Production of 300 paraboloidal mirrors with high reflectivity for use in the Barrel RICH counter in DELPHI at LEP

https://doi.org/10.1016/0168-9002(89)90762-6Get rights and content

Abstract

Mirrors have been produced industrially by heat-forming 6 mm thick float-glass at about 610°C, followed by vacuum deposition of a 50 nm thick layer of Al and a 60 nm thick protective layer of MgF2, using a fabrication method first developed at CERN. The successful implementation of this method for industrial production, and the quality control of the mirrors, are described. An average reflectivity of more than 85% in the wavelength region 165–200 nm has been achieved in the production. The focal spot obtained by shining parallel light on the mirrors contained, on the average, 98% of the light within a circle of 1.2 mm diameter.

References (8)

  • P. Baillon

    Internal report CERN-DELPHI 82-21

    (Sept. 1982)
  • A detector with lepton, photon, and hadron identification

    DELPHI Technical Proposal

    DELPHI Progress Report

  • J. Séguinot et al.

    Nucl. Instr. and Meth.

    (1977)
  • T. EkelöfT. Ekelöf
There are more references available in the full text version of this article.

Cited by (24)

  • The VHMPID RICH upgrade project for ALICE at LHC

    2011, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Citation Excerpt :

    The mirror has a lightweight carbon-fiber substrate, a material which minimizes the material for traversing particles and is fluorocarbon-compatible, thus not degraded by C4F10 [13]. High reflectivity up to VUV is achieved by Al/MgF2 coating [14]. The Front-End electronics is based on the GASSIPLEX chip [15] allowing multiplexed analogue readout for centroid measurement.

  • Investigation of deposition parameters for VUV reflective coatings on the HADES RICH mirrors

    2004, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
  • VUV absorbing vapours in n-perfluorocarbons

    2003, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
  • The mirror system of COMPASS RICH-1

    2003, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
  • The radiator gas and the gas system of COMPASS RICH-1

    2003, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
  • COMPASS RICH-1

    2002, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
View all citing articles on Scopus
View full text