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Ageing tests and recovery procedures of silica aerogel

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Title: Ageing tests and recovery procedures of silica aerogel
Authors: Perego, D.L.1 http://moby.mib.infn.it/~dperego/
Source: Nuclear Instruments & Methods in Physics Research Section A. Sep2008, Vol. 595 Issue 1, p224-227. 4p.
Subjects: Silicon compounds, Physics instruments, Engineering instruments, Particles (Nuclear physics)
Abstract: Abstract: Silica aerogel has been extensively used in RICH detectors for the identification of charged particles over the momentum range between 1 and . Tiles of hygroscopic aerogel with large transverse dimensions and refractive index have recently been produced for use in the LHCb experiment, allowing pion–kaon identification up to . The tiles have excellent optical properties (clarity factor better than and homogeneity within the tile). Extensive R&D tests on aerogel samples have been performed. Samples have been exposed to intense irradiation (proton, neutron and gamma), to humid air, to standard black varnish (used to paint the inner surface of RICH detectors), and to C4F10 and CO2 gases. The optical properties of the aerogel have been monitored during these tests and, when required, recovery procedures have been investigated and applied. In particular, regeneration of the tiles has been realized through exposure to dry atmosphere (gaseous N2) or through baking for several hours at . The measurements demonstrate that the optical properties have been successfully restored to their values at the production stage, and in no case permanent degradation has been observed. [Copyright &y& Elsevier]
Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 34464053
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Ageing tests and recovery procedures of silica aerogel
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  Data: <searchLink fieldCode="AR" term="%22Perego%2C+D%2EL%2E%22">Perego, D.L.</searchLink><relatesTo>1</relatesTo><i> http://moby.mib.infn.it/~dperego/</i>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Instruments+%26+Methods+in+Physics+Research+Section+A%22">Nuclear Instruments & Methods in Physics Research Section A</searchLink>. Sep2008, Vol. 595 Issue 1, p224-227. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Silicon+compounds%22">Silicon compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Physics+instruments%22">Physics instruments</searchLink><br /><searchLink fieldCode="DE" term="%22Engineering+instruments%22">Engineering instruments</searchLink><br /><searchLink fieldCode="DE" term="%22Particles+%28Nuclear+physics%29%22">Particles (Nuclear physics)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: Silica aerogel has been extensively used in RICH detectors for the identification of charged particles over the momentum range between 1 and . Tiles of hygroscopic aerogel with large transverse dimensions and refractive index have recently been produced for use in the LHCb experiment, allowing pion–kaon identification up to . The tiles have excellent optical properties (clarity factor better than and homogeneity within the tile). Extensive R&D tests on aerogel samples have been performed. Samples have been exposed to intense irradiation (proton, neutron and gamma), to humid air, to standard black varnish (used to paint the inner surface of RICH detectors), and to C4F10 and CO2 gases. The optical properties of the aerogel have been monitored during these tests and, when required, recovery procedures have been investigated and applied. In particular, regeneration of the tiles has been realized through exposure to dry atmosphere (gaseous N2) or through baking for several hours at . The measurements demonstrate that the optical properties have been successfully restored to their values at the production stage, and in no case permanent degradation has been observed. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.nima.2008.07.023
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      – SubjectFull: Silicon compounds
        Type: general
      – SubjectFull: Physics instruments
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      – SubjectFull: Engineering instruments
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      – SubjectFull: Particles (Nuclear physics)
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      – TitleFull: Ageing tests and recovery procedures of silica aerogel
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              Text: Sep2008
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