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Proceedings Paper

Design and manufacture of imaging time-of-propagation optics
Author(s): Mike Albrecht; James Fast; Alan Schwartz
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Paper Abstract

There are several challenges associated with the design and manufacture of the optics required for the imaging time-of- propagation detector constructed for the Belle II particle physics experiment. This detector uses Cherenkov light radiated in quartz bars to identify subatomic particles: pions, kaons, and protons. The optics are physically large (125 cm x 45 cm x 2 cm bars and 45 cm x 10 cm x 5 cm prisms), all surfaces are optically polished, and there is very little allowance for chamfers or surface defects. In addition to the optical challenges, there are several logistical and handling challenges associated with measuring, assembling, cleaning, packaging, and shipping these delicate precision optics. This paper describes a collaborative effort between Pacific Northwest National Laboratory, the University of Cincinnati, and ZYGO Corporation for the design and manufacture of 48 fused silica optics (30 bars and 18 prisms) for the iTOP Detector. Details of the iTOP detector design that drove the challenging optical requirements are provided, along with material selection considerations. Since the optics are so large, precise, and delicate, special care had to be given to the selection of a manufacturing process capable of achieving the challenging optical and surface defect requirements on such large and high-aspect-ratio (66:1) components. A brief update on the current status and performance of these optics is also provided.

Paper Details

Date Published: 12 September 2016
PDF: 15 pages
Proc. SPIE 9969, Radiation Detectors: Systems and Applications XVII, 99690C (12 September 2016); doi: 10.1117/12.2238833
Show Author Affiliations
Mike Albrecht, Zygo Corp. (United States)
James Fast, Pacific Northwest National Lab. (United States)
Alan Schwartz, Univ. of Cincinnati (United States)


Published in SPIE Proceedings Vol. 9969:
Radiation Detectors: Systems and Applications XVII
Gary P. Grim; H. Bradford Barber; Lars R. Furenlid, Editor(s)

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