Scintillating fiber ribbon --- tungsten calorimeter Page: 3 of 16
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1 Introduction
Experiment 774 at Fermilab is an electron beam-dump experiment that is
searching for neutral, short-lived particles that couple to the electron. The
sensitivity of such a search to short lifetimes is determined by the energy of
the beam and the length of the dump, in particular the shorter the dump,
the more sensitive the experiment. In order to minimize the length of the
dump, tungsten was chosen as the absorber and scintillating fiber ribbon as
the sampling medium.
A new scintillator [1] developed in the scintillating fiber program at Fer-
milab was used in the dump calorimeter. This scintillator was fabricated at
Fermilab and drawn into fiber ribbons commercially. [2]
2 Scintillation Fiber Ribbons
The scintillator used in the calorimeter consisted of a polystyrene base doped
with 2-(2’-Hydroxyphenyl)benzothiazole (HBT) at a concentration of 1 % by
weight. This molecule exhibits an intra-molecular proton transfer upon ex-
citation [3]; thus there is essentially no overlap between the emission and
absorption spectra of this compound, (Figure 1). Since this single dopant
couples directly to the intrinsic fluorescence of the polystyrene, we have re-
ferred to this type of scintillator as an intrinsic IPT scintillator. The light
yield from this scintillator is approximately 1/3 that of NE 110 and has a
decay time of 3-4 nsec.
Fibers were drawn from square preforms consisting of a core of HBT
1
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Bross, A.; Crisler, M.; Kross, B. & Wrbanek, J. Scintillating fiber ribbon --- tungsten calorimeter, report, July 14, 1989; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1093889/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.