [3]  Mgebrishvili, G; Vasiliev, M [4] 
  1. Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)
  2. Warsaw Univ. (Poland)
  3. Institute for Theoretical and Expermental Physics - ITEP, B. Chermushkinskaya ulitsa 25, RU-117 259 Moskva, (Russian Federation)
  4. I.V. Kurchatov Institute of Atomic Energy, Ulitsa Kurchatova 46, RU-123 182 Moskva, (Russian Federation)
Publication Date:
Dec 31, 1994
Product Type:
Technical Report
Report Number:
NP-84-1995
Reference Number:
SCA: 440101; PA: AIX-26:057214; EDB-95:106623; SN: 95001428215
Resource Relation:
Other Information: PBD: 1994; Related Information: Is Part Of Progress Report. Department of Heavy Ion Physics. 1992-1993; Grama, C.; Ionescu-Bujor, M.; Poenaru, D.; Pop, A. [ed.] [Institute of Atomic Physics, Information and Documentation Office, PO Box MG-6, R-76900 Bucharest, (Romania)]; PB: 94 p.
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; CHARGED PARTICLE DETECTION; CHERENKOV RADIATION; FOUR-PI COUNTING; LIGHT PIPES; MULTIPARTICLE SPECTROMETERS; NUCLEAR FRAGMENTATION; LIGHTING SYSTEMS; MULTIPLE PRODUCTION; MULTIPLICITY; OPTICAL SYSTEMS; OPTIMIZATION; PHOTOELECTRON SPECTROSCOPY; PROGRESS REPORT
OSTI ID:
77640
Research Organizations:
Institute of Atomic Physics, Bucharest (Romania). Inst. of Physics and Nuclear Engineering
Country of Origin:
Romania
Language:
English
Other Identifying Numbers:
TRN: RO9500282057214
Availability:
Available from Dumitriu M. Institute of Atomic Physics, Information and Documentation Office, PO Box MG-6, R-76900 Bucharest, (Romania)
Submitting Site:
INIS
Size:
pp. 57
Announcement Date:

Technical Report:

Citation Formats

Petrovici, M, Gobbi, A, Hildenbrand, K D, Kirejczyk, M, Sikora, B, Chelepov, V, Dulin, M, Frolov, S, Judentsov, A, Krylov, V, Nikitin, A, Smolyankin, V, Zhilin, A, Mgebrishvili, G, and Vasiliev, M. Light output optimization for the Cherenkov strips of the Barrel detector of FOPI. Romania: N. p., 1994. Web.
Petrovici, M, Gobbi, A, Hildenbrand, K D, Kirejczyk, M, Sikora, B, Chelepov, V, Dulin, M, Frolov, S, Judentsov, A, Krylov, V, Nikitin, A, Smolyankin, V, Zhilin, A, Mgebrishvili, G, & Vasiliev, M. Light output optimization for the Cherenkov strips of the Barrel detector of FOPI. Romania.
Petrovici, M, Gobbi, A, Hildenbrand, K D, Kirejczyk, M, Sikora, B, Chelepov, V, Dulin, M, Frolov, S, Judentsov, A, Krylov, V, Nikitin, A, Smolyankin, V, Zhilin, A, Mgebrishvili, G, and Vasiliev, M. 1994. "Light output optimization for the Cherenkov strips of the Barrel detector of FOPI." Romania.
@misc{etde_77640,
title = {Light output optimization for the Cherenkov strips of the Barrel detector of FOPI}
author = {Petrovici, M, Gobbi, A, Hildenbrand, K D, Kirejczyk, M, Sikora, B, Chelepov, V, Dulin, M, Frolov, S, Judentsov, A, Krylov, V, Nikitin, A, Smolyankin, V, Zhilin, A, Mgebrishvili, G, and Vasiliev, M}
abstractNote = {Available as short communication only. A systematic study on how to increase the number of the photoelectrons (PE) in the phototubes at the end of the bent light guides has been undertaken prior to the final assembly of the Cherenkov strips of the Barrel detector for the 4{pi} facility FOPI at GSI-Darmstadt. This was motivated by the observation that with the mass-produced strips only 0.8 PE were found for cosmic rays incident at the center of the 240 cm long strips, a value too low to ensure a decent detection of even {beta}=1 particles. The method used was based on a careful calibration of the amplitude spectra by means of measuring single-electron peaks in the attached tubes. As the consequence of these studies the wave-length shifter (amino G salt) concentration in the distilled water of strips was optimized and a cell of 1000 mm with a mirror on one side has been used. These changes brought a improvement factor of 9 in the number of PE at 85 cm distance from the light guide. This results led to the decision of changing the former design of the Cherenkov layer. In addition during production of these final modules it has been observed that variances between different strips in terms of the number of PE could be minimized by an outer polishing of the plexiglas cells. Finally, during mounting of the detectors the used phototubes were selected according to their performance in peak to valley ratio of the single electron peaks spectrum. (Author) 3 Figs., 2 Refs.}
place = {Romania}
year = {1994}
month = {Dec}
}