8 September 1995 Development of a multichannel fiber-to-fiber connector for the D-Zero upgrade tracker
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Abstract
A tracking detector using 2.5-m-long scintillating fibers is being developed for the D-Zero collaboration at Fermilab. The scintillating fibers will be coupled to 11-m-long clear fibers that will transport light to the photodetectors. We have developed connectors which couple the two types of fibers. The first 128-channel prototypes were machined using Delrin plastic to have v-shaped grooves that position fibers in the connector. Fibers were glued into the grooves and their ends were finished with diamond fly-cut tools. Mating connectors were optically coupled by General Electric optical grease. Using a green light-emitting diode and a silicon photodiode, we measured average light transmission between 97% and 99%. The transmissions were monitored for a period of nine months and were found to be stable over that period. We investigated two arrangements; one where the clear fiber was slightly larger than the scintillating fiber and the other where both were the same size. We found the percentages transmitted essentially the same in both cases. The later arrangement, however, would make the detector simpler to fabricate. We are also actively searching for a nonfluid optical couplant which will remain stable for many years during the expected life of the detector. Recently versions of the v-groove connectors were made of acrylonitrile-butadiene- styrene plastic by injection molding and were found, in the case of coupling equal diameter fibers, to have light transmissions between 94% and 96%.
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Seymour Margulies, Manho Chung, "Development of a multichannel fiber-to-fiber connector for the D-Zero upgrade tracker", Proc. SPIE 2551, Photoelectronic Detectors, Cameras, and Systems, (8 September 1995); doi: 10.1117/12.218630; https://doi.org/10.1117/12.218630
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