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An improved method for manufacturing accurate and cheap glass parabolic mirrors

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
0168-9002
Publisher
Elsevier
Publication Date
Volume
276
Issue
3
Identifiers
DOI: 10.1016/0168-9002(89)90574-3

Abstract

Abstract We have developed at CERN a cheap method for manufacturing accurate parabolic mirrors. These mirrors were needed for imaging to a ring the light generated by the Cherenkov radiation in the Ring Imaging Cherenkov detector (RICH) proposed by the DELPHI Experiment [1] at CERN. These mirrors are numerous (300). They are cut from a parabola 800 mm in diameter and have focal lengths ranging from 370 to 400 mm. The focal point needs to have a diameter smaller than 1.2 mm. They should have a good reflectivity in the UV region above 80% at 160 nm. A very good surface quality was required (an average roughness below 1 nm). In order to comply with these requirements and to produce these mirrors as cheaply as possible the conventional heat forming technique had to be thoroughly restudied and improved.

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