The chimney end of the fibers is the most downstream end (away from fuse, near rubber band identifiers) where the fiber is inserted in a "chimney" used to hold it in place above a silicon photomultiplier for light collection. The chimneys have a maximum width requirement of 2.03mm. One hundred and twelve fibers, shown in [https://docs.google.com/spreadsheets/d/1nNwGV8ktyOAOx1IHW56j6FE3KqDbFEpy6meRJBFwvFY/edit#gid=0 this] spreadsheet, have had their chimney ends measured as a part of an effort to produce bundles with a number of ideal dimensions for easy microscope installation. Of the one hundred and twelve, five fibers were found to have chimney ends that are too big.
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The chimney end of the fibers is the most downstream end (away from fuse, near rubber band identifiers) where the fiber is inserted in a "chimney" used to hold it in place above a silicon photomultiplier for light collection. The chimneys have a maximum width requirement of 2.03mm. One hundred and twelve fibers, shown in [https://docs.google.com/spreadsheets/d/1nNwGV8ktyOAOx1IHW56j6FE3KqDbFEpy6meRJBFwvFY/edit#gid=0 this] spreadsheet, have had their chimney ends measured as a part of an effort to produce bundles with a number of ideal dimensions for easy microscope installation. Of the one hundred and twelve measured, five fibers were found to have chimney ends that are too big. If it is assumed these fibers are a representative sample of all three hundred and sixty fibers, it is expected that a total of about fifteen fibers have chimney ends that are too long.